Spring REST 服务：从请求中检索 JSON

Question

我正在 Spring 3.1 上构建 REST 服务。我为此使用@EnableWebMVC 注释。由于我的服务将只接受 JSON 请求，我还想将传入的请求转储到 MongoDB 集合中以进行日志记录（以及稍后用于数据转换）。我想访问原始 JSON 请求（我可以在非弹簧实现上使用“@Content HttpServletRequest 请求”作为方法参数）。

我是春季新手。所以，请帮助我实现这一目标。谢谢！

更新：问题尚未完全解决。只有我的 GET 测试有效。 POST 失败。因此未选中接受的答案

问题是，即使我创建了一个 HttpServletRequestWrapper，我也无法在处理和包装请求后转发请求。这是发生了什么：

拦截器：

public class DBLogInterceptor extends HandlerInterceptorAdapter {
    MyRequestWrapper requestWrapper;

    private final static Logger logger = Logger.getLogger(DBLogInterceptor.class);

    @Override
    public boolean preHandle(
            HttpServletRequest request,
            HttpServletResponse response,
            Object handler) throws Exception 
    {
        requestWrapper = new MyRequestWrapper(request);
        // Code removed, but it just dumps requestWrapper.getBody() into DB
        return super.preHandle(requestWrapper, response, handler);
    }
}

HTTP POST 服务方式

@RequestMapping(method = RequestMethod.POST, consumes="application/json", produces="application/json", value = "employee")
@ResponseBody
public String updateEntity(@RequestBody Employee emp) {
    // Do some DB Stuff. Anyway, the control flow does not reach this place.
    return "Employee " + emp.getName() + " updated successfully!";
}

现在每当我发送 POST 时都会出现异常：

12:04:53,821 DEBUG DBLogInterceptor:22 - {"name":"Van Damme","dept":"Applied Martial Arts"}
12:04:53,843 DEBUG RequestResponseBodyMethodProcessor:117 - Reading [com.test.webapp.login.domain.Employee] as "application/json" using [org.springframework.http.converter.json.MappingJacksonHttpMessageConverter@154174f9]
12:04:53,850 DEBUG ExceptionHandlerExceptionResolver:132 - Resolving exception from handler [public java.lang.String com.test.webapp.controller.EmployeeService.updateEntity(com.test.webapp.login.domain.Employee)]: java.io.IOException: Stream closed
12:04:53,854 DEBUG ResponseStatusExceptionResolver:132 - Resolving exception from handler [public java.lang.String com.test.webapp.controller.EmployeeService.updateEntity(com.test.webapp.login.domain.Employee)]: java.io.IOException: Streamclosed
12:04:53,854 DEBUG DefaultHandlerExceptionResolver:132 - Resolving exception from handler [public java.lang.String com.test.webapp.controller.EmployeeService.updateEntity(com.test.webapp.login.domain.Employee)]: java.io.IOException: Streamclosed
12:04:53,859 DEBUG DispatcherServlet:910 - Could not complete request
java.io.IOException: Stream closed
        at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:312)
        at org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:200)
        at org.codehaus.jackson.impl.ByteSourceBootstrapper.ensureLoaded(ByteSourceBootstrapper.java:507)
        at org.codehaus.jackson.impl.ByteSourceBootstrapper.detectEncoding(ByteSourceBootstrapper.java:129)
        at org.codehaus.jackson.impl.ByteSourceBootstrapper.constructParser(ByteSourceBootstrapper.java:224)
        at org.codehaus.jackson.JsonFactory._createJsonParser(JsonFactory.java:785)
        at org.codehaus.jackson.JsonFactory.createJsonParser(JsonFactory.java:561)
        at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1914)
        at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.readInternal(MappingJacksonHttpMessageConverter.java:124)
        at org.springframework.http.converter.AbstractHttpMessageConverter.read(AbstractHttpMessageConverter.java:153)
        at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:120)
        at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:91)
        at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:71)
        at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:75)
        at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:156)
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:117)
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
        at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)

我希望HttpServletRequestWrapper 负责缓存请求。但它不会以某种方式发生。

Answer 1

使用HttpServletRequest 对象，您可以访问客户端用于发出请求的 URL、使用的方法（GET、POST、PUT 等）、查询字符串和标头。

获取 RequestBody 可能有点棘手，可能需要使用 HttpServletRequestWrapper 对象。由于请求正文只能读取一次，因此您需要扩展包装器以访问它，以便您的目标控制器稍后仍可以访问它以将您的 JSON 反序列化为 POJO 对象。

public class MyRequestWrapper extends HttpServletRequestWrapper {
 private final String body;
 public MyRequestWrapper(HttpServletRequest request) throws IOException {
   super(request);
   StringBuilder stringBuilder = new StringBuilder();
   BufferedReader bufferedReader = null;
   try {
     InputStream inputStream = request.getInputStream();
     if (inputStream != null) {
       bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
       char[] charBuffer = new char[128];
       int bytesRead = -1;
       while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
         stringBuilder.append(charBuffer, 0, bytesRead);
       }
     } else {
       stringBuilder.append("");
     }
   } catch (IOException ex) {
       throw ex;
   } finally {
     if (bufferedReader != null) {
       try {
         bufferedReader.close();
       } catch (IOException ex) {
         throw ex;
       }
     }
   }
   body = stringBuilder.toString();
 }

 @Override
 public ServletInputStream getInputStream() throws IOException {
   final ByteArrayInputStream byteArrayInputStream = new     ByteArrayInputStream(body.getBytes());
   ServletInputStream servletInputStream = new ServletInputStream() {
     public int read() throws IOException {
       return byteArrayInputStream.read();
     }
   };
   return servletInputStream;
 }

 @Override
 public BufferedReader getReader() throws IOException {
   return new BufferedReader(new InputStreamReader(this.getInputStream()));
 }

 public String getBody() {
   return this.body;
 }
}

要在中心位置访问请求，您可以使用过滤器或 Spring 拦截器。这两者都是在将请求委托给控制器之前调用的，并且都可以访问 servlet。

这是actual Logging example using a Spring Interceptor：

package com.vaannila.interceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Logger;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler. HandlerInterceptorAdapter;

public class LoggerInterceptor extends HandlerInterceptorAdapter {
    static Logger logger = Logger.getLogger(LoggerInterceptor.class);

    static {
        BasicConfigurator.configure();
    }

    @Override

    public boolean preHandle(HttpServletRequest request,
        HttpServletResponse response, Object handler) throws Exception {

        logger.info("Before handling the request");
        return super.preHandle(request, response, handler);
    }

    @Override
    public void postHandle(HttpServletRequest request,
        HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {

        logger.info("After handling the request");
        super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request,
        HttpServletResponse response, Object handler, Exception ex)
            throws Exception {

        logger.info("After rendering the view");
        super.afterCompletion(request, response, handler, ex);
    }
}


<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="viewResolver" class="org.springframework.web.servlet.view.    InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />

    <bean id="handlerMapping" class="org.springframework.web.servlet.handler. BeanNameUrlHandlerMapping" p:interceptors-ref="loggerInterceptor" />

    <bean id="loggerInterceptor" class="com.vaannila.interceptor.LoggerInterceptor" />

    <bean id="userService" class="com.vaannila.service.UserServiceImpl" />

    <bean name="/userRegistration.htm" class="com.vaannila.web.UserController" p:userService-ref="userService" p:formView="userForm" p:successView="userSuccess" />

</beans>

在 LoggerInterceptor 中，您可以使用以下代码来访问请求：

MyRequestWrapper myRequestWrapper = new MyRequestWrapper((HttpServletRequest) request);

String body = myRequestWrapper.getBody();
String clientIP = myRequestWrapper.getRemoteHost();
int clientPort = request.getRemotePort();
String uri = myRequestWrapper.getRequestURI();

System.out.println(body);
System.out.println(clientIP);
System.out.println(clientPort);
System.out.println(uri);

Answer 2

我怀疑HttpServletRequestWrapper 是否可以工作...看看 DispatcherServlet 实现：

            HandlerInterceptor[] interceptors = mappedHandler.getInterceptors();
            if (interceptors != null) {
                for (int i = 0; i < interceptors.length; i++) {
                    HandlerInterceptor interceptor = interceptors[i];
                    if (!interceptor.preHandle(processedRequest, response, mappedHandler.getHandler())) {
                        triggerAfterCompletion(mappedHandler, interceptorIndex, processedRequest, response, null);
                        return;
                    }
                    interceptorIndex = i;
                }
            }

            // Actually invoke the handler.
            mv = ha.handle(processedRequest, response, mappedHandler.getHandler());

它仍然传递对“processedRequest”的引用，它引用了一个流已被读取的HttpServletRequest请求。

Answer 3

我知道这是一个老问题，但对于那些仍在寻找解决方案的人来说，这对我有用：

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.output.TeeOutputStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HttpLoggingFilter implements Filter {

    private static final Logger logger = LoggerFactory.getLogger(HttpLoggingFilter.class);

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        try {
            HttpServletRequest httpServletRequest = (HttpServletRequest) request;
            HttpServletResponse httpServletResponse = (HttpServletResponse) response;

            Map<String, String> requestMap = this
                    .getTypesafeRequestMap(httpServletRequest);
            BufferedRequestWrapper bufferedRequest = new BufferedRequestWrapper(
                    httpServletRequest);
            BufferedResponseWrapper bufferedResponse = new BufferedResponseWrapper(
                    httpServletResponse);

            final StringBuilder logMessage = new StringBuilder(
                    "REST Request - ").append("[HTTP METHOD:")
                    .append(httpServletRequest.getMethod())
                    .append("] [PATH INFO:")
                    .append(httpServletRequest.getPathInfo())
                    .append("] [REQUEST PARAMETERS:").append(requestMap)
                    .append("] [REQUEST BODY:")
                    .append(bufferedRequest.getRequestBody())
                    .append("] [REMOTE ADDRESS:")
                    .append(httpServletRequest.getRemoteAddr()).append("]");

            chain.doFilter(bufferedRequest, bufferedResponse);
            logMessage.append(" [RESPONSE:")
                    .append(bufferedResponse.getContent()).append("]");
            logger.debug(logMessage.toString());
        } catch (Throwable a) {
            logger.error(a.getMessage());
        }
    }

    private Map<String, String> getTypesafeRequestMap(HttpServletRequest request) {
        Map<String, String> typesafeRequestMap = new HashMap<String, String>();
        Enumeration<?> requestParamNames = request.getParameterNames();
        while (requestParamNames.hasMoreElements()) {
            String requestParamName = (String) requestParamNames.nextElement();
            String requestParamValue = request.getParameter(requestParamName);
            typesafeRequestMap.put(requestParamName, requestParamValue);
        }
        return typesafeRequestMap;
    }

    @Override
    public void destroy() {
    }

    private static final class BufferedRequestWrapper extends
            HttpServletRequestWrapper {

        private ByteArrayInputStream bais = null;
        private ByteArrayOutputStream baos = null;
        private BufferedServletInputStream bsis = null;
        private byte[] buffer = null;

        public BufferedRequestWrapper(HttpServletRequest req)
                throws IOException {
            super(req);
            // Read InputStream and store its content in a buffer.
            InputStream is = req.getInputStream();
            this.baos = new ByteArrayOutputStream();
            byte buf[] = new byte[1024];
            int read;
            while ((read = is.read(buf)) > 0) {
                this.baos.write(buf, 0, read);
            }
            this.buffer = this.baos.toByteArray();
        }

        @Override
        public ServletInputStream getInputStream() {
            this.bais = new ByteArrayInputStream(this.buffer);
            this.bsis = new BufferedServletInputStream(this.bais);
            return this.bsis;
        }

        String getRequestBody() throws IOException {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    this.getInputStream()));
            String line = null;
            StringBuilder inputBuffer = new StringBuilder();
            do {
                line = reader.readLine();
                if (null != line) {
                    inputBuffer.append(line.trim());
                }
            } while (line != null);
            reader.close();
            return inputBuffer.toString().trim();
        }

    }

    private static final class BufferedServletInputStream extends
            ServletInputStream {

        private ByteArrayInputStream bais;

        public BufferedServletInputStream(ByteArrayInputStream bais) {
            this.bais = bais;
        }

        @Override
        public int available() {
            return this.bais.available();
        }

        @Override
        public int read() {
            return this.bais.read();
        }

        @Override
        public int read(byte[] buf, int off, int len) {
            return this.bais.read(buf, off, len);
        }

    }

    public class TeeServletOutputStream extends ServletOutputStream {

        private final TeeOutputStream targetStream;

        public TeeServletOutputStream(OutputStream one, OutputStream two) {
            targetStream = new TeeOutputStream(one, two);
        }

        @Override
        public void write(int arg0) throws IOException {
            this.targetStream.write(arg0);
        }

        public void flush() throws IOException {
            super.flush();
            this.targetStream.flush();
        }

        public void close() throws IOException {
            super.close();
            this.targetStream.close();
        }
    }

    public class BufferedResponseWrapper implements HttpServletResponse {

        HttpServletResponse original;
        TeeServletOutputStream tee;
        ByteArrayOutputStream bos;

        public BufferedResponseWrapper(HttpServletResponse response) {
            original = response;
        }

        public String getContent() {
            return bos.toString();
        }

        public PrintWriter getWriter() throws IOException {
            return original.getWriter();
        }

        public ServletOutputStream getOutputStream() throws IOException {
            if (tee == null) {
                bos = new ByteArrayOutputStream();
                tee = new TeeServletOutputStream(original.getOutputStream(),
                        bos);
            }
            return tee;

        }

        @Override
        public String getCharacterEncoding() {
            return original.getCharacterEncoding();
        }

        @Override
        public String getContentType() {
            return original.getContentType();
        }

        @Override
        public void setCharacterEncoding(String charset) {
            original.setCharacterEncoding(charset);
        }

        @Override
        public void setContentLength(int len) {
            original.setContentLength(len);
        }

        @Override
        public void setContentType(String type) {
            original.setContentType(type);
        }

        @Override
        public void setBufferSize(int size) {
            original.setBufferSize(size);
        }

        @Override
        public int getBufferSize() {
            return original.getBufferSize();
        }

        @Override
        public void flushBuffer() throws IOException {
            tee.flush();
        }

        @Override
        public void resetBuffer() {
            original.resetBuffer();
        }

        @Override
        public boolean isCommitted() {
            return original.isCommitted();
        }

        @Override
        public void reset() {
            original.reset();
        }

        @Override
        public void setLocale(Locale loc) {
            original.setLocale(loc);
        }

        @Override
        public Locale getLocale() {
            return original.getLocale();
        }

        @Override
        public void addCookie(Cookie cookie) {
            original.addCookie(cookie);
        }

        @Override
        public boolean containsHeader(String name) {
            return original.containsHeader(name);
        }

        @Override
        public String encodeURL(String url) {
            return original.encodeURL(url);
        }

        @Override
        public String encodeRedirectURL(String url) {
            return original.encodeRedirectURL(url);
        }

        @SuppressWarnings("deprecation")
        @Override
        public String encodeUrl(String url) {
            return original.encodeUrl(url);
        }

        @SuppressWarnings("deprecation")
        @Override
        public String encodeRedirectUrl(String url) {
            return original.encodeRedirectUrl(url);
        }

        @Override
        public void sendError(int sc, String msg) throws IOException {
            original.sendError(sc, msg);
        }

        @Override
        public void sendError(int sc) throws IOException {
            original.sendError(sc);
        }

        @Override
        public void sendRedirect(String location) throws IOException {
            original.sendRedirect(location);
        }

        @Override
        public void setDateHeader(String name, long date) {
            original.setDateHeader(name, date);
        }

        @Override
        public void addDateHeader(String name, long date) {
            original.addDateHeader(name, date);
        }

        @Override
        public void setHeader(String name, String value) {
            original.setHeader(name, value);
        }

        @Override
        public void addHeader(String name, String value) {
            original.addHeader(name, value);
        }

        @Override
        public void setIntHeader(String name, int value) {
            original.setIntHeader(name, value);
        }

        @Override
        public void addIntHeader(String name, int value) {
            original.addIntHeader(name, value);
        }

        @Override
        public void setStatus(int sc) {
            original.setStatus(sc);
        }

        @SuppressWarnings("deprecation")
        @Override
        public void setStatus(int sc, String sm) {
            original.setStatus(sc, sm);
        }

        @Override
        public String getHeader(String arg0) {
            return original.getHeader(arg0);
        }

        @Override
        public Collection<String> getHeaderNames() {
            return original.getHeaderNames();
        }

        @Override
        public Collection<String> getHeaders(String arg0) {
            return original.getHeaders(arg0);
        }

        @Override
        public int getStatus() {
            return original.getStatus();
        }

    }
}

然后只需在 web.xml 中注册过滤器即可。所有感谢：http://wetfeetblog.com/servlet-filer-to-log-request-and-response-details-and-payload/431（我只是做了一些小修复）。

Answer 4

嘿，你能试试这个吗：

@RequestMapping(method = RequestMethod.POST, consumes="application/json", produces="application/json", value = "/employee")
@ResponseBody
public String updateEntity(@RequestBody Employee emp) {
    // Do some DB Stuff. Anyway, the control flow does not reach this place.
    return "Employee " + emp.getName() + " updated successfully!";
}

这里：如果您使用“/”证明 URI，它允许执行所有操作。例如使用相同的 URI 值获取更新和删除。

Answer 5

目前在 spring-mvc repo 中，拦截器在 DispatcherServlet#doDispatch(...) 中被调用：

https://github.com/spring-projects/spring-framework/blob/master/spring-webmvc/src/main/java/org/springframework/web/servlet/DispatcherServlet.java

...
        if (!mappedHandler.applyPreHandle(processedRequest, response)) {
            return;
        }

        try {
            // Actually invoke the handler.
            mv = ha.handle(processedRequest, response, mappedHandler.getHandler());
        }
        finally {
            if (asyncManager.isConcurrentHandlingStarted()) {
                return;
            }
        }

        applyDefaultViewName(request, mv);
        mappedHandler.applyPostHandle(processedRequest, response, mv);
...

我可以定义自己的DispatcherServlet，并覆盖doDispatch(...) 以在getInputStream() 上注入带有ByteArrayInputStream 的HttpRequestWrapper？

...

@Override
    protected void doDispatch(HttpServletRequest request, HttpServletResponse response)
            throws Exception {

        RequestWrapper wrappedRequest = new RequestWrapper(request);
        logger.debug("injecting RequestWrapper: " + wrappedRequest);

        super.doDispatch(wrappedRequest, response);

    }
...

这适用于上述情况吗？

Answer 6

我制作了一个不依赖于 3rd 方库的 Ouputstream 版本，以便于重用。您可以使用这 2 个包装类轻松获取请求和响应正文。
但无论如何，我必须使用过滤器而不是拦截器来执行此操作。因为正如@user1323865 提到的，在spring 4 中，processedRequest 用于拦截器和处理程序，因此您不能将这些方法用于拦截器。
如果您使用的是 Writer 版本，也可以在此链接中找到一些帮助。 Capture and log the response body

public class BufferedRequestWrapper extends HttpServletRequestWrapper
{
    private static final class BufferedServletInputStream extends ServletInputStream
    {
        private ByteArrayInputStream bais;

        public BufferedServletInputStream(ByteArrayInputStream bais)
        {
            this.bais = bais;
        }

        @Override
        public int available()
        {
            return this.bais.available();
        }

        @Override
        public int read()
        {
            return this.bais.read();
        }

        @Override
        public int read(byte[] buf, int off, int len)
        {
            return this.bais.read(buf, off, len);
        }

    }

    private byte[] mBodyBuffer;

    public BufferedRequestWrapper(HttpServletRequest request) throws IOException
    {
        super(request);

        InputStream in = request.getInputStream();

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int bytesRead = -1;
        while ((bytesRead = in.read(buffer)) > 0)
        {
            baos.write(buffer, 0, bytesRead);
        }
        mBodyBuffer = baos.toByteArray();
    }

    public String getRequestBody()
    {
        return new String(mBodyBuffer, Charset.forName("UTF-8"));
    }
    @Override
    public BufferedReader getReader() throws IOException
    {
        return new BufferedReader(new InputStreamReader(this.getInputStream()));
    }

    @Override
    public ServletInputStream getInputStream()
    {
        ByteArrayInputStream in = new ByteArrayInputStream(mBodyBuffer);
        return new BufferedServletInputStream(in);
    }
}


public class BufferedResponseWrapper extends HttpServletResponseWrapper
{
    private TeeServletOutputStream mTeeOutputStream;

    private static class TeeOutputStream extends OutputStream
    {
        private OutputStream mChainStream;
        private OutputStream mTeeStream;

        public TeeOutputStream(OutputStream chainStream, OutputStream teeStream)
        {
            mChainStream = chainStream;
            mTeeStream = teeStream;
        }

        @Override
        public void write(int b) throws IOException
        {
            mChainStream.write(b);
            mTeeStream.write(b);
            mTeeStream.flush();
        }

        @Override
        public void close() throws IOException
        {
            flush();
            mChainStream.close();
            mTeeStream.close();
        }

        @Override
        public void flush() throws IOException
        {
            mChainStream.close();
        }
    }

    public class TeeServletOutputStream extends ServletOutputStream
    {
        private final TeeOutputStream targetStream;

        public TeeServletOutputStream(OutputStream one, OutputStream two)
        {
            targetStream = new TeeOutputStream(one, two);
        }

        @Override
        public void write(int b) throws IOException
        {
            this.targetStream.write(b);
        }

        @Override
        public void flush() throws IOException
        {
            super.flush();
            this.targetStream.flush();
        }

        @Override
        public void close() throws IOException
        {
            super.close();
            this.targetStream.close();
        }
    }

    private ByteArrayOutputStream mByteArrayOutputStream;

    public BufferedResponseWrapper(HttpServletResponse response) throws IOException
    {
        super(response);
        mByteArrayOutputStream = new ByteArrayOutputStream();
        mTeeOutputStream = new TeeServletOutputStream(super.getResponse().getOutputStream(), mByteArrayOutputStream);
    }

    @Override
    public PrintWriter getWriter() throws IOException
    {
        return super.getResponse().getWriter();
    }

    @Override
    public ServletOutputStream getOutputStream() throws IOException
    {
        return mTeeOutputStream;
    }

    public String getResponseBody()
    {
        return mByteArrayOutputStream.toString();
    }

}

Answer 7

执行此操作的一种简单方法是将请求正文作为字符串获取，然后解析为 Java 对象。你可以随意使用这个字符串。

所以在你的例子中：

@RequestMapping(method = RequestMethod.POST, consumes="application/json", produces="application/json", value = "employee")
@ResponseBody
public String updateEntity(@RequestBody String empAsString) {

    // Do whatever with the json as String 
    System.out.println(empAsString);

    // Transform it into the Java Object you want
    ObjectMapper mapper = new ObjectMapper();
    Employee emp = mapper.readValue(empAsString, Employee.class);

    // Do some DB Stuff. Anyway, the control flow does not reach this place.
    return "Employee " + emp.getName() + " updated successfully!";
}

作为一个注释，如果你需要它作为一个列表，你可以使用：

List<Employee> eventsList =
                mapper.readValue(jsonInString, mapper.getTypeFactory().constructCollectionType(List.class, Employee.class));

Answer 8

你需要按如下方式实现requestWrapper：

public class DocVerificationRequestWrapper extends HttpServletRequestWrapper {
 private final String body;
 public DocVerificationRequestWrapper(HttpServletRequest request) throws IOException {
   super(request);
   StringBuilder stringBuilder = new StringBuilder();
   BufferedReader bufferedReader = null;
   try {
     InputStream inputStream = request.getInputStream();
     if (inputStream != null) {
       bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
       char[] charBuffer = new char[128];
       int bytesRead = -1;
       while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
         stringBuilder.append(charBuffer, 0, bytesRead);
       }
     } else {
       stringBuilder.append("");
     }
   } catch (IOException ex) {
       throw ex;
   } finally {
     if (bufferedReader != null) {
       try {
         bufferedReader.close();
       } catch (IOException ex) {
         throw ex;
       }
     }
   }
   body = stringBuilder.toString();
 }

 @Override
 public ServletInputStream getInputStream() throws IOException {
   final ByteArrayInputStream byteArrayInputStream = new     ByteArrayInputStream(body.getBytes());
   ServletInputStream servletInputStream = new ServletInputStream() {
     public int read() throws IOException {
       return byteArrayInputStream.read();
     }

    @Override
    public boolean isFinished() {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean isReady() {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public void setReadListener(ReadListener listener) {
        // TODO Auto-generated method stub

    }
   };
   return servletInputStream;
 }

 @Override
 public BufferedReader getReader() throws IOException {
   return new BufferedReader(new InputStreamReader(this.getInputStream()));
 }

 public String getBody() {
   return this.body;
 }
}

然后在filter类的chain.doFilter方法里面传递requestWrapper对象而不是request对象如下：

@Override
public void doFilter(ServletRequest arg0, ServletResponse response, FilterChain chain)
        throws IOException, ServletException {

    logger.info("checking token in filter");
    HttpServletRequest request = (HttpServletRequest) arg0;

    DocVerificationRequestWrapper myRequestWrapper = new DocVerificationRequestWrapper((HttpServletRequest) request);

    String body = myRequestWrapper.getBody();
    logger.info("body = "+body);
    Token token = null;
    try {
        JSONObject jsonObj = new JSONObject(body);
        JSONObject tokenObj = (JSONObject) jsonObj.get("token");
        Gson gson = new Gson();
        token = gson.fromJson(tokenObj.toString(), Token.class);

        if(null != token) {
                if(userVerificationService==null){
                ServletContext servletContext = request.getServletContext();
                WebApplicationContext webApplicationContext = WebApplicationContextUtils.getWebApplicationContext(servletContext);
                userVerificationService = webApplicationContext.getBean(UserVerificationService.class);
            }
                String verStatus = userVerificationService.verifyUser(token);
                logger.info("verStatus = "+verStatus);
                if(verStatus != null && verStatus.equalsIgnoreCase("success")) {
                    chain.doFilter(myRequestWrapper, response); //here replacing request with requestWrapper 
                }else
                    logger.error("Invalid token");
        }else {
                logger.error("token missing.");
        }
    } catch (JSONException e) {
            logger.error("exception in authetication filter " + e);
    }
}

从而解决IOStream关闭异常。

Answer 9

要从 Body 获取数据，您可以尝试在 RequestBodyAdviceAdapter 中读取并重新创建 InputStream：

@ControllerAdvice
public class CustomRequestBodyAdviceAdapter extends RequestBodyAdviceAdapter {

    @Override
    public HttpInputMessage beforeBodyRead(HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) throws IOException {
        String body = IOUtils.toString(inputMessage.getBody(), UTF_8.name());

        HttpInputMessage myMessage = new HttpInputMessage(){
            @Override
            public InputStream getBody() throws IOException {
                return new ByteArrayInputStream(body.getBytes());
            }
            @Override
            public HttpHeaders getHeaders() {
                return inputMessage.getHeaders();
            }
        };

        System.out.println("Data from Body: " + body);

        return super.beforeBodyRead(myMessage, parameter, targetType, converterType);
    }

    @Override
    public Object handleEmptyBody(Object body, HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
        System.out.println("Data from Body is empty");
        return super.handleEmptyBody(body, inputMessage, parameter, targetType, converterType);
    }

    @Override
    public Object afterBodyRead(Object body, HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
        return super.afterBodyRead(body, inputMessage, parameter, targetType, converterType);
    }

    @Override
    public boolean supports(MethodParameter methodParameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
        return true;
    }
}

Answer 10

你可以简单地使用：

import org.apache.commons.io.IOUtils;
import java.nio.charset.Charset;

String requestBody = IOUtils.toString(request.getInputStream(), Charset.forName("UTF-8").toString());

Answer 11

根据我的经验，开发如下： 使用过滤器来包装ServletRequest，然后你可以重复使用获取请求输入流。