如何在java中处理302重定向

Question

我有一个从中获取令牌的 url。那部分工作正常。然后这个令牌被用来在另一个 url 中获取价值。 但是在这样做时，我收到了 302 错误。因此，我尝试从响应标头中获取位置参数并在 url 中使用它。但我收到以下错误

org.apache.http.client.ClientProtocolException
    at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:187)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
    at com.citi.clg.originations.strategic.service.CertDashboardServiceImpl.getService(CertDashboardServiceImpl.java:800)
    at com.citi.clg.originations.strategic.dwr.CertDashboardAJAXLookup.getService(CertDashboardAJAXLookup.java:114)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.directwebremoting.impl.CreatorModule$1.doFilter(CreatorModule.java:172)
    at org.directwebremoting.impl.CreatorModule.executeMethod(CreatorModule.java:184)
    at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:353)
    at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:306)
    at org.directwebremoting.dwrp.BaseCallHandler.handle(BaseCallHandler.java:110)
    at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:211)
    at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:185)
    at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:144)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:138)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:528)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:810)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.http.ProtocolException: Target host is not specified
    at org.apache.http.impl.conn.DefaultRoutePlanner.determineRoute(DefaultRoutePlanner.java:71)
    at org.apache.http.impl.client.InternalHttpClient.determineRoute(InternalHttpClient.java:125)
    at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
    ... 43 more

下面是我的代码

String id=jobj1.get("ID").toString();
          try {
                HttpPost httpPost;
          httpPost = new HttpPost(
                    "https://example.com");

        //httpPost.setEntity(new StringEntity(data));
        httpPost.setHeader("Accept", "application/json");
        httpPost.setHeader("Content-type", "application/json");
        CloseableHttpResponse response = client.execute(httpPost);
        System.out.println(response.getEntity().getContent());
        System.out.println(response.getStatusLine().getStatusCode());
        System.out.println(response.getHeaders("Location").toString());
        String tempUrl=response.getHeaders("Location")[0].getValue().replaceAll(" ", "%20");
        System.out.println(response.getHeaders("Location")[0].getValue().replaceAll(" ","%20"));
        System.out.println(tempUrl.replace("|","%7c"));
        if(response.getStatusLine().getStatusCode()==302)
        {
            System.out.println(response.getHeaders("Location")[0].getValue().replaceAll(" ", "%20").replace("|", "%7c"));
            httpPost=new HttpPost(URLEncoder.encode(response.getHeaders("Location")[0].getValue(),"UTF-8"));
            //httpPost=new HttpPost(response.getHeaders("Location")[0].getValue().replaceAll(" ", "%20").replace("|", "%7c"));
            httpPost.setHeader("Accept", "application/json");
            httpPost.setHeader("Content-type", "application/json");
             response = client.execute(httpPost);
        }
        if (response.getStatusLine().getStatusCode() == 200 ) {
            BufferedReader br = new BufferedReader(new InputStreamReader((response.getEntity().getContent())));
            String output;
            while ((output = br.readLine()) != null) {
                responseData = responseData + output;
            }
        } else {
            responseData = "{\"status\": \"ERROR\"}";
        }

    } catch (Exception e) {
        e.printStackTrace();
        responseData = "{\"status\": \"ERROR\"}";
    } finally {
        try {
            client.close();
        } catch (IOException e) {
        }
    }

这是我的重定向网址

位置：/enlight.server/login.jsp?goto=/enlight.server/html/scripts/api/assets.jsp?all=true&globalCrit=Host 其中名称：sdcgcgtiblb20pv |直到>1d 和直到 的证书

Answer 1

我注意到您使用的是 apache-httpclient 4.x。

您可以覆盖默认行为以遵循重定向：

适用于 HttpClient 4.3 及更高版本

HttpClient client = HttpClientBuilder.create().setRedirectStrategy(new LaxRedirectStrategy()).build();
HttpResponse response = instance.execute(new HttpPost("http://example.com"));

对于 HttpClient 4.2

DefaultHttpClient client = new DefaultHttpClient();
client.setRedirectStrategy(new LaxRedirectStrategy());
HttpResponse response = client.execute(new HttpPost("http://example.com"));

在 HttpClient 4.2 之前

DefaultHttpClient client = new DefaultHttpClient();
client.setRedirectStrategy(new DefaultRedirectStrategy() {
    private String[] REDIRECT_METHODS = new String[] { 
        HttpGet.METHOD_NAME, HttpPost.METHOD_NAME, HttpHead.METHOD_NAME 
    };

    @Override
    protected boolean isRedirectable(String method) {
        for (String m : REDIRECT_METHODS) {
            if (m.equalsIgnoreCase(method)) {
                return true;
            }
        }
        return false;
    }
});

HttpResponse response = client.execute(new HttpPost("http://example.com"));

Answer 2

我一直在获取令牌并关闭会话并重新打开导致令牌无效和重定向的会话