Java web tomcat编码过滤器不起作用答案

【问题标题】：Java web tomcat encoding filter doesnt workJava web tomcat编码过滤器不起作用
【发布时间】：2015-10-06 01:23:47
【问题描述】：

我使用 intellij idea 和 tomcat 8，这是我的过滤器：

@WebFilter(urlPatterns = { "/*" }, initParams = {@WebInitParam(name = "encoding", value = "UTF-8", description = "Encoding Param") })
public class EncodingFilter implements Filter {

    private String code;

    public void init(FilterConfig filterConfig) throws ServletException {
        code = filterConfig.getInitParameter("encoding");
    }

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        String codeRequest = servletRequest.getCharacterEncoding();
        if (code != null && !code.equalsIgnoreCase(codeRequest)) {
            servletRequest.setCharacterEncoding(code);
            servletResponse.setCharacterEncoding(code);
        }
        filterChain.doFilter(servletRequest, servletResponse);
    }

    public void destroy() {
        code = null;
    }
}

我不明白为什么，但它不起作用，当我输入英文单词时一切正常，但是当我输入俄语字母时，它是这样的：

String address = request.getParameter(PARAM_NAME_ADDRESS); 
//**address : Ð®Ð·ÐµÑÐ¾Ð²Ð° 12 144**

我的jsp中有这个：

<%@ page contentType="text/html; charset=UTF-8" language="java" pageEncoding="UTF-8" %>

可能是什么问题？

【问题讨论】：

标签： java tomcat servlets encoding servlet-filters

【解决方案1】：

需要在页面上设置编码：

<head>
    <meta charset="UTF-8">
</head>

还有（为了完整性）在表单元素中：

<form action="..." accept-charset="UTF-8">

【讨论】：

【解决方案2】：

This question帮了我

问题出在监听器上，我删除了它

@WebListener
public class RequestListener implements ServletRequestListener {

    private final static Logger LOG = Logger.getLogger(RequestListener.class);

    @Override
    public void requestInitialized(ServletRequestEvent servletRequestEvent) {
        String command = servletRequestEvent.getServletRequest().getParameter("command");
        HttpServletRequest request = (HttpServletRequest)servletRequestEvent.getServletRequest();
        LOG.info("Request initialized. Command: " + command + " " + request.getContextPath());
    }

    @Override
    public void requestDestroyed(ServletRequestEvent servletRequestEvent) {
        String command = servletRequestEvent.getServletRequest().getParameter("command");
        LOG.info("Request destroyed. Command: " + command);
    }

}

【讨论】：