JavaWeb——Get、Post请求中文乱码问题

最近在重温JavaWeb基础内容，碰到了之前也时常遇到的中文乱码问题，想着反正是经常要处理的，不如当即就把它整理出来放在博客里，省得遇到时再去到处搜。

　　1. Post请求乱码的解决方案:

　　 手工创建一个过滤器实现javax.servlet.Filter接口:

public class CharacterEncodingFilter implements Filter {

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

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        //解决以Post方式提交的中文乱码问题
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        
        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {

    }

}

　　在web.xml中配置该过滤器:

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<filter>    <filter-name>CharacterEncodingFilterfilter-name>    <filter-class>cn.lby.filter.CharacterEncodingFilterfilter-class> filter> <filter-mapping>    <filter-name>CharacterEncodingFilterfilter-name>    <url-pattern>/*url-pattern> filter-mapping>

　　当然，实际开发中一般不会去自己做这个Filter，都是利用框架里封装好的，传参也能通过配置来完成，十分方便，比如spring通常我们会在web.xml中写入下面的代码:

    
        CharacterEncodingFilter
        org.springframework.web.filter.CharacterEncodingFilter
        
            encoding
            UTF-8
        
    
    
        CharacterEncodingFilter
        /*
    

 2. Get请求乱码的解决方案:

　　在字符过滤器中使用动态代理解决中文乱码:

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public class CharacterEncodingFilter implements Filter {       @Override     public void init(FilterConfig filterConfig) throws ServletException {       }       @Override     public void doFilter(ServletRequest request, ServletResponse response,             FilterChain chain) throws IOException, ServletException {         //解决以Post方式提交的中文乱码问题         request.setCharacterEncoding("UTF-8");         response.setCharacterEncoding("UTF-8");         response.setContentType("text/html;charset=UTF-8");                   ServletRequest requestProxy = getHttpServletRequestProxy((HttpServletRequest)request);         chain.doFilter(requestProxy, response);     }       @Override     public void destroy() {       }       /**     * @Method: getHttpServletRequestProxy     * @Description: 获取HttpServletRequest对象的代理对象     * @param request     * @return HttpServletRequest对象的代理对象     */     private ServletRequest getHttpServletRequestProxy(final HttpServletRequest request){         ServletRequest proxy  = (ServletRequest) Proxy.newProxyInstance(                 CharacterEncodingFilter.class.getClassLoader(),                 request.getClass().getInterfaces(),                 new InvocationHandler(){                     @Override                     public Object invoke(Object proxy, Method method, Object[] args)                             throws Throwable {                         //如果请求方式是get并且调用的是getParameter方法                         if (request.getMethod().equalsIgnoreCase("get") && method.getName().equals("getParameter")) {                             //调用getParameter方法获取参数的值                             String value = (String) method.invoke(request, args);                             if(value==null){                                 return null;                             }                             //解决以get方式提交的中文乱码问题                             return new String(value.getBytes("iso8859-1"),"UTF-8");                         }else {                             //直接调用相应的方法进行处理                             return method.invoke(request, args);                         }                     }                 });         //返回HttpServletRequest对象的代理对象         return proxy;     }         }

　　如果觉得上面的方式太繁琐，也可以通过修改 tomcat 的 server.xml 配置文件:

1	<Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/>

　　改成:

1	<Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443" useBodyEncodingForURI="true"/>

　　注: 如果是ajax发起的get请求中文依然会乱码，这时候需要把 useBodyEncodingForURI="true" 改为 URIEncoding="UTF-8" 。

 

　　下面是测试两种乱码问题解决方案的 demo ，如果懒得写可以参考一下:

　　首先是jsp页面:

  body {
    text-align: center;
      padding: 60px 150px;
      margin-right: 150px;
      line-height: 2.0em;
    }



       
      <%--使用get的方式访问 --%>
       超链接(get方式请求)

       


       

               用户名：
           
       
       
       
       
       

　　后台服务:

public class EncodingServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public EncodingServlet() {
        super();
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String username = request.getParameter("username");
        String method = request.getMethod();
        PrintWriter out = response.getWriter();
        System.out.println("请求方式为：" + method);
        out.write("请求方式为：" + method);
        out.write("
");
        System.out.println("请求参数为：" + username);
        out.write("请求参数为：" + username);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}

　　web.xml 中的 Servlet 配置我这里就不发了。