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使用过滤器完成对中文编码的统一处理问题：

表单页面：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>        
   
            用户名:
    
    
        密  码:
    
    
        
        
   

处理表单的Servlet：

public class EncodingServlet extends HttpServlet {
       protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
           String username = request.getParameter("username");        String password = request.getParameter("password");        System.out.println(username + "：" + password);    }    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
           doPost(request, response);    }}

过滤器：

package pers.zhang.filter;import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;import java.io.IOException;import java.io.UnsupportedEncodingException;/** * @author zhang * @date 2019/9/21 - 15:55 */public class EncodingFilter implements Filter {
       @Override    public void init(FilterConfig filterConfig) throws ServletException {
       }    @Override    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
           //被增强的对象        HttpServletRequest request = (HttpServletRequest) servletRequest;        //增强对象        EnhanceRequest enhanceRequest = new EnhanceRequest(request);        filterChain.doFilter(enhanceRequest, servletResponse);    }    @Override    public void destroy() {
       }}class EnhanceRequest extends HttpServletRequestWrapper {
       private HttpServletRequest request;    public EnhanceRequest(HttpServletRequest request) {
           super(request);        this.request = request;    }    //对getParaameter增强    @Override    public String getParameter(String name) {
           String parameter = request.getParameter(name);//乱码        try {
               parameter = new String(parameter.getBytes("iso8859-1"),"UTF-8");        } catch (UnsupportedEncodingException e) {
               e.printStackTrace();        }        return parameter;    }}

配置：

           
    
     encodingFilter
            
    
     pers.zhang.filter.EncodingFilter
        
       
           
    
     encodingFilter
            
    
     /*
        
   

测试：

张三：123456

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