全站编码解决Get、Post乱码问题（Servlet）_servlet filter实现全站统一编码,解决get请求中文乱码问题-优快云博客

本文链接：https://blog.youkuaiyun.com/zhangwei408089826/article/details/38554381

本文提供了一个解决全站编码乱码现象的方法，包括建立index.jsp页面、ASservlet页面、创建编码拦截器(CharSetFilter.java)及对request进行调包(CharSetRequest.java)，并指导如何将这些类打包成.jar文件，实现全站布局。

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我们经常会在javaee进行网站编写的时候出现servlet的乱码问题，如何解决这一问题成为了程序员的烦心事。现在，我会大家提供了一种解决全站编码乱码现象的方法，大家可以尝试使用：

例子：

1.建立一个index.jsp页面：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  
  <body>
    <span style="color:#ff0000;"><a href="<c:url value='/AServlet?username=章伟'/>">Get</a><br/></span><span style="color:#009900;">//Get()方法</span><span style="color:#ff0000;">
    <form action="<c:url value='/AServlet'/>" method="post"></span><span style="color:#009900;">//Post()方法</span><span style="color:#ff0000;">
    	用户名：<input type="text" name="username">
    	<input type="submit" value="提交">
    </form></span>
  </body>
</html>

2.建立对应的ASservlet页面：

package com.victorzhang.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class AServlet extends HttpServlet {

	public void <span style="color:#ff0000;">doGet</span>(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String username = request.getParameter("username");
		response.getWriter().print("Get-->username:" + username);
	}

	
	public void <span style="color:#ff0000;">doPost</span>(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String username = request.getParameter("username");
		response.getWriter().print("Post-->username:" + username);
	}

}

在进行到这一步之后，我们进行测试，会发现提交页面会出现乱码情况。

3.创建编码拦截器，CharSetFilter.java，注意：设置时候是/*，进行全部过滤。

package com.victorzhang.servlet;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;

@WebFilter("/*")
public class CharSetFilter implements Filter {

   
	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		<span style="color:#ff0000;">request.setCharacterEncoding("utf-8");</span><span style="color:#009900;">//只是处理了POST的请求</span>
		<span style="color:#ff0000;">response.setContentType("text/html;charset=utf-8");</span><span style="color:#009900;">//处理响应的编码</span>
		
		<span style="color:#009900;">//创建request</span>
		<span style="color:#ff0000;">CharSetRequest req = new CharSetRequest((HttpServletRequest)request);</span>
		<span style="color:#009900;">//运行时，将request调包</span>
		<span style="color:#ff0000;">chain.doFilter(req, response);</span><span style="color:#009900;">//在目标资源中使用的request是调包后的request</span>
	}

	public void init(FilterConfig fConfig) throws ServletException {
	}

}

4.在第三步的request进行调包时候，使用到了CharSetRequest.java类：

package com.victorzhang.servlet;

import java.io.UnsupportedEncodingException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

public class CharSetRequest extends HttpServletRequestWrapper {

	public CharSetRequest(HttpServletRequest request) {
		super(request);<span style="color:#009900;">//调用父类的构造器，给父类传递底层对象</span>
	}
	
	<span style="color:#009900;">/*
	 * 增强getParameter()方法 
	 */</span>
	@Override
	public String getParameter(String name) {
		<span style="color:#ff0000;">String value = super.getParameter(name);</span>
		<span style="color:#009900;">//判断当前的请求方式，如果为Get需要回退重写</span>
		<span style="color:#ff0000;">if(getMethod().equalsIgnoreCase("GET")){
			try {
				value = new String(value.getBytes("iso-8859-1"),"utf-8");
			} catch (UnsupportedEncodingException e) {
			}
		}
		return value;</span>
	}

}

进行如下操作之后，可以将这些类打包成.jar文件，进行全站布局，解决编码乱码问题。