各种编码问题产生原因以及解决办法---------响应编码，请求编码，URL编码
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响应编码
产生原因以及解决办法：
示例：
1 package cn.yzu; 2 import java.io.IOException; 3 import javax.servlet.ServletException; 4 import javax.servlet.http.HttpServlet; 5 import javax.servlet.http.HttpServletRequest; 6 import javax.servlet.http.HttpServletResponse; 7 public class AServlet extends HttpServlet { 8 public void doGet(HttpServletRequest request, HttpServletResponse response) 9 throws ServletException, IOException { 10 response.setContentType("text/html;charset=utf-8"); 11 response.getWriter().println("张三"); 12 response.getWriter().println("李四"); 13 } 14 }
运行截图：
请求编码
POST请求：
GET请求(conf/server.xml)：
示例：
index.jsp
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 7 <html> 8 <head> 9 <base href="<%=basePath%>"> 10 <title>My JSP \'index.jsp\' starting page</title> 11 <meta http-equiv="pragma" content="no-cache"> 12 <meta http-equiv="cache-control" content="no-cache"> 13 <meta http-equiv="expires" content="0"> 14 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 15 <meta http-equiv="description" content="This is my page"> 16 </head> 17 <body> 18 <form action="AServlet" method="post"> 19 <input type="text" value="张三" name="zs"> 20 <input type="submit" value="post请求"> 21 </form><hr> 22 <form action="AServlet" method="get"> 23 <input type="text" value="李四" name="ls"> 24 <input type="submit" value="get请求"> 25 </form> 26 </body> 27 </html>
AServlet
1 package cn.yzu; 2 import java.io.IOException; 3 import javax.servlet.ServletException; 4 import javax.servlet.http.HttpServlet; 5 import javax.servlet.http.HttpServletRequest; 6 import javax.servlet.http.HttpServletResponse; 7 public class AServlet extends HttpServlet { 8 public void doGet(HttpServletRequest request, HttpServletResponse response) 9 throws ServletException, IOException { 10 //处理get请求 11 System.out.println(request.getParameter("ls")); //不处理 12 String name = request.getParameter("ls"); 13 byte[] b = name.getBytes("iso-8859-1"); //回退 14 name = new String(b, "utf-8"); //重编 15 System.out.println(name); 16 17 } 18 public void doPost(HttpServletRequest request, HttpServletResponse response) 19 throws ServletException, IOException { 20 //处理post请求 21 request.setCharacterEncoding("utf-8"); 22 String username = request.getParameter("zs"); 23 System.out.println(username); 24 } 25 }
页面：
输出结果：
URL编码：
URL编码解码示例：
1 import java.io.UnsupportedEncodingException; 2 import java.net.URLDecoder; 3 import java.net.URLEncoder; 4 import org.junit.Test; 5 public class Demo { 6 @Test 7 public void fun1() throws UnsupportedEncodingException { 8 String name = "张三"; 9 String s = URLEncoder.encode(name, "UTF-8");//编码 10 System.out.println(s); 11 s = URLDecoder.decode(s, "utf-8"); //解码 12 System.out.println(s); 13 } 14 }
结果：
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