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Java Web解决解析乱码和响应乱码

2024-08-14 21:12:45   222人阅读

package cn.edu.aynu.rjxy.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class AServlet extends HttpServlet {    /*get方式请求时调用的方法     * 什么是get请求？     * 在地址栏输入用户名和密码、超链接、直接在method里面写上get     * get没有请求体 无法设置请求体     * 首先需要获取到username和psw     * 然后把字符串回退为字节数组     * 使用ISO-8859-1编码方式解码     * 把字节数组重新组装成字符串，使用UTF-8编码方式     *      */    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        request.setCharacterEncoding("UTF-8");        //根据参数名获取参数值        String username = request.getParameter("username");        String  psw = request.getParameter("psw");                //使用ISO-8859-1把username的值回退成字节数组        byte[] b = username.getBytes("ISO-8859-1");        //使用UTF-8把字节数组重新解码        username = new String(b,"UTF-8");        //响应输出流的编码方式是UTF-8 客户端、浏览器解码方式也为UTF-8        response.setContentType("text/html;charset=utf-8");        //输入到界面上        response.getWriter().print("username="+username);        response.getWriter().print("psw="+psw);        //输入到控制台上        System.out.println("username="+username);        System.out.println("psw="+psw);    }    //post方式请求调用的方法    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        /*post请求的解码处理   乱码出现的根源是：编码方式和解码方式不一致。         * tomcat服务器默认的解码方式是ISO-8859-1不支持中文。由于post请求         * 有请求体，请求参数是放在请求体中的，设置请求体的解码方式，需要调用         * 方法request.setCharacterEncoding("UTF-8");支持中文         */        request.setCharacterEncoding("UTF-8");        //根据参数名获取参数值        String username = request.getParameter("username");        String  psw = request.getParameter("psw");        //根据参数名获取多个参数值
        String[] hobby = request.getParameterValues("hobby");        //数组的遍历
        for (int i = 0; i < hobby.length; i++) {            System.out.println(hobby[i]);        }        //响应输出流的编码方式是UTF-8 客户端、浏览器解码方式也为UTF-8        response.setContentType("text/html;charset=utf-8");        //输入到界面上        response.getWriter().print("username="+username);        response.getWriter().print("psw="+psw);        //输入到控制台上        System.out.println("username="+username);        System.out.println("psw="+psw);    }}

AServlet.java

 

 

 

 

 

 a.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%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 ‘a.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="http://www.mamicode.com/styles.css">    -->  </head>    <body>   <form action = "/day9/AServlet" method = "post">           用户名：<input type = "text" name = "username"/><br/>           密     码：<input type = "password" name = "psw"/><br/>           爱好：<input type = "checkbox" name = "hobby" value ="Swimming">游泳                <input type = "checkbox" name = "hobby" value ="Sing">唱歌                <input type = "checkbox" name = "hobby" value ="Run">跑步                <input type = "checkbox" name = "hobby" value ="Read">阅读<br>           <input type = "submit" value="提交">   </form>   <hr>   <a href="/day9/AServlet?username=李四&psw=123">get方式请求</a>  </body></html>

 

Java Web解决解析乱码和响应乱码


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