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="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>