寫在前面：
web服務器接收到客戶端的http請求，針對這個請求，分別建立了一個代表請求的HttpServletResponse對象；和一個代表響應的HttpServletRequest對象。
如果要獲取客戶端請求過來的參數：HttpServletRequest對象。
如果要給客戶端響應一些信息：找HttpServletResponse對象。
1 package com.wang.servlet; 2 3 import javax.servlet.ServletException; 4 import javax.servlet.http.HttpServlet; 5 import javax.servlet.http.HttpServletRequest; 6 import javax.servlet.http.HttpServletResponse; 7 import java.io.FileInputStream; 8 import java.io.IOException; 9 import java.net.URLEncoder; 10 import java.util.Arrays; 11 12 public class LoginServlet extends HttpServlet { 13 @Override 14 protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 15 //解決后台接收中文亂碼問題 16 req.setCharacterEncoding("utf-8"); 17 resp.setCharacterEncoding("utf-8"); 18 19 String username = req.getParameter("username"); 20 String password = req.getParameter("password"); 21 String[] hobbys = req.getParameterValues("hobbys"); 22 System.out.println("==================================="); 23 System.out.println(username); 24 System.out.println(password); 25 System.out.println(Arrays.toString(hobbys)); 26 System.out.println("==================================="); 27 System.out.println(req.getContextPath()); 28 //通過請求轉發 29 req.getRequestDispatcher("/success.jsp").forward(req,resp); 30 } 31 32 @Override 33 protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 34 doGet(req, resp); 35 } 36 }
寫index.jsp
1 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 2 <html> 3 <head> 4 <title>登錄</title> 5 </head> 6 <body> 7 <h1>登錄</h1> 8 <div> 9 <form action="${pageContext.request.contextPath}/login" method="post"> 10 用戶名：<input type="text" name="username"> <br> 11 密碼：<input type="password" name="password"> <br> 12 愛好： 13 <input type="checkbox" name="hobbys" value="女孩">女孩 14 <input type="checkbox" name="hobbys" value="代碼">代碼 15 <input type="checkbox" name="hobbys" value="唱歌">唱歌 16 <input type="checkbox" name="hobbys" value="電影">電影 17 <br> 18 <input type="submit"> 19 </form> 20 </div> 21 </body> 22 </html>
1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 5 http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" 6 version="4.0" 7 metadata-complete="true"> 8 <!--注冊和映射--> 9 <servlet> 10 <servlet-name>LoginServlet</servlet-name> 11 <servlet-class>com.wang.servlet.LoginServlet</servlet-class> 12 </servlet> 13 <servlet-mapping> 14 <servlet-name>LoginServlet</servlet-name> 15 <url-pattern>/login</url-pattern> 16 </servlet-mapping> 17 </web-app>
1 req.setCharacterEncoding("utf-8"); 2 resp.setCharacterEncoding("utf-8");