使用Eclipse创建一个简单的servlet项目（账号密码）
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1.创建一个servlet
1 package com.huawei.jiekou; 2 3 import java.io.IOException; 4 import javax.servlet.ServletException; 5 import javax.servlet.annotation.WebServlet; 6 import javax.servlet.http.HttpServlet; 7 import javax.servlet.http.HttpServletRequest; 8 import javax.servlet.http.HttpServletResponse; 9 10 /** 11 * Servlet implementation class TestServlet 12 */ 13 @WebServlet(description = "???????servlet", urlPatterns = { "/TestServlet" }) 14 public class dengru extends HttpServlet { 15 private static final long serialVersionUID = 1L; 16 17 /** 18 * @see HttpServlet#HttpServlet() 19 */ 20 public dengru() { 21 super(); 22 // TODO Auto-generated constructor stub 23 } 24 25 /** 26 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) 27 */ 28 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 29 // TODO Auto-generated method stub 30 String name = request.getParameter("name"); 31 String sex = request.getParameter("sex"); 32 String age = request.getParameter("age"); 33 String str = "{\"name\":\"" + name + "\",\"sex\":\"" + sex + "\",\"age\":" + age + "}"; 34 response.getWriter().write(str); 35 // response.getWriter().append("Served at: ").append(request.getContextPath()); 36 } 37 38 /** 39 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 40 */ 41 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 42 // TODO Auto-generated method stub 43 // doGet(request, response); 44 String account = request.getParameter("account"); 45 String psd = request.getParameter("psd"); 46 if(account.equals("admin") && psd.equals("123456")) { 47 request.getRequestDispatcher("test1.jsp").forward(request, response); 48 }else if(account.equals("admin") && !psd.equals("123456")) { 49 request.setAttribute("psdErrorString", "password is error"); 50 request.getRequestDispatcher("test.jsp").forward(request, response); 51 }else if(!account.equals("admin") && psd.equals("123456")) { 52 request.setAttribute("accountErrorString", "account is error"); 53 request.getRequestDispatcher("test.jsp").forward(request, response); 54 }else { 55 request.setAttribute("errorString", "login error"); 56 request.getRequestDispatcher("test.jsp").forward(request, response); 57 } 58 } 59 60 }
创建jsp
1 <%@ page language="java" contentType="text/html; charset=utf-8" 2 pageEncoding="utf-8"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 7 <title>Insert title here</title> 8 </head> 9 <body> 10 <form action="TestServlet" method="post"> 11 账号:<input type="text" name="account" />${accountErrorString }<br> 12 密码:<input type="password" name="psd" />${psdErrorString }<br> 13 <input type="submit" value="提交" /><br>${errorString } 14 </form> 15 16 </body> 17 </html>
1 <%@ page language="java" contentType="text/html; charset=utf-8" 2 pageEncoding="utf-8"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 7 <title>Insert title here</title> 8 </head> 9 <body> 10 <h1>登录成功</h1> 11 </body> 12 </html>
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