一个简单的jsp+servlet实例，实现简单的登录

来源：互联网发布：淘宝有平板客户端吗编辑：程序博客网时间：2024/04/29 18:16

开发环境myeclipse+tomcat6

1、先创建web project，项目名为RegisterSystem，

2、在WebRoot 目录下创建login.jsp文件，只需修改body中的内容，如下所示：

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<body>
<form action="login">
username:<inputtype="text"name="username"><br>
password:<inputtype="password"name="pwd"><br>
<inputtype="submit">
</form>
</body>

<body>   <form action="login">    username:<input type="text" name="username"><br>    password:<input type="password" name="pwd"><br>    <input type="submit">    </form> </body>

3、在scr目录下的com.ht.servlet编写AcountBean.java文件，代码如下：

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package com.ht.servlet;
public class AccountBean {
private String username = "";
private String password ="";
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}

package com.ht.servlet;public class AccountBean { private String username = ""; private String password = ""; public String getPassword() {  return password; } public void setPassword(String password) {  this.password = password; } public String getUsername() {  return username; } public void setUsername(String username) {  this.username = username; }}

4、在scr目录下的com.ht.servlet编写servlet类CheckAccount.java文件，代码如下：

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package com.ht.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class CheckAccountextends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req,resp);
}
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
HttpSession session = req.getSession();
AccountBean account = new AccountBean();
String username = req.getParameter("username");
String pwd = req.getParameter("pwd");
account.setPassword(pwd);
account.setUsername(username);
if((username != null)&&(username.trim().equals("jsp"))) {
if((pwd != null)&&(pwd.trim().equals("1"))) {
System.out.println("success");
session.setAttribute("account", account);
String login_suc = "success.jsp";
resp.sendRedirect(login_suc);
return;
}
}
String login_fail = "fail.jsp";
resp.sendRedirect(login_fail);
return;
}
}

package com.ht.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;public class CheckAccount extends HttpServlet { @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp)   throws ServletException, IOException {  doGet(req,resp); } @Override public void doGet(HttpServletRequest req, HttpServletResponse resp)   throws ServletException, IOException {  HttpSession session = req.getSession();  AccountBean account = new AccountBean();  String username = req.getParameter("username");  String pwd = req.getParameter("pwd");  account.setPassword(pwd);  account.setUsername(username);  if((username != null)&&(username.trim().equals("jsp"))) {   if((pwd != null)&&(pwd.trim().equals("1"))) {    System.out.println("success");    session.setAttribute("account", account);    String login_suc = "success.jsp";    resp.sendRedirect(login_suc);    return;   }  }  String login_fail = "fail.jsp";  resp.sendRedirect(login_fail);  return; } }

5、在WebRoot目录下编写success.jsp文件成功后跳转

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<body>
<%
AccountBean account = (AccountBean)session.getAttribute("account");
%>
username:<%= account.getUsername()%>
<br>
password:<%= account.getPassword() %>
</body>

<body>    <%    AccountBean account = (AccountBean)session.getAttribute("account");    %>    username:<%= account.getUsername()%>     <br>     password:<%= account.getPassword() %></body>

6、在WebRoot目录下编写fail.jsp文件失败后跳转

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<body>
Login Failed! <br>
</body>

<body>   Login Failed! <br></body>

7、修改web.xml配置文件

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<?xmlversion="1.0"encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>CheckAccount</servlet-name>
<servlet-class>com.ht.servlet.CheckAccount</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CheckAccount</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
</web-app>

转载自http://blog.csdn.net/u012767037

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