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一个简单的jsp+servlet实例，实现简单的登录

2015-10-07 13:43 751 查看
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：

[html]
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<body>

<form
action="login">

username:<input
type="text"
name="username"><br>

password:<input
type="password"
name="pwd"><br>

<input
type="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：

[java]
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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：

[java]
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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 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;
}

}

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

[html]
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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

[html]
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<body>

Login Failed! <br>

</body>

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


7、修改web.xml配置文件

[html]
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<?xml
version="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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