Servlet的复习。

温习一下Servlet的应用：

一、Servlet在web.xml中的配置：

<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>Login</servlet-name>
<servlet-class>com.servlet.Login</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Login</servlet-name>
<url-pattern>/servlet/Login</url-pattern>
</servlet-mapping>

    注：<url-pattern>的取值很重要，在表单中要用到。

二、Servlet类如下所示：

package com.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 Login extends HttpServlet {
/**
* Constructor of the object.
*/
public Login() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String nextPage =
"";
HttpSession session = request.getSession();
AccountBean account = new AccountBean();
String userName = request.getParameter("username");
String pwd = request.getParameter("pwd");
account.setUsername(userName);
account.setPassword(pwd);
if(account.getUsername().equals("hongboliu") && account.getPassword().equals("654321")){
System.out.println();
session.setAttribute("account", account);
nextPage = "http://www.google.com.hk";
}else{
nextPage = "http://www.baidu.com";
}
response.sendRedirect(nextPage);
return ;
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
System.out.println("init method");
}
}

三、  AccountBean的设计如下：

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

 四、Form表单内容如下：

<form action="servlet/Login" method="post">
username：<input type="text" name="username"><br>
password：<input type="password" name="pwd"><br>
<input type="submit" value=" 确 定 ">
</form>

    注：form 中action的取值要与web.xml中<url-pattern>的值一致。

五、完成了。

最后

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