2 java jsp+servelt入门实例
1.在javaEE平台新建项目test。
2.在WebContent下面的Web-INF,下面建立index.jsp; 登录首页(在web.xml里面有welcome-file-list有相应的 index，如果你要是用别的名，比如login.jsp，你别忘记改就行)
3.在index.jsp的form表单的action属性为action="CheckoutLogin"
4在src下面建立包com.wust.yy,
在包下面建立两个文件，一个不同的java文件，LoginBean.java,另一个建立servelet文件，名字为CheckoutLogin（因为是servelet文件会导入很多包，里面有doget,dopost方法）
5.在CheckoutLogin的doget（）方法中，
HttpSession session=req.getSession();
LoginBean login=new LoginBean();
String username=req.getParameter("username");
String password=req.getParameter("password");
login.setPassword(password);
login.setUsername(username);
if(username!=null && username.trim().equals("yy") && password!=null &&password.trim().equals("123")){
System.out.println("成功");
session.setAttribute("login", login);
String login_suc="success.jsp";
resp.sendRedirect(login_suc);
return; //
}
String login_fail="fail.jsp";
resp.sendRedirect(login_fail);
}
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：
username:
password:
3、在scr目录下的com.ht.servlet编写AcountBean.java文件，代码如下：
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：
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
<%
AccountBean account = (AccountBean)session.getAttribute("account");
%>
username:<%= account.getUsername()%>
password:<%= account.getPassword() %>
6、在WebRoot目录下编写fail.jsp文件 失败后跳转
Login Failed!
7、修改web.xml配置文件
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">