第一步：web.xml
Java code?
<?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>loginServlet</servlet-name>
<servlet-class>com.servlet.loginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>loginServlet</servlet-name>
<url-pattern>/loginServlet</url-pattern>
</servlet-mapping>
</web-app>
第二步：数据库
Java code?
/*
SQLyog Ultimate v8.32
MySQL - 5.5.23 : Database - student
*********************************************************************
*/
/*!40101 SET NAMES utf8 */
/*!40101 SET SQL_MODE=''*/
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */
CREATE DATABASE /*!32312 IF NOT EXISTS*/`student` /*!40100 DEFAULT CHARACTER SET utf8 */
USE `student`
/*Table structure for table `user` */
DROP TABLE IF EXISTS `user`
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`user` varchar(50) NOT NULL,
`pwd` varchar(50) NOT NULL,
`name` varchar(50) NOT NULL,
`age` int(50) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8
/*Data for the table `user` */
insert into `user`(`id`,`user`,`pwd`,`name`,`age`) values (1,'zhangsan','123','张三',21)
/*!40101 SET SQL_MODE=@OLD_SQL_MODE */
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */
第三步：登录login.jsp
Java code?
<%@ page language="java" contentType="text/html charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>xx系统</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<div align="center"> <font size=" 2" color="#FF6633">用户登录</font>
</div>
<form id="form1" name="form1" method="post" action="loginServlet">
<table width="357" border="0" align="center">
<tr>
<td width="128">用户名：</td>
<td width="219"><label>
<input name="user" type="text" id="user" />
</label></td>
</tr>
<tr>
<td>密 码：</td>
<td><label>
<input name="pwd" type="password" id="pwd" />
</label></td>
</tr>
<tr>
<td><label>
<input type="submit" name="Submit" value="登录" />
</label></td>
</tr>
</table>
<p> </p>
</form>
</body>
</html>
第四步：success.jsp
Java code
<%@ page language="java" contentType="text/html charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
${address }</br>
${port }</br>
</body>
</html>
第五步：loginServlet.java
Java code
package com.servlet
import java.io.IOException
import java.io.PrintWriter
import java.net.InetAddress
import java.sql.SQLException
import javax.servlet.ServletException
import javax.servlet.http.HttpServlet
import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse
import javax.servlet.http.HttpSession
import com.dao.Dao
public class loginServlet extends HttpServlet {
public void destroy() {
super.destroy() // Just puts "destroy" string in log
// Put your code here
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8")
response.setContentType("text/html")
PrintWriter out = response.getWriter()
String name = new String(request.getParameter("user").getBytes(
"ISO8859_1"), "GBK")
String pwd = new String(request.getParameter("pwd").getBytes(
"ISO8859_1"), "UTF-8")
User user = new User()
user.setUser(name)
user.setPwd(pwd)
Dao dao = new Dao()
boolean isLogin
try {
isLogin = dao.logoin(user)
if (isLogin) {
InetAddress inetAddress = InetAddress.getLocalHost()
String m = inetAddress.getHostAddress()
int n = request.getRemotePort()
System.out.println(m+"*********"+ n)
HttpSession session = request.getSession()
session.setAttribute("address", m)
session.setAttribute("port", n)
response.sendRedirect("success.jsp")
} else {
response.sendRedirect("index.jsp")
}
} catch (SQLException e) {
e.printStackTrace()
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response)
}
public void init() throws ServletException {
}
}
Java code
package com.servlet
public class User {
private String user
private String pwd
private String name
private int age
public String getUser() {
return user
}
public void setUser(String user) {
this.user = user
}
public String getPwd() {
return pwd
}
public void setPwd(String pwd) {
this.pwd = pwd
}
public String getName() {
return name
}
public void setName(String name) {
this.name = name
}
public int getAge() {
return age
}
public void setAge(int age) {
this.age = age
}
}
Java code?
package com.util
import java.sql.Connection
import java.sql.DriverManager
import java.sql.SQLException
public class GetConnection {
//通过静态方法注册驱动，获得连接
public static Connection getConnection(){
String driver = "com.mysql.jdbc.Driver"
String url = "jdbc:mysql://localhost/student"
Connection con = null
try {
Class.forName(driver)
try {
con = DriverManager.getConnection(url,"root","123456")
} catch (SQLException e) {
e.printStackTrace()
}
} catch (ClassNotFoundException e) {
e.printStackTrace()
}
System.out.println("已获得数据库的连接")
return con
}
/*public static void main(String args[]){
getConnection()
}*/
}
Java code?
package com.daoimport java.sql.Connection
import java.sql.PreparedStatement
import java.sql.ResultSet
import java.sql.SQLException
import com.servlet.User
import com.util.GetConnection
public class Dao {
private Connection conn
private PreparedStatement pstat
String sql = ""
/**
*
* 用户登录
*/
public boolean logoin(User user) throws SQLException {
conn = GetConnection.getConnection()
boolean i = false
sql = "select * from user where user=? and pwd=?"
pstat = conn.prepareStatement(sql)
pstat.setString(1, user.getUser())
pstat.setString(2, user.getPwd())
ResultSet rs1 = (ResultSet) pstat.executeQuery()
if (rs1.next()) {
i = true
rs1.close()
pstat.close()
} else {
i = false
rs1.close()
pstat.close()
}
conn.close()
return i
}
/**
* 用户注册
*/
public void addUser(User user) {
conn = GetConnection.getConnection()
sql = "insert into user values(?,?,?,?)"
try {
pstat = conn.prepareStatement(sql)
pstat.setString(1, user.getUser())
pstat.setString(2, user.getPwd())
pstat.setString(3, user.getName())
pstat.setInt(5, user.getAge())
pstat.executeUpdate()
pstat.close()
conn.close()
} catch (SQLException e) {
e.printStackTrace()
}
}
}
注意事项：1.数据库用户密码；2.访问地址。
如果数据库表中有记录，就证明你的插入没有问题，但是查询为空，检查下你的查询语句，直接使用sysout.out.println()输出看看.我们对于JAVA初学者和自学者，对JAVASE、JAVAEE和三大框架进行辅导,如果需要详细了解，请查看我资料的网址连接，我们一定耐心为你解答。1.在java EE中新建一个Dynamic Web Project。（如果是第一次建web项目的话，想选择other，你会看到如下窗口）2.这是会出现一个对话框，要你填写你所建web项目的名字，还有配置路径。名字自己想一个就好了，关键是不能漏了配置
Target runtime后面的New Runtime会出现个对话框。
因为我电脑的Tomcat 是7.0的所以这里我选择的是Apache Tomcat v7.0
然后你要做的就是找到Tomcat的路径就可以了
点击Browse,找到路径，然后确定
Tomcat 的下载网址是： http://www.apache.org
（注意事项：在创建项目的最后一步时，会出现这个窗口，在这个窗口的最后一行，前面的那个方框要打上√。
）
4.按上面步骤做完之后，在做窗口会看到已经创建好了一个web项目
然后找到Mysql中的mysql-connector-java-5.0.5-bin.jar文件，（这个文件下载后跟安装软件在一起，通常要先解压。）
将这个文件复制到web/WebContent/WEB-INF/bin目录下，这样就可以进行跟数据库的连接了···
5.然后就是新建一个servlet的新建了，servlet是建在web/java Resource:src路径下的，在这里新建一个servlet会出现如下窗口
填好java package跟class name这两条之后
一直按next最后出现这个窗口，在这里选择你需要的方法。
1. src: 用于保存Java源文件
2. build: Java源文件编译后目标文件的保存位置。
3. WebContent: Web应用文件的保存位置。
标准的Web应用要求编译后的Java类文件在WebContent的WEB-INF/classes子目录中，可以将Eclipse的编译目标路径java build path设置为WebContent/WEB-INF/classes.进行这样的修改目的是为了将来的部署或者打包更方便一些，编译后的程序直接放置到同tomcat下就可以运行，不需要再做任何调整。
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