struts+ajax+mysql制作的简单登录

1建立数据库：

drop database st;
create database st;
use st;
create table student(
id int primary key auto_increment,
name varchar(32) unique ,
passwd varchar(12),
email varchar(32),
phone varchar(16),
address varchar(256)
);

建立实体类：

package com.ambow.entity;

public class Student {
private int id;
private String name;
private String password;
private String email;
private String phone;
private String address;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public Student() {
super();
}
public Student(int id, String name, String password, String email,
String phone, String address) {
super();
this.id = id;
this.name = name;
this.password = password;
this.email = email;
this.phone = phone;
this.address = address;
}
}

建立学生类接口：

package com.ambow.dao;

import com.ambow.entity.Student;

public interface StudentDao {
public Student login(String name, String passwd);

public void addUser(Student student);

public void updateUser(Student student);
public Student find(String name);

}

建立跟数据库连接的工具类：

package com.ambow.util;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Properties;

public class JdbcConfig {

private Properties pro= new Properties();

private static JdbcConfig jdbcConfig= null;

private JdbcConfig(){
load();
}

private void load() {
try {

pro.load(this.getClass().getResourceAsStream("/jdbcconfig.properties"));

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}
public static JdbcConfig getInstnce() {

if (jdbcConfig == null) {
jdbcConfig = new JdbcConfig();
}

return jdbcConfig;

}

public String getValues(String key) {

return pro.getProperty(key);

}

public static void main(String[] args) {

}

}

package com.ambow.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JdbcUtil {

private static String DB_DRIVER = null;
private static String DB_URL = null;
private static String DB_USER = null;
private static String DB_PASSWORD = null;

static {
DB_DRIVER = JdbcConfig.getInstnce().getValues("mysql_driver");
DB_URL = JdbcConfig.getInstnce().getValues("mysql_url");
DB_USER = JdbcConfig.getInstnce().getValues("mysql_user");
DB_PASSWORD = JdbcConfig.getInstnce().getValues("mysql_password");
}

public static Connection getConnection() throws ClassNotFoundException,
SQLException {
Class.forName(DB_DRIVER);
return DriverManager.getConnection(DB_URL, DB_USER, DB_PASSWORD);

}

public static void close(ResultSet rs, Statement stmt, Connection conn) {

try {
if (rs != null)
rs.close();

if (stmt != null)
stmt.close();

if (conn != null)
conn.close();

} catch (SQLException e) {

e.printStackTrace();
}

}

public static void main(String[] args) {
try {

System.out.println(DB_DRIVER);
System.out.println(DB_URL);
System.out.println(DB_USER);
System.out.println(DB_PASSWORD);
System.out.println(getConnection());

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (SQLException e) {

e.printStackTrace();

}
}

}
在跟目录下建立jdbcconfig.properties文件：

mysql_driver=com.mysql.jdbc.Driver
mysql_url=jdbc:mysql://localhost:3306/st?useUnicode=true&characterEncoding=gbk
mysql_user=root
mysql_password=1234

写接口的实现：

package com.ambow.daoimpl;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import com.ambow.dao.StudentDao;
import com.ambow.entity.Student;
import com.ambow.util.JdbcUtil;

public class StudentDaoImpl implements StudentDao{

public void addUser(Student student) {
Connection conn = null;
PreparedStatement pstmt = null;
try {
conn = JdbcUtil.getConnection();
String sql = "insert into student ( name , passwd, email, phone, address) values (?,?,?,?,?) ";
pstmt = conn.prepareStatement(sql);
pstmt.setString( 1, student.getName() );
pstmt.setString( 2, student.getPassword() );
pstmt.setString( 3, student.getEmail() );
pstmt.setString( 4, student.getPhone() );
pstmt.setString( 5, student.getAddress() );
int i = pstmt.executeUpdate();
System.out.println(i + "条记录被修改！");
} catch (Exception e) {
e.printStackTrace();

}finally{

JdbcUtil.close(null, pstmt, conn);
}
}

public Student find(String name) {

return null;
}

public Student login(String name, String passwd) {
Student student = null;
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
String sql = "select * from student where name =? and passwd = ?";
conn = JdbcUtil.getConnection();
pstmt = conn.prepareStatement(sql );
pstmt.setString(1, name);
pstmt.setString(2, passwd);
rs = pstmt.executeQuery();
if(rs.next()){
student = new Student();
int index = 1;
student.setId( rs.getInt(index++));
student.setName(rs.getString(index++));
student.setPassword(rs.getString(index++));
student.setEmail(rs.getString(index++));
student.setPhone(rs.getString(index++));
student.setAddress(rs.getString(index++));

}
} catch (Exception e) {
e.printStackTrace();
} finally {
JdbcUtil.close(rs, pstmt, conn);
}
return student;
}

public void updateUser(Student student) {
}
public static void main(String[] args) {
StudentDaoImpl sd = new StudentDaoImpl();
Student st = new Student();
// st.setName("yyyy");
// st.setPassword("1234");
// st.setAddress("anhui");
// st.setEmail("280458609@qq.com");
// sd.addUser(st);
// st = sd.login("yyy", "1234");
// System.out.println(st);
}

}

写要登录页面index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</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">
-->
<script type="text/javascript" src="style/js/jquery-1.5.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#login-sumit").submit(function(){
var username = $("#username").val();
var pwd = $("#pwd").val();
$.ajax({
type: "POST",
url: "<%=basePath%>um/ajaxlogin.do",
data:{username:username,pwd:pwd},
dataType:"json",
success: function(msg){
//alert(msg);
if(msg.rs =="success"){
$("#login-info").empty();
var text = "<span>欢迎,"+msg.username+"光临本店</span>";
$("#login-info").html(text);
}
if(msg.rs =="error"){
var text="<span style='color:red'>"+msg.reason+"</span>"
$("#login-info").prepend(text);
}
},
error:function(XMLHttpRequest, textStatus, errorThrown){
alert(textStatus);
alert(errorThrown);
}
});
return false;
});

});
</script>
</head>
<body>
<div id="login-info">
<form id="login-sumit" method="post">
用户名:<input type="text" id="username" name="username" /><br/>
密码:<input type="password" id="pwd" name="pwd" /><br/>
<input type="submit" value="登录">
</form>
</div>
</body>
</html>

配置web.xml：

<?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">
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

配置struts-config.xml文件：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
"http://struts.apache.org/dtds/struts-config_1_3.dtd">
<struts-config>

<form-beans>
</form-beans>

<global-exceptions>
</global-exceptions>
<global-forwards>
</global-forwards>
<action-mappings>
<action path="/um/login"
type="com.ambow.action.UserAction"
parameter="login"
>
<forward name="success" path="/success_login.jsp"></forward>
<forward name="error" path="/error_login.jsp"></forward>
</action>
<action path="/um/ajaxlogin"
type="com.ambow.action.UserAction"
parameter="ajaxLogin"
>
<forward name="rs" path="/ajax.jsp"></forward>
</action>
</action-mappings>
<message-resources parameter="MessageResources" />
</struts-config>

最后一步写UserAction类：

package com.ambow.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.MappingDispatchAction;
import com.ambow.dao.StudentDao;
import com.ambow.daoimpl.StudentDaoImpl;
import com.ambow.entity.Student;

public ActionForward ajaxLogin(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
//获取页面的提交的信息
String username = request.getParameter("username");
String pwd = request.getParameter("pwd");
//连接数据库查找是否用该用户
StudentDao sd = new StudentDaoImpl();
Student student = new Student();
student = sd.login(username, pwd);

//根据结果处理相应的结果
if(student!=null){
String data = "{/"rs/":/"success/",/"username/":/"bjg/"}";
request.setAttribute("data", data);
return mapping.findForward("rs");
}else{
String data = "{/"rs/":/"error/",/"reason/":/"用户名或密码错误/"}";
request.setAttribute("data", data);
return mapping.findForward("rs");
}
}

}

要导入struts1相关的jar包，同时引入jquery-1.5.min.jss