简易Struts2登录实现

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简易Struts2登录实现

1. Struts2简介：

Struts有两个版本。

Struts1是最早的基于MVC模式的轻量级web框架，它能够合理地划分代码结构，并包含验证框架，国际化框架等多种实用工具框架。

随着技术的进步，Struts1的局限性也越多的暴露出来。Struts2是Struts1的下一代产品，实在Struts1和webwork技术的基础上进行合并后的全新框架。

事实上，Struts1和Struts2在设计思想上是很不相同的。Struts2是以webwork为核心的，采用拦截器的机制来处理用户的请求。

所以，Struts2可以理解为是webwork的更新产品。

2. struts运行流程：

jsp请求à xml.xml(过滤)àstruts .xml(action请求路径)àjava(路径对应的控制器)à

struts.xml(result请求路径)àjsp(反馈请求结果)

3. 整个项目图：

使用到的相关知识：

驱动模型,JDBC,properties,struts标签

4. 源代码：

1. 导入jar包

2. Web.xml核心过滤器

<?xml version="1.0" encoding="UTF-8"?>

<web-appxmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID"version="2.5">

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<filter-name>struts2</filter-name>

<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>struts2</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

</web-app>

3. 数据库->user表

create table user(

id int primary key auto_increment,

username varchar(20) unique,

password varchar(18)

);

insert intouser(username,password) values('ww','123');

select * from user where username='ww' and password='123';

4.entity->User.java：

package entity;

public class User{

private int id;

private String username;

private String password;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

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;

}

@Override

public String toString() {

return "User [id=" + id+ ", username=" + username + ", password="

+ password +"]";

}

5.utils->JDBCUtils

package utils;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.Properties;

public class JDBCUtils {

private staticProperties prop;

static {

prop =new Properties();

/*InputStream in3=new FileInputStream(new File("./src/db.properties"));*/

try {

prop.load(JDBCUtils.class.getClassLoader().getResourceAsStream(

"db.properties"));

Class.forName(prop.getProperty("driver"));

}catch (Exception e) {

thrownew RuntimeException(e);

}

public staticConnection getConnection() {

try{

returnDriverManager.getConnection(prop.getProperty("url"),

prop.getProperty("username"),prop.getProperty("password"));

}catch (SQLException e) {

thrownew RuntimeException(e);

}

public staticvoid close(Connection conn,PreparedStatement prep,ResultSet rs){

if(rs !=null){

try{

rs.close();

}catch (SQLException e) {

e.printStackTrace();

}finally{

rs = null;

}

if(prep!= null){

try{

prep.close();

}catch (SQLException e) {

e.printStackTrace();

}finally{

prep = null;

}

if(conn!= null){

try{

conn.close();

}catch (SQLException e) {

e.printStackTrace();

}finally{

conn = null;

}

6.config->db.properties

driver=com.mysql.jdbc.Driver

url=jdbc:mysql://127.0.0.1:3306/test?characterEncoding=utf-8

username=root

password=root

7.dao->UserDao.java

package dao;

import entity.User;

public interface UserDao {

public User getUser(String username,String password);//查找这个用户

}

8.dao.Impl->UserDaoImpl.java

package dao.impl;

importjava.sql.Connection;

importjava.sql.PreparedStatement;

importjava.sql.ResultSet;

importutils.JDBCUtils;

importdao.UserDao;

importentity.User;

public classUserDaoImpl implements UserDao{

private Connection conn;

private PreparedStatement prep;

private ResultSet rs;

public User getUser(String username,Stringpassword) {

try {

String sql="select * fromuser where username=? and password=?";

conn=JDBCUtils.getConnection();

prep=conn.prepareStatement(sql);

prep.setString(1, username);

prep.setString(2, password);

rs=prep.executeQuery();

if (rs.next()) {

User user=new User();

user.setId(rs.getInt("id"));

user.setUsername(rs.getString("username"));

user.setPassword(rs.getString("password"));

return user;

}else {

return null;

}

} catch (Exception e) {

throw new RuntimeException(e);

}finally{

JDBCUtils.close(conn, prep,rs);

}

9.service->UserService.java

package service;

import entity.User;

public interfaceUserService {

public User getUser(String username,String password);//查找这个用户

}

10.service.impl->UserServiceImpl.java

package service.impl;

importdao.UserDao;

import dao.impl.UserDaoImpl;

importservice.UserService;

importentity.User;

public classUserServiceImpl implements UserService{

private UserDao userDao=new UserDaoImpl();

public User getUser(String username,String password) {

return userDao.getUser(username,password);

}

11.action->LoginAction.java

package action;

importservice.UserService;

importservice.impl.UserServiceImpl;

importcom.opensymphony.xwork2.ActionSupport;

importcom.opensymphony.xwork2.ModelDriven;

importentity.User;

public classLoginAction extends ActionSupport implements ModelDriven<User>{

private static final longserialVersionUID = 1L;

private UserService userService=newUserServiceImpl();

private User user=new User();

@Override

public String execute() throws Exception{

System.out.println(user.getUsername());

System.out.println(user.getPassword());

UseruserInfo=userService.getUser(user.getUsername(),user.getPassword());

System.out.println(userInfo);

if (userInfo!=null) {

return SUCCESS;

}else {

return ERROR;

}

public User getModel() {

return user;

}

12.config->user.xml

<?xmlversion="1.0" encoding="UTF-8" ?>

<!DOCTYPEstruts PUBLIC

"-//Apache Software Foundation//DTDStruts Configuration 2.3//EN"

"http://struts.apache.org/dtds/struts-2.3.dtd">

<global-results>

<resultname="error">/error.jsp</result>

</global-results>

<resultname="success">/success.jsp</result>

</action>

</package>

</struts>

13.src->struts.xml

<?xmlversion="1.0" encoding="UTF-8" ?>

<!DOCTYPEstruts PUBLIC

"-//Apache Software Foundation//DTDStruts Configuration 2.3//EN"

"http://struts.apache.org/dtds/struts-2.3.dtd">

<constantname="struts.i18n.encoding"value="UTF-8"></constant>

<includefile="user.xml"></include>

</struts>

14.webRoot->login.jsp

<%@ pagelanguage="java" import="java.util.*"pageEncoding="UTF-8"%>

<%@ tagliburi="/struts-tags" prefix="s" %>

<!DOCTYPE HTMLPUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

</head>

<body>

<s:formaction="login.action">

<s:label>用户登录</s:label>

<s:textfield name="username"label="用户名"></s:textfield>

<s:textfield name="password"label="密码"></s:textfield>

<s:submit value="登录"></s:submit>

</s:form>

</body>

</html>

15.webRoot->success.jsp

<%@ pagelanguage="java" import="java.util.*"pageEncoding="UTF-8"%>

<%@ tagliburi="/struts-tags" prefix="s" %>

<!DOCTYPE HTMLPUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

</head>

<body>

用户信息:

用户名： <s:propertyvalue="username"/><br>

密码：<s:propertyvalue="password"/>

</body>

</html>

16.webRoot->error.jsp

<%@ pagelanguage="java" import="java.util.*"pageEncoding="UTF-8"%>

<%@tagliburi="/struts-tags" prefix="s" %>

<!DOCTYPE HTMLPUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

</head>

<body>

用户名或密码不正确

</body>

</html>

5. 运行结果：

登录页面：

成功页面：

错误页面：

此时，一个比较综合的Struts框架的登录页面就算完成了。可以根据自身需求不断扩展功能。

本内容由安康学院“雨季”原创！

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