刚開始学习的人非常有用：纯struts框架实现用户登陆

本人新手一枚。也在学习ssh。高手建议从struts2開始学起，所以我就先仅仅用struts2写了一个demo。能够有助于理解struts2在项目中的作用。

首先简单了解一下struts2 的MVC模式：

M:就是业务逻辑层，代码体现就是：service层

V:就是视图层，代码提现就是：jsp

C:就是控制层。代码提现就是：actionservlet

那么我们会讲代码贴上。并会加一些凝视

首先我们是创建一个动态webproject；

project展示：先依照我的包结构。建好包结构

项目依赖的包：点击此处下载jar包

上代码：

首先 web.xml

<?
xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>struts2-5</display-name>
  
  <filter>
  	<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>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
   
</web-app>

然后是struts.xml

<?xml version="1.0" encoding="UTF-8"?
>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
    <struts>
    	<package name="defalut" extends="struts-default">
    		<action name="user_*_*" class="com.sino.java.action.{1}Action" method="{2}">
    			<result name="success">/pages/success.jsp</result>
    			<result name="error">/pages/error.jsp</result>
    			<result name="tologin">/index.jsp</result>
    			<result name="show">/pages/show.jsp</result>
    			<result name="regsuccess">/pages/regsuccess.jsp</result>
    			<result name="input">/pages/reg.jsp</result>
    			<result name="showbook">/pages/showbook.jsp</result>
    		</action>
    		 
    		 
    	</package>
    </struts> 

我把sql也贴出来吧，后面我会提供下载的连接

/*
SQLyog Ultimate v11.24 (32 bit)
MySQL - 5.5.24 : Database - struts2_4
*********************************************************************
*/


/*!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*/`struts2_4` /*!40100 DEFAULT CHARACTER SET utf8 */;

USE `struts2_4`;

/*Table structure for table `user` */

DROP TABLE IF EXISTS `user`;

CREATE TABLE `user` (
  `name` varchar(30) DEFAULT NULL,
  `username` varchar(30) NOT NULL,
  `password` varchar(30) DEFAULT NULL,
  PRIMARY KEY (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

/*Data for the table `user` */

insert  into `user`(`name`,`username`,`password`) values ('DLK','admin','admin');

/*!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 */;

config.properties：

#请改动以下的数据库username与password，并导入上面的数据库文件
userDaoFactory=com.sino.java.dao.UserDao
url=jdbc:mysql://localhost:3306/struts2_4?
useUnicode=true&characterEncoding=UTF-8
user=root
password=root

log4j.properties

#private static final Logger log = Logger.getLogger(LoginAction.class);
log4j.rootLogger=INFO,A1,R

log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.Target=System.out
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=[%c]%m%n

log4j.appender.R=org.apache.log4j.RollingFileAppender 
log4j.appender.R.File=sshe.log
log4j.appender.R.MaxFileSize=10MB
log4j.appender.R.Threshold=ALL
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=[%p][%d{yyyy-MM-dd HH:mm:ss,SSS}][%c]%m%n

然后就是

java文件：

我依照上面的项目展示的文件夹来贴代码：

----------------------------------------------------------------------------------------

package com.sino.java.action;

import java.util.Iterator;
import java.util.List;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;

import org.apache.log4j.Logger;
import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.sino.java.been.User;
import com.sino.java.dao.UserDao;
import com.sino.java.dao.impl.UserDaoImpl;
import com.sino.java.service.UserService;
import com.sino.java.service.impl.UserServiceImpl;

public class LoginAction extends ActionSupport implements ModelDriven<User> {
	private static final Logger log = Logger.getLogger(LoginAction.class);
	private User user;

	private UserService userservice;

	private UserDao userdao;

	public UserDao getUserdao() {
		return userdao;
	}

	public void setUserdao(UserDao userdao) {
		this.userdao = userdao;
	}

	public User getUser() {
		return user;
	}

	public void setUser(User user) {
		this.user = user;
	}

	private String msg;

	public String getMsg() {
		return msg;
	}

	public void setMsg(String msg) {
		this.msg = msg;
	}

	// 用户登录
	public String login() {
		// 是否已经登陆
		ActionContext action = ActionContext.getContext();
		if (action.getSession().get("username") == ""
				|| action.getSession().get("username") == null) {
			userservice = new UserServiceImpl();
			userdao = new UserDaoImpl();

			log.info("登陆页面传来的数据：用户名：" + user.getUsername() + "+密码："
					+ user.getPassword());
			log.info("userservice:" + userservice.toString());
			log.info("user:" + user.toString());
			log.info("userdao:" + userdao.toString());

			User users = userservice.login(user.getUsername(),user.getPassword());
			log.info("数据库查询的数据：" + users.getName());
			log.info("数据库查询的数据：" + users.getUsername());
			log.info("数据库查询的数据：" + users.getPassword());
			log.info(users);

			if (!"".equals(users.getName()) && users.getName() != null) {
				action.getSession().put("username", users.getUsername());
				action.getSession().put("name", users.getName());
				msg = "恭喜登陆成功！" + users.getName();
				return SUCCESS;
			} else {
				msg = "用户名或密码错误！
";
				return "tologin";
			}
		} else {
			msg = "已经登陆" + user.getUsername();
			return SUCCESS;
		}
	}

	// 注冊用户
	public String reg() {
		userservice = new UserServiceImpl();

		log.info("userservice:" + userservice.toString());
		int a = userservice.reg(user.getName(), user.getUsername(),
				user.getPassword(), user.getAge(), user.getSex());
		log.info("结果：" + a);
		log.info("传人的数据为:" + user.toString());
		if (a != 0) {
			return "regsuccess";
		} else {
			return "regerror";
		}
	}

	public String show() {
		userdao = new UserDaoImpl();
		ActionContext action = ActionContext.getContext();
		String name = (String) action.getSession().get("name");
		List<User> userlist = userdao.getAllUser(name);
		
		log.info("数据库查到数据长度>>" + userlist.size());
		Iterator it = userlist.iterator();
		while (it.hasNext()) {
			User user = new User();
			user = (User) it.next();
			log.info("数据库查询出来的用户名：" + user.getUsername());
			log.info("数据库查询出来的密码：" + user.getPassword());
		}
		HttpServletRequest hsr = ServletActionContext.getRequest();
		hsr.setAttribute("userlist", userlist);
		return "show";
	}

	public String logout() {
		ActionContext action = ActionContext.getContext();
		log.info("将session设置为空！并退出登陆。");
		action.getSession().put("username", null);

		return "tologin";
	}

	@Override
	public User getModel() {
		// TODO Auto-generated method stub
		if (user == null) {
			user = new User();
		}
		return user;
	}

}

-------------------------------------------------------------

package com.sino.java.been;

public class User {
	private String name;
	private String username;
	private String age;
	private String sex;
	private String password;
	
	public User() {
		// TODO Auto-generated constructor stub
	}

	public User(String name, String username, String age, String sex,
			String password) {
		super();
		this.name = name;
		this.username = username;
		this.age = age;
		this.sex = sex;
		this.password = password;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getAge() {
		return age;
	}

	public void setAge(String age) {
		this.age = age;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	 
	
}

----------------------------------------------------------------------------------------

package com.sino.java.dao;

import java.util.List; 

import com.sino.java.been.User;
  
public interface UserDao { 
	public List<User> getAllUser(String name); 
	public User getUser(String username, String password);
	public int insert(User user);
}

------------------------------------------------------------------------------------------

package com.sino.java.dao.factory;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import com.sino.java.dao.UserDao;

public class DaoFactory {
	// 注意 对象的 创建顺序
	private static UserDao userDao = null;
	private static DaoFactory instance = new DaoFactory();

	private DaoFactory() {
		try {
			Properties prop = new Properties();
			// InputStream inStream = new FileInputStream(new
			// File("src/daoconfig.properties"));
			// 长处：文件不一定要和路径绑定，仅仅要文件从在于 ClassPath 中 就能够找得到
			InputStream inStream = DaoFactory.class.getClassLoader()
					.getResourceAsStream("config.properties");
			prop.load(inStream);
			// 从配置文件里获得的 value 值 都是字符串(String)
			 String userDaoClzz = prop.getProperty("userDaoFactory");
			 System.out.println("userdao-"+userDaoClzz);
			// 通过反射方式 创建对象
			 Class clazz = Class.forName(userDaoClzz);
			 userDao = (UserDao) clazz.newInstance();
		} catch (Exception e) {
			throw new ExceptionInInitializerError(e);
		}
	}

	public static DaoFactory getInstance() {
		return instance;
	}

	public static UserDao getUserDao() {
		return userDao;
	}
	
	 
}

--------------------------------------------------------------------------------------------------

package com.sino.java.dao.impl;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;

import com.sino.java.been.User;
import com.sino.java.dao.UserDao;
import com.sino.java.service.impl.UserServiceImpl;
import com.sino.java.utils.JdbcUtils;

public class UserDaoImpl implements UserDao {
	private static final Logger log = Logger.getLogger(UserDaoImpl.class);
 
	public int insert(User user) {
		Connection con = null;
		PreparedStatement ps = null;
		int i = 0;
		ResultSet rs = null;
		try { 
			con = JdbcUtils.getConn();
			String sql = "insert into user(name,username,password) values(?,?,?) ";
			ps = con.prepareStatement(sql);
			ps.setString(1, user.getName());
			ps.setString(2, user.getUsername());
			ps.setString(3, user.getPassword());

			i = ps.executeUpdate();
		} catch (Exception e) {
			// TODO: handle exception
		}finally
		{
			JdbcUtils.free(rs, ps, con);
		}
		return i;
	}

	@Override
	public List<User> getAllUser(String name) {
		// TODO Auto-generated method stub
		Connection con = null;
		List<User> userlist = new ArrayList<User>();
		PreparedStatement ps = null;
		ResultSet rs = null;
		try {
			String sql = "select * from user where name= ? ";
			con = JdbcUtils.getConn();
			ps =  con.prepareStatement(sql);
 
			ps.setString(1, name);
			rs = ps.executeQuery();

			while (rs.next()) {
				User user = new User(); 
				user.setUsername(rs.getString(2));
				user.setPassword(rs.getString(3));
				userlist.add(user);
			}

		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();

		}
		return userlist;
	}

	public User getUser(String username, String password) { 
		User user = new User();
		ResultSet rs = null;
		PreparedStatement ps = null;
		Connection conn = null;
		try {
			conn = JdbcUtils.getConn();
			String sql = "select * from user where username=?
 and password=? ";
			/*
			 * String url =
			 * "jdbc:mysql://localhost:3306/struts2_4?
useUnicode=true&characterEncoding=UTF-8"
			 * ;
			 * 
			 * Class.forName("com.mysql.jdbc.Driver"); con =
			 * DriverManager.getConnection(url,"root","root");
			 */
			ps = conn.prepareStatement(sql);
			ps.setString(1, username);
			ps.setString(2, password);
			rs = ps.executeQuery();

			while (rs.next()) {
				user.setName(rs.getString(1));
				user.setUsername(rs.getString(2));
				user.setPassword(rs.getString(3));
			}

		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			JdbcUtils.free(rs, ps, conn);
		}
		return user;

	}

}

-----------------------------------------------------------------------------------------------------------

package com.sino.java.service;

import com.sino.java.been.User;

/**
 * @author Administrator
 *
 */
public interface UserService {

	public User login(String username,String password);
	
	public int reg(String name,String username,String password,String age,String sex);

	public void save(User user) throws Exception;

	//public DataGrid datagrid(User user);

	public void delete(String ids);

	public void update(User user) throws Exception;

	public void roleEdit(User user);

	public void editUserInfo(User user);

}

-----------------------------------------------------------------------------------------------

package com.sino.java.service.impl;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;

import com.opensymphony.xwork2.inject.Factory;
import com.sino.java.action.LoginAction;
import com.sino.java.been.User;
import com.sino.java.dao.UserDao;
import com.sino.java.dao.factory.DaoFactory;
import com.sino.java.dao.impl.UserDaoImpl;
import com.sino.java.service.UserService;

public class UserServiceImpl implements UserService{
	private static final Logger log = Logger.getLogger(UserServiceImpl.class);
	UserDao userDao = new UserDaoImpl();
 
	@Override
	public User login(String username,String password) {
		// TODO Auto-generated method stub
		User user =  userDao.getUser(username,password);
		return user; 
	}
	
	@Override
	 public int reg(String name, String username, String password, String age, String sex) {
		User user = new User();
		user.setName(name);
		user.setUsername(username);
		user.setPassword(password);
		user.setAge(age);
		user.setSex(sex);
		return userDao.insert(user); 
	}

	@Override
	public void save(User user) throws Exception {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void delete(String ids) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void update(User user) throws Exception {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void roleEdit(User user) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void editUserInfo(User user) {
		// TODO Auto-generated method stub
		
	}
}

---------------------------------------------------------------------------------------------------------

package com.sino.java.utils;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

import org.apache.log4j.Logger;

import com.sino.java.dao.factory.DaoFactory;
import com.sino.java.dao.impl.UserDaoImpl;

// 该工具类不须要被继承
public final class JdbcUtils {
	private static String url = "";
	private static String user = "";
	private static String password = "";
	private static final Logger log = Logger.getLogger(UserDaoImpl.class);
	// 不同意被创建
	private JdbcUtils() {
	}

	static {
		try {
			Class.forName("com.mysql.jdbc.Driver");
			Properties prop = new Properties();
			// InputStream inStream = new FileInputStream(new
			// File("src/daoconfig.properties"));
			// 长处：文件不一定要和路径绑定。仅仅要文件从在于 ClassPath 中 就能够找得到
			InputStream inStream = DaoFactory.class.getClassLoader()
					.getResourceAsStream("config.properties");
			try {
				prop.load(inStream);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				log.info("load error");
				e.printStackTrace();
			}
			// 从配置文件里获得的 value 值 都是字符串(String) 
			 url  = prop.getProperty("url");
			 user = prop.getProperty("user");
			 password = prop.getProperty("password"); 
			Class.forName("com.mysql.jdbc.Driver");
			log.info("------------------url user password ------------");
			log.info(url);
			log.info(user);
			log.info(password);
		} catch (ClassNotFoundException e) {
			throw new ExceptionInInitializerError(e);
		}
	}

	public static Connection getConn() throws SQLException {
		return DriverManager.getConnection(url, user, password);
	}

	public static void free(ResultSet rs, Statement st, Connection conn) {
		try {
			if (rs != null)
				rs.close();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if (st != null)
					st.close();
			} catch (SQLException e) {
				e.printStackTrace();
			} finally {
				try {
					if (conn != null)
						conn.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
			}
		}
	}
	public static void main(String[] args) {
		log.info("test");
	}
}

项目源代码下载连接：点击下载

本人新手，假设发现问题也请留言不吝赐教，一起进步。