JavaEE小项目：Struts2+Hibernate实现完整的注册和登录功能（数据校验）

前期准备

新建一个Java Project 取名为HibernateDemo2
添加Sturts和Hibernate框架 架构起来

连接数据库并生成POJO类：Hibernate框架连接MySQL ( 使用Navicat ) 完整详细步骤

还有一个一定会出错的地方，因为Hibernate和Struts 2 中有相同的包（版本不同）会引起冲突，所以要把Struts 2 中的antlr-2.7.2.jar移除
具体操作可以看这篇：java.lang.NoSuchMethodError: antlr.collections.AST.getLine()I最终解决方案

最终项目结构

LoginAction.java

package org.action;

import java.util.Map;

import org.dao.UserInfoDao;
import org.vo.UserInfo;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport{
    private UserInfo userInfo;
    private String message;  //用于显示验证错误信息

    /**
     *  处理用户请求的 execute 方法
     *  因为此函数在 validate()后执行，所以可以保证用户名和密码正确
     *  @return SUCCESS 
     */
    public String execute() throws Exception{
        Map<String,Object> session = ActionContext.getContext().getSession();
        session.put("userInfo", userInfo);
        return SUCCESS;
    }

    /**
     *  验证用户名和密码
     *  先判断是否为空，再验证
     */
    public void validate(){
        if(userInfo.getUserAccount()==null || userInfo.getUserAccount().equals(""))
            this.addFieldError("userAccount", "用户名不能为空");
        else if(userInfo.getUserPassword()==null || userInfo.getUserPassword().equals(""))
            this.addFieldError("userPassword", "密码不能为空");
        else {
            UserInfoDao dao = new UserInfoDao();
            if(dao.loginByUserInfo(userInfo)==false)
                this.addFieldError("userAccount", "用户名或密码错误");
        }
    }

    //自动生成的getter和setter
    public UserInfo getUserInfo() {
        return userInfo;
    }
    public void setUserInfo(UserInfo userInfo) {
        this.userInfo = userInfo;
    }
    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }
}

RegisterAction.java

package org.action;

import java.util.Map;

import org.dao.UserInfoDao;
import org.vo.UserInfo;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class RegisterAction extends ActionSupport{

    private String userAccount;
    private String userPassword;
    private String rePassword;
    private String message;  //用于显示验证错误信息

    /**
     *  处理用户请求的 execute 方法
     *  因为此函数在 validate()后执行，所以可以保证用户名和密码正确
     *  @return SUCCESS 
     */
    public String execute() throws Exception{
        Map<String,Object> session = ActionContext.getContext().getSession();
        UserInfo vo = new UserInfo();
        vo.setUserAccount(userAccount);
        vo.setUserPassword(userPassword);
        session.put("userInfo", vo);
        return SUCCESS;
    }

    /**
     *  先验证用户名和密码是否为空
     *  再验证进行插入操作
     */
    public void validate(){
        if(userAccount==null||userAccount.equals("")){
            this.addFieldError("userAccount", "用户名不能为空");
        }else if(userPassword==null||userPassword.equals("")){
            this.addFieldError("userPassword", "密码不能为空");
        }else if(userPassword.equals(rePassword)==false){
            this.addFieldError("rePassword", "两次密码必须一致");
        }else{
            UserInfoDao dao = new UserInfoDao();
            UserInfo vo = new UserInfo();
            vo.setUserAccount(userAccount);
            vo.setUserPassword(userPassword);
            if(dao.registerByUserInfo(vo)==false){
                this.addFieldError("userAccount", "对不起！该用户名已被注册");
            }
        }
    }

    //自动生成的getter和setter
    public String getUserAccount() {
        return userAccount;
    }

    public void setUserAccount(String userAccount) {
        this.userAccount = userAccount;
    }

    public String getUserPassword() {
        return userPassword;
    }

    public void setUserPassword(String userPassword) {
        this.userPassword = userPassword;
    }

    public String getRePassword() {
        return rePassword;
    }

    public void setRePassword(String rePassword) {
        this.rePassword = rePassword;
    }
    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }
}

UserInfoDao.java

package org.dao;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.util.HibernateSessionFactory;
import org.vo.UserInfo;

public class UserInfoDao {
    private Session session;
    private Transaction t;
    
   public static  void main(String[] args){
	   UserInfoDao dao=new UserInfoDao();
	   dao.getCurrentSession();
	   UserInfo dto=new UserInfo();
	   dto.setUserAccount("chocolate");
	   dto.setUserPassword("123");
	   boolean res=dao.registerByUserInfo(dto);
	   System.out.println("结果---------------"+res);
	   
			 
   }
    
    public void getCurrentSession(){
        session=HibernateSessionFactory.getSession();
    }

    public void closeSession(){
        if(session!=null){
            HibernateSessionFactory.closeSession();
        }
    }
    /**
     * 登录函数：验证用户名和密码
     * @param vo
     * @return true 存在
     * @return false 不存在
     */

    public boolean loginByUserInfo(UserInfo vo){
        getCurrentSession();
        t=session.beginTransaction();
        String userAccount = vo.getUserAccount();
        String userPassword = vo.getUserPassword();
        Query query = session.createQuery("from UserInfo where userAccount='"+userAccount+"' and userPassword='"+userPassword+"'");
        List list=query.list();
        t.commit();
        closeSession();
        if(list.size()>0)
            return true;
        return false;
    }

    /**
     * 注册函数：先查询表中是否已经存在相同的用户名，再进行插入操作
     * @param vo
     * @return true 注册成功
     * @return false 注册失败
     */
    public boolean registerByUserInfo(UserInfo vo){
        getCurrentSession();
        t=session.beginTransaction();
        String userAccount = vo.getUserAccount();

        Query query = session.createQuery("from UserInfo where userAccount='"+userAccount+"'");
        List list = query.list();
        if(list.size()>0){//如果表中已经有相同的用户名
        	 t.commit();
            closeSession();
            return false;
        }else{
            session.save(vo);
            t.commit();
            closeSession();
            return true;
        }
    }
}

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
    <package name="default" extends="struts-default">
    <!-- 用户登录 -->
    <action name="loginAction" class="org.action.LoginAction">
        <result name="success">/success.jsp</result>
        <result name="input">/login.jsp</result>
    </action>
    <!-- 用户注册 -->
    <action name="registerAction" class="org.action.RegisterAction">
        <result name="success">/success.jsp</result>
        <result name="input">/register.jsp</result>
    </action>
    </package>
</struts>    

login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
  <head>
  <title>login.jsp</title>
  </head>

  <body>
    <s:form action="loginAction" method="post" theme="simple">
        <s:fielderror><s:property value="message"/></s:fielderror><br>
        用户名：<s:textfield name="userInfo.userAccount"/><br>
        密码：<s:password name="userInfo.userPassword"/><br>
        <s:submit value="登录"/><s:reset value="重置"/>
    </s:form>
  </body>
</html>

register.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
  <head>
  <title>register.jsp</title>
  </head>

  <body>
    <s:form action="registerAction" method="post" theme="simple">
    <s:fielderror><s:property value="message"/></s:fielderror><br>
        用户名:<s:textfield name="userAccount" /><br>
        密码:<s:password name="userPassword" /><br>
        重复密码:<s:password name="rePassword"/><br>
        <s:submit value="提交"/><s:reset value="重置"/>
    </s:form>
  </body>
</html>

success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
  <head>
  <title>success.jsp</title>
  </head>

  <body>
    <s:set name="userInfo" value="#session['userInfo']"/>
    <s:property value="#userInfo.userAccount"/>,你好！
  </body>
</html>

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