Struts2 + Hibernate3.3 开发简单的登录注册功能【J2EE】

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开发环境：

IDE：Myeclipse10.0

数据库：Oracle（SQL Developer）

Web容器：Tomcat 7.0

JDK：1.6

Struts：2.0

Hibernate：3.3

数据库：（ID为主键，设置了序列以及触发器SEQUENCE_ID，使得ID自增）

注意事项：

创建项目以后，为项目添加Sturts和Hibernate能力

连接数据库并生成POJO类：Hibernate框架连接SQL sever 2016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

编码步骤：

使用hibernate框架生成数据实体POJO类，即该项目中的Userinfo类
编写逻辑层UserDAO类
编写控制层Action类，分为登录Action和注册Action
编写视图层JSP，分为登录界面和注册页面，以及登录、注册成功后通通跳转到成功界面
编写struts.xml，分为两个action，因为有两张form表单要填写以对应跳转不同的视图

POJO类：Userinfo.java

package com.ov;/**
* Userinfo entity. @author MyEclipse Persistence Tools
*/public class Userinfo implements java.io.Serializable { // Fields private Integer id;
private String username;
private String password;
private String repassword; // Constructors /** default constructor */
public Userinfo() {
} /** full constructor */
public Userinfo(String username, String password, String repassword) {
this.username = username;
this.password = password;
this.repassword = repassword;
} // Property accessors public Integer getId() {
return this.id;
} public void setId(Integer id) {
this.id = id;
} public String getUsername() {
return this.username;
} public void setUsername(String username) {
this.username = username;
} public String getPassword() {
return this.password;
} public void setPassword(String password) {
this.password = password;
} public String getRepassword() {
return this.repassword;
} public void setRepassword(String repassword) {
this.repassword = repassword;
}}

自动生成的Userinfo.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
<class name="com.ov.Userinfo" table="USERINFO" schema="SYSTEM">
<id name="id" type="java.lang.Integer">
<column name="ID" precision="9" scale="0" />
<generator class="sequence">
<param name="sequence">SEQUENCE_ID</param>
</generator>
</id>
<property name="username" type="java.lang.String">
<column name="USERNAME" length="50" />
</property>
<property name="password" type="java.lang.String">
<column name="PASSWORD" length="50" />
</property>
<property name="repassword" type="java.lang.String">
<column name="REPASSWORD" length="50" />
</property>
</class>
</hibernate-mapping>

UserDAO.java

package com.dao;import java.util.List;import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;import com.ov.Userinfo;
import com.util.HibernateSessionFactory;public class UserDAO {
private Session session;
private Transaction t;
//获取session连接
public void getCurrentSession() {
session = HibernateSessionFactory.getSession();
}
//关闭session连接
public void closeSession() {
if(session != null){
HibernateSessionFactory.closeSession();
}
} /**
* 登录：验证用户名和密码
* @param user
* @return true 存在
* @return false 不存在
*/
public boolean loginByUser(String username,String password){
getCurrentSession();
t = session.beginTransaction();
Query query = session.createQuery("from Userinfo where username='"+username+"' and password='"+password+"'");
List list = query.list();
closeSession();
if(list!=null && list.size()>0) { //存在用户名和密码
return true;
}
return false;
} /**
* 注册：先查询表中是否存在相同用户名，若无则增加，有则提示
* @param userinfo
* @return true 成功
* @return false 失败
*/
public boolean registByUser(Userinfo userinfo) {
try{
getCurrentSession();
t = session.beginTransaction();
String username = userinfo.getUsername();
String password = userinfo.getPassword();
String repassword = userinfo.getRepassword();
Query query = session.createQuery("from Userinfo where username='"+username+"'");
//query.setString(0, username);
List list = query.list();
if(list.size()>0){ //如果表中已经有相同的用户名
return false;
}
else{
session.save(userinfo);
t.commit();
return true;
}
}catch (Exception e) {
e.printStackTrace();
}
finally{
closeSession();
}
return false;
}
}

LoginAction.java

package com.action;import java.util.Map;import org.hibernate.Session;import com.dao.UserDAO;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.ov.Userinfo;public class LoginAction extends ActionSupport {
private String username;
private String password;
private String msg;//用于显示错误信息
/**
* 处理用户请求的execute方法
*/
public String execute() throws Exception {
//获得会话，用来保存当前登录用户的信息！
Map<String,Object> session = ActionContext.getContext().getSession();
Userinfo userinfo = new Userinfo();
userinfo.setUsername(username);
userinfo.setPassword(password);
session.put("userinfo", userinfo);
return SUCCESS;
} public void validate() {
if(username==null || username.equals("")){
this.addFieldError("username", "用户名不能为空！");
}
else if(password==null || password.equals("")){
this.addFieldError("password", "密码不能为空！");
}
else{
UserDAO dao = new UserDAO();
if(dao.loginByUser(username,password) == false){
this.addFieldError("username", "用户名或密码错误！");
}
}
} 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;
} public String getMsg() {
return msg;
} public void setMsg(String msg) {
this.msg = msg;
}}

RegistAction.java

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">

<action name="loginAction" class="com.action.LoginAction">
<result name="success">/success.jsp</result>
<result name="input">/index.jsp</result>
</action>

<action name="registAction" class="com.action.RegistAction">
<result name="success">/success.jsp</result>
<result name="input">/register.jsp</result>
</action>
</package>
</struts>

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<%
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>
<title>主页</title>
</head> <body>
<s:form action="loginAction" method="post">
<s:fielderror><s:property value="msg"/></s:fielderror>
<s:textfield label="用户名" name="username"/>
<s:password label="密码" name="password"/>
<s:a href="register.jsp">注册</s:a>
<s:submit value="登录"/>
</s:form>
</body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<%
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>主页</title>
</head> <body>
<s:form action="registAction" method="post">
<s:fielderror><s:property value="msg"/></s:fielderror><br>
<s:textfield label="用户名" name="username"/>
<s:password label="密码" name="password"/>
<s:password label="确认密码" name="repassword"/>
<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"%>
<%
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>主页</title>
</head> <body>
<s:set name="userinfo" value="#session['userinfo']"></s:set>
<s:property value="#userinfo.username"/>，您好！
</body>
</html>