架构的演变
架构的演变
一、两层架构(jsp+DB)
register.jsp
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
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>用户注册</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">
-->
</head>
<body>
<form method="post" action="registerDeal.jsp">
用户名：<input type="text" name="username"><br>
密码：<input type="password" name="password"><br>
确认密码：<input type="password" name="password2"><br>
<input type="submit" value="提交"/>
</form><br>
</body>
</html>
registerDeal.jsp
<%@ page language="java" import="java.util.*, java.sql.*" pageEncoding="GB18030"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
String username = request.getParameter("username");
String password = request.getParameter("password");
String password2 = request.getParameter("password2");
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/spring", "root", "bjsxt");
String sqlQuery = "select count(*) from user where username = ?";
PreparedStatement psQuery = conn.prepareStatement(sqlQuery);
psQuery.setString(1, username);
ResultSet rs = psQuery.executeQuery();
rs.next();
int count = rs.getInt(1);
if(count > 0) {
response.sendRedirect("registerFail.jsp");
psQuery.close();
conn.close();
return;
}
String sql = "insert into user values (null, ?, ?)";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, username);
ps.setString(2, password);
ps.executeUpdate();
ps.close();
conn.close();
response.sendRedirect("registerSuccess.jsp");
%>
二、三层架构（jsp+Entity/service+DB)
register.jsp
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
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>用户注册</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">
-->
</head>
<body>
<form method="post" action="registerDeal.jsp">
用户名：<input type="text" name="username"><br>
密码：<input type="password" name="password"><br>
确认密码：<input type="password" name="password2"><br>
<input type="submit" value="提交"/>
</form><br>
</body>
</html>
registerDeal.jsp
<%@ page language="java" import="java.util.*, java.sql.*" pageEncoding="GB18030"%>
<%@ page import="com.bjsxt.registration.service.*" %>
<%@ page import="com.bjsxt.registration.model.*" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
String username = request.getParameter("username");
String password = request.getParameter("password");
String password2 = request.getParameter("password2");
User u = new User();
u.setUsername(username);
u.setPassword(password);
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/spring", "root", "bjsxt");
UserManager um = new UserManager();
boolean exist = um.exists(u);
if(exist) {
response.sendRedirect("registerFail.jsp");
return;
}
um.add(u);
response.sendRedirect("registerSuccess.jsp");
%>
user.java
package com.bjsxt.registration.model;
import com.bjsxt.registration.service.UserManager;
//贫血模型 充血模型
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;
}
}
userManager.java
package com.bjsxt.registration.service;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import com.bjsxt.registration.model.User;
public class UserManager {
public boolean exists(User u) throws Exception {
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/spring", "root", "bjsxt");
String sqlQuery = "select count(*) from user where username = ?";
PreparedStatement psQuery = conn.prepareStatement(sqlQuery);
psQuery.setString(1, u.getUsername());
ResultSet rs = psQuery.executeQuery();
rs.next();
int count = rs.getInt(1);
psQuery.close();
conn.close();
if(count > 0) {
return true;
}
return false;
}
public void add(User u) throws Exception {
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/spring", "root", "bjsxt");
String sql = "insert into user values (null, ?, ?)";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, u.getUsername());
ps.setString(2, u.getPassword());
ps.executeUpdate();
ps.close();
conn.close();
}
}
三、三层架构（jsp+service+Hibernate）
registerDeal.jsp
<%@ page language="java" import="java.util.*, java.sql.*" pageEncoding="GB18030"%>
<%@ page import="com.bjsxt.registration.service.*" %>
<%@ page import="com.bjsxt.registration.model.*" %>
<%@ page import="com.bjsxt.registration.service.impl.*" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
String username = request.getParameter("username");
String password = request.getParameter("password");
String password2 = request.getParameter("password2");
UserManager um = new UserManagerImpl();
boolean exist = um.exists(u);
if(exist) {
response.sendRedirect("registerFail.jsp");
return;
}
um.add(u);
response.sendRedirect("registerSuccess.jsp");
%>
Service层：UserManager.java
package com.bjsxt.registration.service;
import com.bjsxt.registration.model.User;
public interface UserManager {
public abstract boolean exists(User u) throws Exception;
public abstract void add(User u) throws Exception;
}
UserManagerImpl.java
package com.bjsxt.registration.service.impl;
import com.bjsxt.registration.dao.UserDao;
import com.bjsxt.registration.dao.impl.UserDaoImpl;
import com.bjsxt.registration.model.User;
import com.bjsxt.registration.service.UserManager;
public class UserManagerImpl implements UserManager {
private UserDao userDao = new UserDaoImpl();
public UserDao getUserDao() {
return userDao;
}
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
/* (non-Javadoc)
* @see com.bjsxt.registration.service.impl.UserManager#exists(com.bjsxt.registration.model.User)
*/
public boolean exists(User u) throws Exception {
return userDao.checkUserExistsWithName(u.getUsername());
}
/* (non-Javadoc)
* @see com.bjsxt.registration.service.impl.UserManager#add(com.bjsxt.registration.model.User)
*/
public void add(User u) throws Exception {
userDao.save(u);
}
}
Dao层（Hibernate）：UserDao.java
package com.bjsxt.registration.dao;
import com.bjsxt.registration.model.User;
public interface UserDao {
public void save(User u);
public boolean checkUserExistsWithName(String username);
}
UserDaoImpl.java
package com.bjsxt.registration.dao.impl;
import org.hibernate.SessionFactory;
import org.hibernate.classic.Session;
import com.bjsxt.registration.dao.UserDao;
import com.bjsxt.registration.model.User;
import com.bjsxt.registration.util.HibernateUtil;
public class UserDaoImpl implements UserDao {
public void save(User u) {
SessionFactory sf = HibernateUtil.getSessionFactory();
Session s = sf.getCurrentSession();
s.beginTransaction();
s.save(u);
s.getTransaction().commit();
}
public boolean checkUserExistsWithName(String username) {
SessionFactory sf = HibernateUtil.getSessionFactory();
Session s = sf.getCurrentSession();
s.beginTransaction();
long count = (Long)s.createQuery("select count(*) from User u where u.username = :username")
.setString("username", username)
.uniqueResult();
s.getTransaction().commit();
if(count > 0) return true;
return false;
}
}
user.java(@Entity Hibernate注解)
package com.bjsxt.registration.model;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import com.bjsxt.registration.service.impl.UserManagerImpl;
//贫血模型 充血模型
@Entity
public class User {
private int id;
private String username;
private String password;
@Id
@GeneratedValue
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;
}
}
四、jsp+struts+Service+Hibernate
UserManager um = new UserManagerImpl();
boolean exist = um.exists(u);
if(exist) {
response.sendRedirect("registerFail.jsp");
return;
}
上面的代码被struts2给取代了
在struts2处理类Action里面：
1.spring通过
@Resource
private UserManager userManager ;
注入封装了UserDao的service处理类，在action里面直接调用处理类操作
2.struts.xml配置文件中的Result取代了上面的跳转
register.jap
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
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>用户注册</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">
-->
</head>
<body>
<form method="post" action="user.action">
用户名：<input type="text" name="username"><br>
密码：<input type="password" name="password"><br>
确认密码：<input type="password" name="password2"><br>
<input type="submit" value="提交"/>
</form><br>
</body>
</html>
UserAction.java
package com.bjsxt.registration.action;
import javax.annotation.Resource;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Scope;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Component;
import com.bjsxt.registration.model.User;
import com.bjsxt.registration.service.UserManager;
import com.opensymphony.xwork2.ActionSupport;
@Component("user")
@Scope("prototype")
public class UserAction extends ActionSupport {
private String username;
private String password;
private String password2;
private UserManager um;
public UserManager getUm() {
return um;
}
@Resource(name="userManager")
public void setUm(UserManager um) {
this.um = um;
}
@Override
public String execute() throws Exception {
User u = new User();
u.setUsername(username);
u.setPassword(password);
if(um.exists(u)) {
return "fail";
}
um.add(u);
return "success";
}
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 getPassword2() {
return password2;
}
public void setPassword2(String password2) {
this.password2 = password2;
}
}
五、jsp+struts+Hibernate+spring
spring把Dao注入到Daoimpl
Service注入到Serviceimpl
Dao注入到Service
Service注入到Action处理类
jsp页面*。action可以直接在action里面操作，跳转！