Spring是一个开源框架，Spring是于2003 年兴起的一个轻量级的Java 开发框架，由Rod Johnson 在其著作Expert One-On-One J2EE Development and Design中阐述的部分理念和原型衍生而来。它是为了解决企业应用开发的复杂性而创建的。Spring使用基本的JavaBean来完成以前只可能由EJB完成的事情。然而，Spring的用途不仅限于服务器端的开发。从简单性、可测试性和松耦合的角度而言，任何Java应用都可以从Spring中受益。 简单来说，Spring是一个轻量级的控制反转（IoC）和面向切面（AOP）的容器框架。
SpringMVC
Spring MVC属于SpringFrameWork的后续产品，已经融合在Spring Web Flow里面。Spring MVC 分离了控制器、模型对象、分派器以及处理程序对象的角色，这种分离让它们更容易进行定制。
MyBatis
MyBatis 本是apache的一个开源项目iBatis, 2010年这个项目由apache software foundation 迁移到了google code，并且改名为MyBatis 。MyBatis是一个基于Java的持久层框架。iBATIS提供的持久层框架包括SQL Maps和Data Access Objects（DAO）MyBatis 消除了几乎所有的JDBC代码和参数的手工设置以及结果集的检索。MyBatis 使用简单的 XML或注解用于配置和原始映射，将接口和 Java 的POJOs（Plain Old Java Objects，普通的 Java对象）映射成数据库中的记录。
DROP TABLE IF EXISTS `user_t`;
CREATE TABLE `user_t` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`user_name` varchar(40) NOT NULL,
`password` varchar(255) NOT NULL,
`age` int(4) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
/*Data for the table `user_t` */
insert into `user_t`(`id`,`user_name`,`password`,`age`) values (1,'测试','sfasgfaf',24);
package com.qcb.entitys;
public class User {
private Integer id;
private String userName;
private String password;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName == null ? null : userName.trim();
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
UserMapper.java
import com.qcb.entitys.User;
public interface UserMapper {
int deleteByPrimaryKey(Integer id);
int insert(User record);
int insertSelective(User record);
User selectByPrimaryKey(Integer id);
int updateByPrimaryKeySelective(User record);
int updateByPrimaryKey(User record);
}
UserMapper.xml
id, user_name, password, age
delete from user_t
where id = #{id,jdbcType=INTEGER}
insert into user_t (id, user_name, password,
age)
values (#{id,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},
#{age,jdbcType=INTEGER})
insert into user_t
id,
user_name,
password,
age,
#{id,jdbcType=INTEGER},
#{userName,jdbcType=VARCHAR},
#{password,jdbcType=VARCHAR},
#{age,jdbcType=INTEGER},
update user_t
user_name = #{userName,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR},
age = #{age,jdbcType=INTEGER},
where id = #{id,jdbcType=INTEGER}
update user_t
set user_name = #{userName,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR},
age = #{age,jdbcType=INTEGER}
where id = #{id,jdbcType=INTEGER}
建立Service接口和实现类
我们给出这两个文件的代码:
UserService.java
package com.qcb.services;
import com.qcb.entitys.User;
public interface IUserService {
public User getUserById(int userId);
}
UserServiceImpl.java
package com.qcb.serviceimpl;
import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import com.qcb.dao.UserMapper;
import com.qcb.entitys.User;
import com.qcb.services.IUserService;
@Service("userService")
public class UserServiceImpl implements IUserService {
@Resource
private UserMapper userDao;
@Override
public User getUserById(int userId) {
System.out.println(111);
System.out.println(userId);
// TODO Auto-generated method stub
return this.userDao.selectByPrimaryKey(userId);
}
}
实现Controller对前后台数据交互的处理:
Mycontroller.java
package com.qcb.controllers;
import javax.annotation.Resource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import com.qcb.entitys.User;
import com.qcb.serviceimpl.UserServiceImpl;
import com.qcb.services.IUserService;
@Controller
public class Mycontroller {
@Resource
private IUserService userService;
@RequestMapping(value ="views/hello",method ={RequestMethod.GET})
public ModelAndView hello(String id){
System.out.println("0123");
int userId = Integer.parseInt(id);
User user = this.userService.getUserById(userId);
ModelAndView mv = new ModelAndView();
System.out.println("1234");
System.out.println(user.getUserName());
mv.addObject("message","ooooooooooooooo");
mv.setViewName("NewFile");
return mv;
}
}
一直到这里,我们所有关于后端框架已经搭建完毕,我们写一个小jsp页面来显示一下:
NewFile.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
Insert title here
This article is from an interview with Zuhaib Siddique, a production engineer at HipChat, makers of group chat and IM for teams.
HipChat started in an unusual space, one you might not
*******网页请求后面必须加上?分隔符和参数id=1
这时候控制台输出我们从数据库拿到的信息 "测试"