SSM整合(Spring、SpringMVC、Mybatis)
SSM整合
為什麼整合?方便web的開發
Spring:管理我們在專案中的物件,比如service、dao、工具類物件。
SpringMVC:主要做web應用的開發,接收請求,返回處理結果。
Mybatis:完成資料庫的操作,完成資料庫的增刪改查。
以註解方式為主,配置檔案為輔。
SSM : 一個容器, SpringMVC容器管理整個專案中的所有物件。
SSM: SSM整合開發,在一個專案中使用springmvc + spring + mybatis
SSM 也有的叫SSI(IBatis)
SSM整合的思路:把檢視層的物件交給SpringMVC容器管理, 把Service和Dao層物件交給Spring容器管理
把檢視層的物件定義在SpringMVC的配置檔案中:
1.處理器物件, 使用註解@Controller建立, 宣告元件掃描器
2.檢視解析器
3.註解驅動mvc:annotation-driven
把Service和Dao物件定義Spring的配置檔案中:
1.Service層物件,使用註解@Service, 宣告元件掃描器
2.資料來源DataSource(druid, dbcp)
3.SqlSesisonFactory
4.MyBatis的動態代理技術,建立Dao物件
5.工具類和其他類
SpringMVC容器和Spring容器的關係:在理解上, SpringMVC容器是Spring容器的子容器,
那麼在子容器中可以訪問父容器中的物件,也就是Controller可以Service,
反過來Service不能Controller。
SpringMVC容器和Spring容器關係的建立是通過SpringMVC容器物件中的屬性 parent實現的。
parent屬性值是Spring的容器物件。
SpringMVC – parent – Spring
SSM整合的步驟:
1.使用springdb的資料庫, student表
2.新建的web應用
匯入jar:
1)spring的核心jar:spring-beans.jar,spring-core.jar,spring-context.jar,spring-expression.jar
2)spring-aop.jar
3)資料庫和事務相關的:spring-jdbc.jar,spring-tx.jar
4)web相關的jar:spring-web.jar, spring-webmvc.jar
5)mybatis的核心jar:mybatis-3.4.5.jar
6)mybatis和spring整合的jar: mybatis-spring-1.3.1.jar
7)資料庫的連線池 druid.jar
8) mysql的驅動,日誌commons-logging.jar , log4j.jar
9)json的工具庫jar:Jackson
3.修改web.xml
1)註冊Spring的監聽器,ContextLoaderListener, 建立spring的容器物件。 載入spring的配置檔案
2)註冊SpringMVC的中央排程器,建立SpringMVC的容器物件,加入SpringMVC配置檔案
3)註冊字符集過濾器,解決post請求亂碼的問題
4.定義程式中包的結構, 實體beans, Dao包, Service包, Controller包
5.編寫配置檔案
1)springmvc的配置檔案
2)spring的配置檔案
3)定義資料庫的屬性配置檔案
4)mybatis主配置檔案
6.編寫程式碼:定義實體類, Dao介面和sql對映檔案, Service介面和實現類, Controller類
7.定義檢視檔案(jsp)
/*web.xml/
<?xml version="1.0" encoding="UTF-8"?> 25-SSM index.html index.htm index.jsp default.html default.htm default.jsp contextConfigLocation classpath:conf/applicationContext.xml org.springframework.web.context.ContextLoaderListener dispatcherServlet org.springframework.web.servlet.DispatcherServlet contextConfigLocation classpath:conf/dispatcherServlet.xml 1 dispatcherServlet *.do characterEncodingFilter org.springframework.web.filter.CharacterEncodingFilter encoding utf-8 forceRequestEncoding true forceResponseEncoding true characterEncodingFilter /*/SpringMVC的配置檔案/
<?xml version="1.0" encoding="UTF-8"?><!-- springmvc的配置檔案 -->
<!-- 宣告元件掃描器,指定Controller註解所在的包名 -->
<context:component-scan base-package="com.bjpowernode.controllers" />
<!-- 宣告檢視解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- 宣告註解驅動 -->
<mvc:annotation-driven />
/**Spring的配置檔案**/
<?xml version="1.0" encoding="UTF-8"?>
<!-- spring的配置檔案: Dao物件,Service物件,其他的工具類物件 -->
<!-- 宣告元件掃描器,指定@Service註解所在的包名 -->
<context:component-scan base-package="com.bjpowernode.service" />
<context:property-placeholder location="classpath:conf/jdbc.properties"/>
<!-- 宣告資料來源(druid,dbcp) -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</bean>
<!-- 宣告SqlSessionFactoryBean,建立SqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:conf/mybatis.xml" />
</bean>
<!-- 宣告MyBatis的掃描器, 建立Dao介面的實現類物件 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
<property name="basePackage" value="com.bjpowernode.dao" />
</bean>
/jdbc.properties/
jdbc.url=jdbc:mysql://localhost:3306/springdb
jdbc.username=root
jdbc.password=root
/mybatis.xml*/
<?xml version="1.0" encoding="UTF-8" ?><!-- 配置別名 -->
<typeAliases>
<package name="com.bjpowernode.beans"/>
</typeAliases>
<!-- 配置sql對映檔案 -->
<mappers>
<package name="com.bjpowernode.dao"/>
</mappers>
/beans*/
package com.bjpowernode.beans;
public class Student {
private Integer id;
private String name;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
}
}
/*controllers/
package com.bjpowernode.controllers;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping(“jump”)
public class JumpController {
/**
* 定義處理器方法,跳轉到一個檢視頁面
*/
@RequestMapping("tojsp.do")
public String toJsp(String target){
return target; //邏輯名稱
}
}
package com.bjpowernode.controllers;
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import com.bjpowernode.beans.Student;
import com.bjpowernode.service.StudentService;
@Controller
@RequestMapping(“student”)
public class StudentController {
/**
* 引用型別 @Autowired ,@Resource
* byName, byType
*/
//byType
@Autowired
private StudentService studentService;
//學生的註冊,新增功能
@RequestMapping("addStudent.do")
public ModelAndView addStudent(Student student){
ModelAndView mv = new ModelAndView();
//呼叫Service處理註冊功能
int rows = studentService.addStudent(student);
if( rows > 0 ){
mv.addObject("msg", "註冊成功!!!");
mv.setViewName("success");
} else {
mv.addObject("msg", "註冊失敗!!!");
mv.setViewName("fail");
}
return mv;
}
//查詢學生
@ResponseBody
@RequestMapping("queryStudent.do")
public List<Student> queryStudents(){
List<Student> students = studentService.queryStudents();
//對查詢結果做處理
if( students == null ){
students = new ArrayList<>();
}
return students; // [{},{}] []
}
}
/dao*/
package com.bjpowernode.dao;
import java.util.List;
import com.bjpowernode.beans.Student;
public interface StudentDao {
int insertStudent(Student student);
List<Student> selectStudents();
}
<?xml version="1.0" encoding="UTF-8" ?> insert into student(name,age) values(#{name},#{age})<select id="selectStudents" resultType="Student">
select id,name,age from student order by id desc
</select>
/service*/
package com.bjpowernode.service;
import java.util.List;
import com.bjpowernode.beans.Student;
public interface StudentService {
int addStudent(Student student);
List<Student> queryStudents();
}
package com.bjpowernode.service.impl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.bjpowernode.beans.Student;
import com.bjpowernode.dao.StudentDao;
import com.bjpowernode.service.StudentService;
@Service
public class StudentServiceImpl implements StudentService {
/**
* 引用型別 @Autowired ,@Resource
* byName, byType
*/
//byType
@Autowired
private StudentDao stuDao;
@Override
public int addStudent(Student student) {
int rows = stuDao.insertStudent(student);
return rows;
}
@Override
public List<Student> queryStudents() {
List<Student> students = stuDao.selectStudents();
return students;
}
}
/*addStudent.jsp/
<%@ page language=“java” contentType=“text/html; charset=UTF-8”
pageEncoding=“UTF-8”%>
addStudent.jsp
<tr>
<td>年齡:</td>
<td><input type="text" name="age" /></td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="註冊功能" /></td>
</tr>
</table>
</form>
姓名: |
/success.jsp*/
<%@ page language=“java” contentType=“text/html; charset=UTF-8”
pageEncoding=“UTF-8”%>
/*index.jsp/
<%@ page language=“java” contentType=“text/html; charset=UTF-8”
pageEncoding=“UTF-8”%>
SSM整合的例子
學生註冊 | 學生瀏覽 |
${pageContext.request.contextPath }在jsp中相當於base標籤