1.1 添加spring相关依赖(5.0.2.RELEASE)
spring-core
spring-beans
spring-context
spring-orm
spring-tx
spring-aspects
spring-web
1.2 添加mybatis相关依赖
mybatis核心:mybatis(3.4.5)
Mybatis分页:pagehelper(5.1.2)
1.3 spring整合mybatis(1.3.1)
mybatis-spring
1.4 添加dbcp2连接池
commons-dbcp2(2.1.1)
commons-pool2(2.4.3)
1.5 添加日志配置(2.9.1)
log4j-core
log4j-api
log4j-web
1.6 其他
junit(4.12)
javax.servlet-api(4.0.0)
lombok(1.18.2)
注:使用mybatis-generator插件,pom文件添加支持
文件如下
4.0.0
com.hyf
ssm
1.0-SNAPSHOT
war
ssm Maven Webapp
http://www.example.com
UTF-8
1.8
1.8
3.7.0
5.0.2.RELEASE
3.4.5
5.1.44
5.1.2
1.3.1
2.1.1
2.4.3
2.9.1
4.12
4.0.0
1.18.2
org.springframework
spring-context
${spring.version}
org.springframework
spring-orm
${spring.version}
org.springframework
spring-tx
${spring.version}
org.springframework
spring-aspects
${spring.version}
org.springframework
spring-web
${spring.version}
org.springframework
spring-test
${spring.version}
org.mybatis
mybatis
${mybatis.version}
mysql
mysql-connector-java
${mysql.version}
com.github.pagehelper
pagehelper
${pagehelper.version}
org.mybatis
mybatis-spring
${mybatis.spring.version}
org.apache.commons
commons-dbcp2
${commons.dbcp2.version}
org.apache.commons
commons-pool2
${commons.pool2.version}
org.apache.logging.log4j
log4j-core
${log4j2.version}
org.apache.logging.log4j
log4j-api
${log4j2.version}
org.apache.logging.log4j
log4j-web
${log4j2.version}
junit
junit
${junit.version}
test
javax.servlet
javax.servlet-api
${servlet.version}
provided
org.projectlombok
lombok
${lombok.version}
provided
ssm
src/main/java
**/*.xml
src/main/resources
jdbc.properties
*.xml
org.apache.maven.plugins
maven-compiler-plugin
${maven.compiler.plugin.version}
${maven.compiler.target}
${project.build.sourceEncoding}
org.mybatis.generator
mybatis-generator-maven-plugin
1.3.2
mysql
mysql-connector-java
${mysql.version}
true
maven-clean-plugin
3.1.0
maven-resources-plugin
3.0.2
maven-compiler-plugin
3.8.0
maven-surefire-plugin
2.22.1
maven-war-plugin
3.2.2
maven-install-plugin
2.5.2
maven-deploy-plugin
2.8.2
2.1 applicationContext.xml
spirng核心配置文件,引入文件
2.2applicationContext-mybatis.xml
helperDialect=mysql
2.3注解式开发
@Repository:将DAO类声明为Bean
@Service:通常作用在业务层
@Constroller:通常作用在控制层,将在Spring MVC中使用
@Component:是一个泛化的概念,仅仅表示spring中的一个组件(Bean),可以作用在任何层次
@Scope:模式声明(singleton|prototype)
@Autowired:将自动在代码上下文与其匹配(默认是类型匹配)的Bean,并自动注入到相应的地方
@Resource:
1)@Resource后面没有任何内容,默认通过name属性去匹配bean,找不到再按type去匹配
2)指定了name或者type则根据指定的类型去匹配bean
3)指定了name和type则根据指定的name和type去匹配bean,任何一个不匹配都将报错
问题:@Autowired和@Resource两个注解的区别:
1)@Autowired默认按照byType方式进行bean匹配,@Resource默认按照byName方式进行bean匹配
2)@Autowired是Spring的注解,@Resource是J2EE的注解,这个看一下导入注解的时候这两个注解的包名就一清二楚了
Spring属于第三方的,J2EE是Java自己的东西,因此,建议使用@Resource注解,以减少代码和Spring之间的耦合。
@Transactional
2.4 jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/tb_student?useUnicode=true&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=123
2.5 log4j2.xml
/root/workspace/lucenedemo/logs
/root/workspace/lucenedemo/logs/error
/root/workspace/lucenedemo/logs/warn
%d{yyyy-MM-dd HH:mm:ss.SSS} [%t-%L] %-5level %logger{36} - %msg%n
实体类Model ——Book.java
set/get/toString 方法省略—
package com.hyf.ssm.model;
public class Book {
private Integer bid;
private String bname;
private Float price;
}
Mapper dao层——BookMapper.java
@Repository 将DAO类声明为Bean
package com.hyf.ssm.mapper;
import com.hyf.ssm.model.Book;
import org.springframework.stereotype.Repository;
import java.util.List;
import java.util.Map;
@Repository
public interface BookMapper {
// 通过Id进行删除
int deleteByPrimaryKey(Integer bid);
// 通过Id查询一条数据
Book selectByPrimaryKey(Integer bid);
}
BookMapper.xml
bid, bname, price
delete from t_mvc_book
where bid = #{bid,jdbcType=INTEGER}
接口Server ——BookServer
package com.hyf.ssm.service;
import com.hyf.ssm.model.Book;
import com.hyf.ssm.utils.PageBean;
import java.util.List;
import java.util.Map;
/**
* @author xhy
* @site www.4399.com
* @company xxx公司
* @create 2019-11-17 11:48
*/
public interface BookService {
int deleteByPrimaryKey(Integer bid);
Book selectByPrimaryKey(Integer bid);
}
实现类——BookServerImpl.java
@Service 通常作用在业务层
@Autowired Autowired默认按照byType方式进行bean匹配
package com.hyf.ssm.service.impl;
import com.hyf.ssm.mapper.BookMapper;
import com.hyf.ssm.model.Book;
import com.hyf.ssm.service.BookService;
import com.hyf.ssm.utils.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
import java.util.Map;
/**
* @author xhy
* @site www.4399.com
* @company xxx公司
* @create 2019-11-17 11:49
*/
@Service
public class BookServiceImpl implements BookService {
@Autowired
private BookMapper bookMapper;
public BookMapper getBookMapper() {
return bookMapper;
}
public void setBookMapper(BookMapper bookMapper) {
this.bookMapper = bookMapper;
}
@Override
public int deleteByPrimaryKey(Integer bid) {
return this.bookMapper.deleteByPrimaryKey(bid);
}
@Override
public Book selectByPrimaryKey(Integer bid) {
return this.bookMapper.selectByPrimaryKey(bid);
}
}
Spring Test+junit完美组合
在工程的pom文件中增加spring-test的依赖
org.springframework
spring-test
${spring.version}
创建SpringBaseTest ,并在该类上加上两个注解
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={“classpath:applicationContext.xml”})
package com.hyf.ssm;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
/**
* @author xhy
* @site www.4399.com
* @company xxx公司
* @create 2019-11-17 12:06
*/
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:applicationContext.xml"})
public class SpringBaseTest {
}
继承 SpringBaseTest ——BookServiceImplTest.java
如果不继承的话所用 就不能注解@Autowired
package com.hyf.ssm.service.impl;
import com.hyf.ssm.SpringBaseTest;
import com.hyf.ssm.service.BookService;
import com.hyf.ssm.utils.PageBean;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import java.util.HashMap;
import java.util.Map;
/**
* @author xhy
* @site www.4399.com
* @company xxx公司
* @create 2019-11-17 12:09
*/
public class BookServiceImplTest extends SpringBaseTest {
@Autowired
private BookService bookService;
@Test
public void deleteByPrimaryKey() {
this.bookService.deleteByPrimaryKey(55);
}
@Test
public void selectByPrimaryKey() {
System.out.println(this.bookService.selectByPrimaryKey(12));
}
}
查出来值,整合完毕
pom 依赖
上方已导入
注意:记得开动态代理
使用AOP编程解决分页代码重复的问题
@Around(“execution(* *…*Service.*Pager(…))”)
public Object invoke(ProceedingJoinPoint args)
语法结构:execution(方法修饰符 方法返回值 方法所属类 匹配方法名 ( 方法中的形参表 ) 方法申明抛出的异常 )
“*” :代表一个任意类型的参数;
“…”:代表零个或多个任意类型的参数。
切面的分页类
package com.hyf.ssm.aspect;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.hyf.ssm.utils.PageBean;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;
import java.util.List;
/**
* @author xhy
* @site www.4399.com
* @company xxx公司
* @create 2019-11-17 18:45
*/
@Component
@Aspect // 定义切面
public class PagerAspect {
@Around("execution(* *..*Service.*Pager(..))")
public Object invoke(ProceedingJoinPoint joinPoint) throws Throwable{
// 获取目标对象方法的参数集合
Object[] args = joinPoint.getArgs();
PageBean pageBean = null;
for (Object arg :args){
System.out.println(arg);
if(arg instanceof PageBean){
pageBean = (PageBean) arg;
break;
}
}
if(pageBean != null && pageBean.isPagination()){
PageHelper.startPage(pageBean.getPage(),pageBean.getRows());
}
Object proceed = joinPoint.proceed(args);
if(pageBean != null && pageBean.isPagination()){
PageInfo pageInfo = new PageInfo((List)proceed);
pageBean.setTotal(pageInfo.getTotal()+"");
}
return proceed;
}
}
Boojmapper
List
Boojmapper.xml
@Override
public List
BookServiceImplTest.java
@Test
public void listPage() {
Map m = new HashMap();
m.put("bname","圣墟");
PageBean pageBean = new PageBean();
pageBean.setPage(3);
for (Map map : this.bookService.listPager(m, pageBean)) {
System.out.println(map);
}
System.out.println("pageBean :"+pageBean);
}
控制台输出