SpringBoot——项目搭建、整合Mybatis、整合redis（集群）
一、项目搭建
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cn.x5456</groupId>
<artifactId>springBootDemo</artifactId>
<version>1.0-SNAPSHOT</version>
<!--从这开始拷贝-->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.0.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
<!--mybatis整合SpringBoot的jar包。从这下面的暂时不拷-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>
<!-- 加入redis起步依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-redis</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.28</version>
</dependency>
</dependencies>
<!--到这结束-->
</project>
程序的主方法mySpringBootDemo.java
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* 扫描所有的类
* 并将当前类对象交给Spring管理
*/
@SpringBootApplication
public class mySpringBootDemo {
public static void main(String[] args) {
// 项目入口
SpringApplication.run(mySpringBootDemo.class,args);
}
}
Controller（返回的都是json格式数据）
package cn.x5456.controller;
import cn.x5456.pojo.User;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* rest风格的controller（返回json数据）
* 相当于@Controller+@ResponseBody注解
*/
@RestController
public class helloController {
/**
* 返回json格式数据
* @return
*/
@RequestMapping("hello")
public String hello(){
return "hello,world!";
}
/**
* 返回pojo
*/
@RequestMapping("pojo")
public User pojo(){
User u = new User();
u.setName("张三");
u.setAge(19);
return u;
}
/**
* 返回集合
*/
@RequestMapping("list")
public List<User> list(){
ArrayList<User> uList = new ArrayList<>();
User u1 = new User();
u1.setName("张三");
u1.setAge(19);
User u2 = new User();
u2.setName("李四");
u2.setAge(20);
uList.add(u1);
uList.add(u2);
return uList;
}
/**
* 返回map
*/
@RequestMapping("map")
public Map<String,Object> map(){
HashMap<String, Object> map = new HashMap<>();
map.put("a",1);
map.put("b",2);
return map;
}
}
二、SpringBoot与Mybatis整合
1）导入相关jar包
<!--mybatis整合SpringBoot的jar包-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
2）创建文件夹，并书写配置文件
sqlMapConfig.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!--虽然是空的，但必须有--> </configuration>
UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace="cn.x5456.mapper.UserMapper"> <!-- 此处的命名空间必须能点到响应的mapper --> <select id="findAll" resultType="User"> select * from user </select> </mapper>
application.properties
#spring集成Mybatis环境 # 1.设置别名 mybatis.type-aliases-package=cn.x5456.domain # 2.加载Mybatis配置文件 mybatis.mapper-locations = classpath:mapper/*Mapper.xml mybatis.config-location = classpath:mapper/config/sqlMapConfig.xml # 3.配置数据库连接 spring.datasource.driver-class-name= com.mysql.jdbc.Driver spring.datasource.url = jdbc:mysql://localhost:3306/mybatis01?useUnicode=true&characterEncoding=utf-8 spring.datasource.username = root spring.datasource.password = 5456
3） 代码实现
UserMapper.java（接口，与上面usermapper.xml配置文件对应）
import java.util.List;
import org.apache.ibatis.annotations.Mapper;
import cn.x5456.domain.User;
@Mapper
public interface UserMapper {
public List<User> findAll();
}
UserServiceImpl.java
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
/*@Autowired
private JedisCluster jedisCluster;*/
public List<User> findAllUser() {
List<User> list = userMapper.findAll();
return list;
}
}
UserController.java
@RestController
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("allUser")
public List<User> allUser(){
List<User> allUser = userService.findAllUser();
return allUser;
}
}
三、SpringBoot整合redis单机版
1）在application.properties中添加如下代码
#Spring与redis整合 spring.redis.host=127.0.0.1 spring.redis.port=6379
2）在主程序上添加一个注解
/**
* 扫描所有的类
* 并将当前类对象交给Spring管理
*/
@EnableCaching // 开启缓存
@SpringBootApplication
public class mySpringBootDemo {
public static void main(String[] args) {
// 项目入口
SpringApplication.run(mySpringBootDemo.class,args);
}
}
3）在Service层中需要缓存的方法上添加Cacheable注解
/**
* 测试缓存，必须要有一个value，作为redis中缓存的键
* @return
*/
@Cacheable(value = "findAll")
public List<User> findAllUser() {
List<User> list = userMapper.findAll();
return list;
}
四、SpringBoot整合redis集群
