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; }