[Java知识库]Spring Boot 整合 Redis、Junit、Mybatis 综合案例详解

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>org.example</groupId>
    <artifactId>myspringboot-demo03</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!--添加parent-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
    </parent>

    <!--添加起步依赖-->
    <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>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost/springboot?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
    username: root
    password: root
  redis:
    host: localhost
    port: 6379
#配置mapper的映射文件的位置
mybatis:
  mapper-locations: classpath:mappers/*Mapper.xml

#配置别名
type-aliases-package: com.lichun.pojo

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="com.lichun.mapper.UserMapper">
    <select id="findAllUser" resultType="com.lichun.pojo.User">
        select * from user
    </select>
    <select id="findById" resultType="com.lichun.pojo.User">
        select * from user where id=#{id}
    </select>
</mapper>

User.java

package com.lichun.pojo;

import java.io.Serializable;

public class User implements Serializable {
    private Integer id;
    private String username;
    private String password;
    private String name;

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", name='" + name + '\'' +
                '}';
    }

    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;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

UserController.java

package com.lichun.controller;

import com.lichun.pojo.User;
import com.lichun.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("/findAllUser")
    public List<User> findAllUser() {
        return userService.findAllUser();
    }

    @RequestMapping("/{id}")
    public User findById(@PathVariable(name = "id") Integer id) {
        return userService.findById(id);
    }

}

UserService.java

package com.lichun.service;

import com.lichun.pojo.User;

import java.util.List;

public interface UserService {
    public String getUser();
    public List<User> findAllUser();
    public User findById(Integer id);
}

UserServiceImpl.java

package com.lichun.service.impl;

import com.lichun.mapper.UserMapper;
import com.lichun.pojo.User;
import com.lichun.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private RedisTemplate redisTemplate;

    @Override
    public List<User> findAllUser() {
        List<User> list;
        list = (List<User>) redisTemplate.boundValueOps("key_all").get();
        if (list == null || list.size() <= 0) {
            list = userMapper.findAllUser();
            redisTemplate.boundValueOps("key_all").set(list);
        }
        return list;
    }

    @Override
    public User findById(Integer id) {
        return userMapper.findById(id);
    }

    public String getUser() {
        System.out.println("返回用户信息");
        return "xinglibao";
    }

    /*@Override
    public List<User> findAllUser() {
        return userMapper.findAllUser();
    }*/
}

UserMapper.java

package com.lichun.mapper;

import com.lichun.pojo.User;

import java.util.List;

public interface UserMapper {
    public List<User> findAllUser();

    public User findById(Integer id);
}

SpringBootApplicationTest.java

package com.lichun;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
// MapperScan 用于扫描指定包下的所有的接口，将接口产生代理对象交给spring容器
@MapperScan(basePackages = "com.lichun.mapper")
public class SpringBootApplicationTest {
    public static void main(String[] args) {
        SpringApplication.run(SpringBootApplicationTest.class, args);
    }
}

test.java

package com.lichun.test;

import com.lichun.service.UserService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

// 使用SpringRunner运行器
@RunWith(SpringRunner.class)
// 启用SpringBoot测试
@SpringBootTest
public class test {

    @Autowired
    private UserService userService;

    @Test
    public void test01() {
        String user = userService.getUser();
        System.out.println(user);
    }
}