Service

这个层我们要做缓存还有一些其他的处理比如事物，还有一些其他的业务逻辑，验证

项目结构

image.png

缓存

image.png

缓存注解的使用

@Cacheable
Spring 在执行 @Cacheable 标注的方法前先查看缓存中是否有数据，如果有数据，则直接返回缓存数据；若没有数据，执行该方法并将方法返回值放进缓存。
参数： value缓存名、 key缓存键值、 condition满足缓存条件、unless否决缓存条件

@CachePut
和 @Cacheable 类似，但会把方法的返回值放入缓存中, 主要用于数据新增和修改方法

@CacheEvict
方法执行成功后会从缓存中移除相应数据。
参数： value缓存名、 key缓存键值、 condition满足缓存条件、 unless否决缓存条件、 allEntries是否移除所有数据（设置为true时会移除所有缓存）

pom

<?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>com.project</groupId>
    <artifactId>service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>service</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>com.project</groupId>
        <artifactId>parent</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </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>com.project</groupId>
            <artifactId>dao</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>



</project>

Java例子

package com.frog.mvcdemo.controller;

import com.frog.mvcdemo.entity.Frog;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
import org.springframework.cache.annotation.CacheConfig;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.web.bind.annotation.*;

import java.util.*;

@CacheConfig(cacheNames = "frogtest")
@RestController
@RequestMapping(value = "/frogtest")
public class FrogTestController {

    @Cacheable()
    @ApiOperation(value = "获取Frog的列表")
    @RequestMapping(value = "",method = RequestMethod.GET)
    public List<Frog> show(){
        List<Frog> list = new ArrayList<>();
        list.add(new Frog(1,"one",2,new Date(),"controllertest"));
        list.add(new Frog(2,"two",3,new Date(),"controllertest"));
        return list;
    }

    @Cacheable()
    @ApiOperation(value = "获取Frog详细信息",notes = "根据id查询对应Frog信息")
    @ApiImplicitParam(name = "id", value = "ID", required = true, dataType = "int", paramType = "path")
    @RequestMapping(value = "/{id}",method = RequestMethod.GET)
    public Map<String,Object> showById(@PathVariable int id){
        Map<String,Object> map = new HashMap<>();
        if(id == 1){
            map.put("FROG",new Frog(1,"one",3,new Date(),"showById"));
            map.put("RESULT","SUCCESS");
        }else{
            map.put("FROG",null);
            map.put("RESULT","ERROR");
        }
        return map;
    }

    @CacheEvict(allEntries = true)
    @ApiOperation(value = "添加Frog详细信息",notes = "添加一条Frog的详细信息")
    @ApiImplicitParam(name = "frog", value = "Frog实体", required = true, dataType = "Frog")
    @RequestMapping(value = "",method = RequestMethod.POST)
    public Map<String,Object> add(@RequestBody Frog frog){
        Map<String,Object> map = new HashMap<>();
        map.put("FROG",frog);
        map.put("RESULT","SUCCESS");
        return map;
    }

    @CacheEvict(allEntries = true)
    @ApiOperation(value = "删除Frog详细信息",notes = "根据id删除对应Frog的详细信息")
    @ApiImplicitParam(name = "id", value = "ID", required = true, dataType = "int", paramType = "path")
    @RequestMapping(value = "/{id}",method = RequestMethod.DELETE)
    public Map<String,Object> deleteById(@PathVariable int id){
        Map<String,Object> map = new HashMap<>();
        if(id != 0){
            map.put("FROG",new Frog(id,"testfrog",id,new Date(),"deleteById"));
            map.put("RESULT","SUCCESS");
        }else{
            map.put("FROG",null);
            map.put("RESULT","ERROR");
        }
        return map;
    }

    @CacheEvict(allEntries = true)
    @ApiOperation(value = "更新Frog详细信息",notes = "根据id更新Frog的详细信息")
    @ApiImplicitParams({
            @ApiImplicitParam(name = "id", value = "ID", required = true, dataType = "int",paramType = "path"),
            @ApiImplicitParam(name = "frog", value = "Frog实体", required = true, dataType = "Frog")
    })
    @RequestMapping(value = "/{id}",method = RequestMethod.PUT)
    public Map<String,Object> updateById(@PathVariable int id,@RequestBody Frog frog){
        Map<String,Object> map = new HashMap<>();
            map.put("FROG",frog);
            map.put("RESULT","SUCCESS");
            map.put("ID",id);
        return map;
    }
}

缓存一般加在dao层或service层，发生回滚时保持redis中数据不被清空，这里测试在Controller层加缓存。
@CacheConfig(cacheNames = “frogtest”)代表这个Controller下需要缓存的方法对应redis中的缓存名为frogtest~keys。
查询方法都用@Cacheable注解加入缓存
添加更新删除@CacheEvict(allEntries = true)注解表示执行方法时删除redis中缓存名frogtest~keys下所有缓存

事务

image.png image.png