[add] 利用Cacheable注解实现简单缓存

Author: LinkinStars

README.md

@@ -99,6 +99,18 @@ SET FOREIGN_KEY_CHECKS = 1;
 <br/>
 
 
+## CacheConfig简单缓存
+1、启动类上需要加@EnableCaching注解  
+2、在需要执行缓存的类上面写上缓存前缀名称  
+@CacheConfig(cacheNames="user")  
+3、在查询方法上使用@Cacheable(key = "'list'")配置键的名称  
+4、在修改方法上使用@CachePut(key = "'list'")配置键的名称  
+http://127.0.0.1:8080/cache/user/list  
+http://127.0.0.1:8080/cache/user/add  
+http://127.0.0.1:8080/cache/user/delete  
+<br/>
+<br/>
+
 ## FileHandleUtil
 > 文件上传工具类，上传到与jar包同级的static目录下，开发环境和服务器环境均可
 ----------

src/main/java/com/linkinstars/springBootTemplate/SpringBootTemplateApplication.java

@@ -3,12 +3,14 @@
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
+import org.springframework.cache.annotation.EnableCaching;
 
 /**
  * SpringBoot启动类
  * @author LinkinStar
  */
 @SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
+@EnableCaching
 public class SpringBootTemplateApplication {
 
 	public static void main(String[] args) {

src/main/java/com/linkinstars/springBootTemplate/bean/UserVO.java

@@ -0,0 +1,44 @@
+package com.linkinstars.springBootTemplate.bean;
+
+import java.io.Serializable;
+
+/**
+ * 用户数据
+ * @author LinkinStar
+ */
+public class UserVO implements Serializable {
+
+    private static final long serialVersionUID = 3732941597434585757L;
+    
+    private int id;
+    private String val;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getVal() {
+        return val;
+    }
+
+    public void setVal(String val) {
+        this.val = val;
+    }
+
+    public UserVO(int id, String val) {
+        this.id = id;
+        this.val = val;
+    }
+
+    @Override
+    public String toString() {
+        return "UserEntity{" +
+                "id=" + id +
+                ", val='" + val + '\'' +
+                '}';
+    }
+}

src/main/java/com/linkinstars/springBootTemplate/controller/UserCacheController.java

@@ -0,0 +1,32 @@
+package com.linkinstars.springBootTemplate.controller;
+
+import com.linkinstars.springBootTemplate.service.IUserCacheService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * @author LinkinStar
+ */
+@RestController
+@RequestMapping("/cache/user")
+public class UserCacheController {
+    
+    @Autowired
+    private IUserCacheService userCacheService;
+    
+    @RequestMapping("list")
+    public String listUser() {
+        return userCacheService.listUser().toString();
+    }
+    
+    @RequestMapping("add")
+    public String addUser() {
+        return String.valueOf(userCacheService.addUser());
+    }
+
+    @RequestMapping("delete")
+    public String deleteUser() {
+        return String.valueOf(userCacheService.deleteUser());
+    }
+}

src/main/java/com/linkinstars/springBootTemplate/controller/UserController.java

@@ -59,7 +59,7 @@ public String test(HttpServletRequest request, @RequestParam(required = false) I
         //进行分页查询
         PageHelper.startPage(pageNum, pageSize);
         List<UserEntity> userList = userService.listUser();
-        PageInfo pageInfo = new PageInfo(userList);
+        PageInfo pageInfo = new PageInfo<>(userList);
 
         //设置返回参数
         request.setAttribute("userList", userList);

src/main/java/com/linkinstars/springBootTemplate/service/IUserCacheService.java

@@ -0,0 +1,27 @@
+package com.linkinstars.springBootTemplate.service;
+
+import com.linkinstars.springBootTemplate.bean.UserVO;
+
+import java.util.List;
+
+/**
+ * 缓存用户信息
+ * @author LinkinStar
+ */
+public interface IUserCacheService {
+
+    /**
+     * 查询缓存用户数据
+     */
+    List<UserVO> listUser();
+
+    /**
+     * 添加一个缓存用户
+     */
+    List<UserVO> addUser();
+
+    /**
+     * 删除一个缓存用户
+     */
+    boolean deleteUser();
+}

src/main/java/com/linkinstars/springBootTemplate/service/Impl/UserCacheServiceImpl.java

@@ -0,0 +1,57 @@
+package com.linkinstars.springBootTemplate.service.Impl;
+
+import com.linkinstars.springBootTemplate.bean.UserVO;
+import com.linkinstars.springBootTemplate.service.IUserCacheService;
+import com.linkinstars.springBootTemplate.util.CacheUserDb;
+import org.springframework.cache.annotation.CacheConfig;
+import org.springframework.cache.annotation.CachePut;
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+/**
+ * 用户信息缓存服务
+ * @author LinkinStar
+ */
+@Service
+@CacheConfig(cacheNames="user")
+public class UserCacheServiceImpl implements IUserCacheService {
+    
+    /**
+     * 查询缓存用户数据
+     * 第一次查询并在控制台输出信息
+     * 之后都从缓存中取
+     */
+    @Override
+    @Cacheable(key = "'list'")
+    public List<UserVO> listUser() {
+        System.out.println("调用了方法，没有从redis取");
+        //模拟数据库查询
+        return CacheUserDb.userVOList;
+    }
+
+    /**
+     * 添加一个缓存用户
+     * 并且操作缓存
+     */
+    @Override
+    @CachePut(key = "'list'")
+    public List<UserVO> addUser() {
+        //模拟数据库添加
+        int id = CacheUserDb.userVOList.size() + 1;
+        CacheUserDb.userVOList.add(new UserVO(id, "val - " + id));
+        return CacheUserDb.userVOList;
+    }
+
+    /**
+     * 删除一个缓存用户
+     * 并不操作缓存
+     */
+    @Override
+    public boolean deleteUser() {
+        //模拟数据库删除
+        CacheUserDb.userVOList.remove(0);
+        return true;
+    }
+}

src/main/java/com/linkinstars/springBootTemplate/util/CacheUserDb.java

@@ -0,0 +1,15 @@
+package com.linkinstars.springBootTemplate.util;
+
+import com.linkinstars.springBootTemplate.bean.UserVO;
+
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * 模拟数据库
+ * @author LinkinStar
+ */
+public class CacheUserDb {
+    
+    public static List<UserVO> userVOList = new LinkedList<>();
+}