• 玩转spring boot——结合redis


    前言


      Redis 是一个高性能的key-value数据库。 redis的出现,很大程度补偿了memcached这类key/value存储的不足,在部 分场合可以对关系数据库起到很好的补充作用。它提供了Java,C/C++,C#,PHP,JavaScript,Perl,Object-C,Python,Ruby,Erlang等客户端,使用很方便。使用redis有两种场景:1.缓存。2.高热数据存储(无非还是缓存),弥补关系型数据库的不足。

    一、准备工作


    下载redis的windows版zip包:https://github.com/MSOpenTech/redis/releases

    运行redis-server.exe程序

    出现黑色窗口表示redis服务已启动。

    二、与spring boot结合


    参考官方例子:http://spring.io/guides/gs/messaging-redis/

    修改pom.xml:

    <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.github.carter659</groupId>
        <artifactId>spring08</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.4.2.RELEASE</version>
        </parent>
    
    
        <name>spring08</name>
        <url>http://maven.apache.org</url>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-redis</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-thymeleaf</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <optional>true</optional>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    </project>
    pom.xml

    修改入口类文件“App.java”:

    package com.github.carter659.spring08;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.context.annotation.Bean;
    import org.springframework.data.redis.connection.RedisConnectionFactory;
    import org.springframework.data.redis.core.StringRedisTemplate;
    
    /**
     * 博客出处:http://www.cnblogs.com/GoodHelper/
     * @author 刘冬
     *
     */
    @SpringBootApplication
    public class App {
        
        public static void main(String[] args) {
            SpringApplication.run(App.class, args);
        }
        
        @Bean
        StringRedisTemplate template(RedisConnectionFactory connectionFactory) {
            return new StringRedisTemplate(connectionFactory);
        }
    }
    App.java

    添加控制器“MainController.java”文件:

    package com.github.carter659.spring08;
    
    import java.util.HashMap;
    import java.util.Map;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.data.redis.core.StringRedisTemplate;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    /**
     * 博客出处:http://www.cnblogs.com/GoodHelper/
     * 
     * @author 刘冬
     *
     */
    @Controller
    public class MainController {
    
        private static final String STR_REDIS_KEY = "key:name";
    
        @Autowired
        private StringRedisTemplate redisTemplate;
    
        @GetMapping("/")
        public String index() {
            return "index";
        }
    
        @PostMapping("/setString")
        public @ResponseBody Map<String, Object> setString(String value) {
            redisTemplate.opsForValue().set(STR_REDIS_KEY, value);
            Map<String, Object> map = new HashMap<>();
            map.put("msg", "ok");
            return map;
        }
    
        @PostMapping("/getString")
        public @ResponseBody Map<String, Object> getString() {
            String value = redisTemplate.opsForValue().get(STR_REDIS_KEY);
            Map<String, Object> map = new HashMap<>();
            map.put("value", value);
            map.put("msg", "ok");
            return map;
        }
    
    }
    MainController.java

    新建模板src/main/resources/templates/index.html:

    <!DOCTYPE html>
    <html xmlns:th="http://www.thymeleaf.org">
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>玩转spring boot——结合redis</title>
    <script src="//cdn.bootcss.com/angular.js/1.5.6/angular.min.js"></script>
    <script type="text/javascript">
        /*<![CDATA[*/
        var app = angular.module('app', []);
        app.controller('MainController', function($rootScope, $scope, $http) {
    
            $scope.value = '刘冬';
    
            //保存
            $scope.setString = function() {
                $http({
                    url : '/setString?value=' + $scope.value,
                    method : 'POST'
                });
            }
    
            $scope.getString = function() {
                $http({
                    url : '/getString',
                    method : 'POST'
                }).success(function(r) {
                    $scope.result = JSON.stringify(r)
                });
            }
        });
    
        /*]]>*/
    </script>
    </head>
    <body ng-app="app" ng-controller="MainController">
        <h1>玩转spring boot——结合redis</h1>
        <h4>
            <a href="http://www.cnblogs.com/GoodHelper/">from 刘冬的博客</a>
        </h4>
        <input type="text" ng-model="value" />
        <input type="button" value="设置" ng-click="setString()" />
    
        <br />
        <br />
        <input type="button" value="获取" ng-click="getString()" />
        <br />
        <h3>结果:</h3>
        <p>{{result}}</p>
    
    
        <br />
        <a href="http://www.cnblogs.com/GoodHelper/">点击访问原版博客</a>
    </body>
    </html>
    index.html

    运行效果:

    点击获取,提示未空,再设置:

    与redis的简单结合就实现了。

    三、redis缓存集成


    添加“Order.java”类文件:

    package com.github.carter659.spring08;
    
    import java.io.Serializable;
    import java.util.Date;
    
    /**
     * 博客出处:http://www.cnblogs.com/GoodHelper/
     * 
     * @author 刘冬
     *
     */
    public class Order implements Serializable {
    
        /**
         * 
         */
        private static final long serialVersionUID = 1L;
    
        public String id;
    
        public String no;
    
        public Date date;
    
        public int quantity;
    
        /**
         * 省略 get set
         */
    }
    Order

    注意,一定要实现“Serializable”接口。

    新建“OrderDao.java”类文件:

    package com.github.carter659.spring08;
    
    import java.util.Date;
    
    import org.springframework.cache.annotation.Cacheable;
    import org.springframework.stereotype.Component;
    
    /**
     * 博客出处:http://www.cnblogs.com/GoodHelper/
     * 
     * @author 刘冬
     *
     */
    @Component
    public class OrderDao {
    
        /**
         * 假设从数据库获取的订单数据
         * 
         * @param id
         * @return
         */
        @Cacheable(value = "order", key = "'.id.'+#id")
        public Order get(String id) {
            Order order = new Order();
            order.id = id;
            order.no = "No.00001";
            order.date = new Date();
            order.quantity = 100;
            return order;
        }
    }
    OrderDao.java

    在方法“public Order get(String id)”上加“@Cacheable”注解

    此方法模拟数据库的查询,如果是第一次查询,返回当前时间(new Date())。如果在缓存中查询,则时间是之前的。

    控制器“MainController.java”增加“orderDao”字段和“get”方法:

    @Autowired
    private OrderDao orderDao;
    @PostMapping("/get")
    public @ResponseBody Order get(@RequestParam String id) {
        return orderDao.get(id);
    }

    在App类中加入启动缓存的注解“@EnableCaching”:

    package com.github.carter659.spring08;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cache.annotation.EnableCaching;
    import org.springframework.context.annotation.Bean;
    import org.springframework.data.redis.connection.RedisConnectionFactory;
    import org.springframework.data.redis.core.StringRedisTemplate;
    
    /**
     * 博客出处:http://www.cnblogs.com/GoodHelper/
     * 
     * @author 刘冬
     *
     */
    @SpringBootApplication
    @EnableCaching
    public class App {
    
        public static void main(String[] args) {
            SpringApplication.run(App.class, args);
        }
    
        @Bean
        StringRedisTemplate template(RedisConnectionFactory connectionFactory) {
            return new StringRedisTemplate(connectionFactory);
        }
    }

    修改之前的index.html文件

    <!DOCTYPE html>
    <html xmlns:th="http://www.thymeleaf.org">
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>玩转spring boot——结合redis</title>
    <script src="//cdn.bootcss.com/angular.js/1.5.6/angular.min.js"></script>
    <script type="text/javascript">
        /*<![CDATA[*/
        var app = angular.module('app', []);
        app.controller('MainController', function($rootScope, $scope, $http) {
    
            $scope.value = '刘冬';
            $scope.id = '123456';
    
            //保存
            $scope.setString = function() {
                $http({
                    url : '/setString?value=' + $scope.value,
                    method : 'POST'
                });
            }
    
            $scope.getString = function() {
                $http({
                    url : '/getString',
                    method : 'POST'
                }).success(function(r) {
                    $scope.result = JSON.stringify(r)
                });
            }
            $scope.getOrder = function() {
                $http({
                    url : '/get?id=' + $scope.id,
                    method : 'POST'
                }).success(function(r) {
                    $scope.result = JSON.stringify(r)
                });
            }
        });
    
        /*]]>*/
    </script>
    </head>
    <body ng-app="app" ng-controller="MainController">
        <h1>玩转spring boot——结合redis</h1>
        <h4>
            <a href="http://www.cnblogs.com/GoodHelper/">from 刘冬的博客</a>
        </h4>
        <input type="text" ng-model="value" />
        <input type="button" value="设置" ng-click="setString()" />
    
        <br />
        <br />
        <input type="button" value="获取" ng-click="getString()" />
        <br />
        <br />
        <input type="text" ng-model="id" />
        <br />
        <input type="button" value="获取订单" ng-click="getOrder()" />
        <br />
        <br />
        <h3>结果:</h3>
        <p>{{result}}</p>
    
    
        <br />
        <a href="http://www.cnblogs.com/GoodHelper/">点击访问原版博客</a>
    </body>
    </html>
    index.html

    运行效果:

    第一遍查询生成当前时间,之后再查询则时间不变

    代码:https://github.com/carter659/spring-boot-08.git

    如果你觉得我的博客对你有帮助,可以给我点儿打赏,左侧微信,右侧支付宝。

    有可能就是你的一点打赏会让我的博客写的更好:)

    玩转spring boot系列目录

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  • 原文地址:https://www.cnblogs.com/GoodHelper/p/6247065.html
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