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
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