SpringBoot+Redis+Nginx實現負載均衡以及Session快取共享
1.環境資訊
nginx-1.11.10
redis-latest包(redis windows版本)
springboot1.5.1.RELEASE
3.nginx和redis解壓縮即可,並正常啟動
4.springboot整合Redis以及springboot,需要在POM檔案中增加依賴
<?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.example</groupId>
<artifactId>demo3</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.1.RELEASE</version >
<relativePath/> <!-- lookup parent from repository -->
</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>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>4.3.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-redis</artifactId>
<version>1.3.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
5.新建Controller類DemoController.java
@Controller
public class DemoController {
@Autowired
DemoService demoService;
@RequestMapping("testcache")
@ResponseBody
public String testCache(@RequestParam String key){
String s = demoService.testCache(key);
return s;
}
@RequestMapping("/getseansession")
@ResponseBody
public Map<String,String> getSession(HttpServletRequest request){
Map<String,String> attributeMap = new HashMap<String, String>();
request.getSession().setAttribute("message", request.getRequestURI());
attributeMap.put("message", request.getRequestURI());
System.out.println("sessionID:" + request.getSession().getId());
return attributeMap;
}
}
6.新建Service類DemoService.java
@Service
public class DemoService {
@Cacheable(value = "keycache")
public String testCache(String key){
System.out.println("testCache:" + key);
return key;
}
}
7.新建RedisConfig類增加@EnableRedisHttpSession註解
@Configuration
@EnableCaching
@EnableRedisHttpSession
public class RedisConfig{
}
8.application.properties檔案配置,其中為了測試ngnix負載均衡功能,本工程配置為8080埠,另一個springboot工程可以配置為別的埠,比如8088,以便啟動兩個Server
#redis spring.redis.password=xxx
#spring.redis.database= # database name
spring.redis.hostname=127.0.0.1 # server host
spring.redis.port=6379
spring.redis.pool.maxActive=8
spring.redis.pool.maxWait=-1
spring.redis.pool.maxIdle=8
spring.redis.pool.minIdle=0
spring.redis.timeout=0
#tomcat port configuration
server.port=8080
可以看到啟動了兩個Server,DemoApplication和DemoApplication(1)
9.ngnix.conf配置檔案中配置負載均衡策略
upstream test {
server localhost:8080;
server localhost:8088;
}
server {
listen 80;
server_name localhost;
client_max_body_size 1024M;
#charset koi8-r;
#access_log logs/host.access.log main;
#location / {
# root html;
# index index.html index.htm;
#}
location / {
proxy_pass http://test/getseansession;
proxy_set_header Host $host:$server_port;
}
10.訪問http://localhost,會發現http請求交替訪問後端兩個server。且sessionID是一樣的“sessionID:ad0cbb3b-d24d-4d61-87ac-b9ddcfeccaa4”。並沒有因為server不一致而sessionID不同
使用RedisClient連線Redis Server,確實儲存了一個sessionID,如下:
11.maven工程目錄
12.實際操縱過程中遇到一個問題:啟動springboot工程的時候報錯“java.lang.IllegalStateException: Cannot load configuration class: org.springframework.boot.autoconfigure.cache.RedisCacheConfiguration”
解決方法:對於spring-context-support依賴,增加了一個version,且版本為4.3.5.RELEASE。啟動,未報錯,問題解決。沒配version的時候,預設是4.3.6.RELEASE,奇怪。後續有時間再研究。
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>4.3.5.RELEASE</version>
</dependency>