Spring Boot 集成 Spring Session，并使用 MongoDB 存储 session 信息

1.原料

apache-maven   3.9.X

Oracle-jdk   1.8.X

Eclipse || IDEA

MongoDB   3.6.X

2.配置

maven -- pom.xml

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.3.RELEASE</version>
	</parent>
	<!-- Add typical dependencies for a web application -->
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.session</groupId>
			<artifactId>spring-session-data-mongodb</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-mongodb</artifactId>
		</dependency>
	</dependencies>

	<!-- Package as an executable jar -->
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

启动器和测试控制器

	  import javax.servlet.http.HttpSession;
	  import org.springframework.boot.SpringApplication;
	  import org.springframework.boot.autoconfigure.SpringBootApplication;
	  import org.springframework.session.data.mongo.config.annotation.web.http.EnableMongoHttpSession;
	  import org.springframework.web.bind.annotation.RequestMapping;
	  import org.springframework.web.bind.annotation.RestController;

	  @SpringBootApplication
	  @EnableMongoHttpSession
	  @RestController
	  public class Application {

		  public static void main(String[] args) throws Exception {
			  SpringApplication.run(Application.class, args);
		  }

		  @RequestMapping("/set")
		  public String setSession(HttpSession session, String sss) {
			  session.setAttribute("hello", sss);
			  return "ok!";
		  }

		  @RequestMapping("/get")
		  public String getSession(HttpSession session) {
			  return session.getAttribute("hello").toString();
		  }

	  }

application.properties

	  ### 节点1

		  spring.session.store-type=MongoDB
		  spring.session.jdbc.table-name=SESSIONS
		  server.servlet.session.timeout=30
		  spring.data.mongodb.host=localhost
		  spring.data.mongodb.port=27017
		  spring.data.mongodb.database=spring-session
		  server.port=8080

	  ### 节点2

		  spring.session.store-type=MongoDB
		  spring.session.jdbc.table-name=SESSIONS
		  server.servlet.session.timeout=30
		  spring.data.mongodb.host=localhost
		  spring.data.mongodb.port=27017
		  spring.data.mongodb.database=spring-session
		  server.port=8081

3.启动和验证

1. 分别启动节点 1 和节点 2

2. 验证

选取任意节点进行设值：

>### ![imagepng](http://blog.lesswork.cn/solo/upload/c5f5eaab2c634cfba4dfb05be202175d_image.png) 

查看：

4.注意事项

@EnableMongoHttpSession    

此注解为开启 MongoDB 存储 session 的专用注解，千万不要搞混

mongo 依赖项

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

此依赖必需，否则项目无法启动

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