Spring Boot + WebSocket + broadcast style, please God, help me see what went wrong

ch7_6\.classpath
ch7_6\.gitignore
ch7_6\.mvn\wrapper\maven-wrapper.jar
ch7_6\.mvn\wrapper\maven-wrapper.properties
ch7_6\.project
ch7_6\.settings\org.eclipse.core.resources.prefs
ch7_6\.settings\org.eclipse.jdt.core.prefs
ch7_6\.settings\org.eclipse.m2e.core.prefs
ch7_6\mvnw
ch7_6\mvnw.cmd
ch7_6\pom.xml
ch7_6\src\main\java\cn\Steven\ch7_6\Ch76Application.java
ch7_6\src\main\java\cn\Steven\ch7_6\domain\WiselyMessage.java
ch7_6\src\main\java\cn\Steven\ch7_6\domain\WiselyResponse.java
ch7_6\src\main\java\cn\Steven\ch7_6\web\WsController.java
ch7_6\src\main\java\cn\Steven\ch7_6\WebMvcConfig.java
ch7_6\src\main\java\cn\Steven\ch7_6\WebSocketConfig.java
ch7_6\src\main\resources\application.properties
ch7_6\src\main\resources\static\jquery-3.2.1.min.js
ch7_6\src\main\resources\static\sockjs.min.js
ch7_6\src\main\resources\static\stomp.min.js
ch7_6\src\main\resources\templates\ws.html
ch7_6\src\test\java\cn\Steven\ch7_6\Ch76ApplicationTests.java
ch7_6\target\classes\application.properties
ch7_6\target\classes\cn\Steven\ch7_6\Ch76Application.class
ch7_6\target\classes\cn\Steven\ch7_6\domain\WiselyMessage.class
ch7_6\target\classes\cn\Steven\ch7_6\domain\WiselyResponse.class
ch7_6\target\classes\cn\Steven\ch7_6\web\WsController.class
ch7_6\target\classes\cn\Steven\ch7_6\WebMvcConfig.class
ch7_6\target\classes\cn\Steven\ch7_6\WebSocketConfig.class
ch7_6\target\classes\META-INF\MANIFEST.MF
ch7_6\target\classes\META-INF\maven\cn.Steven\ch7_6\pom.properties
ch7_6\target\classes\META-INF\maven\cn.Steven\ch7_6\pom.xml
ch7_6\target\classes\static\jquery-3.2.1.min.js
ch7_6\target\classes\static\sockjs.min.js
ch7_6\target\classes\static\stomp.min.js
ch7_6\target\classes\templates\ws.html
ch7_6\target\test-classes\cn\Steven\ch7_6\Ch76ApplicationTests.class
ch7_6\src\main\java\cn\Steven\ch7_6\domain
ch7_6\src\main\java\cn\Steven\ch7_6\web
ch7_6\src\main\java\cn\Steven\ch7_6
ch7_6\src\test\java\cn\Steven\ch7_6
ch7_6\target\classes\cn\Steven\ch7_6\domain
ch7_6\target\classes\cn\Steven\ch7_6\web
ch7_6\target\classes\META-INF\maven\cn.Steven\ch7_6
ch7_6\src\main\java\cn\Steven
ch7_6\src\test\java\cn\Steven
ch7_6\target\classes\cn\Steven\ch7_6
ch7_6\target\classes\META-INF\maven\cn.Steven
ch7_6\target\test-classes\cn\Steven\ch7_6
ch7_6\src\main\java\cn
ch7_6\src\main\resources\static
ch7_6\src\main\resources\templates
ch7_6\src\test\java\cn
ch7_6\target\classes\cn\Steven
ch7_6\target\classes\META-INF\maven
ch7_6\target\test-classes\cn\Steven
ch7_6\src\main\java
ch7_6\src\main\resources
ch7_6\src\test\java
ch7_6\target\classes\cn
ch7_6\target\classes\META-INF
ch7_6\target\classes\static
ch7_6\target\classes\templates
ch7_6\target\test-classes\cn
ch7_6\.mvn\wrapper
ch7_6\src\main
ch7_6\src\test
ch7_6\target\classes
ch7_6\target\test-classes
ch7_6\.mvn
ch7_6\.settings
ch7_6\src
ch7_6\target
ch7_6

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