1、集成websocket完整代码
导入maven依赖
XML
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
服务端代码
java
(1)注入bean
@Configuration
@EnableWebSocket
public class WebSocketConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
(2)服务端开放的服务及其业务逻辑
@Slf4j
@Component
@ServerEndpoint("/testcase/page/{clientId}")
//@Lazy
public class WsMessageService {
//与某个客户端的连接会话
private Session session;
//存放每个客户端对应的WebSocket对象。
private static Map<String, WsMessageService> webSocketsBeanMap = new ConcurrentHashMap<>();
//每次连接都是一个新的会话对象,线程安全的
String userId;
//注入业务类。要注意setTestcaseService()的名称不能错,set后的字符串要和要注入的变量名一致。
private static TestcaseService testcaseService;
@Autowired
public void setTestcaseService(TestcaseService testcaseService) {
WsMessageService.testcaseService= testcaseService;
}
//private TestcaseService testcaseService = SpringContextUtil.getBean(TestcaseService.class);
@OnOpen
public void onOpen(Session session, @PathParam(value = "clientId") String userId) {
this.session = session;
this.userId = userId;
webSocketsBeanMap.put(userId, this);
log.info("OnOpen连接成功,userId:{},当前在线人数:{}", userId, this.getOnLineCount());
}
@OnMessage
public void onMessage(String message) throws IOException {
Session session = webSocketsBeanMap.get(this.userId).session;
if (session==null || !session.isOpen()) {
return;
}
log.info("收到客户端的消息:" + message);
//start业务
Integer pageNum = null;
Integer pageSize = null;
String pid = null;
String vid = null;
if (session.getRequestParameterMap().get("pageNum")!= null) {
pageNum = Integer.valueOf(session.getRequestParameterMap().get("pageNum").get(0));
}
if (session.getRequestParameterMap().get("pageNum")!= null) {
pageSize = Integer.valueOf(session.getRequestParameterMap().get("pageSize").get(0));
}
if (session.getRequestParameterMap().get("pid")!= null) {
pid = session.getRequestParameterMap().get("pid").get(0);
}
if (session.getRequestParameterMap().get("vid")!= null) {
vid = session.getRequestParameterMap().get("vid").get(0);
}
PageInfo<TestcasePageVO> pageInfo = testcaseService.findTestcaseByMultiCondition(pageNum, pageSize, pid, vid);
//end业务
try {
JSONObject object = new JSONObject();
object.put("data", pageInfo);
object.put("code", 200);
object.put("message", "SUCCESS");
this.session.getBasicRemote().sendText(String.valueOf(object.toString()));
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@OnClose
public void onClose() throws IOException {
log.info("会话关闭,关闭会话的用户Id为:{}", this.userId);
webSocketsBeanMap.remove(this.userId);
log.info("当前在线人数:{}", this.getOnLineCount());
}
@OnError
public void onError(Session session, Throwable error) {
log.error("连接错误:" + error.getMessage());
error.printStackTrace();
}
private int getOnLineCount() {
return webSocketsBeanMap.size();
}
}
测试服务端的可用性。在浏览器的控制台输入以下代码可以测试。
javascript
function initWebSocket(wsUri) {
var websocket = new WebSocket(wsUri);
websocket.onopen = function(evt) {
console.log('连接建立中... '+wsUri);
};
websocket.onclose = function(evt) {
console.log('连接关闭中...', evt);
};
websocket.onmessage = function(evt) {
console.log('收到来自服务端的消息:', evt.data);
};
websocket.onerror = function(evt) {
console.log('发生错误...', evt);
};
return websocket;
}
var websocket = initWebSocket("ws://ip:port/testcase/page/123?pid=5922cc3d03f74012a7112c931c8497d7&vid=fc2d7a6049ff4c7bafc40bf659b4e903");
var msg, i = 0;
var loop = setInterval(function(){
msg = "Hello " +(i++);
if(websocket.readyState == WebSocket.OPEN) {
websocket.send(msg);
console.log('已发送消息:' +msg);
} else{
clearInterval(loop);
console.log('连接已关闭');
}
}, 10000);
2、集成websocket另一种方法(用控制台测试时返回的数据会乱码)
代码找不到了。但那种方法有一个特征就是使用的注解比当前的方法少。
3、解决业务类注入不进去的问题(两种方法,推荐第一种)
(1)第一种:就是当前使用的注入方法。注意命名,否则不会注入成功
java
//注入业务类。要注意setTestcaseService()的名称不能错,set后的字符串要和要注入的变量名一致。
private static TestcaseService testcaseService;
@Autowired
public void setTestcaseService(TestcaseService testcaseService) {
WsMessageService.testcaseService= testcaseService;
}
(2)第二种:自己写一个SpringContextUtil工具类,协助注入
java
package cn.xxxxx.tmMaster.utils;
import lombok.extern.slf4j.Slf4j;
import org.mybatis.logging.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
import java.util.logging.Logger;
@Slf4j
@Component
public class SpringContextUtil implements ApplicationContextAware {
private static ApplicationContext applicationContext;
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
SpringContextUtil.applicationContext = applicationContext;
}
/**
* 获取 applicationContext
*/
public static ApplicationContext getApplicationContext() {
return applicationContext;
}
/**
* 通过 name 获取 bean 对象
*/
public static Object getBean(String name) {
return getApplicationContext().getBean(name);
}
/**
* 通过 class 获取 bean 对象
*/
public static <T> T getBean(Class<T> clazz) {
return getApplicationContext().getBean(clazz);
}
/**
* 通过 name,clazz 获取指定的 bean 对象
*/
public static <T> T getBean(String name, Class<T> clazz) {
return getApplicationContext().getBean(name, clazz);
}
}
在WsMessageService中使用如下代码注入进去,但在类上必须要@Lazy进行懒加载,否则会报错
java
@Lazy
public class WsMessageService {
......
private TestcaseService testcaseService = SpringContextUtil.getBean(TestcaseService.class);
......
}
不加@Lazy报错如下:org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'wsMessageService' defined in file [D:\javaworkspace\test-xxxx\tm-master\target\classes\cn\xxxxx\tmMaster\service\testcase\WsMessageService.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [cn.xxxxx.tmMaster.service.testcase.WsMessageService]: Constructor threw exception; nested exception is java.lang.NullPointerException
java
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'wsMessageService' defined in file [D:\javaworkspace\test-xxxx\tm-master\target\classes\cn\xxxxx\tmMaster\service\testcase\WsMessageService.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [cn.xxxxx.tmMaster.service.testcase.WsMessageService]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1334) ~[spring-beans-5.3.29.jar:5.3.29]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1232) ~[spring-beans-5.3.29.jar:5.3.29]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.29.jar:5.3.29]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.29.jar:5.3.29]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.29.jar:5.3.29]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.29.jar:5.3.29]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.29.jar:5.3.29]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.29.jar:5.3.29]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:955) ~[spring-beans-5.3.29.jar:5.3.29]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:921) ~[spring-context-5.3.29.jar:5.3.29]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.29.jar:5.3.29]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147) ~[spring-boot-2.7.14.jar:2.7.14]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:731) [spring-boot-2.7.14.jar:2.7.14]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) [spring-boot-2.7.14.jar:2.7.14]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-2.7.14.jar:2.7.14]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1303) [spring-boot-2.7.14.jar:2.7.14]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1292) [spring-boot-2.7.14.jar:2.7.14]
at cn.xxxxx.tmMaster.MasterApplication.main(MasterApplication.java:17) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_382]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_382]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_382]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_382]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50) [spring-boot-devtools-2.7.14.jar:2.7.14]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [cn.xxxxx.tmMaster.service.testcase.WsMessageService]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:224) ~[spring-beans-5.3.29.jar:5.3.29]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:87) ~[spring-beans-5.3.29.jar:5.3.29]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1326) ~[spring-beans-5.3.29.jar:5.3.29]
... 22 common frames omitted
Caused by: java.lang.NullPointerException: null
at cn.xxxxx.tmMaster.utils.SpringContextUtil.getBean(SpringContextUtil.java:55) ~[classes/:na]
at cn.xxxxx.tmMaster.service.testcase.WsMessageService.<init>(WsMessageService.java:48) ~[classes/:na]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_382]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_382]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_382]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_382]
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:211) ~[spring-beans-5.3.29.jar:5.3.29]
... 24 common frames omitted
参考资料:
SpringBoot集成WebSocket实现客户端与服务端长连接通信_springboot实现websocket客户端_拄杖忙学轻声码的博客-CSDN博客 SpringBoot集成WebSocket实现客户端与服务端长连接通信
快速搭建springboot websocket客户端_springboot实现websocket客户端_wcybaonier的博客-CSDN博客 快速搭建springboot websocket客户端