Java 嵌入Tomcat的WebSocket是404

我上了两门课：

带有嵌入式Tomcat的主类（8.5.20）

Websocket的服务端点

我在IntelliJ IDEA上主修课程 并运行以下JavaScript:

newWebSocket（'ws://localhost:8080/ws'）

在谷歌浏览器的控制台上

我期望响应代码是200，但实际上是404

我怎样才能解决这个问题

主要类别：

package webapp;


import org.apache.catalina.LifecycleException;
import org.apache.catalina.startup.Tomcat;

import javax.servlet.ServletException;
import java.io.File;

public class Main {
    private static final String STATIC_DIR = "src/main/static/";

    public static void main(String[] args) throws ServletException, LifecycleException {
        Tomcat tomcat = new Tomcat();
        tomcat.setPort(8080);

        File staticDir = new File(STATIC_DIR);
        tomcat.addWebapp("/", staticDir.getAbsolutePath());

        tomcat.start();
        tomcat.getServer().await();
    }
}

服务器端点：

package webapp.websocket;

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

@ServerEndpoint("/ws")
public class SampleWebSocket {

    @OnOpen
    public void onOpen(Session session) {
        System.out.println("open");
    }


    @OnClose
    public void onClose(Session session) {
        System.out.println("close");
    }

    @OnMessage
    public String onMessage(String text) {
        System.out.println("message:" + text);
        return "Server:" + text;
    }
}

谢谢。

我找到了解决办法。 这个问题是重复的

我阅读并编辑了pom.xml

下面是我的pom.xml的全部内容

<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>websocket-sample</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <name>websocket-sample</name>

    <properties>
        <java.version>1.8</java.version>
        <maven.compiler.target>${java.version}</maven.compiler.target>
        <maven.compiler.source>${java.version}</maven.compiler.source>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-core</artifactId>
            <version>8.5.20</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-websocket</artifactId>
            <version>8.5.20</version>
        </dependency>
        <dependency>
            <groupId>javax.websocket</groupId>
            <artifactId>javax.websocket-api</artifactId>
            <version>1.1</version>
        </dependency>
    </dependencies>
</project>

4.0.0
com.example
网袋样品
1.0.0-SNAPSHOT
网袋样品
1.8
${java.version}
${java.version}
UTF-8
org.apache.tomcat.embed
tomcat嵌入式内核
8.5.20
org.apache.tomcat
TomcatWebSocket
8.5.20
javax.websocket
javax.websocket-api
1.1

只需将以下依赖项添加到

pom.xml

<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-websocket</artifactId>
    <version>8.5.20</version>
</dependency>

org.apache.tomcat
TomcatWebSocket
8.5.20