springboot webscoket 实现群聊，点对点聊天Demo

springboot webscoket 实现群聊，点对点聊天 Demo, 实现对应博客测试demo, https://blog.csdn.net/qq_38455201/article/details/80374712

/*
Licensed to the Apache Software Foundation （ASF） under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License Version 2.0 （the
“License“）; you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing
software distributed under the License is distributed on an
“AS IS“ BASIS WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
*/

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.util.Properties;

public class MavenWrapperDownloader {

    /**
     * Default URL to download the maven-wrapper.jar from if no ‘downloadUrl‘ is provided.
     */
    private static final String DEFAULT_DOWNLOAD_URL =
            “https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.4.2/maven-wrapper-0.4.2.jar“;

    /**
     * Path to the maven-wrapper.properties file which might contain a downloadUrl property to
     * use instead of the default one.
     */
    private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
            “.mvn/wrapper/maven-wrapper.properties“;

    /**
     * Path where the maven-wrapper.jar will be saved to.
     */
    private static final String MAVEN_WRAPPER_JAR_PATH =
            “.mvn/wrapper/maven-wrapper.jar“;

    /**
     * Name of the property which should be used to override the default download url for the wrapper.
     */
    private static final String PROPERTY_NAME_WRAPPER_URL = “wrapperUrl“;

    public static void main（String args[]） {
        System.out.println（“- Downloader started“）;
        File baseDirectory = new File（args[0]）;
        System.out.println（“- Using base directory: “ + baseDirectory.getAbsolutePath（））;

        // If the maven-wrapper.properties exists read it and check if it contains a custom
        // wrapperUrl parameter.
        File mavenWrapperPropertyFile = new File（baseDirectory MAVEN_WRAPPER_PROPERTIES_PATH）;
        String url = DEFAULT_DOWNLOAD_URL;
        if（mavenWrapperPropertyFile.exists（）） {
            FileInputStream mavenWrapperPropertyFileInputStream = null;
            try {
                mavenWrapperPropertyFileInputStream = new FileInputStream（mavenWrapperPropertyFile）;
                Properties mavenWrapperProperties = new Properties（）;
                mavenWrapperProperties.load（mavenWrapperPropertyFileInputStream）;
                url = mavenWrapperProperties.getProperty（PROPERTY_NAME_WRAPPER_URL url）;
            } catch （IOException e） {
                System

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件        277  2019-03-03 22:57  webscoketdemo\.gitignore

     文件        638  2019-03-03 23:03  webscoketdemo\.idea\compiler.xml

     文件        272  2019-03-03 23:39  webscoketdemo\.idea\encodings.xml

     文件        568  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__ch_qos_logback_logback_classic_1_2_3.xml

     文件        547  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__ch_qos_logback_logback_core_1_2_3.xml

     文件        503  2019-03-03 23:09  webscoketdemo\.idea\libraries\Maven__commons_io_commons_io_2_3.xml

     文件        514  2019-03-03 23:09  webscoketdemo\.idea\libraries\Maven__com_alibaba_fastjson_1_2_12.xml

     文件        522  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__com_fasterxml_classmate_1_4_0.xml

     文件        644  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__com_fasterxml_jackson_core_jackson_annotations_2_9_0.xml

     文件        595  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__com_fasterxml_jackson_core_jackson_core_2_9_8.xml

     文件        623  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__com_fasterxml_jackson_core_jackson_databind_2_9_8.xml

     文件        674  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__com_fasterxml_jackson_datatype_jackson_datatype_jdk8_2_9_8.xml

     文件        688  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__com_fasterxml_jackson_datatype_jackson_datatype_jsr310_2_9_8.xml

     文件        729  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__com_fasterxml_jackson_module_jackson_module_parameter_names_2_9_8.xml

     文件        546  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__com_jayway_jsonpath_json_path_2_4_0.xml

     文件        700  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__com_vaadin_external_google_android_json_0_0_20131108_vaadin1.xml

     文件        611  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__javax_annotation_javax_annotation_api_1_3_2.xml

     文件        611  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__javax_validation_validation_api_2_0_1_Final.xml

     文件        455  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__junit_junit_4_12.xml

     文件        536  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__net_bytebuddy_byte_buddy_1_9_10.xml

     文件        578  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__net_bytebuddy_byte_buddy_agent_1_9_10.xml

     文件        542  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__net_minidev_accessors_smart_1_2.xml

     文件        507  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__net_minidev_json_smart_2_3.xml

     文件        573  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__org_apache_logging_log4j_log4j_api_2_11_2.xml

     文件        608  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__org_apache_logging_log4j_log4j_to_slf4j_2_11_2.xml

     文件        625  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__org_apache_tomcat_embed_tomcat_embed_core_9_0_16.xml

     文件        611  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__org_apache_tomcat_embed_tomcat_embed_el_9_0_16.xml

     文件        660  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__org_apache_tomcat_embed_tomcat_embed_websocket_9_0_16.xml

     文件        542  2019-03-03 23:03  webscoketdemo\.idea\libraries\Maven__org_assertj_assertj_core_3_11_1.xml

     文件        589  2019-03-03 23:22  webscoketdemo\.idea\libraries\Maven__org_attoparser_attoparser_2_0_5_RELEASE.xml

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