<dependency>
        <groupId>cn.rongcloud.im</groupId>
        <artifactId>server-sdk-java</artifactId>
        <version>3.3.9</version>
    </dependency>

    compile group: 'cn.rongcloud.im', name: 'server-sdk-java', version: '3.3.9'
   

   1、下载或克隆 `server-sdk-java`
   
   2、进入项目 `server-sdk-java` 目录
   
   3、安装依赖 `mvn install`
   
   4、打包 `mvn clean package`
   

Java版本  7+

  String appKey = "appKey";
  String appSecret = "appSecret";
       
  RongCloud rongCloud = RongCloud.getInstance(appKey, appSecret);
  User user = rongCloud.user;

  /**
  *
  * 注册用户，生成用户在融云的唯一身份标识 Token
  */
  UserModel userModel = new UserModel()
            .setId("hHjap87")
            .setName("RongCloud")
            .setPortrait("http://www.rongcloud.cn/images/logo.png");
  TokenResult result = user.register(userModel);
  System.out.println("getToken:  " + result.toString());

# 打印结果
# getToken:  {"reqBody":"userId=userxxd2&name=username&portraitUri=http%3A%2F%2Fwww.rongcloud.cn%2Fimages%2Flogo.png","code":1002,"errorMessage":"Invalidate App-Key.","requestId":"0c1f127e9bc1401bb05eaad61b4502f7"}