WebSocket(二)：传递对象

如果直接使用websocket中的javax.websocket.Session.getBasicRemote().sendObject(map)传递对象，会报如下错误

javax.websocket.EncodeException: No encoder specified for object of class [class org.********]

应该写一个编码器

import java.io.IOException;import java.util.List;import java.util.Map;import javax.websocket.EncodeException;import javax.websocket.Encoder;import javax.websocket.EndpointConfig;import org.codehaus.jackson.map.ObjectMapper;public class EncoderClassVo implements Encoder.Text<Map<String, List>>{    @Override    public void init(EndpointConfig config) {        // TODO Auto-generated method stub    }    @Override    public void destroy() {        // TODO Auto-generated method stub    }//我向web端传递的是Map类型的    @Override    public String encode(Map<String, List> map) throws EncodeException {        ObjectMapper    mapMapper= new ObjectMapper();        try {            String json="";            json=mapMapper.writeValueAsString(map);            return  json;        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();            return "false";        }    }//如果你传递的是一个类，则使用如下写法    @Override      public String encode(Person person) throws EncodeException {          try {              return Java2Json.JavaToJson(person, false);          } catch (MapperException e) {              // TODO Auto-generated catch block              e.printStackTrace();              return null;          }      }  }