Response.java

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.core.JsonParser.Feature;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class ResponseEntity<T> {

  private static final ObjectMapper mapper = new ObjectMapper();

  private int code;
  @JsonProperty("msg")
  private String message;
  private T data;

  public int getCode() {
    return code;
  }

  public void setCode(final int code) {
    this.code = code;
  }

  public String getMessage() {
    return message;
  }

  public void setMessage(final String message) {
    this.message = message;
  }

  public T getData() {
    return data;
  }

  public void setData(final T data) {
    this.data = data;
  }

  public static <T> ResponseEntity<T> fromContent(final String content, Class<T> valueType) {
    try {
      return mapper.readValue(content,
          mapper.getTypeFactory().constructParametricType(ResponseEntity.class, valueType));
    } catch (JsonProcessingException e) {
      throw new RuntimeException(e);
    }
  }
}