json转换类 Json转换工具类

package com.csdn.myboot.utils;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.List;
/**
 * @Title: JsonUtils.java
 * @Package com.lee.utils
 * @Description: 自定义响应结构, 转换类
 * Copyright: Copyright (c) 2016
 * Company:Nathan.Lee.Salvatore
 * @author leechenxiang
 * @date 2016年4月29日 下午11:05:03
 * @version V1.0
 **/
public class JsonUtils {
  // 定义jackson对象
  private static final ObjectMapper MAPPER = new ObjectMapper();
  /**
   * 将对象转换成json字符串。
   * <p>Title: pojoToJson</p>
   * <p>Description: </p>
   * @param data
   * @return
   **/
  public static String objectToJson(Object data) {
   try {
  String string = MAPPER.writeValueAsString(data);
  return string;
 } catch (JsonProcessingException e) {
  e.printStackTrace();
 }
   return null;
  }
  /**
   * 将json结果集转化为对象
   * @param jsonData json数据
   * @param clazz 对象中的object类型
   * @return
   **/
  public static <T> T jsonToPojo(String jsonData, Class<T> beanType) {
    try {
      T t = MAPPER.readValue(jsonData, beanType);
      return t;
    } catch (Exception e) {
     e.printStackTrace();
    }
    return null;
  }
  /**
   * 将json数据转换成pojo对象list
   * <p>Title: jsonToList</p>
   * <p>Description: </p>
   * @param jsonData
   * @param beanType
   * @return
   **/
  public static <T>List<T> jsonToList(String jsonData, Class<T> beanType) {
   JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType);
   try {
   List<T> list = MAPPER.readValue(jsonData, javaType);
   return list;
 } catch (Exception e) {
  e.printStackTrace();
 }
   return null;
  }
}

@ResponseBody
  @RequestMapping("/hello")
  public String hello(){
    UserDomain user7 = new UserDomain();
    user7.setUserId(7);
    user7.setUserName("Cristiano Ronaldo");
    user7.setPassword("abc123");
    user7.setPhone("13900000000");
    String cr7 = JsonUtils.objectToJson(user7);
    String c = "{\"userId\":7,\"userName\":\"Cristiano Ronaldo\",\"password\":\"abc123\",\"phone\":\"13900000000\"}";
    UserDomain u = JsonUtils.jsonToPojo(c, UserDomain.class);
    System.out.println(u.toString());
    String listc = "[ "+c+" ]";
    List<UserDomain> list = JsonUtils.jsonToList(listc,UserDomain.class);
    System.out.println(list);
    return cr7;
  }