Json转换工具类

Json字符串是常用的数据格式，下面提供一个Json和JavaBean转换的工具类，它其实也是基于jackson的：

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;

public class JsonUtils {
  // 定义jackson对象
  private static final ObjectMapper MAPPER = new ObjectMapper();
  
  public static String objectToJson(Object data) {
   try {
  String string = MAPPER.writevalueAsString(data);
  return string;
 } catch (JsonProcessingException e) {
  e.printStackTrace();
 }
   return null;
  }
  
  public static  T jsonToPojo(String jsonData, Class beanType) {
    try {
      T t = MAPPER.readValue(jsonData, beanType);
      return t;
    } catch (Exception e) {
     e.printStackTrace();
    }
    return null;
  }
  
  public static List jsonToList(String jsonData, Class beanType) {
   JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType);
   try {
   List list = MAPPER.readValue(jsonData, javaType);
   return list;
 } catch (Exception e) {
  e.printStackTrace();
 }
   return null;
  }
}

测试：

@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 list = JsonUtils.jsonToList(listc,UserDomain.class);
    System.out.println(list);
    return cr7;
  }

总结

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