package project;import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONArray;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;// fastjson 的工具包public class JsonUtils { ???/** ????* json字符串转map集合 ????* ????* @param jsonStr ????* @return ????*/ ???public static HashMap<String, String> json2Map(String jsonStr) { ???????return JSON.parseObject(jsonStr, new HashMap<String, String>().getClass()); ???} ???/** ????* map转json字符串 ????* ????* @param map ????* @return ????*/ ???public static String map2Json(Map<String, String> map) { ???????String jsonStr = JSON.toJSONString(map); ???????return jsonStr; ???} ???/** ????* json字符串转换成对象 ????* ????* @param jsonString ????* @param cls ????* @return ????*/ ???public static <T> T json2Bean(String jsonString, Class<T> cls) { ???????T t = null; ???????try { ???????????t = JSON.parseObject(jsonString, cls); ???????} catch (Exception e) { ???????????e.printStackTrace(); ???????} ???????return t; ???} ???/** ????* 对象转换成json字符串 ????* ????* @param obj ????* @return ????*/ ???public static String bean2Json(Object obj) { ???????return JSON.toJSONString(obj); ???} ???/** ????* json字符串转换成List集合 ????* (需要实体类) ????* ????* @param jsonString ????* @return ????*/ ???public static <T> List<T> json2List(String jsonString, Class cls) { ???????List<T> list = null; ???????try { ???????????list = JSON.parseArray(jsonString, cls); ???????} catch (Exception e) { ???????????e.printStackTrace(); ???????} ???????return list; ???} ???/** ????* json字符串转换成ArrayList集合 ????* (需要实体类) ????* ????* @param jsonString ????* @return ????*/ ???public static <T> ArrayList<T> json2ArrayList(String jsonString, Class cls) { ???????ArrayList<T> list = null; ???????try { ???????????list = (ArrayList<T>) JSON.parseArray(jsonString, cls); ???????} catch (Exception e) { ???????????e.printStackTrace(); ???????} ???????return list; ???} ???/** ????* List集合转换成json字符串 ????* ????* @param obj ????* @return ????*/ ???public static String list2Json(Object obj) { ???????return JSONArray.toJSONString(obj, true); ???} ???/** ????* json转List ????* (不需要实体类) ????* ????* @param jsonStr ????* @return ????*/ ???public static JSONArray json2List(String jsonStr) { ???????return JSON.parseArray(jsonStr); ???}}JsonUtils
原文地址：https://www.cnblogs.com/gentle-awen/p/10034057.html