JSON工具类

来源：互联网发布：物竞化学品数据库编辑：程序博客网时间：2024/05/22 08:23
json的解析包主要有两个fastJson和Gson。
package com.codefrom.utils;import java.util.ArrayList;import java.util.List;import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.serializer.SerializerFeature;import com.google.gson.Gson;import com.google.gson.GsonBuilder;import com.google.gson.JsonObject;import com.google.gson.reflect.TypeToken;public class JsonUtils {public JsonUtils() {}/** * Gson - 根据json字符串和class返回List<T> *  * @param json * @param clazz * @return */public static <T> List<T> toListByGson(String json, Class<T> classOfT) {// Gson g = new Gson();Gson g = new GsonBuilder().setPrettyPrinting().disableHtmlEscaping().create();List<JsonObject> jsonObjs = g.fromJson(json,new TypeToken<List<JsonObject>>() {}.getType());ArrayList<T> listOfT = new ArrayList<T>();for (JsonObject jsonObj : jsonObjs) {listOfT.add((T) new Gson().fromJson(jsonObj, classOfT));}return listOfT;}/** * Gson - 根据json字符串和class返回Object *  * @param json * @param classOfT * @return */public static <T> Object toObjectByGson(String json, Class<T> classOfT) {Gson g = new Gson();return g.fromJson(json, classOfT);}/** * FastJson - 根据json字符串和class返回List<T> *  * @param json * @param classOfT * @return */public static <T> List<T> toListByFastJson(String json, Class<T> classOfT) {return JSON.parseArray(json, classOfT);}/** * FastJson - 根据json字符串和class返回Object *  * @param json * @param classOfT * @return */public static <T> Object toObjectByFastJson(String json, Class<T> classOfT) {return JSON.parseObject(json, classOfT);}/** * Gson - 根据list生成json字符串 *  * @param list * @return */public static <T> String fromListByGson(List<T> list) {// Gson g = new Gson();// Gson g = new// GsonBuilder().setPrettyPrinting().disableHtmlEscaping().create();Gson g = new GsonBuilder().disableHtmlEscaping().create();String json = g.toJson(list);return json;}public static <T> String fromObjectByGson(Object o) {// Gson g = new Gson();// 使用GsonBuilder创建Gson对象，disableHtmlEscaping可以避免将'转换成\u0027这样的问题Gson g = new GsonBuilder().disableHtmlEscaping().create();String json = g.toJson(o);return json;}public static <T> String fromListByFastJson(List<T> list) {// 使用 SerializerFeature.DisableCircularReferenceDetect// 禁止循环使用，如果不添加，会出现"$ref"这种东西String json = JSON.toJSONString(list,SerializerFeature.DisableCircularReferenceDetect);// String json = JSON.toJSONString(list);return json;}public static <T> String fromObjectByFastJson(Object o) {String json = JSON.toJSONString(o,SerializerFeature.DisableCircularReferenceDetect);return json;}public static void main(String[] args) {// ProjectBean p = new ProjectBean();// p.setTitle("this is title");// p.setTags(new String[]{"tag1","tag2"});// p.setAuthor("I'm the author");//// List<ProjectBean> l = new ArrayList<ProjectBean>();// l.add(p);// l.add(p);//// System.out.println(fromObjectByGson(p));// System.out.println(fromObjectByFastJson(p));// System.out.println(fromListByGson(l));// System.out.println(fromListByFastJson(l));//// ProjectBean p1 = (ProjectBean) toObjectByGson(fromObjectByGson(p),// ProjectBean.class);// ProjectBean p2 = (ProjectBean)// toObjectByFastJson(fromObjectByGson(p), ProjectBean.class);// ProjectBean p3 = (ProjectBean)// toObjectByGson(fromObjectByFastJson(p), ProjectBean.class);// ProjectBean p4 = (ProjectBean)// toObjectByFastJson(fromObjectByFastJson(p), ProjectBean.class);// p1.print();// p2.print();// p3.print();// p4.print();}}
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