JSON 字符串 与 java 对象的…

最新推荐文章于 2021-02-28 07:12:18 发布

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最新推荐文章于 2021-02-28 07:12:18 发布

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本文介绍如何使用json-lib库实现Java对象与JSON字符串之间的相互转换。内容涵盖对象及对象列表到JSON的转换方法，同时也介绍了如何从JSON字符串中解析出Java对象及对象列表。

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原文地址：JSON 字符串与 java 对象的转换 作者：阿诺

jsonLib 经典文章：http://json-lib.sourceforge.net/xref-test/net/sf/json/TestJSONObject.html

// 引入相应的包

//json-lib-2.2-jdk15.jar

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

1. //把java 对象列表转换为json对象数组，并转为字符串

JSONArray array = JSONArray.fromObject(userlist);
String jsonstr = array.toString();

2.//把java对象转换成json对象，并转化为字符串

JSONObject object = JSONObject.fromObject(invite);
Log4jInit.ysulogger.debug(object.toString());

3.//把JSON字符串转换为JAVA 对象数组

String personstr = getRequest().getParameter("persons");
JSONArray json = JSONArray.fromObject(personstr);
List<InvoidPerson> persons = (List<InvoidPerson>)JSONArray.toCollection(json, nvoidPerson.class);
4.//把JSON字符串转换为JAVA 对象

str = "{"lendperson":"李四","lendcompany":"有限公司","checkperson":"李四",
  "lenddate":"2010-07-19T00:00:00","lendcounts":4,"
  passports":[{"passportid":"d","name":"李豫川","passporttype":"K"},
  {"passportid":"K9051","name":"李平","passporttype":"K"},
  {"passportid":"K90517","name":"袁寒梅","passporttype":"K"},
  {"passportid":"K905199","name":"贺明","passporttype":"K"}]}";
   JSONObject jsonobject = JSONObject.fromObject(str);
  PassportLendsEntity passportlends = null;
  try {
   //获取一个json数组
   JSONArray array = jsonobject.getJSONArray("passports");
   //将json数组转换成 List<PassPortForLendsEntity>泛型
   List<PassPortForLendsEntity> list = new ArrayList<PassPortForLendsEntity>();
   for (int i = 0; i < array.size(); i++) {
            JSONObject object = (JSONObject)array.get(i);
            PassPortForLendsEntity passport = (PassPortForLendsEntity)JSONObject.toBean(object,
              PassPortForLendsEntity.class);
            if(passport != null){
             list.add(passport);
            }
         }
   //转换PassportLendsEntity 实体类
   passportlends = (PassportLendsEntity)JSONObject.toBean(jsonobject, PassportLendsEntity.class);