JAVA对象JSON数据互相转换的四种常见情况

2019-11-26 15:32:16

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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

复制代码代码如下:

  JSONObject object = JSONObject.fromObject(invite);
   String str=object.toString());

3.把JSON字符串转换为JAVA 对象数组

复制代码代码如下:

  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

复制代码代码如下:

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);

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/"}]}";