JAVA对象JSON数据互相转换的四种常见情况

1. 把java 对象列表转换为json对象数组,并转为字符串

代码如下:
    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
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
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
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\"}]}";

相关的jar包:

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