JSONObject 工作中的使用

//创建JSONObject对象
JSONObject jsonObject = new JSONObject();
jsonObject.put("name", "kevin");
jsonObject.put("Max.score", new Integer(100));
jsonObject.put("Min.score", new Integer(50));
jsonObject.put("nickname", "picglet");
System.out.println("jsonObject==>"+jsonObject);
jsonObject==>{"name":"kevin","Max.score":100,"Min.score":50,"nickname":"picglet"}

boolean isArray = jsonObject.isArray();
boolean isEmpty = jsonObject.isEmpty();
boolean isNullObject = jsonObject.isNullObject();
System.out.println("isArray:"+isArray+" isEmpty:"+isEmpty+" isNullObject:"+isNullObject);
//添加属性
jsonObject.element("address", "swap lake");
System.out.println("添加属性后的对象==>"+jsonObject);
//返回一个JSONArray对象
JSONArray jsonArray = new JSONArray();
jsonArray.add(0, "this is a jsonArray value");
jsonArray.add(1,"another jsonArray value");
jsonObject.element("jsonArray", jsonArray);
JSONArray array = jsonObject.getJSONArray("jsonArray");
System.out.println("返回一个JSONArray对象："+array);

1. List集合转换成json代码

List list = new ArrayList();

list.add( "first" );

list.add( "second" );

JSONArray jsonArray2 = JSONArray.fromObject( list );

2. Map集合转换成json代码

Map map = new HashMap();

map.put("name", "json");

map.put("bool", Boolean.TRUE);

map.put("int", new Integer(1));

map.put("arr", new String[] { "a", "b" });

map.put("func", "function(i){ return this.arr[i]; }");

JSONObject json = JSONObject.fromObject(map);
还有一个就是在工作中，前端form 表单元素提交，与后台交互一个经常用到的就是
[code]fromObject(Object object)

var bean = $('#EditFormApp').serializeArray();
var r = $('#EditFormApp').form('validate');
if (r) {
var beanJson = convertToJson(bean);
var beanJsonString = JSON.stringify(beanJson);
$.post(baseurl + 'platform/applicationLiaAction/updatestatus.json',
{
jsonString : beanJsonString
}, function(status) {
if (status.flag == "success") {
$.messager.show({
title : '提示',
msg : "保存成功！"
});
} else {
$.messager.show({
title : '提示',
msg : "保存失败！"
});
}
dataGrid.load();

});

}
后台可能通过个方法

String jsonString = request.getParameter("jsonString");
jsonString 的格式就是 String json = "{id:'1001',name:'张三',age:'22'}";

JSONObject jsonObject = JSONObject.fromObject(jsonString);
JSONUtils.getMorpherRegistry().registerMorpher(
new DateMorpher(new String[] { "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd", "yyyy-MM-dd't'HH:mm:ss" }, new Date()));
ApplicationInfo bean = (ApplicationInfo) JSONObject.toBean(jsonObject, ApplicationInfo.class);

fromObject(Object object, JsonConfig jsonConfig)
FaiDataTree faiDataTree = dataTreeList.get(i);
JSONObject jsonObject =
JSONObject.fromObject(faiDataTree
,jsonConfig)
其中的[code]jsonConfig

，是一些初始化的注册事件，信息详见api
一个在线 的API
http://json-lib.sourceforge.net/apidocs/jdk15/index.html[/code]