JSON

//json-lib-2.2-jdk15.jar

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

一、JS操作

//JSON对象
var a={"name":"tom","sex":"男","age":"24"};

//JSON字符串
var b='{"name":"Mike","sex":"女","age":"29"}';

1.1.对象 转 字符串

var a={"name":"tom","sex":"男","age":"24"};
var objectToStr=JSON.stringify(a);

IE8 内置JSON.stringify，中文变unicode的问题

eval("var str = '"+JSON.stringify(objectToStr)+"';");
alert(str);

1.2.字符串 转 对象

var b='{"name":"Mike","sex":"女","age":"29"}';
var strToObj=JSON.parse(b);
或
var strToObj= eval('(' +b+ ')');

1.3.定义数组，添加对象

var json = {merchants:[]};

if (document.all.chk.length && document.all.chk.length != undefined) {
            for (i = 0; i < document.all.chk.length; i++) {
                if (document.all.chk[i].checked == true) {
                    //checkbox的value 
                    //<INPUT type="checkbox" name="chk"    value="{'id':'<s:property value="MERCH_ID"/>','name':'<s:property value="MERCH_NAME"/>'}" />
                    var tempStr = document.all.chk[i].value;
                    tempStr = tempStr.replace(reg,"\""); 
                    var tempJson = JSON.parse(tempStr);
                    json.merchants.push(tempJson);
                }
            }
        } else {
            if(document.all.chk.checked == true) {
                var tempStr = document.getElementsByName('chk')[0].value;
                tempStr = tempStr.replace(reg,"\""); 
                var tempJson = JSON.parse(tempStr);
                json.merchants.push(tempJson);
            }
        }

1.4.遍历对象数组

for(var i=0;i<json.merchants.length;i++){
　　alert(json.merchants[i].id + "=" + json.merchants[i].name);
}

 

二、JAVA操作

//json-lib-2.2-jdk15.jar

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

2.1.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();

2.2.java对象转换成json对象，并转化为字符串

JSONObject object = JSONObject.fromObject(user);
syso(object.toString());

2.3.json字符串转换为java对象数组

String usersStr = getRequest().getParameter("users");
JSONArray json = JSONArray.fromObject(usersStr);
List<User> userList= (List<User>)JSONArray.toCollection(json, User.class);

2.4.json字符串转换为java对象

/**
jionFormatStr= '{"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"}]}';
**/
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);
}