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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);
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原文地址：http://www.cnblogs.com/1130136248wlxk/p/5098160.html
