java-JSON net.sf.json使用

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json-lib下载地址(全，0分下载)：http://download.csdn.net/detail/liang_k/7943867

1.JAR包简介

要使程序可以运行必须引入JSON-lib包，JSON-lib包同时依赖于以下的JAR包：

commons-lang.jar
commons-beanutils.jar
commons-collections.jar
commons-logging.jar
ezmorph.jar
json-lib-2.2.2-jdk15.jar

2.JSONObject对象使用

JSON-lib包是一个beans,collections,maps,java arrays 和XML和JSON互相转换的包。在本例中，我们将使用JSONObject类创建JSONObject对象，然后我们打印这些对象的值。为了使用 JSONObject对象，我们要引入"net.sf.json"包。为了给对象添加元素，我们要使用put()方法。

2.1.实例1

package jsontest;import net.sf.json.JSONArray;import net.sf.json.JSONObject;public class JSONObjectSample {    // 创建JSONObject对象    private static JSONObject createJSONObject() {        JSONObject jsonObject = new JSONObject();        jsonObject.put("username", "huangwuyi");        jsonObject.put("sex", "男");        jsonObject.put("QQ", "413425430");        jsonObject.put("Min.score", new Integer(99));        jsonObject.put("nickname", "梦中心境");        return jsonObject;    }    public static void main(String[] args) {        JSONObject jsonObject = JSONObjectSample.createJSONObject();//静待方法，直接通过类名+方法调用        // 输出jsonobject对象        System.out.println("jsonObject：" + jsonObject);        // 判读输出对象的类型        boolean isArray = jsonObject.isArray();        boolean isEmpty = jsonObject.isEmpty();        boolean isNullObject = jsonObject.isNullObject();        System.out.println("是否为数组:" + isArray + "， 是否为空:" + isEmpty                + "， isNullObject:" + isNullObject);        // 添加属性，在jsonObject后面追加元素。        jsonObject.element("address", "福建省厦门市");        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);        //在jsonObject后面住家一个jsonArray        JSONArray array = jsonObject.getJSONArray("jsonArray");        System.out.println(jsonObject);                        System.out.println("返回一个JSONArray对象：" + array);        // 添加JSONArray后的值        // {"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市","jsonArray":["this is a jsonArray value","another jsonArray value"]}        System.out.println("结果=" + jsonObject);        // 根据key返回一个字符串        String username = jsonObject.getString("username");        System.out.println("username==>" + username);        // 把字符转换为 JSONObject        String temp = jsonObject.toString();        JSONObject object = JSONObject.fromObject(temp);        // 转换后根据Key返回值        System.out.println("qq=" + object.get("QQ"));    }}

输出结果

jsonObject：{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境"}是否为数组:false，是否为空:false， isNullObject:false添加属性后的对象：{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市"}{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市","jsonArray":["this is a jsonArray value","another jsonArray value"]}返回一个JSONArray对象：["this is a jsonArray value","another jsonArray value"]结果={"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市","jsonArray":["this is a jsonArray value","another jsonArray value"]}username==>huangwuyiqq=413425430

2.2.实例2.

package jsontest;import net.sf.json.JSONArray;import net.sf.json.JSONObject;public class JSONTest {    public static void main(String args[])    {        JSONObject jsonObj0  = new JSONObject();        JSONObject jsonObj  = new JSONObject();        JSONObject jsonObj2  = new JSONObject();        JSONObject jsonObj3  = new JSONObject();        JSONArray jsonArray = new JSONArray();                //创建jsonObj0        jsonObj0.put("name0", "zhangsan");        jsonObj0.put("sex1", "female");        System.out.println("jsonObj0:"+jsonObj0);                //创建jsonObj1        jsonObj.put("name", "xuwei");        jsonObj.put("sex", "male");        System.out.println("jsonObj:"+jsonObj);            //创建jsonObj2，包含两个条目，条目内容分别为jsonObj0，jsonObj1        jsonObj2.put("item0", jsonObj0);        jsonObj2.put("item1", jsonObj);        System.out.println("jsonObj2:"+jsonObj2);                //创建jsonObj3，只有一个条目，内容为jsonObj2        jsonObj3.element("j3", jsonObj2);        System.out.println("jsonObj3:"+jsonObj3);            //往JSONArray中添加JSONObject对象。发现JSONArray跟JSONObject的区别就是JSONArray比JSONObject多中括号[]        jsonArray.add(jsonObj);        System.out.println("jsonArray:"+jsonArray);                JSONObject jsonObj4  = new JSONObject();        jsonObj4.element("weather", jsonArray);        System.out.println("jsonObj4:"+jsonObj4);    }}

输出结果：

jsonObj0:{"name0":"zhangsan","sex1":"female"}jsonObj:{"name":"xuwei","sex":"male"}jsonObj2:{"item0":{"name0":"zhangsan","sex1":"female"},"item1":{"name":"xuwei","sex":"male"}}jsonObj3:{"j3":{"item0":{"name0":"zhangsan","sex1":"female"},"item1":{"name":"xuwei","sex":"male"}}}jsonArray:[{"name":"xuwei","sex":"male"}]jsonObj4:{"weather":[{"name":"xuwei","sex":"male"}]}

关于java bean的处理

创建java对象：

public class Address {private String road;private String streate;private String provience;private String no;public String getRoad() {  return road;}public void setRoad(String road) {  this.road = road;}public String getStreate() {  return streate;}public void setStreate(String streate) {  this.streate = streate;}public String getProvience() {  return provience;}public void setProvience(String provience) {  this.provience = provience;}public String getNo() {  return no;}public void setNo(String no) {  this.no = no;}}

1.将json对象转化为java对象

JSONObject jsonObject = JSONObject.fromObject("{\"no\":\"104\",\"provience\":\"陕西\",\"road\":\"高新路\",\"streate\":\"\"}");  Address Address  = (Address) JSONObject.toBean(jsonObject,Address.class);  log.info(Address.getNo());  log.info(Address.getStreate());  log.info(Address.getProvience());  log.info(Address.getRoad());

2.将java对象转化为json对象

将java对象转化为json对象：

Address address = new Address();    address.setNo("104");    address.setProvience("陕西");    address.setRoad("高新路");    address.setStreate("");    JSONArray json = JSONArray.fromObject(address);    log.info(json.toString());

将java对象list转化为json对象：

  Address address = new Address();  address.setNo("104");  address.setProvience("陕西");  address.setRoad("高新路");  address.setStreate("");  Address address2 = new Address();  address2.setNo("105");  address2.setProvience("陕西");  address2.setRoad("未央路");  address2.setStreate("张办");  List list = new ArrayList();  list.add(address);  list.add(address2);  JSONArray json = JSONArray.fromObject(list);  log.info(json.toString());

3.JSONArray转化为list

JSONObject jsonObject = JSONObject.fromObject("{\"no\":\"104\",\"provience\":\"陕西\",\"road\":\"高新路\",\"streate\":\"\"}");  JSONArray jsonArray = new JSONArray();  jsonArray.add("{\"no\":\"104\",\"provience\":\"陕西\",\"road\":\"高新路\",\"streate\":\"\"}");  jsonArray.add("{\"no\":\"104\",\"provience\":\"陕西\",\"road\":\"高新路\",\"streate\":\"123\"}");  Object object = JSONArray.toList(jsonArray,Address.class);

转载：http://www.cnblogs.com/hitwtx/articles/2468633.html

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