1.JAR包簡介
要使程序可以運(yùn)行必須引入JSON-lib包，JSON-lib包同時依賴于以下的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對象使用
JSON-lib包是一個beans,collections,maps,java arrays 和XML和JSON互相轉(zhuǎn)換的包。在本例中，我們將使用JSONObject類創(chuàng)建JSONObject對象，然后我們打印這些對象的值。為了使用 JSONObject對象，我們要引入"net.sf.json"包。為了給對象添加元素，我們要使用put()方法。
2.1.實(shí)例1
package jsontest;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
public class JSONObjectSample {
// 創(chuàng)建JSONObject對象
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", "夢中心境");
return jsonObject;
}
public static void main(String[] args) {
JSONObject jsonObject = JSONObjectSample.createJSONObject();//靜待方法，直接通過類名+方法調(diào)用
// 輸出jsonobject對象
System.out.println("jsonObject：" + jsonObject);
// 判讀輸出對象的類型
boolean isArray = jsonObject.isArray();
boolean isEmpty = jsonObject.isEmpty();
boolean isNullObject = jsonObject.isNullObject();
System.out.println("是否為數(shù)組:" + isArray + "， 是否為空:" + isEmpty
+ "， isNullObject:" + isNullObject);
// 添加屬性，在jsonObject后面追加元素。
jsonObject.element("address", "福建省廈門市");
System.out.println("添加屬性后的對象：" + jsonObject);
// 返回一個JSONArray對象
JSONArray jsonArray = new JSONArray();
jsonArray.add(0, "this is a jsonArray value");
jsonArray.add(1, "another jsonArray value");
jsonObject.element("jsonArray", jsonArray);
//在jsonObject后面住家一個jsonArray
JSONArray array = jsonObject.getJSONArray("jsonArray");
System.out.println(jsonObject);
System.out.println("返回一個JSONArray對象：" + array);
// 添加JSONArray后的值
// {"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"夢中心境","address":"福建省廈門市","jsonArray":["this is a jsonArray value","another jsonArray value"]}
System.out.println("結(jié)果=" + jsonObject);
// 根據(jù)key返回一個字符串
String username = jsonObject.getString("username");
System.out.println("username==>" + username);
// 把字符轉(zhuǎn)換為 JSONObject
String temp = jsonObject.toString();
JSONObject object = JSONObject.fromObject(temp);
// 轉(zhuǎn)換后根據(jù)Key返回值
System.out.println("qq=" + object.get("QQ"));
}
}
輸出結(jié)果
jsonObject：{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"夢中心境"}
是否為數(shù)組:false， 是否為空:false， isNullObject:false
添加屬性后的對象：{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"夢中心境","address":"福建省廈門市"}
{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"夢中心境","address":"福建省廈門市","jsonArray":["this is a jsonArray value","another jsonArray value"]}
返回一個JSONArray對象：["this is a jsonArray value","another jsonArray value"]
結(jié)果={"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"夢中心境","address":"福建省廈門市","jsonArray":["this is a jsonArray value","another jsonArray value"]}
username==>huangwuyi
qq=413425430
2.2.實(shí)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();
//創(chuàng)建jsonObj0
jsonObj0.put("name0", "zhangsan");
jsonObj0.put("sex1", "female");
System.out.println("jsonObj0:"+jsonObj0);
//創(chuàng)建jsonObj1
jsonObj.put("name", "xuwei");
jsonObj.put("sex", "male");
System.out.println("jsonObj:"+jsonObj);
//創(chuàng)建jsonObj2，包含兩個條目，條目內(nèi)容分別為jsonObj0，jsonObj1
jsonObj2.put("item0", jsonObj0);
jsonObj2.put("item1", jsonObj);
System.out.println("jsonObj2:"+jsonObj2);
//創(chuàng)建jsonObj3，只有一個條目，內(nèi)容為jsonObj2
jsonObj3.element("j3", jsonObj2);
System.out.println("jsonObj3:"+jsonObj3);
//往JSONArray中添加JSONObject對象。發(fā)現(xiàn)JSONArray跟JSONObject的區(qū)別就是JSONArray比JSONObject多中括號[]
jsonArray.add(jsonObj);
System.out.println("jsonArray:"+jsonArray);
JSONObject jsonObj4 = new JSONObject();
jsonObj4.element("weather", jsonArray);
System.out.println("jsonObj4:"+jsonObj4);
}
}
輸出結(jié)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"}]}
關(guān)于java bean的處理
創(chuàng)建java對象：
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.將json對象轉(zhuǎn)化為java對象
JSONObject jsonObject = JSONObject.fromObject("{\"no\":\"104\",\"provience\":\"陜西\",\"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.將java對象轉(zhuǎn)化為json對象
將java對象轉(zhuǎn)化為json對象：
Address address = new Address();
address.setNo("104");
address.setProvience("陜西");
address.setRoad("高新路");
address.setStreate("");
JSONArray json = JSONArray.fromObject(address);
log.info(json.toString());
將java對象list轉(zhuǎn)化為json對象：
Address address = new Address();
address.setNo("104");
address.setProvience("陜西");
address.setRoad("高新路");
address.setStreate("");
Address address2 = new Address();
address2.setNo("105");
address2.setProvience("陜西");
address2.setRoad("未央路");
address2.setStreate("張辦");
List list = new ArrayList();
list.add(address);
list.add(address2);
JSONArray json = JSONArray.fromObject(list);
log.info(json.toString());
3.JSONArray轉(zhuǎn)化為list
JSONObject jsonObject = JSONObject.fromObject("{\"no\":\"104\",\"provience\":\"陜西\",\"road\":\"高新路\",\"streate\":\"\"}");
JSONArray jsonArray = new JSONArray();
jsonArray.add("{\"no\":\"104\",\"provience\":\"陜西\",\"road\":\"高新路\",\"streate\":\"\"}");
jsonArray.add("{\"no\":\"104\",\"provience\":\"陜西\",\"road\":\"高新路\",\"streate\":\"123\"}");
Object object = JSONArray.toList(jsonArray,Address.class);
轉(zhuǎn)載：http://www.cnblogs.com/hitwtx/articles/2468633.html