JSONArray和JSONObject的使用

首先需要使用如下的jar包：
1.commons-lang.jar
2.commons-beanutils.jar
3.commons-collections.jar
4.commons-logging.jar
5.ezmorph.jar
6.json-lib-2.2.2-jdk15.jar
其次给出一个测试例子：
////////////////////////////
给出一个常见的JavaBean

public class BookInfo {
private String name;
private float price;
private int num;
public BookInfo(){

}
public BookInfo(String name,float price,int num){
this.name=name;
this.price=price;
this.num=num;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public float getPrice() {
return price;
}
public void setPrice(float price) {
this.price = price;
}
public int getNum() {
return num;
}
public void setNum(int num) {
this.num = num;
}


}
///////////////////////////
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class TestJSON {
public TestJSON(){

}
public static void main(String[] args) {

BookInfo book=new BookInfo();
book.setName("java");
book.setNum(10);
book.setPrice(1.5f);
System.out.println(JSONArray.fromObject(book).toString());
//输出[{"name":"java","num":10,"price":1.5}]
BookInfo book2=new BookInfo("C#",31.9f,30);
BookInfo book3=new BookInfo("C#",32.9f,30);
BookInfo book4=new BookInfo("C#",33.9f,30);
BookInfo book5=new BookInfo("C#",35.9f,30);
BookInfo book6=new BookInfo("C#",44.9f,30);
List<BookInfo>list=new ArrayList<BookInfo>();
list.add(book6);list.add(book5);list.add(book4);list.add(book3);list.add(book2);
// 集合list转成json数据
JSONArray array=JSONArray.fromObject(list);
System.out.println("JSONArray格式"+array.size()+"个，内容："+array.toString());
//输出 ：JSONArray格式5个，内容：[{"name":"C#","num":30,"price":44.9},{"name":"C#","num":30,"price":35.9},{"name":"C#","num":30,"price":33.9},{"name":"C#","num":30,"price":32.9},{"name":"C#","num":30,"price":31.9}]

System.out.println("第2个内容是"+array.get(2).toString()+"从第0个开始");
//输出： 第2个内容是{"name":"C#","num":30,"price":33.9}从第0个开始

// map转成json代码
Map map=new HashMap();
map.put("name", "书籍");
map.put("bool", Boolean.TRUE);
map.put("int", new Integer(1));
map.put("arr", new String[] {"a","b"});
map.put("fun", "function(i){return this.arr[i];}");
JSONObject json=JSONObject.fromObject(map);
System.out.println("JSONObject格式："+json.toString());
//输出：JSONObject格式：{"arr":["a","b"],"int":1,"name":"书籍","fun":function(i){return this.arr[i];},"bool":true}

System.out.println(json.get("name")+":"+json.get("fun"));
//输出：书籍:function(i){return this.arr[i];}

// 数据转成JSON
boolean[] boolArray = new boolean[] { true, false, true };  
JSONArray jsonArray1 = JSONArray.fromObject(boolArray);   
System.out.println(jsonArray1.size()); 
//输出：  3
System.out.println("Bean转换成json代码 ");
System.out.println(jsonArray1.toString());
//输出：[true,false,true]
// 一般数据转成JSON
System.out.println(JSONArray.fromObject("['json','is','easy']"));
//输出：["json","is","easy"]
                System.out.println("第0个是："+JSONArray.fromObject("['json','is','easy']").get(0));
//输出：第0个是：json
}

}