json的list转换

package test;

import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;


import net.sf.json.JSONArray;

public class TestJson {
	String a;
	String b;
	
public String getA() {
		return a;
	}

	public void setA(String a) {
		this.a = a;
	}

	public String getB() {
		return b;
	}

	public void setB(String b) {
		this.b = b;
	}

@Override
	public String toString() {
		return "TestJson [a=" + a + ", b=" + b + "]";
	}

public TestJson(){
}
public TestJson(String a,String b){
	this.a=a;
	this.b=b;
}
	
	public static void main(String[] args) {
		List<TestJson> ls=new ArrayList<TestJson>();
		ls.add(new TestJson("1","2"));
		ls.add(new TestJson("3","4"));
		
		byte[] te=getBuffers(ls);
		String str=new String(te);
		System.out.println(str);
	}
	
	
	private static byte[] getBuffers(List<TestJson> ls) {
		ByteBuffer buffer = null ;
		
		String json = JSONArray.fromObject(ls).toString();
		System.out.println(json);
			try {
				buffer = ByteBuffer.allocate(json.getBytes("UTF-8").length);
				buffer.put(json.getBytes("UTF-8"));
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
		}
		if(buffer!=null){
			return buffer.array();
		}else{
			return new byte[0];
		}
	}

}