Json对象与集合对象互转

下面来看看Json对象是如何与集合对象互转

package com.test;

import net.sf.json.JSONArray; 
import net.sf.json.JSONObject; 

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.Iterator; 
import java.util.List; 
import java.util.Map; 
public class FileDemo05{  

	// json字符串转 
	private static String diskListContent = "[{\"n1\":\"asd\",\"n2\":22,\"n3\":\"45.40GB\"," 
	+ "\"n4\":\"qwerty\",\"n5\":\"asd\",}," 
	+ "{\"n1\":\"local\"," 
	+ "\"n2\":1,\"n3\":\"279.40GB\",\"n4\":\"ST3300656SS\",\"n5\":\"\\/devm\\/d0\"}]"; 

	/*** 
	* json字符串转java List 
	* 
	* @param rsContent 
	* @return 
	* @throws Exception 
	*/ 
	private static List<Map<String, String>> jsonStringToList(String rsContent) 
	throws Exception { 
	JSONArray arry = JSONArray.fromObject(rsContent); 
	System.out.println("json字符串内容如下"); 
	System.out.println(arry); 
	List<Map<String, String>> rsList = new ArrayList<Map<String, String>>(); 
	for (int i = 0; i < arry.size(); i++) { 
	JSONObject jsonObject = arry.getJSONObject(i); 
	Map<String, String> map = new HashMap<String, String>(); 
	for (Iterator<?> iter = jsonObject.keys(); iter.hasNext();) { 
	String key = (String) iter.next(); 
	String value = jsonObject.get(key).toString(); 
	map.put(key, value); 
	} 
	rsList.add(map); 
	} 
	return rsList; 
	} 

	/** 
	* @param args 
	* @throws Exception 
	*/ 
	public static void main(String[] args) throws Exception { 
	List<Map<String, String>> list1 = jsonStringToList(diskListContent); 
	System.out.println("json字符串成map"); 
	for (Map<String, String> m : list1) { 
	System.out.println(m); 
	} 
	System.out.println("map转换成json字符串"); 
	for (Map<String, String> m : list1) { 
	JSONArray jsonArray = JSONArray.fromObject(m); 
	System.out.println(jsonArray.toString()); 
	} 
	System.out.println("list转换成json字符串"); 
	JSONArray jsonArray2 = JSONArray.fromObject(list1); 
	System.out.println(jsonArray2.toString()); 
	} 
	} 

输出结果：
json字符串内容如下
[{"n1":"asd","n2":22,"n3":"45.40GB","n4":"qwerty","n5":"asd"},{"n1":"local","n2":1,"n3":"279.40GB","n4":"ST3300656SS","n5":"/devm/d0"}]
json字符串成map
{n1=asd, n5=asd, n4=qwerty, n3=45.40GB, n2=22}
{n1=local, n5=/devm/d0, n4=ST3300656SS, n3=279.40GB, n2=1}
map转换成json字符串
[{"n1":"asd","n5":"asd","n4":"qwerty","n3":"45.40GB","n2":"22"}]
[{"n1":"local","n5":"/devm/d0","n4":"ST3300656SS","n3":"279.40GB","n2":"1"}]
list转换成json字符串
[{"n1":"asd","n5":"asd","n4":"qwerty","n3":"45.40GB","n2":"22"},{"n1":"local","n5":"/devm/d0","n4":"ST3300656SS","n3":"279.40GB","n2":"1"}]