双层嵌套json字符串(即json对象内嵌json数组)解析为Map

之前我层写过一篇文章,介绍了json与map的相互转化,但当时只涉及到单一的json对象或json数组,对json对象内嵌套这json数组的json字符串无法处理,这篇文章主要解决这个问题。 
之前的那篇文章址:http://blog.csdn.net/u012116457/article/details/24371877 
首先要在项目中导入json的jar包: 
这里写图片描述

 

在下面的代码中处理json对象既使用了net.sf.json.JSONObject 也使用了org.json.JSONObject 两个的包都要导。

首先在E盘下创建一个priceJson.txt,写入一下内容:

{
    "height":1,
    "width":1,
    "location":[
               {
               "顶部":"3"
               },{
               "底部":"1"
               },{
               "左侧":"2"
               },{
               "右侧":"1"
               },{
               "悬浮":"4"
               }
    ],
    "type":[
             {
               "1":"1"
               },{
               "2":"2"
               },{
               "3":"4"
               },{
               "4":"4"
               }
    ]
}

下面的类会通过read方法将文件中的json串读取出来,通过getMapByJson获取到map:

package com.ngsh.common;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import net.sf.json.JSONObject;

import org.json.JSONArray;

public class FileIO {

    //读文件
    public String read(String path){
        String data = "";
        File file = new File(path);
        if(file.isFile()&&file.exists()){
            try {
                InputStreamReader read = new InputStreamReader(
                    new FileInputStream(file),"utf-8");//考虑到编码格式
                BufferedReader bufferedReader = new BufferedReader(read);
                String lineTxt = null;
                while((lineTxt = bufferedReader.readLine()) != null){
                    data +=lineTxt;
                }
                read.close();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }catch (IOException e) {
                e.printStackTrace();
            }

        }
        return data;

    }
    //将json转换为map
    public Map<String, Object> getMapByJson(String json) {
        Map<String, Object> map = new HashMap<String, Object>();
        // 最外层解析
        JSONObject object = object = JSONObject.fromObject(json);
        for (Object k : object.keySet()) {
            Object v = object.get(k);
            map.put(k.toString(), v);
        }
        Map<String, Object> map2 = new HashMap<String, Object>();
        //第二层解析 第二层可能是 也可能不是
        for(Map.Entry<String, Object> entry:map.entrySet()){
            try {
                JSONArray array = new JSONArray(entry.getValue().toString());  //判断是否是json数组

                //是json数组
                for (int i = 0; i < array.length(); i++) {
                    org.json.JSONObject object2 = array.getJSONObject(i);//json数组对象
                    JSONObject object3 = JSONObject.fromObject(object2.toString());  //json对象
                    for (Object k : object3.keySet()) {
                        Object v = object3.get(k);
                        map2.put(k.toString(), v);
                    }
                }
            } catch (Exception e) {  //不是json串数组
                map2.put(entry.getKey(), entry.getValue());
            }
        }
    /*  for(Map.Entry<String, Object> entry:map2.entrySet()){
            System.out.println(entry.getKey()+"-"+entry.getValue());
        }
    */
        return map2;
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
         String path="E:\\priceJson.txt";
         FileIO fo = new FileIO();
         Map map = fo.getMapByJson(fo.read(path));
         for(Map.Entry<String, Object> entry:map.entrySet()){
            System.out.println("key:"+entry.getKey()+"-value:"+entry.getValue());
        }
    }

}

运行结果如下:

key:3-value:4
key:2-value:2
key:1-value:1
key:height-value:1
key:左侧-value:2
key:4-value:4
key:width-value:1
key:底部-value:1
key:悬浮-value:4
key:右侧-value:1
key:顶部-value:3

 

posted @ 2017-11-01 16:09  烟雨观春柳  阅读(543)  评论(0编辑  收藏  举报