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:
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
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