JAVA读取JSON文件工具类

package com.admin.sys.utils;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.apache.poi.ss.formula.functions.T;

import java.io.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class readJSON {
/**
* 通过本地文件访问json并读取
*
* @param path：json文件路径
* @return：json文件的内容
*/
public static String ReadFile(String mypath) {
String path = new File(mypath).getAbsolutePath();
StringBuffer laststr = new StringBuffer();
File file = new File(path);// 打开文件
BufferedReader reader = null;
try {
FileInputStream in = new FileInputStream(file);
reader = new BufferedReader(new InputStreamReader(in, "UTF-8"));// 读取文件
String tempString = null;
while ((tempString = reader.readLine()) != null) {
laststr = laststr.append(tempString);
}
reader.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException el) {
}
}
}
return laststr.toString();
}
public static void main(String args[]) {
String filePath = "src/main/resources/JSON/flow_data.json";
String jsonString = ReadFile(filePath);
JSONObject jsonObj = JSONObject.parseObject(jsonString); // 将JSON字符串转换为JSONObject对象
JSONArray jsonArray = jsonObj.getJSONArray("1407072600");
System.out.println(jsonArray);
}
}