Exception in thread "main" java.lang.NullPointerException报错怎么解决

源自：3-4 从文件读取JSON

Exception in thread "main" java.lang.NullPointerException报错怎么解决

package bean;

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;
import org.json.JSONException;
import org.json.JSONObject;

public class ReadJson {

   public static void main(String[] args) throws IOException, JSONException{

       File fi = new File(ReadJson.class.getResource("/wangxiaoer.json").getFile());

       String content = FileUtils.readFileToString(fi);
       JSONObject JO= new JSONObject(content);
        System.out.println("姓名是："+JO.getString("name"));
   }
}

提问者：qq_Onecallaway_1 2019-02-15 20:04

个回答

慕移动3754471

2021-02-18 22:59:45

      //ReadJSONSample.class.getResource 为项目的资源目录路径，请保证文件存在
        File file=new File(ReadJSONSample.class.getResource("/wangxiaoer.json").getFile());

        // 或者指定文件目录，请保证文件存存
//File file = new File("/tmp/wangxiaoer.json");

        //
String content = FileUtils.readFileToString(file, StandardCharsets.UTF_8);
JSONObject jsonObject = new JSONObject(content);
System.out.println("name is " + jsonObject.getString("name"));
System.out.println("age is " + jsonObject.getDouble("age"));

0

qq_a沙漏中的时光_0: 2019-02-17 13:12:26

把

jsonContent.json

放到resouces 路径下。在如下读取
File file = new File(ReadJsonSample.class.getClassLoader().getResource("./jsonContent.json").getPath());