Java读取TXT文件并获取字段值

 代码如下：

import java.io.IOException;
import org.apache.commons.io.FileUtils;
import org.json.JSONArray;
import org.json.JSONObject;
import java.io.File;

public class Test {
	public static void main(String[] args) throws IOException {
		 String dirName="文件路径";
			File file = new File(dirName);
			if(!file3.exists() || file3.length() == 0) {
					return;
				}					
		String input = FileUtils.readFileToString(file,"UTF-8");
		JSONObject obj = new JSONObject(input);
								
		//读取文件内容
		
String KeyNo1 = (String)obj.getJSONObject("Result").get("KeyNo");
String CompanyName = (String)obj.getJSONObject("Result").get("CompanyName");									
String UpdateTime = (String)obj.getJSONObject("Result").get("UpdateTime");									
String ControllerDataKeyNo =(String)obj.getJSONObject("Result").getJSONObject("ControllerData").get("KeyNo");
									
		
JSONArray Paths=obj.getJSONObject("Result").getJSONObject("ControllerData").getJSONArray("Paths");
for(int p =0;p < Paths.getJSONArray(0).length();p++) {
JSONObject Paths1 = Paths.getJSONArray(0).getJSONObject(p);
String KeyNo=(String)Paths1.get("KeyNo") ;
    }
String ControlPercent = (String)obj.getJSONObject("Result").getJSONObject("ControllerData").get("ControlPercent");
    }
}

文件内容实例：

{
  "Result" : {
    "KeyNo" : "000111222",
    "CompanyName" : "XXX有限公司",
    "UpdateTime" : "2021-11-12 17:37:23",
    "ControllerData" : {
      "KeyNo" : "123456",
      "Paths" : [ [ {
        "KeyNo" : "123"
      } ] ],
      "ControlPercent" : "100%"
    }
  }
}