如何读取d盘目录保存在list中且显示父子关系

Posted 2023-04-30

参考技术A 有没有那么多.给你个少的:importjava.io.BufferedReader;importjava.io.FileInputStream;importjava.io.FileNotFoundException;importjava.io.FileOutputStream;importjava.io.IOException;importjava.io.InputStreamReader;importjava.io.OutputStreamWriter;importjava.io.PrintWriter;publicclassCopyFilepublicstaticvoidmain(String[]args)throwsFileNotFoundException,IOExceptionCopy("D://a.java","D://text.txt");//第一个是目标文件的目录,第二个是你想拷贝的目录publicstaticvoidCopy(StringF,StringD)throwsIOException,FileNotFoundExceptionStringfile=F;BufferedReaderin=newBufferedReader(newInputStreamReader(newFileInputStream(file),"GBK"));PrintWriterw=newPrintWriter(newOutputStreamWriter(newFileOutputStream(D),"utf-8"));//.readLine();每次读取一行,到\n,\r为止//如果到文件末尾,返回nullStringstr;while((str=in.readLine())!=null)System.out.println(str);w.write(str+"\n");in.close();w.close();追问

保存在list集合中，不是拷贝到另一个目录

读取省市区json文件,插入数据库表,表中保存父子节点对应关系

 java读取省市区json文件, 入库表t_city(code,val,fathercode),  保存父子节点

package manager;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.util.CharsetUtil;
import cn.hutool.json.JSONArray;
import cn.hutool.json.JSONUtil;

public class CityNodeSqlGen 

	public static void main(String[] args) 
		String f = "I:/myData/qq_data/3442175060/FileRecv/cities1.js";
		// String f = "I:/myData/qq_data/3442175060/FileRecv/bj.js";
		File file = new File(f);
		JSONArray jsonArray = JSONUtil.readJSONArray(file, CharsetUtil.charset("UTF-8"));
		// System.out.println(json.toString());
		List<CityNode> list = JSONUtil.toList(jsonArray, CityNode.class);
		// System.out.println(JSONUtil.toJsonStr(cn));
		pro(list);
	

	private static void pro(List<CityNode> list) 
		String sql = null;
		List<String> result = new ArrayList<>();
		for (CityNode t_city : list) 
			String code = t_city.getCode();
			String val = t_city.getValue();
			sql = "insert into t_city(code,val,fathercode) values('" + code + "','" + val + "','" + 0 + "');";//省
//			System.out.println(sql);
			result.add(sql);
			List<CityNode> children = t_city.getChildren();
			for (CityNode city : children) 
				String code1 = city.getCode();
				String val1 = city.getValue();
				sql = "insert into t_city(code,val,fathercode) values('" + code1 + "','" + val1 + "','" + code
						+ "');";//市
//				System.out.println(sql);
				result.add(sql);

				List<CityNode> children2 = city.getChildren();
				if (CollUtil.isNotEmpty(children2)) 
					for (CityNode area : children2) 
						String code2 = area.getCode();
						String val2 = area.getValue();
						sql = "insert into t_city(code,val,fathercode) values('" + code2 + "','" + val2 + "','"
								+ code1 + "');";//区
//						System.out.println(sql);
						result.add(sql);
					
				

			
		
		File file = new File("I:\\\\项目代码和文档\\\\加油站项目\\\\t_city2.sql");
		FileUtil.writeLines(result, file, "utf-8");
	

package manager;

import java.util.List;

import lombok.Data;

@Data
public class CityNode 
	private String code;
	private String value;
	private String label;
	private List<CityNode> children;