Java:逐行读、写文件、文件目录过滤的用法

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

public class HelloWord {
    public static void main(String[] args) throws IOException {
        String filePath = "my File.txt";
        File file = new File(filePath);
        InputStreamReader inputStreamReader = new InputStreamReader(new FileInputStream(file),"utf-8");
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

        List<String> lineItems=new ArrayList<String>();
        String line = null;
        while ((line = bufferedReader.readLine()) != null) {
            String[] items = line.split(",");

            String item= items[1];
            if(item.indexOf("花园")!=-1){
                lineItems.add(line);
            }
        }

        bufferedReader.close();
        inputStreamReader.close();

        for(String my : lineItems){
            System.out.println(my);
        }
    }
}

•  写文件用法：

　　　　 List<String> lines = new ArrayList<>();
　　　　 String wfilePath="e:\\1.txt";
        File wfile = new File(wfilePath);
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(new FileOutputStream(wfile), "utf-8");
        BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter);
        for (String eLine : lines) {
            bufferedWriter.write(eLine);
            bufferedWriter.newLine();
        }

        bufferedWriter.close();
        outputStreamWriter.close();

        System.out.println("Complete...");

• 文件目录过滤：

实例：

 package com.dx.hibernate5.test;

 import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.OutputStreamWriter;
 import java.io.UnsupportedEncodingException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;

 public class HelloWord {
     public static void main(String[] args) throws IOException {
         String filePath = "E:\\丽水";
         String wfilePath = "E:\\丽水_New";
         parserCountyVsCode(filePath);

         parseCityCounty(filePath, wfilePath);

         System.out.println("Complete...");
     }

     private static void parserCountyVsCode(String filePath)
             throws UnsupportedEncodingException, FileNotFoundException, IOException {
         File file = new File(filePath);
         InputStreamReader inputStreamReader = new InputStreamReader(new FileInputStream(file), "utf-8");
         BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
         // 缙云县:5782
         // 云和县:5784
         // 开发区:578B
         // 龙泉市:5786
         // 景宁县:5789
         // 青田县:5783
         // 景宁畲族自治县:5789
         // 松阳县:5788
         // 庆元县:5785
         // 莲都区:5781
         // 遂昌县:5787
         List<String> countyList = new ArrayList<>();
         countyList.add("5782");
         countyList.add("5784");
         countyList.add("578B");
         countyList.add("5786");
         countyList.add("5789");
         countyList.add("5783");
         countyList.add("5788");
         countyList.add("5785");
         countyList.add("5781");
         countyList.add("5787");

         Map<String, String> lineItems = new HashMap<String, String>();
         String line = null;
         while ((line = bufferedReader.readLine()) != null) {
             String[] items = line.split(",");

             String address = items[3];
             String county = items[2];

             if (address.indexOf("莲都区") != -1) {
                 lineItems.put("莲都区", county);
             } else if (address.indexOf("开发区") != -1) {
                 lineItems.put("开发区", county);
             } else if (address.indexOf("青田县") != -1) {
                 lineItems.put("青田县", county);
             } else if (address.indexOf("缙云县") != -1) {
                 lineItems.put("缙云县", county);
             } else if (address.indexOf("遂昌县") != -1) {
                 lineItems.put("遂昌县", county);
             } else if (address.indexOf("松阳县") != -1) {
                 lineItems.put("松阳县", county);
             } else if (address.indexOf("云和县") != -1) {
                 lineItems.put("云和县", county);
             } else if (address.indexOf("庆元县") != -1) {
                 lineItems.put("庆元县", county);
             } else if (address.indexOf("景宁县") != -1 || address.indexOf("景宁畲族自治县") != -1) {
                 lineItems.put("景宁县", county);
             } else if (address.indexOf("龙泉市") != -1) {
                 lineItems.put("龙泉市", county);
             } else {
                 Boolean hasContains = false;
                 for (String coun : countyList) {
                     if (coun.equals(county)) {
                         hasContains = true;
                     }
                 }
                 if (!hasContains) {
                     System.out.println(line);
                 }
             }
         }

         bufferedReader.close();
         inputStreamReader.close();

         for (Map.Entry<String, String> kvEntry : lineItems.entrySet()) {
             System.out.println(kvEntry.getKey() + ":" + kvEntry.getValue());
         }
     }

     private static void parseCityCounty(String filePath, String wfilePath)
             throws UnsupportedEncodingException, FileNotFoundException, IOException {
         Map<String, String> idVsCountry = new HashMap<>();
         idVsCountry.put("5782", "缙云县");
         idVsCountry.put("5784", "云和县");
         idVsCountry.put("578B", "开发区");
         idVsCountry.put("5786", "龙泉市");
         idVsCountry.put("5789", "景宁县");
         idVsCountry.put("5783", "青田县");
         idVsCountry.put("5788", "松阳县");
         idVsCountry.put("5785", "庆元县");
         idVsCountry.put("5781", "莲都区");
         idVsCountry.put("5787", "遂昌县");

         List<String> lines = new ArrayList<>();
         lines.add("abc0");
         lines.add("abc1");
         lines.add("abc2");
         File file = new File(filePath);
         InputStreamReader inputStreamReader = new InputStreamReader(new FileInputStream(file), "utf-8");
         BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
         String line = null;
         while ((line = bufferedReader.readLine()) != null) {
             String[] items = line.split(",");

             String address = items[3];
             String county = items[2];
             String newLine = items[0] + ",丽水市," + idVsCountry.get(county) + "," + address;
             // System.out.println(newLine);
             lines.add(newLine);
         }

         bufferedReader.close();
         inputStreamReader.close();

         File wfile = new File(wfilePath);
         OutputStreamWriter outputStreamWriter = new OutputStreamWriter(new FileOutputStream(wfile), "utf-8");
         BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter);
         for (String eLine : lines) {
             bufferedWriter.write(eLine);
             bufferedWriter.newLine();
         }

         bufferedWriter.close();
         outputStreamWriter.close();
     }
 }