JAVA FileUtils(文件读写以及操作工具类)

Posted 2021-02-01 xuexidememeda

转别人的合并的链接 //https://www.cnblogs.com/chenhuan001/p/6575053.html

  //https://blog.csdn.net/lovoo/article/details/77899627

第一个链接找不到了作者看见了说一下我给你上链接（但是你的名字信息没改哈！！）

package com;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;

/**
 * <p>文件操作工具类<p>
 * @version 1.0
 * @author li_hao
 * @date 2017年1月18日
 */
@SuppressWarnings({"resource","unused"})
public class FileUtils {
  
  /**
   * 获取windows/linux的项目根目录
   * @return
   */
  public static String getConTextPath(){
    String fileUrl = Thread.currentThread().getContextClassLoader().getResource("").getPath();
    if("usr".equals(fileUrl.substring(1,4))){
      fileUrl = (fileUrl.substring(0,fileUrl.length()-16));//linux
    }else{
      fileUrl = (fileUrl.substring(1,fileUrl.length()-16));//windows
    }
    return fileUrl;
  }
    
  /**
   * 字符串转数组
   * @param str 字符串
   * @param splitStr 分隔符
   * @return
   */
  public static String[] StringToArray(String str,String splitStr){
    String[] arrayStr = null;
    if(!"".equals(str) && str != null){
      if(str.indexOf(splitStr)!=-1){
        arrayStr = str.split(splitStr);
      }else{
        arrayStr = new String[1];
        arrayStr[0] = str;
      }
    }
    return arrayStr;
  }
    
  /**
   * 读取文件
   * 
   * @param Path
   * @return
   */
  public static String ReadFile(String Path) {
    BufferedReader reader = null;
    String laststr = "";
    try {
      FileInputStream fileInputStream = new FileInputStream(Path);
      InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "UTF-8");
      reader = new BufferedReader(inputStreamReader);
      String tempString = null;
      while ((tempString = reader.readLine()) != null) {
        laststr += tempString;
      }
      reader.close();
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      if (reader != null) {
        try {
          reader.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }
    return laststr;
  }
    
  /**
   * 获取文件夹下所有文件的名称 + 模糊查询（当不需要模糊查询时，queryStr传空或null即可）
   * 1.当路径不存在时，map返回retType值为1
   * 2.当路径为文件路径时，map返回retType值为2，文件名fileName值为文件名
   * 3.当路径下有文件夹时，map返回retType值为3，文件名列表fileNameList，文件夹名列表folderNameList
   * @param folderPath 路径
   * @param queryStr 模糊查询字符串
   * @return
   */
  public static HashMap<String, Object> getFilesName(String folderPath , String queryStr) {
    HashMap<String, Object> map = new HashMap<>();
    List<String> fileNameList = new ArrayList<>();//文件名列表
    List<String> folderNameList = new ArrayList<>();//文件夹名列表
    File f = new File(folderPath);
    if (!f.exists()) { //路径不存在
      map.put("retType", "1");
    }else{
      boolean flag = f.isDirectory();
      if(flag==false){ //路径为文件
        map.put("retType", "2");
        map.put("fileName", f.getName());
      }else{ //路径为文件夹
        map.put("retType", "3");
        File fa[] = f.listFiles();
        queryStr = queryStr==null ? "" : queryStr;//若queryStr传入为null,则替换为空（indexOf匹配值不能为null）
        for (int i = 0; i < fa.length; i++) {
          File fs = fa[i];
          if(fs.getName().indexOf(queryStr)!=-1){
             if (fs.isDirectory()) {
               folderNameList.add(fs.getName());
             } else {
               fileNameList.add(fs.getName());
             }
           }
        }
        map.put("fileNameList", fileNameList);
        map.put("folderNameList", folderNameList);
      }
    }
    return map;
  }
  
  /**
   * 以行为单位读取文件，读取到最后一行
   * @param filePath
   * @return
   */
  public static List<String> readFileContent(String filePath) { 
    BufferedReader reader = null;
    List<String> listContent = new ArrayList<>();
    try { 
      reader = new BufferedReader(new FileReader(filePath)); 
      String tempString = null; 
      int line = 1; 
      // 一次读入一行，直到读入null为文件结束 
      while ((tempString = reader.readLine()) != null) {
        listContent.add(tempString);
        line++;
      } 
      reader.close(); 
    } catch (IOException e) { 
      e.printStackTrace(); 
    } finally { 
      if (reader != null) { 
        try { 
          reader.close(); 
        } catch (IOException e1) { 
        } 
      } 
    }
    return listContent;
  } 
  
  /**
   * 读取指定行数据 ，注意：0为开始行
   * @param filePath
   * @param lineNumber
   * @return
   */
  public static String readLineContent(String filePath,int lineNumber){
    BufferedReader reader = null;
    String lineContent="";
    try {
      reader = new BufferedReader(new FileReader(filePath));
      int line=0;
      while(line<=lineNumber){
        lineContent=reader.readLine();
        line++;
      }
      reader.close();
    } catch (IOException e) { 
      e.printStackTrace(); 
    } finally { 
      if (reader != null) { 
        try { 
          reader.close(); 
        } catch (IOException e1) { 
        } 
      } 
    } 
    return lineContent;
  }
  
  /**
   * 读取从beginLine到endLine数据（包含beginLine和endLine），注意：0为开始行
   * @param filePath
   * @param beginLineNumber 开始行
   * @param endLineNumber 结束行
   * @return
   */
  public static List<String> readLinesContent(String filePath,int beginLineNumber,int endLineNumber){
    List<String> listContent = new ArrayList<>();
    try{
      int count = 0;
    BufferedReader reader = new BufferedReader(new FileReader(filePath));
      String content = reader.readLine();
      while(content !=null){
        if(count >= beginLineNumber && count <=endLineNumber){
          listContent.add(content);
        }  
        content = reader.readLine();
        count++;  
      }
    } catch(Exception e){
    }
    return listContent;
  }
    
  /**
   * 读取若干文件中所有数据
   * @param listFilePath
   * @return
   */
  public static List<String> readFileContent_list(List<String> listFilePath) { 
    List<String> listContent = new ArrayList<>();
    for(String filePath : listFilePath){
       File file = new File(filePath);
       BufferedReader reader = null;
      try { 
        reader = new BufferedReader(new FileReader(file)); 
        String tempString = null; 
        int line = 1; 
        // 一次读入一行，直到读入null为文件结束 
        while ((tempString = reader.readLine()) != null) {
          listContent.add(tempString);
          line++;
        } 
        reader.close(); 
      } catch (IOException e) { 
        e.printStackTrace(); 
      } finally { 
        if (reader != null) { 
          try { 
            reader.close(); 
          } catch (IOException e1) { 
          } 
        } 
      }
    }
    return listContent;
  }
  
  /**
   * 文件数据写入（如果文件夹和文件不存在，则先创建，再写入）
   * @param filePath
   * @param content
   * @param flag true:如果文件存在且存在内容，则内容换行追加；false:如果文件存在且存在内容，则内容替换
   */
  public static String fileLinesWrite(String filePath,String content,boolean flag){
    String filedo = "write";
    FileWriter fw = null;
    try {
      File file=new File(filePath);
      //如果文件夹不存在，则创建文件夹
      if (!file.getParentFile().exists()){
        file.getParentFile().mkdirs();
      }
      if(!file.exists()){//如果文件不存在，则创建文件,写入第一行内容
        file.createNewFile();
        fw = new FileWriter(file);
        filedo = "create";
      }else{//如果文件存在,则追加或替换内容
        fw = new FileWriter(file, flag);
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
      PrintWriter pw = new PrintWriter(fw);
      pw.println(content);
      pw.flush();
    try {
      fw.flush();
      pw.close();
      fw.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
    return filedo;
  }
      
  /**
   * 写文件
   * @param ins
   * @param out
   */
  public static void writeIntoOut(InputStream ins, OutputStream out) {
    byte[] bb = new byte[10 * 1024];
    try {
      int cnt = ins.read(bb);
      while (cnt > 0) {
        out.write(bb, 0, cnt);
        cnt = ins.read(bb);
      }
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        out.flush();
        ins.close();
        out.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
  
  /**
   * 判断list中元素是否完全相同（完全相同返回true,否则返回false）
   * @param list
   * @return
   */
  private static boolean hasSame(List<? extends Object> list){ 
    if(null == list) 
      return false; 
    return 1 == new HashSet<Object>(list).size(); 
  } 
  
  /**
   * 判断list中是否有重复元素（无重复返回true,否则返回false）
   * @param list
   * @return
   */
  private static boolean hasSame2(List<? extends Object> list){ 
    if(null == list) 
      return false; 
    return list.size() == new HashSet<Object>(list).size(); 
  } 
  
  /**
   * 增加/减少天数
   * @param date
   * @param num
   * @return
   */
  public static Date DateAddOrSub(Date date, int num) { 
    Calendar startDT = Calendar.getInstance(); 
    startDT.setTime(date); 
    startDT.add(Calendar.DAY_OF_MONTH, num); 
    return startDT.getTime(); 
  }
  //https://www.cnblogs.com/chenhuan001/p/6575053.html
  /**
   * 递归删除文件或者目录
   * @param file_path
   */
  public static void deleteEveryThing(String file_path) {
	    try{
	        File file=new File(file_path);
	        if(!file.exists()){
	            return ;
	        }
	        if(file.isFile()){
	            file.delete();
	        }else{
	            File[] files = file.listFiles();
	            for(int i=0;i<files.length;i++){
	                String root=files[i].getAbsolutePath();//得到子文件或文件夹的绝对路径
	                deleteEveryThing(root);
	            }
	            file.delete();
	        }
	    } catch(Exception e) {
	        System.out.println("删除文件失败");
	    }
	    }
  /**
   * 创建目录
   * @param dir_path
   */
  public static void mkDir(String dir_path) {
      File myFolderPath = new File(dir_path);   
      try {   
          if (!myFolderPath.exists()) {   
             myFolderPath.mkdir();   
          }   
      } catch (Exception e) {   
    	  System.out.println("新建目录操作出错");   
          e.printStackTrace();   
      }  
  }
  
  //https://blog.csdn.net/lovoo/article/details/77899627
  /**
   * 判断指定的文件是否存在。
   *
   * @param fileName
   * @return
   */
  public static boolean isFileExist(String fileName) {
      return new File(fileName).isFile();
  }

  /* 得到文件后缀名
  *
  * @param fileName
  * @return
  */
 public static String getFileExt(String fileName) {
     int point = fileName.lastIndexOf(‘.‘);
     int length = fileName.length();
     if (point == -1 || point == length - 1) {
         return "";
     } else {
         return fileName.substring(point + 1, length);
     }
 }

 /**
  * 删除文件夹及其下面的子文件夹
  *
  * @param dir
  * @throws IOException
  */
 public static void deleteDir(File dir) throws IOException {
     if (dir.isFile())
         throw new IOException("IOException -> BadInputException: not a directory.");
     File[] files = dir.listFiles();
     if (files != null) {
         for (int i = 0; i < files.length; i++) {
             File file = files[i];
             if (file.isFile()) {
                 file.delete();
             } else {
                 deleteDir(file);
             }
         }
     }
     dir.delete();
 }

 /**
  * 复制文件
  *
  * @param src
  * @param dst
  * @throws Exception
  */
 public static void copy(File src, File dst) throws Exception {
     int BUFFER_SIZE = 4096;
     InputStream in = null;
     OutputStream out = null;
     try {
         in = new BufferedInputStream(new FileInputStream(src), BUFFER_SIZE);
         out = new BufferedOutputStream(new FileOutputStream(dst), BUFFER_SIZE);
         byte[] buffer = new byte[BUFFER_SIZE];
         int len = 0;
         while ((len = in.read(buffer)) > 0) {
             out.write(buffer, 0, len);
         }
     } catch (Exception e) {
         throw e;
     } finally {
         if (null != in) {
             try {
                 in.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
             in = null;
         }
         if (null != out) {
             try {
                 out.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
             out = null;
         }
     }
 }

  
}