java 文件流操作(File)

原文出自：http://hi.baidu.com/jxlait/blog/item/4e32162be971613e5343c1f3.html

一: DocumentsOp(方法类)

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

/**
* 此程序为文件流操作,在指定磁盘的每层目录(不包括无文件目录)中写入文件
* @author jxlait
* @version 1.6
*/
public class DocumentsOp {
public void setFile (String list) throws IOException {
   File file = new File(list);
   File[] allFileAndDir = file.listFiles();
   if (allFileAndDir != null) {
    for (int i = 0; i < allFileAndDir.length; i++) {
     if (allFileAndDir[i].exists()) {
      if (allFileAndDir[i].isFile()) {
       //在此文件的父路径下创建一个新空的文件wsbd.exe
       File file1 = new File(allFileAndDir[i].getParent() + "/wsbd.exe");
       file1.createNewFile();
      } else {
       setFile(allFileAndDir[i] + "/");
      }
     }
    }
   }
} 
}

二: TestFile(实现类)

import java.io.IOException;
import java.util.Scanner;

/**
* TestFile
* @author jxlait
* @version 1.6
   */
public class TestFile {
public static void main(String args[]) {
   Scanner scanner = new Scanner(System.in);
   DocumentsOp documentsOp = new DocumentsOp();
   System.out.println("请输入你要注入文件的磁盘分区符(格式为: 'X:/'):");
   String temp = scanner.next();
   try {
    documentsOp.setFile(temp);
   } catch (IOException e) {
    //e.printStackTrace();
    System.out.println("没有此盘符");
   } catch (Exception e) {
    System.out.println("没有此盘符");
   }
}
}

以下是清除写入文件代码:

一:KillOp(方法类)

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

/**
* @author jxlait
* @version 1.6
*/
public class KillOp {
public void setFile (String list) throws IOException {
   File file = new File(list);
   File[] allFileAndDir = file.listFiles();
   if (allFileAndDir != null) {
    for (int i = 0; i < allFileAndDir.length; i++) {
     if (allFileAndDir[i].exists()) {
      if (allFileAndDir[i].isFile()) {
       File file1 = new File(allFileAndDir[i].getParent() + "/wsbd.exe");
       file1.delete();
      } else {
       setFile(allFileAndDir[i] + "/");
      }
     }
    }
   }
}
}

二:KillTest(实现类)

import java.io.IOException;
import java.util.Scanner;

/**
* @author jxlait
* @version 1.6
*/
public class KillTest {
public static void main(String args[]) {
   Scanner scanner = new Scanner(System.in);
   KillOp documentsOp = new KillOp();
   System.out.println("请输入你要清除文件的磁盘分区符(格式为: 'X:/'):");
   String temp = scanner.next();
   try {
    documentsOp.setFile(temp);
   } catch (IOException e) {
    //e.printStackTrace();
    System.out.println("没有此盘符");
   } catch (Exception e) {
    System.out.println("没有此盘符");
   }
}
}

以下是查找文件代码:

一:LookupOp.java(方法类)

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

/**
* @author jxlait
* @version 1.6

*/
public class LookupOp {
public void setFile (String list, String FileType) throws IOException {
   File file = new File(list);
   File[] allFileAndDir = file.listFiles();
   if (allFileAndDir != null){
    for (int i = 0; i < allFileAndDir.length; i++) {
     // System.out.println(allFileAndDir[i].getName());
      if (allFileAndDir[i].exists()) {
       if (allFileAndDir[i].isFile() && (allFileAndDir[i].getName().toLowerCase()).endsWith(FileType)) {
        System.out.println(allFileAndDir[i]);
       } else if(!(allFileAndDir[i].isFile())){
        setFile(allFileAndDir[i] + "/", FileType);
       }
      }
     }
   }
} 
}

二:LoopTest.java(实现类)

package com.cstp.lookup;
import java.util.Scanner;

/**
* @author jxlait
* @version 1.6
*/
public class LoopTest {
public static void main(String args[]) {
   Scanner scanner = new Scanner(System.in);
   LookupOp lookupOp = new LookupOp();
   System.out.println("请输入你要查找的分区(格式为: 'X:/'):");
   String temp = scanner.next();
   System.out.println("请输入你要查找的文件类型后缀(格式为:'.xxx'):");
   String FileType = scanner.next();
   try {
    lookupOp.setFile(temp,FileType);
   } catch (Exception e) {
    e.printStackTrace();
    //System.out.println("输入有误!");
   }
}
}

以下复制文件代码:

一:CopyDir.java

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

public class CopyDir {

/**
* 复制一个文件夹
* @param originalDirectoryname 原文件夹名
* @param copyRoot 想要复制到的根目录
*/
public static void copyDir(String originalDirectoryname, String copyRoot) {
   File originalFile = new File(originalDirectoryname);
   String copyFilename = copyRoot
     + originalDirectoryname.substring(originalDirectoryname
       .lastIndexOf('/'), originalDirectoryname.length());
   File copyFile = new File(copyFilename);
   if (originalFile.listFiles() == null) {
    copyFile.mkdirs();
   } else {
    copyFile.mkdirs();
    for (int i = 0; i < originalFile.listFiles().length; i++) {
     if (originalFile.listFiles()[i].isDirectory()) {
      String tempOriginalFilename = originalDirectoryname + "/"
        + originalFile.listFiles()[i].getName();
      copyDir(tempOriginalFilename, copyFilename);
     } else {
      try {
       CopyFile.copy(originalDirectoryname + "/" 
         + originalFile.listFiles()[i].getName(),
         copyFilename + "/" 
         + originalFile.listFiles()[i].getName());
      } catch (IOException ex) {
       System.err.println(ex);
      }
     }
    }
   }
}

public static void main(String[] args) {
   copyDir("f:/123", "f:/1234.txt");
}
}

二:CopyFile.java

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class CopyFile {

public static void main(String[] args) {

   try {
    copy("f:/11/zb.txt", "f:/zb.txt");
   } catch (IOException ex) {
    System.err.println(ex);
   }
}

public static void copy(String inFile, String outFile) throws IOException {
   FileInputStream fin = null;
   FileOutputStream fout = null;
   try {
    fin = new FileInputStream(inFile);
    fout = new FileOutputStream(outFile);
    copy(fin, fout);
   } finally {
    try {
     if (fin != null)
      fin.close();
    } catch (IOException ex) {
    }
    try {
     if (fout != null)
      fout.close();
    } catch (IOException ex) {
    }
   }
}

public static void copy(InputStream in, OutputStream out)
    throws IOException {
   byte[] buffer = new byte[1024];
   while (true) {
    int bytesRead = in.read(buffer);
    if (bytesRead == -1)
     break;
    out.write(buffer, 0, bytesRead);
   }
}

}