JAVA高手来

怎么做个JAVA应用程序，把一个文件复制到指定目录。

java文件复制程序

[url]http://www.easyjf.com/blog.ejf?cmd=doc&id=1048581[/url]
[code="java"]
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

/**

• Title: 文件处理工具类
• Description:实现文件的简单处理,复制文件、目录等
• Copyright: Copyright (c) 2005
• Company: www.easyjf.com
• @author 天一

• @version 1.0
  */
  public class FileUtil {

  /**

  • 复制目录下的文件（不包括该目录）到指定目录，会连同子目录一起复制过去。
  • @param targetFile
  • @param path */ public static void copyFileFromDir(String targetDir, String path) { File file = new File(path); createFile(targetDir, false); if (file.isDirectory()) { copyFileToDir(targetDir, listFile(file)); } }

  /**

  • 复制目录下的文件（不包含该目录和子目录，只复制目录下的文件）到指定目录。
  • @param targetDir
  • @param path */ public static void copyFileOnly(String targetDir, String path) { File file = new File(path); File targetFile = new File(targetDir); if (file.isDirectory()) { File[] files = file.listFiles(); for (File subFile : files) { if (subFile.isFile()) { copyFile(targetFile, subFile); } } } }

  /**

  • 复制目录到指定目录。targetDir是目标目录，path是源目录。
  • 该方法会将path以及path下的文件和子目录全部复制到目标目录
  • @param targetDir
  • @param path */ public static void copyDir(String targetDir, String path) { File targetFile = new File(targetDir); createFile(targetFile, false); File file = new File(path); if (targetFile.isDirectory() && file.isDirectory()) { copyFileToDir(targetFile.getAbsolutePath() + "/" + file.getName(), listFile(file)); } }

  /**

  • 复制一组文件到指定目录。targetDir是目标目录，filePath是需要复制的文件路径
  • @param targetDir
  • @param filePath */ public static void copyFileToDir(String targetDir, String... filePath) { if (targetDir == null || "".equals(targetDir)) { System.out.println("参数错误，目标路径不能为空"); return; } File targetFile = new File(targetDir); if (!targetFile.exists()) { targetFile.mkdir(); } else { if (!targetFile.isDirectory()) { System.out.println("参数错误，目标路径指向的不是一个目录！"); return; } } for (String path : filePath) { File file = new File(path); if (file.isDirectory()) { copyFileToDir(targetDir + "/" + file.getName(), listFile(file)); } else { copyFileToDir(targetDir, file, ""); } } }

  /**

  • 复制文件到指定目录。targetDir是目标目录，file是源文件名，newName是重命名的名字。
  • @param targetFile
  • @param file
  • @param newName */ public static void copyFileToDir(String targetDir, File file, String newName) { String newFile = ""; if (newName != null && !"".equals(newName)) { newFile = targetDir + "/" + newName; } else { newFile = targetDir + "/" + file.getName(); } File tFile = new File(newFile); copyFile(tFile, file); }

  /**

  • 复制文件。targetFile为目标文件，file为源文件
  • @param targetFile
  • @param file */ public static void copyFile(File targetFile, File file) { if (targetFile.exists()) { System.out.println("文件" + targetFile.getAbsolutePath() + "已经存在，跳过该文件！"); return; } else { createFile(targetFile, true); } System.out.println("复制文件" + file.getAbsolutePath() + "到" + targetFile.getAbsolutePath()); try { InputStream is = new FileInputStream(file); FileOutputStream fos = new FileOutputStream(targetFile); byte[] buffer = new byte[1024]; while (is.read(buffer) != -1) { fos.write(buffer); } is.close(); fos.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }

  public static String[] listFile(File dir) {
  String absolutPath = dir.getAbsolutePath();
  String[] paths = dir.list();
  String[] files = new String[paths.length];
  for (int i = 0; i < paths.length; i++) {
  files[i] = absolutPath + "/" + paths[i];
  }
  return files;
  }

  public static void createFile(String path, boolean isFile){
  createFile(new File(path), isFile);
  }

  public static void createFile(File file, boolean isFile) {
  if (!file.exists()) {
  if (!file.getParentFile().exists()) {
  createFile(file.getParentFile(), false);
  } else {
  if (isFile) {
  try {
  file.createNewFile();
  } catch (IOException e) {
  e.printStackTrace();
  }
  } else {
  file.mkdir();
  }
  }
  }
  }

}[/code]

[code="java"]String ret=new String();
try
{
byte[] bytes=new byte[102400];
InputStream in=new FileInputStream("c:/aaa.doc");
in.read(bytes);
ret=new sun.misc.BASE64Encoder().encode(bytes); //具体的编码方法
in.close();
}
catch(FileNotFoundException e)
{
e.printStackTrace();
}
catch(java.io.IOException ex)
{
ex.printStackTrace();
}
out.println(ret);

byte[] bytes = new sun.misc.BASE64Decoder().decodeBuffer(ret);

java.io.ByteArrayInputStream inStream=new java.io.ByteArrayInputStream(bytes);
byte[] buffer =new byte[1444];
FileOutputStream fs=new FileOutputStream( "d:/aaa.doc");
int bytesum=0;
int byteread=0;

while ((byteread=inStream.read(buffer))!=-1)
{

bytesum+=byteread;
fs.write(buffer,0,byteread);
} [/code]

文件拷贝：
[code="java"]
int bytesum=0;
int byteread=0;
//file:读到流中
InputStream inStream=new FileInputStream("c://测试//newFile.txt");
FileOutputStream fs=new FileOutputStream( "c://测试//copyFile.txt");
byte[] buffer =new byte[1444];
int length;
while ((byteread=inStream.read(buffer))!=-1)
{
out.println("

"+byteread+"

");
bytesum+=byteread;
out.println(bytesum);
fs.write(buffer,0,byteread);
}
inStream.close(); [/code]

[code="java"]package test;

import java.io.*;

public class FileOperate {
public FileOperate() {
}

/**
 * 新建目录
 * 
 * @param folderPath
 *            String 如 c:/fqf
 * @return boolean
 */
public void newFolder(String folderPath) {
    try {
        String filePath = folderPath;
        filePath = filePath.toString();
        java.io.File myFilePath = new java.io.File(filePath);
        if (!myFilePath.exists()) {
            myFilePath.mkdir();
        }
    } catch (Exception e) {
        System.out.println("新建目录操作出错 ");
        e.printStackTrace();
    }
}

/**
 * 新建文件
 * 
 * @param filePathAndName
 *            String 文件路径及名称 如c:/fqf.txt
 * @param fileContent
 *            String 文件内容
 * @return boolean
 */
public void newFile(String filePathAndName, String fileContent) {

    try {
        String filePath = filePathAndName;
        filePath = filePath.toString();
        File myFilePath = new File(filePath);
        if (!myFilePath.exists()) {
            myFilePath.createNewFile();
        }
        FileWriter resultFile = new FileWriter(myFilePath);
        PrintWriter myFile = new PrintWriter(resultFile);
        String strContent = fileContent;
        myFile.println(strContent);
        resultFile.close();

    } catch (Exception e) {
        System.out.println("新建目录操作出错 ");
        e.printStackTrace();

    }

}

/**
 * 删除文件
 * 
 * @param filePathAndName
 *            String 文件路径及名称 如c:/fqf.txt
 * @param fileContent
 *            String
 * @return boolean
 */
public void delFile(String filePathAndName) {
    try {
        String filePath = filePathAndName;
        filePath = filePath.toString();
        java.io.File myDelFile = new java.io.File(filePath);
        myDelFile.delete();

    } catch (Exception e) {
        System.out.println("删除文件操作出错 ");
        e.printStackTrace();

    }

}

/**
 * 删除文件夹
 * 
 * @param filePathAndName
 *            String 文件夹路径及名称 如c:/fqf
 * @param fileContent
 *            String
 * @return boolean
 */
public void delFolder(String folderPath) {
    try {
        delAllFile(folderPath); // 删除完里面所有内容
        String filePath = folderPath;
        filePath = filePath.toString();
        java.io.File myFilePath = new java.io.File(filePath);
        myFilePath.delete(); // 删除空文件夹

    } catch (Exception e) {
        System.out.println("删除文件夹操作出错 ");
        e.printStackTrace();

    }

}

/**
 * 删除文件夹里面的所有文件
 * 
 * @param path
 *            String 文件夹路径 如 c:/fqf
 */
public void delAllFile(String path) {
    File file = new File(path);
    if (!file.exists()) {
        return;
    }
    if (!file.isDirectory()) {
        return;
    }
    String[] tempList = file.list();
    File temp = null;
    for (int i = 0; i < tempList.length; i++) {
        if (path.endsWith(File.separator)) {
            temp = new File(path + tempList[i]);
        } else {
            temp = new File(path + File.separator + tempList[i]);
        }
        if (temp.isFile()) {
            temp.delete();
        }
        if (temp.isDirectory()) {
            delAllFile(path + "/ " + tempList[i]);// 先删除文件夹里面的文件
            delFolder(path + "/ " + tempList[i]);// 再删除空文件夹
        }
    }
}

/**
 * 复制单个文件
 * 
 * @param oldPath
 *            String 原文件路径 如：c:/fqf.txt
 * @param newPath
 *            String 复制后路径 如：f:/fqf.txt
 * @return boolean
 */
public void copyFile(String oldPath, String newPath) {
    try {
        int bytesum = 0;
        int byteread = 0;
        File oldfile = new File(oldPath);
        if (oldfile.exists()) { // 文件存在时
            InputStream inStream = new FileInputStream(oldPath); // 读入原文件
            FileOutputStream fs = new FileOutputStream(newPath);
            byte[] buffer = new byte[1444];
            int length;
            while ((byteread = inStream.read(buffer)) != -1) {
                bytesum += byteread; // 字节数 文件大小
                System.out.println(bytesum);
                fs.write(buffer, 0, byteread);
            }
            inStream.close();
        }
    } catch (Exception e) {
        System.out.println("复制单个文件操作出错 ");
        e.printStackTrace();

    }

}

/**
 * 复制整个文件夹内容
 * 
 * @param oldPath
 *            String 原文件路径 如：c:/fqf
 * @param newPath
 *            String 复制后路径 如：f:/fqf/ff
 * @return boolean
 */
public void copyFolder(String oldPath, String newPath) {
    try {
        (new File(newPath)).mkdirs(); // 如果文件夹不存在 则建立新文件夹
        File a = new File(oldPath);
        String[] file = a.list();
        File temp = null;
        for (int i = 0; i < file.length; i++) {
            if (oldPath.endsWith(File.separator)) {
                temp = new File(oldPath + file[i]);
            } else {
                temp = new File(oldPath + File.separator + file[i]);
            }

            if (temp.isFile()) {
                FileInputStream input = new FileInputStream(temp);
                FileOutputStream output = new FileOutputStream(newPath
                        + "/" + (temp.getName()).toString());
                byte[] b = new byte[1024 * 5];
                int len;
                while ((len = input.read(b)) != -1) {
                    output.write(b, 0, len);
                }
                output.flush();
                output.close();
                input.close();
            }
            if (temp.isDirectory()) {// 如果是子文件夹
                copyFolder(oldPath + "/ " + file[i], newPath + "/ "
                        + file[i]);
            }
        }
    } catch (Exception e) {
        System.out.println("复制整个文件夹内容操作出错 ");
        e.printStackTrace();

    }

}

/**
 * 移动文件到指定目录
 * 
 * @param oldPath
 *            String 如：c:/fqf.txt
 * @param newPath
 *            String 如：d:/fqf.txt
 */
public void moveFile(String oldPath, String newPath) {
    copyFile(oldPath, newPath);
    delFile(oldPath);

}

/**
 * 移动文件到指定目录
 * 
 * @param oldPath
 *            String 如：c:/fqf.txt
 * @param newPath
 *            String 如：d:/fqf.txt
 */
public void moveFolder(String oldPath, String newPath) {
    copyFolder(oldPath, newPath);
    delFolder(oldPath);

}

public static void main(String[] args) {
}

}[/code]

java实现文件复制很容易
[code="java"]import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

/**

• CopyFile.java

• Created on Apr 17, 2009, 4:33:43 PM

• Copyright (c) 2007-2009. CUCKOO Workgroup, USTC, P.R.China

• @author Ren Jian */
  public class CopyFile {
  private boolean copy(String fileFrom, String fileTo) {
  try {
  FileInputStream in = new java.io.FileInputStream(fileFrom);
  FileOutputStream out = new FileOutputStream(fileTo);
  byte[] bt = new byte[1024];
  int count;
  while ((count = in.read(bt)) > 0) {
  out.write(bt, 0, count);
  }
  in.close();
  out.close();
  return true;
  } catch (IOException ex) {
  return false;
  }
  }
  } [/code]