Java实现文件或文件夹的复制到指定目录实例

整理文档，搜刮出一个java实现文件或文件夹的复制到指定目录的代码，稍微整理精简一下做下分享。

import java.io.file; 
import java.io.fileinputstream; 
import java.io.fileoutputstream; 
 
public class test { 
  private static int a = 5; 
 
  public static void main(string[] args) { 
    //需要复制的目标文件或目标文件夹 
    string pathname = "c:/users/likun/desktop/git_project"; 
    file file = new file(pathname); 
    //复制到的位置 
    string topathname = "c:/users/likun/desktop/movie"; 
    file tofile = new file(topathname); 
    try { 
      copy(file, tofile); 
    } catch (exception e) { 
      // todo auto-generated catch block 
      e.printstacktrace(); 
    } 
  } 
 
  public static void copy(file file, file tofile) throws exception { 
    byte[] b = new byte[1024]; 
    int a; 
    fileinputstream fis; 
    fileoutputstream fos; 
    if (file.isdirectory()) { 
      string filepath = file.getabsolutepath(); 
      filepath=filepath.replaceall("\\\\", "/"); 
      string tofilepath = tofile.getabsolutepath(); 
      tofilepath=tofilepath.replaceall("\\\\", "/"); 
      int lastindexof = filepath.lastindexof("/"); 
      tofilepath = tofilepath + filepath.substring(lastindexof ,filepath.length()); 
      file copy=new file(tofilepath); 
      //复制文件夹 
      if (!copy.exists()) { 
        copy.mkdir(); 
      } 
      //遍历文件夹 
      for (file f : file.listfiles()) { 
        copy(f, copy); 
      } 
    } else { 
      if (tofile.isdirectory()) { 
        string filepath = file.getabsolutepath(); 
        filepath=filepath.replaceall("\\\\", "/"); 
        string tofilepath = tofile.getabsolutepath(); 
        tofilepath=tofilepath.replaceall("\\\\", "/"); 
        int lastindexof = filepath.lastindexof("/"); 
        tofilepath = tofilepath + filepath.substring(lastindexof ,filepath.length()); 
         
        //写文件 
        file newfile = new file(tofilepath); 
        fis = new fileinputstream(file); 
        fos = new fileoutputstream(newfile); 
        while ((a = fis.read(b)) != -1) { 
          fos.write(b, 0, a); 
        } 
      } else { 
        //写文件 
        fis = new fileinputstream(file); 
        fos = new fileoutputstream(tofile); 
        while ((a = fis.read(b)) != -1) { 
          fos.write(b, 0, a); 
        } 
      } 
 
    } 
  } 
 
} 

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