Java文件 *** 作里面的文件复制问题

Java编程文件 *** 作，将一个文件的内容复制到另一个文件中，案例代码如下：

package example;
import javaioFile;
import javaioFileInputStream;
import javaioFileNotFoundException;
import javaioFileOutputStream;
import javaioIOException;
import javaioInputStream;
import javaioOutputStream;
 
/
  将一个文件的内容复制到另一个文件中 要采边读边写的模式，这样效率才会高
  
  @author Administrator
 
 /
public class Copy {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Systemoutprintln(argslength);
        /
          在args参数中传进两个文件的路径,可以在run as->run configuration的arguments设置args的参数
         
         /
        if (argslength != 2) {
            Systemoutprintln("输入的参数不正确!");
            Systemexit(1);
        }
        File file1 = new File(args[0]);
        File file2 = new File(args[1]);
 
        if (!file1exists()) {
            Systemoutprintln("源文件不存在!");
 
        }
        InputStream fileInputStream = null;
        try {
            fileInputStream = new FileInputStream(file1);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            eprintStackTrace();
        }
        OutputStream fileOutputStream = null;
        try {
            fileOutputStream = new FileOutputStream(file2, true);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            eprintStackTrace();
        }
 
        if (fileInputStream != null && fileOutputStream != null) {
            int temp = 0;
            try {
                /
                  边读边写
                 /
                while ((temp = fileInputStreamread()) != -1) {
                    fileOutputStreamwrite(temp);
                }
                Systemoutprintln("复制完成");
            } catch (IOException e) {
                // TODO Auto-generated catch block
                eprintStackTrace();
                Systemoutprintln("复制失败");
            } finally {
                try {
                    fileInputStreamclose();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    eprintStackTrace();
                }
                try {
                    fileOutputStreamclose();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    eprintStackTrace();
                }
            }
 
        }
 
    }
 
}

借助工具包commons-iojar
import javaioFile;
import javaioIOException;
import orgapachecommonsioFileUtils;
public class Admin {
public static void main(String[] args) {
File from = new File("d:/a");
File to = new File("d:/b");
try {
FileUtilscopyDirectory(from, to);
} catch (IOException e) {
eprintStackTrace();
}
}
}

---