package com.heima.www.test5;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.InputStream;
import java.io.OutputStream;
public class FileReadAndWriteDemo {
public  void fileDemo() {
  String regex="\\.java";
  try {
   File file = new File("d:");
   if (!(file.exists() && file.isDirectory()))
    try {
     throw new Exception("目录不存在");
    } catch (Exception e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   File[] files = file.listFiles(new FilenameFilter() {
    public boolean accept(File dir, String name) {
     return name.endsWith(".java");
    }
   });
   System.out.println(files.length);
   File destDir = new File("c:/jad");
   if (!destDir.exists())
    destDir.mkdir();
   for (File f : files) {
    FileInputStream fis = new FileInputStream(f);
//    String destFileName = f.getName().replaceAll("\\.java{1}quot;",
//      ".jad");
    String destFileName = f.getName().replaceAll(regex, ".jad");
    FileOutputStream fos = new FileOutputStream(new File(destDir,
      destFileName));
    copy(fis, fos);
    fis.close();
    fos.close();
   }
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
}
private static void copy(InputStream ips, OutputStream ops)
   throws Exception {
  int len = 0;
  byte[] buf = new byte[1024];
  while ((len = ips.read(buf)) != -1) {
   ops.write(buf, 0, len);
  }
}
}

package com.heima.www.test5;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.InputStream;
import java.io.OutputStream;
public class FileReadAndWriteDemo {
public  void fileDemo() {
  String regex="\\.java";
  try {
   File file = new File("d:");
   if (!(file.exists() && file.isDirectory()))
    try {
     throw new Exception("目录不存在");
    } catch (Exception e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   File[] files = file.listFiles(new FilenameFilter() {
    public boolean accept(File dir, String name) {
     return name.endsWith(".java");
    }
   });
   System.out.println(files.length);
   File destDir = new File("c:/jad");
   if (!destDir.exists())
    destDir.mkdir();
   for (File f : files) {
    FileInputStream fis = new FileInputStream(f);
//    String destFileName = f.getName().replaceAll("\\.java{1}quot;",
//      ".jad");
    String destFileName = f.getName().replaceAll(regex, ".jad");
    FileOutputStream fos = new FileOutputStream(new File(destDir,
      destFileName));
    copy(fis, fos);
    fis.close();
    fos.close();
   }
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
}
private static void copy(InputStream ips, OutputStream ops)
   throws Exception {
  int len = 0;
  byte[] buf = new byte[1024];
  while ((len = ips.read(buf)) != -1) {
   ops.write(buf, 0, len);
  }
}
}