javaweb下载文件

//读取文件->写出文件

public static void main(String[] args) {

 InputStream in =null;

 OutputStream out = null;

try{

File file = new File("c:\\123.doc");

in = new FileInputStream(file);

out = new FileOutputStream("c:\\666.doc");

 int len = 0;

 byte buffer[] = new byte[1024];

 while((len=in.read(buffer))>0){

 out.write(buffer, 0, len);

 }

}catch (Exception e) {

e.printStackTrace();

}finally{

try {

out.close();

in.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

 

 

 

 

//web文件下载

public void download() {

  InputStream in = null ;

  OutputStream out = null;

  try{

  in = new FileInputStream("c:\\123.doc");

  int len =0;

  byte[] buffer = new byte[1024];

  out = getResponse().getOutputStream();

  getResponse().setHeader("Content-Disposition", "attachment;filename=aaa.doc"); //告诉浏览器以什么方式打开文件

  while((len=in.read(buffer))>0){

  out.write(buffer, 0, len);

  }

  }catch (Exception e) {

  e.printStackTrace();

}

  }

 

 

//web文件下载（文件名称乱码解决）

public void download() {

  InputStream in = null ;

  OutputStream out = null;

  try{

  in = new FileInputStream("c:\\123.doc");

  int len =0;

  byte[] buffer = new byte[1024];

  out = getResponse().getOutputStream();      //将文件写出response的输出流

  getResponse().setContentType("text/html;charset=UTF-8");

  getResponse().setHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode("作业本.doc","UTF-8"));   //告诉浏览器以什么方式打开文件 和 文件名乱码解决

  while((len=in.read(buffer))>0){

  out.write(buffer, 0, len);

  }

  }catch (Exception e) {

  e.printStackTrace();

}

  }