jsp中response实现图片下载

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

String path = this.getServletContext().getRealPath("/download/中国.png");

String filename=path.substring(path.indexOf("\\")+1);

response.setHeader("content-disposition", "attachment;filename="+RUL(filename,“UTF-8”));

FileInputStream in=null;

ServletOutputStream out=null;

try{

in=new FileInputStream(path);

int len=0;

byte buffer[]=new byte[1024];

out=response.getOutputStream();

while((len=in.read(buffer))>0){

out.write(buffer,0,len);

}

}finally{

if(in!=null){

try{

in.close();

}catch(IOException e){

e.printStackTrace();

}

}

}

}