http --下载

private void disposition(HttpServletResponse response) throws IOException {
//下载

//通知浏览器进行下载
response.setHeader("content-disposition", "attachment;filename=22.jpg");

//资源 1.jpg
InputStream is = this.getServletContext().getResourceAsStream("1.jpg");
OutputStream out = response.getOutputStream();
byte[] buf = new byte[1024];
int len = -1;
while( (len = is.read(buf)) > -1 ){
out.write(buf, 0, len);
}
out.close();
is.close();

}

浏览器支持的格式，显示

//资源 1.jpg
InputStream is = this.getServletContext().getResourceAsStream("1.jpg");
OutputStream out = response.getOutputStream();
byte[] buf = new byte[1024];
int len = -1;
while( (len = is.read(buf)) > -1 ){
out.write(buf, 0, len);
}
out.close();
is.close();