通过servlet下载图片
下载页面:
<!DOCTYPE html> <html> <head> <meta charset = "utf-8"> <title>下载页面</title> </head> <body> <a href ="Download">下载图片</a> </body> </html>
java servlet code :
@WebServlet("/Download")
public class DownloadServlet extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IoException{
//获得绝对路径
String path = getServletContext().getRealPath("/");
//创建下载文件的file对象
File file = new File(path + "/img/img.png");
//读文件
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
//响应格式
resp.setHeader("content-disposition","attachment;filename=" + (new String(file.getName().getBytes(),"iso-8895-1")));
//把文件写到响应输出流
BufferedOutputStream bos = new BufferedOutputStream(resp.getOutputStream());
byte[] buff = new byte[1000];
int length;
while((length = bis.read(buff)) !=1){
bos.writer(buff,0,length);
bos.flush();
}
bis.close();
bos.close();
}
@Override
protected void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
doGet(req,resp);
}
}
代码中有些类可能是因为包没有导入,会出现一些错误............so,请自行导入............
可能会出现单词错误,毕竟我是手写进去的......................

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