从java下载web url下载图像？ [英] Download image from web url in java?

问题描述

URL url = new URL("http://localhost:8080/Work/images/abt.jpg");

InputStream in = new BufferedInputStream(url.openStream());
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
int n=0;
while (-1!=(n=in.read(buf)))
{
   out.write(buf, 0, n);
}
out.close();
in.close();
byte[] response1 = out.toByteArray();

FileOutputStream fos = new FileOutputStream("C://abt.jpg");
fos.write(response1);
fos.close();

此代码中最后3行有一些错误

in this code there is some error in last 3 lines

SEVERE：servlet的Servlet.service（）ImageDownloadServlet抛出了异常java.io. FileNotFoundException ：C：/abt.jpg（没有这样的文件或目录）

SEVERE: Servlet.service() for servlet ImageDownloadServlet threw exception java.io.FileNotFoundException: C:/abt.jpg (No such file or directory)

我该如何解决？

推荐答案

String filePath = request.getParameter("action");
        System.out.println(filePath);
        // URL url = new
        // URL("http://localhost:8080/Works/images/abt.jpg");
        response.setContentType("image/jpeg");
        response.setHeader("Content-Disposition", "attachment; filename=icon" + ".jpg");
        URL url = new URL(filePath);
        URLConnection connection = url.openConnection();
        InputStream stream = connection.getInputStream();

        BufferedOutputStream outs = new BufferedOutputStream(response.getOutputStream());
        int len;
        byte[] buf = new byte[1024];
        while ((len = stream.read(buf)) > 0) {
            outs.write(buf, 0, len);
        }
        outs.close();
    }

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