Java从服务器端下载文件保存到本地，不是下载的图片？

public static void downloadFile(String urlPath, String filePath) throws IOException {
        URL url = new URL(urlPath);
        String name = urlPath.substring(urlPath.lastIndexOf("=")+1);
        String filePaths = filePath+"/"+name;
        File dirFile = new File(filePath);
        if (!dirFile.exists()) {
            dirFile.mkdir();
        }
        URLConnection connection = url.openConnection();
        InputStream in = connection.getInputStream();
        FileOutputStream os = new FileOutputStream(filePaths);
        byte[] buffer = new byte[4 * 1024];
        int read;
        while ((read = in.read(buffer)) > 0) {
            os.write(buffer, 0, read);
        }
        os.close();
        in.close();
    }

    public static void main(String[] args) {
        String urlPath = "http://10.192.32.111:80/production-jcw/getDownload.do?fileName=49e23d3a-5e11-432d-9f33-91c93130b37b.dwg";
        String filePath = "C:/Users/MrLi/Desktop/";
        try {
            downloadFile(urlPath, filePath);
            System.out.println("下载成功");
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("下载失败");
        }
    }

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你参照下面这个改改就行了，希望能帮到你。

String fileName=imagesdata.substring(imagesdata.lastIndexOf("/")+1,imagesdata.length()); 
response.setHeader("Content-Disposition", "attachment; filename="+fileName);    response.addHeader("Content-Length", "");     
response.setContentType("image/jpeg");   
URL url = new URL(imagesdata);
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
DataInputStream in = new DataInputStream(connection.getInputStream());
DataOutputStream out = new DataOutputStream(response.getOutputStream());
                        byte[] buffer = new byte[4096];
                        int count = 0;
                        while ((count = in.read(buffer)) > 0)
                        {
                            out.write(buffer, 0, count);
                        }
                        out.close();
                        out.flush();
                        in.close();
                        connection.disconnect();