java WEB项目通过url下载图片到本地

最新推荐文章于 2024-04-26 20:10:19 发布

原创最新推荐文章于 2024-04-26 20:10:19 发布 · 1.7k 阅读

5 ·

CC 4.0 BY-SA版权

文章标签：

#java #download #path

本文介绍了一个简单的图片下载接口实现方式，通过HTTP请求获取指定URL的图片，并将其作为附件形式返回给客户端。文章详细展示了如何使用Java处理HTTP请求，设置响应头以支持不同浏览器的兼容性，并确保文件正确下载。

@RequestMapping(value="/downloadImg")
	public void downloadImg(HttpServletResponse response,HttpServletRequest request) throws Exception{
		BufferedInputStream dis = null;
		BufferedOutputStream fos = null;
		
		String urlString = request.getParameter("urlString");
		String fileName = urlString.substring(urlString.lastIndexOf('/') + 1);
		
	    try {
			
	    	URL url = new URL(urlString);
	    	response.setContentType("application/x-msdownload;");  
	        response.setHeader("Content-disposition", "attachment; filename=" + new String(fileName.getBytes("utf-8"), "ISO8859-1"));  
	        response.setHeader("Content-Length", String.valueOf(url.openConnection().getContentLength()));  
	        
	        dis = new BufferedInputStream(url.openStream());
			fos = new BufferedOutputStream(response.getOutputStream());  
			
			byte[] buff = new byte[2048];  
            int bytesRead;  
            while (-1 != (bytesRead = dis.read(buff, 0, buff.length))) {  
            	fos.write(buff, 0, bytesRead);  
            }  
			
		} catch (Exception e) {
			e.printStackTrace();
		} finally { 
			
			if (dis != null)  
				dis.close();  
            if (fos != null)  
            	fos.close();  
            
		}
		
	}