java 通过url下载文件到浏览器
前端传来url地址与文件名,下载文件到浏览器
- 代码 (这里模拟,直接在代码里写了url,可以拼接在url后进行截取)
请求接口
@GetMapping("/findOperatorBarVO2")
@ApiOperation(value = "下载")
public void findOperatorCharBar2(HttpServletResponse response)throws IOException{
toDownload(response);
}
下载方法
public static void toDownload( HttpServletResponse response) {
ServletOutputStream out = null;
InputStream inputStream = null;
try {
//路径
String path = "http://10.202.61.66:11111/KEDFSFile/M00/00/1E/Cso9Ql7Z61CAZtQcAAAGqKgzHds335.txt";
// 取得文件的后缀名。
String ext = path.substring(path.lastIndexOf(".") + 1).toLowerCase();
//文件名
String pdfName = "问题."+ext;
// 获取外部文件流
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(3 * 1000);
//防止屏蔽程序抓取而返回403错误
conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
inputStream = conn.getInputStream();
/** * 输出文件到浏览器 */
int len = 0;
// 输出 下载的响应头,如果下载的文件是中文名,文件名需要经过url编码
response.setContentType("application/x-download");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(pdfName, "UTF-8"));
response.setHeader("Cache-Control", "no-cache");
out = response.getOutputStream();
byte[] buffer = new byte[1024];
while ((len = inputStream.read(buffer)) > 0) {
out.write(buffer, 0, len);
}
out.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (Exception e) {
}
}
if (out != null) {
try {
out.close();
} catch (Exception e) {
}
}
}
}
前端代码
window.location.href = "http://localhost:9090/xx/evaOperator/findOperatorBarVO2";
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