文件下载

最新推荐文章于 2024-05-11 09:33:16 发布

tyjlearning

最新推荐文章于 2024-05-11 09:33:16 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/tyjlearning/article/details/78405965

本文介绍了一种使用Java在Web环境中实现文件下载的方法。通过解析HTTP请求参数获取文件名，并从指定路径读取文件内容，然后设置响应头来触发浏览器的下载行为。支持文件名的编码转换，并区分了在线查看与直接下载的不同设置。

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//下载
public void downFile() throws IOException{
String fileName = request.getParameter("fileName");
fileName = URLDecoder.decode(fileName, "UTF-8");
response.setCharacterEncoding("UTF-8");
boolean isOnLine = false;
Properties commonPro = new Properties();
String path = "config/common.properties";
InputStream is = AndroidVersionMainupdateAction.class.getClassLoader().getResourceAsStream(path);
commonPro.load(is);
String pt = commonPro.getProperty("filePath");
String filePath =pt+"\\"+fileName;
System.out.println("filePath"+filePath);
File f = new File(filePath);
if (!f.exists()) {
response.sendError(404, "File not found!");
return;
}
BufferedInputStream br = new BufferedInputStream(new FileInputStream(f));
byte[] buf = new byte[1024];
int len = 0;
response.reset(); //非常重要
if(isOnLine){ //在线打开方式
URL u = new URL("file:///"+filePath);
response.setContentType(u.openConnection().getContentType());
response.setHeader("Content-Disposition", "inline; filename="+(f.getName()).getBytes("gbk"));
//文件名应该编码成UTF-8
}
else{ //纯下载方式
response.setContentType("application/x-msdownload");
response.setHeader("Content-Disposition", "attachment; filename=" + java.net.URLEncoder.encode(f.getName(),"UTF-8"));
}
OutputStream out = response.getOutputStream();
while ((len = br.read(buf)) > 0) out.write(buf, 0, len);
br.close();
out.close();
}