java 的在线下载文件 .pdf

java  的在线下载文件  .pdf

1.下载资源的本地位置

2.设置响应头

3.下载代码

1 PeriodicalResource periodicalResource = periodicalResourceService.get(id);
String filePath = periodicalResource.getAttachment();//获取资源位置
File file = new File(periodicalBaseDir + filePath);//本地资源位置
if (file.exists()) {
response.setContentType("application/force-download");// 设置强制下载不打开
response.addHeader("Content-Disposition",
"attachment;fileName=" + filePath.split("/")[filePath.split("/").length-1]);// 设置文件名
byte[] buffer = new byte[1024];
FileInputStream fis = null;
BufferedInputStream bis = null;
try {
fis = new FileInputStream(file);
bis = new BufferedInputStream(fis);
OutputStream os = response.getOutputStream();
int i = bis.read(buffer);
while (i != -1) {
os.write(buffer, 0, i);
i = bis.read(buffer);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (bis != null) {
try {
bis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}