jsp文件下载相关代码

function mydownload(filename, downloadlocation){
var downloadform = document.createElement("FORM");
document.body.appendChild(downloadform);
downloadform.method = "post";
createNewFormElement(downloadform, "filename", filename);
createNewFormElement(downloadform, "downloadlocation", downloadlocation);
downloadform.action = "<%=base %>/downloadAction.do";
downloadform.target = "_self";
downloadform.submit();
}

function createNewFormElement(inputForm, elementName, elementValue)
{
var newElement = document.createElement("input");
newElement.setAttribute("name",elementName);
newElement.setAttribute("type","hidden");
newElement.setAttribute("value",elementValue);
inputForm.appendChild(newElement);
return newElement;
}

FileInputStream fis = null;
OutputStream ops = null;

try {
fis = new FileInputStream(downloadlocation);

reponse.reset();
reponse.setContentType("application/x-download");
reponse.setHeader("Content-Disposition", "attachment;filename=" + filename);

ops = reponse.getOutputStream();

byte[] buffer = new byte[1024];
int count = 0;

while((count = fis.read(buffer)) > 0){
ops.write(buffer, 0, count);
}

ops.flush();

} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
if(fis != null){
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}

if(ops != null){
try {
ops.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}