Question

如何用jsp把客户端的文件上传到服务器什么去？？？？把文件保存在服务器什么的一个指定目录下面

Answer 1

String path = getServletContext().getRealPath("/");

try {
BufferedInputStream bis = new BufferedInputStream(request.getInputStream());
//创建临时文件
RandomAccessFile raf = new RandomAccessFile(path + "image//temp.jpg", "rw");

byte b[] = new byte[1000];
int n;
while ((n = bis.read(b)) != -1) {
raf.write(b, 0, n);
}
bis.close();
raf.seek(0);
for (int i = 0; i < 4; i++) {
raf.readLine();
}
long begin = raf.getFilePointer();

long m = raf.length() - 1;
raf.seek(m);

for (int i = 0; m >= 0 && (n = raf.readByte()) != -1 && i < 2;) {
if (n == '\n') {
i++;
}
raf.seek(m = raf.getFilePointer() - 2);
}
long end = raf.getFilePointer();

RandomAccessFile raf2 = new RandomAccessFile(path + "image//" + id + ".jpg", "rw");
raf.seek(begin);
for (long i = begin; i < end; i++) {
raf2.write(raf.readByte());
}
raf.close();
raf2.close();

//删除临时文件
File temp=new File(path+"image//temp.jpg");
temp.delete();

session.removeAttribute("photo");
out.print("<script>alert('更新成功');");//仍需刷新
out.print("window.location='Admin_view_book.jsp?id=" + id + "';</script>");
} catch (Exception e) {
e.printStackTrace();
out.print("<script>alert('出现错误');history.back();</script>");
}

Answer 2

楼主最好看下 JSP上传文件的相关代码和文章！
http://www.jspcn.net/htmlnews/B20070807101558.html
最好看下这里面的内容！！！

Answer 3

用session比较常见！
jsp端的代码写到<%%>中！