java 上传文件(简单例子)

jsp页面：

<%-- 有附件的话:要设置enctype属性;??--%>
<html:form action="submitPublishReply.do" method="POST" onsubmit="return check();"? enctype="multipart/form-data">

???? 附件：<input type="file" name="attach" />
??? <input type="submit" value="回 复" />
? </ul>
</html:form>

?

?ActionForm:

private FormFile file;

?

Action：

import org.apache.commons.fileupload.*;
import org.apache.commons.fileupload.disk.*;
import org.apache.commons.fileupload.servlet.*;
import java.io.PrintWriter;
import java.io.File;
import org.apache.struts.upload.FormFile;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.FileOutputStream;
??????????? //附件
??????????? FormFile file = (FormFile) replyForm.getFile();
??????????? if (file != null && file.getFileName().trim().length() > 0) {
??????????????? String fileName = file.getFileName();
??????????????? byte[] b = file.getFileData();
??????????????? String dir = request.getRealPath("/uploadfile"); //request.getRealPath获得web应用程序在服务器的绝对路径
??????????????? OutputStream streamOut = new FileOutputStream(dir + "/" +
??????????????????????? fileName);
??????????????? streamOut.write(b, 0, b.length);
??????????? }