请问在struts中怎么上传文件?急啊!

但是,在struts里面也可以的,但我不知道Action里怎么样保存文件.

看struts的例子程序，有一个专门是上传的。

看看Struts自己带的文件上传的例子：
struts-upload.war

1.建立upload.jsp
%@ page language="java" %><%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>


<html:form action="upload.do" enctype="multipart/form-data"> Please enter some text, just to demonstrate the handling of text elements as opposed to file elements: 
<html:text property="theText" /> 

Please select the file that you would like to upload: 
<html:file property="theFile" /> If you would rather write this file to another file, please check here:
 <html:checkbox property="writeFile" /> If you checked the box to write to a file, please specify the file path here: 
 <html:text property="filePath" /> 

<html:submit />
</html:form>
2.建立UploadForm.javapackage org.apache.struts.webapp.upload;
import org.apache.struts.upload.FormFile;
import org.apache.struts.action.ActionForm;public class UploadForm extends ActionForm {
 /**
 * The value of the text the user has sent as form data
 */
 protected String theText; /**
 * Whether or not to write to a file
 */
 protected boolean writeFile; /**
 * The file that the user has uploaded
 */
 protected FormFile theFile; /**
 * The file path to write to
 */
 protected String filePath; /**
 * Retrieve the value of the text the user has sent as form data
 */
 public String getTheText() {
 return theText;
 } /**
 * Set the value of the form data text
 */
 public void setTheText(String theText) {
 this.theText = theText;
 } /**
 * Retrieve a representation of the file the user has uploaded
 */
 public FormFile getTheFile() {
 return theFile;
 } /**
 * Set a representation of the file the user has uploaded
 */
 public void setTheFile(FormFile theFile) {
 this.theFile = theFile;
 } /**
 * Set whether or not to write to a file
 */
 public void setWriteFile(boolean writeFile) {
 this.writeFile = writeFile;
 } /**
 * Get whether or not to write to a file
 */
 public boolean getWriteFile() {
 return writeFile;
 } /**
 * Set the path to write a file to
 */
 public void setFilePath(String filePath) {
 this.filePath = filePath;
 } /**
 * Get the path to write a file to
 */
 public String getFilePath() {
 return filePath;
 } public void reset() {
 writeFile = false;
 }
}

3.建立UploadAction.java
package org.apache.struts.webapp.upload;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.FileOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.struts.upload.FormFile;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ForwardingActionForward;
public class UploadAction extends Action { public ActionForward perform(ActionMapping mapping,
 ActionForm form,
 HttpServletRequest request,
 HttpServletResponse response) { if (form instanceof UploadForm) { UploadForm theForm = (UploadForm) form; //retrieve the text data
 String text = theForm.getTheText(); //retrieve the file representation
 FormFile file = theForm.getTheFile(); //retrieve the file name
 String fileName= file.getFileName(); //retrieve the content type
 String contentType = file.getContentType(); boolean writeFile = theForm.getWriteFile(); //retrieve the file size
 String size = (file.getFileSize() + " bytes"); String data = null; try {
 //retrieve the file data
 ByteArrayOutputStream baos = new ByteArrayOutputStream();
 InputStream stream = file.getInputStream();
 if (!writeFile) {
 //only write files out that are less than 1MB
 if (file.getFileSize() < (4*1024000)) { byte[] buffer = new byte[8192];
 int bytesRead = 0;
 while ((bytesRead = stream.read(buffer, 0, 8192)) != -1) {
 baos.write(buffer, 0, bytesRead);
 }
 data = new String(baos.toByteArray());
 }
 else {
 data = new String("The file is greater than 4MB, " +
 " and has not been written to stream." +
 " File Size: " + file.getFileSize() + " bytes. This is a" +
 " limitation of this particular web application, hard-coded" +
 " in org.apache.struts.webapp.upload.UploadAction");
 }
 }
 else {
 //write the file to the file specified
 OutputStream bos = new FileOutputStream(theForm.getFilePath());
 int bytesRead = 0;
 byte[] buffer = new byte[8192];
 while ((bytesRead = stream.read(buffer, 0, 8192)) != -1) {
 bos.write(buffer, 0, bytesRead);
 }
 bos.close();
 data = "The file has been written to \"" + theForm.getFilePath() + "\"";
 }
 //close the stream
 stream.close();
 }
 catch (FileNotFoundException fnfe) {
 return null;
 }
 catch (IOException ioe) {
 return null;
 } //place the data into the request for retrieval from display.jsp
 request.setAttribute("text", text);
 request.setAttribute("fileName", fileName);
 request.setAttribute("contentType", contentType);
 request.setAttribute("size", size);
 request.setAttribute("data", data); //destroy the temporary file created
 file.destroy(); //return a forward to display.jsp
 return mapping.findForward("display");
 } //this shouldn't happen in this example
 return null;
 }
}
4.建立display.jsp
<%@ page language="java" %>The Text: <%= request.getAttribute("text") %> The File name: <%= request.getAttribute("fileName") %> The File content type: <%= request.getAttribute("contentType") %> The File size: <%= request.getAttribute("size") %> The File data: <hr />
<pre><%= request.getAttribute("data") %></pre>
<hr />应用时自己灵活改变

有没有用commons-fileupload组件,上传文件的例子啊?

to HITZXL(编程要厚道) omg，我的代码和你一模一样，但是传给action的form是null，哭啊！谁知道是怎么回事啊！是不是struts的版本问题啊！多谢，多多谢！

在form里注明form的type，呵呵，不要急，慢慢来

注意细节，
<html:form action="upload.do" enctype="multipart/form-data">
-----------------------------
但是如果真的一模一样，我就不知道原因了
还有就是在tomcat4.1下，好用，至于5.0似乎有些问题

struts的上传文件正确,我使用过的,没问题，你自己看清楚的程序吧

看看Struts自己带的文件上传的例子：
struts-upload.war
上传的目录可以在struts-config.xml里设置

调试易

请问在struts中怎么上传文件?急啊!

解决方案 »