用Struts实现文件上传

Struts的文件上传

本文用的是Struts1.1的org.apache.struts.upload.FormFile类。很方便，不用自己写。也不用写一个jsp调用jspsmartupload就可以搞定。



选择上传文件页面：selfile.jsp

---

<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>

<html:html>

<html:form action="/uploadsAction.do" enctype="multipart/form-data">

<html:file property="theFile"/>

<html:submit/>

</html:form>

</html:html>

---

UpLoadAction.java

---

import java.io.*;

import javax.servlet.http.*;

import org.apache.struts.action.*;

import org.apache.struts.upload.FormFile;

 

/**

* <p>Title:UpLoadAction</p>

* <p>Description: QRRSMMS </p>

* <p>Copyright: Copyright (c) 2004 jiahansoft</p>

* <p>Company: jiahansoft</p>

* @author wanghw

* @version 1.0

*/



public class UpLoadAction extends Action {

public ActionForward execute(ActionMapping mapping,

ActionForm form,

HttpServletRequest request,

HttpServletResponse response)

throws Exception {

if (form instanceof uploadsForm) {//如果form是uploadsForm

String encoding = request.getCharacterEncoding();

if ((encoding != null) && (encoding.equalsIgnoreCase("utf-8")))

{

response.setContentType("text/html; charset=gb2312");//如果没有指定编码，编码格式为gb2312

}

UpLoadForm theForm = (UpLoadForm ) form;

FormFile file = theForm.getTheFile();//取得上传的文件

try {

InputStream stream = file.getInputStream();//把文件读入

String filePath = request.getRealPath("/");//取当前系统路径

ByteArrayOutputStream baos = new ByteArrayOutputStream();

OutputStream bos = new FileOutputStream(filePath + "/" +

file.getFileName());//建立一个上传文件的输出流

//System.out.println(filePath+"/"+file.getFileName());

int bytesRead = 0;

byte[] buffer = new byte[8192];

while ( (bytesRead = stream.read(buffer, 0, 8192)) != -1) {

bos.write(buffer, 0, bytesRead);//将文件写入服务器

}

bos.close();

stream.close();

}catch(Exception e){

System.err.print(e);

}

//request.setAttribute("dat",file.getFileName());

return mapping.findForward("display");

}

return null;

}

}

---

UpLoadForm.java

---

 

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.*;

import org.apache.struts.upload.*;



/**

* <p>Title:UpLoadForm</p>

* <p>Description: QRRSMMS </p>

* <p>Copyright: Copyright (c) 2004 jiahansoft</p>

* <p>Company: jiahansoft</p>

* @author wanghw

* @version 1.0

*/

public class UpLoadForm extends ActionForm {

public static final String ERROR_PROPERTY_MAX_LENGTH_EXCEEDED = "org.apache.struts.webapp.upload.MaxLengthExceeded";

protected FormFile theFile;

public FormFile getTheFile() {

return theFile;

}

public void setTheFile(FormFile theFile) {

this.theFile = theFile;

}

public ActionErrors validate(ActionMapping mapping, HttpServletRequest request)

{

ActionErrors errors = null;

//has the maximum length been exceeded?

Boolean maxLengthExceeded = (Boolean)

request.getAttribute(MultipartRequestHandler.ATTRIBUTE_MAX_LENGTH_EXCEEDED);

if ((maxLengthExceeded != null) && (maxLengthExceeded.booleanValue()))

{

errors = new ActionErrors();

errors.add(ERROR_PROPERTY_MAX_LENGTH_EXCEEDED, new ActionError("maxLengthExceeded"));

}

return errors;

}

}

//这是相对应的form，还有其他属性可以设置，具体可以参考struts的上传例子。

---

struts-config.xml

---

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">

<struts-config>

<form-beans>

<form-bean name="uploadsForm" type="UpLoadForm" />

</form-beans>

<action-mappings>

<action name="uploadsForm" type="UpLoadAction" path="/uploadsAction">

<forward name="display" path="/display.jsp" />

</action>

</action-mappings>

</struts-config>

<!--display.jsp就是随便写一个成功页-->