fileLoad.jsp
代码如下：
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ page contentType="text/html; charset=GBK" %>
<html:html>
<head>
<title>
fileLoad.jsp
</title>
</head>
<body>
<h1>JBuilder Generated Struts JSP for ActionForm forms.LoadForm</h1>
<p>
<html:form action="/loadAction.do" method="POST" enctype="multipart/form-data">
<html:file property="file"/><br />//对应于ActionFrom的FormFile file属性。
<html:submit property="submit" value="Submit"/>
<html:reset value ="Reset"/>
</html:form>
<p>
<logic:notEmpty name="loadForm" property="fname">
name:<bean:write name="loadForm" property="fname"/>
size:<bean:write name="loadForm" property="size"/>
</logic:notEmpty>
</p>
</body>
</html:html>
LoadForm的代码：
package forms;
import org.apache.struts.action.ActionForm;
import org.apache.struts.upload.FormFile;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMapping;
import javax.servlet.http.HttpServletRequest;
public class LoadForm extends ActionForm {
private FormFile file;
private String fname;
private String size;
public FormFile getFile() {
return file;
}
public void setFile(FormFile file) {
this.file = file;
}
public void setSize(String size) {
this.size = size;
}
public void setFname(String fname) {
this.fname = fname;
}
public String getFname() {
return fname;
}
public String getSize() {
return size;
}
public ActionErrors validate(ActionMapping actionMapping,
HttpServletRequest httpServletRequest) {
/** @todo: finish this method, this is just the skeleton.*/
return null;
}
public void reset(ActionMapping actionMapping,
HttpServletRequest servletRequest) {
}
}
LoginAction代码如下：
package actions;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForward;
import forms.LoadForm;
import org.apache.struts.action.Action;
import org.apache.struts.upload.FormFile;
import java.io.*;
public class LoadAction extends Action {
public ActionForward execute(ActionMapping actionMapping,
ActionForm actionForm,
HttpServletRequest servletRequest,
HttpServletResponse servletResponse)throws Exception {
LoadForm loadForm = (LoadForm) actionForm;
FormFile ff=loadForm.getFile();
if(ff==null)
{
return actionMapping.findForward("success");
}
String fname=ff.getFileName();
String size=Integer.toString(ff.getFileSize())+"bytes";
InputStream in=ff.getInputStream();
OutputStream out=new FileOutputStream("/"+fname);//"/"表示保存的路径可以修改为"load/"
int bytesRead=0;
byte[] buffer=new byte[8192];
while((bytesRead=in.read(buffer,0,8192))!=-1)
{
out.write(buffer,0,bytesRead);
}
out.close();
in.close();
loadForm.setFname(fname);
loadForm.setSize(size);
ff.destroy();
return actionMapping.findForward("success");
}
}
struts-config.xml代码：
<?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="loadForm" type="forms.LoadForm" />
</form-beans>
<action-mappings>
<action name="loadForm" path="/loadAction" scope="request" type="actions.LoadAction" input="/fileLoad.jsp">
<forward name="success" path="/fileLoad.jsp">
</forward>
</action> </action-mappings>
</struts-config>
说明：<html:file>标签可以方便的实现文件上传功能。
有以下几点需要注意：
1: <html:file>必须嵌套在<html:form>标签中。
2:<html:form>标签的method的属性必须设为"post".
3:<html:form>标签的编码类型enctype属性必须为"multipart/form-data"。
4：<html:file>标签必须设为property属性，这个属性和ActionForm Bean中FormFile类型的属性对应。
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