1,上傳頁面，upload.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
上傳頁面
</head>
<body>
<s:actionerror/>
<form action="${pageContext.request.contextPath}/upload" method="post" enctype="multipart/form-data">
<input type="file" name="upload"><br>
<input type="file" name="upload"><br>
<input type="file" name="upload"><br>
<input type="submit" value="上傳">
</form>
</body>
</html>
2,配置文件 struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.multipart.maxSize" value="20971520"></constant>
<package name="default" namespace="/" extends="struts-default">
<action name="upload" class="upload.UploadAction" > </action>
</package>
</struts>
3,acton文件
package upload;
import java.io.File;
import java.util.List;
import org.apache.commons.io.FileUtils;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
// 在action類中需要聲明三個屬性
private List<File> upload;
private List<String> uploadFileName;
private List<String> uploadContentType;
public List<File> getUpload() {
return upload;
}
public void setUpload(List<File> upload) {
this.upload = upload;
}
public List<String> getUploadFileName() {
return uploadFileName;
}
public void setUploadFileName(List<String> uploadFileName) {
this.uploadFileName = uploadFileName;
}
public List<String> getUploadContentType() {
return uploadContentType;
}
public void setUploadContentType(List<String> uploadContentType) {
this.uploadContentType = uploadContentType;
}
@Override
public String execute() throws Exception {
for(int i=0;i<upload.size();i++){
System.out.println("上傳文件的名稱:" + uploadFileName.get(i));
// 完成文件上傳.
FileUtils.copyFile(upload.get(i), new File("d:/upload", uploadFileName.get(i)));
}
return null;
}
}
注意點；
一，默認的文件上傳大小有顯示，要在struts.xml中聲明一個常量，這個常量的默認值是2097152，
二，action類中的File類型的對象必須和頁面上的file的name保持一致