一、Struts2文件上传：
二、配置文件的大小以及允许上传的文件类型：
三、大文件上传：
如果不配置上传文件的大小，struts2默认允许上传文件最大为2M； 2097152Byte；
例子实现：
com.cy.action.FileUploadAction.java:
package com.cy.action;
import java.io.File;
import org.apache.commons.io.FileUtils;
import com.opensymphony.xwork2.ActionSupport;
public class FileUploadAction extends ActionSupport{
private static final long serialVersionUID = 1L;
private File struts; //文件，对应fileupload.jsp中input type=file的name
private String strutsFileName; //文件名
private String strutsContentType; //文件类型
public File getStruts() {
return struts;
}
public void setStruts(File struts) {
this.struts = struts;
}
public String getStrutsFileName() {
return strutsFileName;
}
public void setStrutsFileName(String strutsFileName) {
this.strutsFileName = strutsFileName;
}
public String getStrutsContentType() {
return strutsContentType;
}
public void setStrutsContentType(String strutsContentType) {
this.strutsContentType = strutsContentType;
}
@Override
public String execute() throws Exception {
System.out.println("文件名：" + strutsFileName);
System.out.println("文件类型：" + strutsContentType);
String filePath = "E:/" + strutsFileName;
File savefile = new File(filePath);
FileUtils.copyFile(struts, savefile);
return SUCCESS;
}
}
struts.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <!-- 配置允许上传文件最大为20000000Byte,约20Mb -->
<constant name="struts.multipart.maxSize" value="20000000"></constant> <package name="manage" extends="struts-default">
<action name="upload" class="com.cy.action.FileUploadAction">
<result name="input">fileupload.jsp</result>
<result name="success">success.jsp</result> <!-- 配置允许上传的文件类型
配置允许上传的文件大小，最大81101byte，= 79.2KB
-->
<interceptor-ref name="fileUpload">
<param name="allowedTypes">image/bmp,image/x-png,image/gif,image/jpg,image/jpeg</param>
<param name="maximumSize">81101</param>
</interceptor-ref> <interceptor-ref name="defaultStack"></interceptor-ref>
</action> </package> </struts>
fileupload.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<!-- 显示文件上传错误时，返回的失败信息 -->
<s:fielderror></s:fielderror>
<form action="upload" method="post" enctype="multipart/form-data">
选择文件：<input type="file" name="struts" /><br/>
<input type="submit" value="提交" />
</form>
</body>
</html>
success.jsp:
<body>
文件上传成功！
</body>
测试结果：
1）配置允许上传的文件类型，和文件大小；
2）配置大文件上传，上面例子中配置了20M左右；
如果不配置大文件上传，上传大于2M的会报错：
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