struts2文件上传

1.创建项目，添加struts2的支持，然后：

代码：FileUpload类完成文件上传：

package com.myphome;


import java.io.File;
import java.util.UUID;


import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;


import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;


/**
 * struts2文件上传处理类
 * */
public class FileUpload {

private File upload;//保存上传的文件,必须和页面上传“type="file""的name相同
private String uploadFileName;//保存上传的文件名称，必须为“name”+FileName
private String uploadContentType;//保存上传的文件类型，必须为“name”+ContentType

//提供属性的set、get方法
public File getUpload() {
return upload;
}
public void setUpload(File upload) {
this.upload = upload;
}


public String getUploadFileName() {
return uploadFileName;
}
public void setUploadFileName(String uploadFileName) {
this.uploadFileName = uploadFileName;
}
public String getUploadContentType() {
return uploadContentType;
}
public void setUploadContentType(String uploadContentType) {
this.uploadContentType = uploadContentType;
}
public String uploadFile() throws Exception{
//获取文件上传的类型，实现文件类型安全验证
if(!(uploadContentType.equalsIgnoreCase("image/pjpeg")||uploadContentType.equalsIgnoreCase("image/gif")||uploadContentType.equalsIgnoreCase("image/x-png"))){
ActionContext.getContext().put("message", "文件格式不正确");
return Action.SUCCESS;
}
System.out.println(uploadContentType);
if(upload!=null){
//上传文件在服务器上的保存位置
String strfolder=ServletActionContext.getServletContext().getRealPath("/images");
System.out.println(strfolder);
File folder=new File(strfolder);
if(folder.exists()==false){
folder.mkdir();
}
//更换上传文件名
String ext=uploadFileName.substring(uploadFileName.lastIndexOf("."));
String newFileName=UUID.randomUUID().toString()+ext;
System.out.println(newFileName);
//设置目标对象
File dest=new File(folder, newFileName);
//把临时文件拷贝到目标文件
FileUtils.copyFile(upload, dest);
//设置视图提示内容
ActionContext.getContext().put("message", "文件上传成功");
}
return Action.SUCCESS;
}
}

struts.xml配置：

?xml version="1.0" encoding="UTF-8" ?
!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"
struts
!-- 此属性规定了struts2文件上传的内容允许 的最大字节数 --
constant name="struts.multipart.maxSize" value="2097152" /constant
package name="load"  namespace="/struts" extends="struts-default"
action name="upload" method="uploadFile"
result name="success" type="dispatcher" /index.jsp /result
/action
/package
/struts    

界面：

%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%
%@ taglib uri="/struts-tags" prefix="s"%
%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%


!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
  head
    base href=" %=basePath% "
    
    title struts2文件上传 /title
meta http-equiv="pragma" content="no-cache"
meta http-equiv="cache-control" content="no-cache"
meta http-equiv="expires" content="0"    
meta http-equiv="keywords" content="keyword1,keyword2,keyword3"
meta http-equiv="description" content="This is my page"
!--
link rel="stylesheet" type="text/css" href="styles.css"
--
  /head
  body
  s:if test="%{message==null}"
span 文件格式必须为图片，大小不大于2G /span
  /s:if
  s:if test="%{message!=null}"
  ${message}
  /s:if
    form action="${pageContext.request.contextPath}/struts/upload" method="post" enctype="multipart/form-data" name="formup" id="formup"
    上传文件： input type="file" name="upload" id="upload"
    input type="submit" name="submit" value="确认上传"
    /form
  /body
/html

struts2的文件上传 在做B/S系统时，通常会涉及到上传文件和下载文件，在没接struts2框架之前，我们都是使用apache下面的commons子项目的FileUpload组件来进行文件的上传，但是那样做的话，代码看起来比较繁琐，而且不灵活，在学习了struts2后，struts2为文件上传下载提供了更好的实现机制，在...
Struts2文件上传 1  在Struts2中上传文件需要 commons-fileupload-1.2.1.jar、commons-io-1.3.2.jar 这两个包。  2  确认页面form表单上的提交方式为POST，enctype属性的值为“multipart/form-data”。