Struts2中多文件上傳

文件上傳大體我給分這麼幾步。1：在WEB-INF/lib下面添加commons-fileupload-1.2.1.jar,commons-io-1.3.2.jar，這兩個文件全部在Struts2提供的lib包下面；2：在文件上傳的表單處做設置，將form表單的enctype設置成爲：“multipart/form-data”,提交方式設置爲post；3：做Action。

具體代碼如下：

fileupload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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>
${pageContext.request.contextPath}<br />
<form action="${pageContext.request.contextPath }/fileupload" enctype="multipart/form-data" method="post">
選擇資源1:<input type="file" name="image"><BR />
選擇資源2:<input type="file" name="image"><BR />
<input type="submit" value="上傳"/>
</form>
</body>
</html>

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>
	<package name="yuan" extends="struts-default">
		<action name="fileupload" class="com.ambow.Action.FileUploadAction">
			<result>
				/WEB-INF/page/message.jsp
			</result>
		</action>
	</package>
</struts>

FileUploadAction.java

package com.ambow.Action;

import java.io.File;

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

import com.opensymphony.xwork2.ActionSupport;

public class FileUploadAction extends ActionSupport {

	//這裏是固定的寫法,文件名子必須跟上一個表單的name屬性名字相同，都是image
	private File[] image ;
	private String[] imageFileName ;
	
	
	
	public File[] getImage() {
		return image;
	}

	public void setImage(File[] image) {
		this.image = image;
	}

	public String[] getImageFileName() {
		return imageFileName;
	}

	public void setImageFileName(String[] imageFileName) {
		this.imageFileName = imageFileName;
	}

	@Override
	public String execute() throws Exception {
		// TODO Auto-generated method stub
		//得到當前工程的目錄,然後自己再定義下保存的路徑
		String realpath = ServletActionContext.getServletContext().getRealPath("/file") ;
		//打印路徑看是否存在
		System.out.println(realpath);
		if(image != null){
			File savedir = new File(realpath) ;
			if(!savedir.exists()){
				savedir.mkdirs() ;
			}
			for(int i=0;i<image.length;i++){
				File savefile = new File(savedir,imageFileName[i]) ;
				FileUtils.copyFile(image[i], savefile) ;
			}
		}
		ServletActionContext.getServletContext().setAttribute("message", "文件上傳成功！") ;
		return SUCCESS;
	}

	
}

message.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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>
${message }
</body>
</html>

幾點注意事項：在Action中的屬性，比如image,都必須跟表單當中的屬性值一樣，都是image,還有屬性的名字都必須按照固定的格式寫，如image,imageFileName，如果不這麼寫，會報錯的。