上篇理了一下Struut 2实现文件上传功能的思路，下面接着来看一下多文件上传是如何实现的。
1、 多文件上传也是在单文件上传的基础上，稍微修改一下数据类型和实现方法，即可完成，思路都是大致相同的。
2、 仍然是使用上一篇的项目结构和代码，需要修改的只是UploadAction.java、upload.jsp这两个文件。
3、 修改后的UploadAction.java、upload.jsp这两个文件如下：
UploadAction.java
package com.upload.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import javax.servlet.ServletContext;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport{
private List<File> upload; //上传文件
private List<String> uploadFileName; //上传的文件名
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 String upload() throws Exception{
//如果选择了上传功能，则执行上传操作；否则，不作任何操作
if(getUpload() != null){
//遍历，对每个文件进行读/写操作
for(int i = 0; i < upload.size(); i++){
//根据上传的文件得到输入流
InputStream is = new FileInputStream(getUpload().get(i));
//指定输出流地址，此处是输出到服务器项目的根目录下的images/userPhoto下
OutputStream os = new FileOutputStream(getWebRootPath() + "images\\userPhoto\\" + getUploadFileName().get(i));
byte buffer[] = new byte[1024];
int count = 0;
//把文件写到指定位置的文件中
while((count = is.read(buffer)) > 0){
os.write(buffer, 0, count);
}
//关闭输出流对象
os.close();
//关闭输入流对象
is.close();
//返回
}
return SUCCESS;
}
else {
return ERROR;
}
}
/**
* 获得web项目根目录
*/
public String getWebRootPath() throws Exception {
ActionContext actionContext = ActionContext.getContext();
ServletContext servletContext = (ServletContext)actionContext.get(ServletActionContext.SERVLET_CONTEXT);
String rootPath = servletContext.getRealPath("/");
return rootPath;
}
}
upload.jsp
<%@ 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>文件上传</title>
</head>
<body>
<s:form action="upload.action" method="post" enctype="multipart/form-data">
<div>
<label for="photoPath1">上传文件一：</label>
<input type="text" id="photoPath1" disabled="disabled"/>
<input type="button" onclick="myfile1.click();" value="选择文件" id="select1"/><br />
<input type="file" id="myfile1" name="upload" onchange="photoPath1.value=this.value" style="display:none" />
</div>
<div>
<label for="photoPath2">上传文件二：</label>
<input type="text" id="photoPath2" disabled="disabled"/>
<input type="button" onclick="myfile2.click();" value="选择文件" id="select2"/><br />
<input type="file" id="myfile2" name="upload" onchange="photoPath2.value=this.value" style="display:none" />
</div>
<div>
<label for="photoPath3">上传文件三：</label>
<input type="text" id="photoPath3" disabled="disabled"/>
<input type="button" onclick="myfile3.click();" value="选择文件" id="select"/><br />
<input type="file" id="myfile3" name="upload" onchange="photoPath3.value=this.value" style="display:none" />
</div>
<input type="submit" value="上传" />
</s:form>
</body>
</html>
修改代码后，通过浏览器访问该项目的upload.jsp即可看到看到上传页面。
原文地址：http://blog.csdn.net/wangcunhuazi/article/details/40650895
