struts2实现多文件上传
参照struts2官网的例子做了一个用struts2实现多文件上传的例子，这里是上传图片文件。
ShowUploadMore.jsp上传成功页面，imageFileName[0]为取数组值（图片名称），与java后台对应，页面通过取得图片地址显示上传后的图片
web.xml文件，主要是配置struts2的过滤器
启动服务，访问http://localhost:8080/struts2upload/multiFileUpload.jsp即可看到效果。
- 所需要应用的包
- 页面
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <%@ taglib prefix="s" uri="/struts-tags"%> <!DOCTYPE html PUBLIC "-//W3C//DTDXHTML1.0Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Struts2FileUpload</title> </head> <body> <s:form action="multiUpload" method="POST" enctype="multipart/form-data"> <s:file label="File(1)" name="upload" /> <s:file label="File(2)" name="upload" /> <s:file label="FIle(3)" name="upload" /> <s:submit /> </s:form> </body> </html>
ShowUploadMore.jsp上传成功页面，imageFileName[0]为取数组值（图片名称），与java后台对应，页面通过取得图片地址显示上传后的图片
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTDXHTML1.0Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> Struts 2 File Upload </title>
</head>
<body>
<div style="padding:3px; border:solid 1px #cccccc; text-align:center">
<img src ='UploadImages/<s:property value ="imageFileName[0]" />'/>
<img src ='UploadImages/<s:property value ="imageFileName[1]" />'/>
<img src ='UploadImages/<s:property value ="imageFileName[2]" />'/>
<br />
<s:property value ="caption" />
</div>
</body>
</html>
- action类MultiFileUploadAction.java,处理三个上传的图片文件，用数组实现。在工程下（WebRoot下）新建一个UploadImages文件夹，用于存放上传的图片
package com.tutorial;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class MultiFileUploadAction extends ActionSupport {
private static final long serialVersionUID = 572146812454l;
private static final int BUFFER_SIZE = 16 * 1024;
/*
* 多文件上传(图片)
*/
private String[] imageFileName = new String[3];
private File[] uploads;
private String[] uploadFileNames;
private String[] uploadContentTypes;
public String[] getImageFileName() {
return imageFileName;
}
public File[] getUpload() {
return this.uploads;
}
public void setUpload(File[] upload) {
this.uploads = upload;
}
public String[] getUploadFileName() {
return this.uploadFileNames;
}
public void setUploadFileName(String[] uploadFileName) {
this.uploadFileNames = uploadFileName;
}
public String[] getUploadContentType() {
return this.uploadContentTypes;
}
public void setUploadContentType(String[] uploadContentType) {
this.uploadContentTypes = uploadContentType;
}
private static void copy(File src, File dst) {
try {
InputStream in = null;
OutputStream out = null;
try {
in = new BufferedInputStream(new FileInputStream(src),
BUFFER_SIZE);
out = new BufferedOutputStream(new FileOutputStream(dst),
BUFFER_SIZE);
byte[] buffer = new byte[BUFFER_SIZE];
while (in.read(buffer) > 0) {
out.write(buffer);
}
} finally {
if (null != in) {
in.close();
}
if (null != out) {
out.close();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
private static String getExtention(String fileName) {
int pos = fileName.lastIndexOf(".");
return fileName.substring(pos);
}
@Override
public String execute() {
int i = 0;
for(String fileName:uploadFileNames){
imageFileName[i] = new Date().getTime()+i + getExtention(fileName);
File imageFile = new File(ServletActionContext.getServletContext()
.getRealPath("/UploadImages")
+ "/" + imageFileName[i]);
copy(uploads[i++], imageFile); //写文件到UploadImages文件夹
}
return SUCCESS;
}
}
- 配置文件
<?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>
<constant name="struts.custom.i18n.resources" value="uploadMessage"/>
<package name="fileUploadDemo" extends="struts-default">
<action name="multiUpload" class="com.tutorial.MultiFileUploadAction">
<interceptor-ref name="fileUploadStack"/>
<result name="success">/ShowUploadMore.jsp</result>
<!-- 多文件上传 -->
</action>
</package>
</struts>
web.xml文件，主要是配置struts2的过滤器
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Struts 2 Fileupload</display-name>
<filter>
<filter-name>struts-cleanup</filter-name >
<filter-class>
org.apache.struts2.dispatcher.ActionContextCleanUp
</filter-class >
</filter>
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts-cleanup</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
启动服务，访问http://localhost:8080/struts2upload/multiFileUpload.jsp即可看到效果。