Struts2實現多檔案上傳功能
阿新 • • 發佈：2019-01-31
前臺form 表單：設定method=post,enctype=multipart/form-data。
struts2在原有的上傳解析器繼承上做了進一步封裝，更進一步簡化了檔案上傳。
Action需要使用3個屬性來封裝該檔案域的資訊：
（1）型別為File的*屬性封裝了該檔案域對應的檔案內容；
（2）型別為String的***FileName屬性封裝了該檔案域對應的檔案的檔案型別；
（3）型別為String的***ContentType屬性封裝了該檔案域對應的檔案的型別。
具體實現：
新建web專案
新增struts2相關包
myeclipse可直接下載，右擊專案，如下。
前臺
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <html> <body> <form action="upload.action" method="post" enctype="multipart/form-data"> <input type="file" name="upload" multiple="multiple"/> <input type="submit" value="提交"/> </form> </body> </html>
配置web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> <display-name>UploadFile</display-name> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>*.action</url-pattern> </filter-mapping> </web-app>
配置struts.xml
<?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>
<constant name="struts.enable.DynamicMethodInvocation" value="false"/>
<constant name="struts.devMode" value="true"/>
<constant name="struts.multipart.saveDir" value="/tmp"/>
<constant name="struts.custom.i18n.resources" value="app"></constant>
<package name="default" namespace="/" extends="struts-default">
<action name="upload" class="com.yf.action.UploadAction">
<result>/index.jsp</result>
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
</package>
</struts>
後臺程式碼
public class UploadAction extends ActionSupport{
private List<File> upload;
private List<String> uploadContentType;
private List<String> uploadFileName;
public List<File> getUpload() {
return upload;
}
public void setUpload(List<File> upload) {
this.upload = upload;
}
public List<String> getUploadContentType() {
return uploadContentType;
}
public void setUploadContentType(List<String> uploadContentType) {
this.uploadContentType = uploadContentType;
}
public List<String> getUploadFileName() {
return uploadFileName;
}
public void setUploadFileName(List<String> uploadFileName) {
this.uploadFileName = uploadFileName;
}
@Override
public String execute() throws Exception {
//檔案儲存路徑
String path = ServletActionContext.getServletContext().getRealPath("/images");
File file = new File(path);
//不存在則建立
if(!file.exists()){
file.mkdir();
}
//迴圈將檔案上傳到指定路徑
for(int i = 0; i< upload.size(); i++){
FileUtils.copyFile(upload.get(i), new File(file,uploadFileName.get(i)));
}
return SUCCESS;
}