Struts2框架使用一個fileupload的interceptor來完成文件上傳,而我們提供相應的參數並配置後便可實現上傳的功能
第一步:提供相應的jar包
並在web.xml中配置攔截器
<filter>
<filter-name>struts2Filter</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
第二步:提供上傳文件的jsp頁面
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/upload" method="post" enctype="multipart/form-data">
<input type="file" name="upload">
<input type="submit" value="上傳">
</form>
</body>
</html>
第三步:提供相應的Action
package com.itheima.action;
import java.io.File;
import java.io.IOException;
import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport{
private File upload; //上傳的文件 需要與jsp頁面文件上傳框的name屬性一致
private String uploadContentType;//上傳文件的mimeType類型 在文件參數後加ContentType
private String uploadFileName; //上傳文件的名稱 在文件參數後加FileName
public void uploadFile(){
// 得到upload目錄在tomcat的絕對磁盤路徑
String path=ServletActionContext.getServletContext().getRealPath("/upload");
File dest = new File(path,uploadFileName);// 創建一個服務器端文件
try {
// 完成文件上傳操作
FileUtils.copyFile(upload, dest);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public File getUpload() {
return upload;
}
public void setUpload(File upload) {
this.upload = upload;
}
public String getUploadContentType() {
return uploadContentType;
}
public void setUploadContentType(String uploadContentType) {
this.uploadContentType = uploadContentType;
}
public String getUploadFileName() {
return uploadFileName;
}
public void setUploadFileName(String uploadFileName) {
this.uploadFileName = uploadFileName;
}
}
第四步:在src文件下配置struts.xml文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.devMode" value="true"></constant><!--配置常量 作用是出錯時會顯示更詳細的錯誤信息 -->
<constant name="struts.multipart.maxSize" value="20971520"></constant><!--配置常量 作用是控制文件的最大上傳大小 -->
<package name="default" namespace="/" extends="struts-default">
<action name="upload" class="com.itheima.action.UploadAction" method="uploadFile">
<interceptor-ref name="fileUpload">
<!-- <param name="maximumSize"></param> --> <!-- 設置每一個action允許的上傳文件大小 -->
<!-- <param name="allowedTypes"></param> --> <!-- 設置上傳允許的文件的mimeType類型,多個使用逗號分開 -->
<param name="allowedExtensions">jpg,txt</param> <!-- 設置上傳文件允許的後綴名,多個使用逗號分開 -->
</interceptor-ref>
<interceptor-ref name="defaultStack" /> <!-- 配置自定義攔截器後需要手動導入默認的攔截器 -->
<result name="input">/error.jsp</result>
</action>
</package>
</struts>
注:當需要上傳多個文件時,把Action接受的參數類型改爲數組
然後在上傳文件的方法中添加循環就可以