java Struts2框架下實現文件上傳功能

本文實例為大家分享了Struts2框架實現文件上傳的方法，供大家參考，具體內容如下

struts2的配置過程

（1）在項目中加入jar包

（2）web.xml中filter（過濾器）的配置

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <display-name></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>/*</url-pattern> </filter-mapping></web-app>

（3）struts.xml配置文件的編寫

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5"xmlns="http://java.sun.com/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><display-name></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>/*</url-pattern></filter-mapping></web-app>

（4）action類的編寫

package com.xmgc.sc.action; import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException; import org.apache.struts2.ServletActionContext; public class MyUpLoadAction { private String title; private File upload;//與form表單中的file文件類型的名字是一樣的private String uploadContentType;//前綴必須要是上面的upload private String uploadFileName; public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } 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; } /* public String getSavePath() { //ServletContext cxt=ServletActionContext.getServletContext(); //String path=cxt.getRealPath("/"); //這個獲取的path為：http://localhost:8080/sc //上傳以後變為E:/software/apache-tomcat-6.0.45/webapps/sc return savePath; } public void setSavePath(String savePath) { //E:/software/apache-tomcat-6.0.45/webapps/sc/myupload this.savePath = ServletActionContext.getServletContext().getRealPath("/myupload"); }*/ public String execute() throws IOException{ System.out.println(title);//標題System.out.println(uploadContentType);//準備上傳的文件的文件類型System.out.println(uploadFileName);//準備上傳的文件的文件名,記住還有擴展名System.out.println(upload); String realPath=ServletActionContext.getServletContext().getRealPath("/"); String path=realPath+"myupload/"+uploadFileName; System.out.println(realPath); System.out.println(path); FileInputStream fis=new FileInputStream(upload); FileOutputStream fos=new FileOutputStream(path); byte[] bytes=new byte[1024];//定義一個1024大小的字節數組int len=-1;//用來做標誌位while((len=fis.read(bytes))>0){ fos.write(bytes, 0, len); } return null; }}

（5）JSP頁面的編寫

<%@ page contentType="text/html;charset=utf-8"%> <!-- enctype="multipart/form-data",這個是最重要的配置--><form action="myupload.action" enctype="multipart/form-data" method="post"> 文件名：<input type="text" name="title"/><br/> 上傳：<input type="file" name="upload"/><br/> <input type="submit" value="上傳"/></form>

經過這次總結，感覺struts2框架下的單文件的上傳還是非常簡單的，只要獲取要存儲在什麼地方的地址，再通過輸入輸出流，寫到這個地址中去就行了。絕大部分工作，struts2已經幫我們做好了。

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。