Struts2实现文件上传

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前言

作为Struts2的初学者，首先使用一下Struts2，体会一下这个框架带来的方便。

1. ImageUploadForm.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><h4>上传文件</h4><s:form action="ImageUpload" method="post"enctype="multipart/form-data"><s:file name="pic" label="Picture" /><s:submit /></s:form></body></html>

注：这是使用到了Struts2的标签库

2. ImageUpload.java

package example;import org.apache.logging.log4j.LogManager;import org.apache.logging.log4j.Logger;import com.opensymphony.xwork2.ActionSupport;import java.io.File;public class ImageUpload extends ActionSupport {/** *  */private static final long serialVersionUID = 1L;File pic;String picContentType;String picFileName;private final Logger logger = LogManager.getFormatterLogger(this.getClass());@Overridepublic String execute() throws Exception {logger.debug(pic);logger.debug(picContentType);logger.debug(picFileName);File myFile = new File("D:"+File.separator+picFileName);logger.debug(pic.renameTo(myFile));return super.execute();}public File getPic() {return pic;}public void setPic(File pic) {this.pic = pic;}public String getPicContentType() {return picContentType;}public void setPicContentType(String picContentType) {this.picContentType = picContentType;}public String getPicFileName() {return picFileName;}public void setPicFileName(String picFileName) {this.picFileName = picFileName;}}

Method Signature

Description

setX(File file)

The file that contains the content of the uploaded file. This is a temporary file and file.getName() will not return the original name of the file

setXContentType(String contentType)

The mime type of the uploaded file

setXFileName(String fileName)

The actual file name of the uploaded file (not the HTML name)

3. example.xml

<action name="AddImage"><result>/WEB-INF/jsp/example/ImageUploadForm.jsp</result></action><action name="ImageUpload" class="example.ImageUpload"><result>/WEB-INF/jsp/example/ImageUploadForm.jsp</result><result name="input">/WEB-INF/jsp/example/ImageUploadForm.jsp</result></action>

4. execute方法

File myFile = new File("D:"+File.separator+picFileName);logger.debug(pic.renameTo(myFile));

将文件保存在D盘的根目录下，仍使用原来的文件名。

5.效果

选择文件

完成

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