更详细的介绍参见：
http://www.blogjava.net/max/archive/2007/03/21/105124.html
所要用到的jar
commons-fileupload-1.2.1.jar
commons-io-1.3.2.jar
commons-logging-1.0.4.jar
commons-logging-1.1.1.jar
freemarker-2.3.13.jar
ognl-2.6.11.jar
struts2-core-2.1.6.jar
xwork-2.1.2.jar
如果是直接用SSH中的Strutsjar包 记得删除Struts2-Spring-Plugin
否则系统会认为你spring的部分没有配置上 对于仅使用struts的项目而言 这个包不是多余 而是不能有
Eclipse JEE编辑器不是那么的智能 创建web工程没有加入Servlet的jar包 需要自己手动添加
web.xml
<?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"> <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> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
struts配置
<?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.devMode" value="true"></constant> <constant name="struts.action.extension" value="do,action"></constant> <package name="struts2" extends="struts-default" namespace="/"> <action name="UploadAction_*" class="action.UploadAction" method="{1}"> <result name="success">/upload.jsp</result> </action> </package> </struts>
页面
<%@page contentType="text/html; charset=GBK" language="java"%> <%@taglib prefix="s" uri="/struts-tags"%> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//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> <s:form action="UploadAction_uploadEssays.action" method="POST" enctype="multipart/form-data"> <s:file name ="myFile" /> <s:file name ="myFile" /> <s:file name ="myFile" /> <s:textfield name="caption" label="Caption" /> <s:submit /> </s:form> </body> </html>
UploadAction
package action; 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 UploadAction extends ActionSupport { private static final long serialVersionUID = 572146812454l; private static final int BUFFER_SIZE = 16 * 1024; // 这里的BUFFER_SIZE // 表示一个数据缓冲区是16KB // 所以写出的文件最小是16KB private File[] myFile; //myFile就是用户准备上传的文件 private String[] myFileContentType; private String[] myFileFileName; //用户上传文件的真实文件名 //当然了 这里的属性命名是任意的 //但是要保证和页面元素中的 name属性的值要匹配 //比如 页面中input 的name是myFile 我这里就应该有 setMyFile getMyFile //为了减少出错， 属性都用对应的名字好了 //若文件对象的名字是xxx 文件类型就应是 xxxContentType 真实文件名则应是xxxFileName // private String caption; public File[] getMyFile() { return myFile; } public void setMyFile(File[] myFile) { this.myFile = myFile; } public String[] getMyFileContentType() { return myFileContentType; } public void setMyFileContentType(String[] myFileContentType) { this.myFileContentType = myFileContentType; } public String[] getMyFileFileName() { return myFileFileName; } public void setMyFileFileName(String[] myFileFileName) { this.myFileFileName = myFileFileName; } private static String getExtention(String fileName) { int pos = fileName.lastIndexOf("."); return fileName.substring(pos); } private static void copy(File src, File dst) { System.out.println("000000 src dst "+src.getPath()+" "+dst.getPath()); try { InputStream in = null; OutputStream out = null; try { in = new BufferedInputStream(new FileInputStream(src), BUFFER_SIZE); out = new BufferedOutputStream(new FileOutputStream(dst), BUFFER_SIZE); // 上传的最小文件不能小于 1 KB 否则会出现找不到文件的错误 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(); } } // 为了保证上传文件不会重名 // 文件名以当前毫秒数保存 private String saveFileName; // 以当前毫秒数为文件名 public String uploadEssays() { for (int i = 0; i < myFile.length; i++) { saveFileName = new Date().getTime() + getExtention(myFileFileName[i]); // writeFile 就是以当前毫秒数为文件名的文件 /*File writeFile = new File(ServletActionContext.getServletContext() .getRealPath("/files") + "/" + saveFileName);*/ File writeFile=new File("D:/Workspaces8.6_J2EE/files/"+saveFileName); System.out.println("000000000 tmp "+myFile[i]); copy(myFile[i], writeFile); } return SUCCESS; } }
！！！
(ServletActionContext.getServletContext().getRealPath("/files") 这里得到文件路径会因为操作系统不同而由变化
所以上传前线弄清楚到底位置在哪里 或者自己写一个确定的绝对路径
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