Struts上传文件分为两个步骤：
1）. 首先将客户端上传的文件保存到Struts.multipart.saveDir键所指定的目录中，如果该键所对应的目录不存在，那么就保存到javax.servlet.context.tempdir环境变量所指定的目录中。
2）. Action中所定义的File类型的成员变量实际上是指向的是临时目录中的临时文件，然后在服务器端通过IO的方式将临时文件写入到指定的服务器端目录中
环境搭建：
首先看一下目录结构：
在对应的文件夹下创建以上图片中的文件
1、在com.action中新建文件上传的action,
1 package com.action; 2 3 import java.io.File; 4 import java.io.FileInputStream; 5 import java.io.FileOutputStream; 6 import java.io.InputStream; 7 import java.io.OutputStream; 8 9 import org.apache.struts2.ServletActionContext; 10 11 import com.opensymphony.xwork2.ActionSupport; 12 13 @SuppressWarnings("serial") 14 public class UploadAction extends ActionSupport { 15 16 private String username; //用户名字 17 private File file; //上传的文件 18 private String fileFileName; //获取文件名字，命名格式固定为XXXFileName 19 private String fileContentType; //获取文件的内容类型格式固定为XXXContentType 20 public String getFileContentType() { 21 return fileContentType; 22 } 23 public void setFileContentType(String fileContentType) { 24 this.fileContentType = fileContentType; 25 } 26 public String getFileFileName() { 27 return fileFileName; 28 } 29 public void setFileFileName(String fileFileName) { 30 this.fileFileName = fileFileName; 31 } 32 public File getFile() { 33 return file; 34 } 35 public void setFile(File file) { 36 this.file = file; 37 } 38 public String getUsername() { 39 return username; 40 } 41 public void setUsername(String username) { 42 this.username = username; 43 } 44 @Override 45 public String execute() throws Exception { 46 //获取目标文件的路径 47 String root = ServletActionContext.getRequest().getRealPath("/upload"); 48 //创建文件输入流 49 InputStream input = new FileInputStream(file); 50 51 System.out.println("fileFileName: " + fileFileName); 52 //在root目录下创建一个名字为fileFileName的文件 53 File destFile = new File(root,fileFileName); 54 //上传的文件输出到destFile文件中 55 OutputStream out = new FileOutputStream(destFile); 56 57 byte[] buffer = new byte[1024]; 58 59 int length = 0; 60 61 while((length = input.read(buffer)) != -1){ 62 out.write(buffer,0,length); 63 } 64 65 input.close(); 66 out.close(); 67 68 return SUCCESS; 69 } 70 }
2、在struts.properties属性文件中指定缓冲临时文件的临时目录的路径
struts.multipart.saveDir =E:/programTempFile
需要在E盘的根目录下创建一个programTempFile文件
3、fileUpload.jsp页面代码
1 <%@ page language="java" import="java.util.*" pageEncoding="GB18030"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9 <head> 10 <base href="<%=basePath%>"> 11 12 <title>My JSP 'fileUpload.jsp' starting page</title> 13 14 <meta http-equiv="pragma" content="no-cache"> 15 <meta http-equiv="cache-control" content="no-cache"> 16 <meta http-equiv="expires" content="0"> 17 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 18 <meta http-equiv="description" content="This is my page"> 19 <!-- 20 <link rel="stylesheet" type="text/css" href="styles.css"> 21 --> 22 23 </head> 24 25 <body> 26 <!-- 文件上传表单的提交方式必须是“post” 编码类型必须为：enctype="multipart/form-data" --> 27 <form action="fileUpload.action" method="post" enctype="multipart/form-data"> 28 29 username: <input type="text" name="username" /><br> 30 file: <input type="file" name="file"><br> 31 <input type="submit" value="上传文件"> 32 33 </form> 34 35 </body> 36 </html>
fileUploadResult.jsp代码
1 <%@ page language="java" import="java.util.*,java.io.*" pageEncoding="GB18030"%> 2 <%@ taglib prefix="s" uri="/struts-tags" %> 3 <% 4 String path = request.getContextPath(); 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 6 %> 7 8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 9 <html> 10 <head> 11 <base href="<%=basePath%>"> 12 13 <title>My JSP 'fileUploadResult.jsp' starting page</title> 14 15 <meta http-equiv="pragma" content="no-cache"> 16 <meta http-equiv="cache-control" content="no-cache"> 17 <meta http-equiv="expires" content="0"> 18 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 19 <meta http-equiv="description" content="This is my page"> 20 <!-- 21 <link rel="stylesheet" type="text/css" href="styles.css"> 22 --> 23 24 </head> 25 26 <body> 27 28 username: <s:property value="username"/><br> 29 name: <s:property value="fileFileName" /><br> 30 fileContentType: <s:property value="fileContentType"/><br> 31 32 33 </body> 34 </html>
3、struts.xml中配置信息
1 <struts> 2 <package name="default" extends="struts-default"> 3 <!-- 文件上传下载action --> 4 <action name="fileUpload" class="com.action.UploadAction"> 5 6 <result name="success">/fileUploadResult.jsp</result> 7 8 </action> 9 </package> 10 11 </struts>
文件上传界面：
上传信息显示
服务器端目标文件
