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1 在Struts2中上传文件需要 commons-fileupload-1.2.1.jar、commons-io-1.3.2.jar 这两个包。
2 确认页面form表单上的提交方式为POST，enctype属性的值为“multipart/form-data”。
fileupload.jsp页面：
1 <body> 2 <form action="<%=basePath%>lixiang/file_upload.action" method="post" enctype="multipart/form-data"> 3 选择文件：<input type="file" name="upload"/><br/> 4 <input type="submit" value="提交"/> 5 </form> 6 </body>
FileUploadAction.java
1 package com.cy.action; 2 3 import java.io.File; 4 import java.io.FileInputStream; 5 import java.io.FileNotFoundException; 6 import java.io.FileOutputStream; 7 import java.io.IOException; 8 9 import com.opensymphony.xwork2.ActionSupport; 10 11 public class FileUploadAction extends ActionSupport{ 12 13 private static final long serialVersionUID = 1L; 14 private File upload; 15 //获取上传文件类型 16 private String uploadContentType; 17 //获取上传文件名 18 private String uploadFileName; 19 //保存路径 20 private String savePath; 21 22 public String upload(){ 23 24 File dir = new File(savePath); 25 //先判断文件夹是否存在 26 if(!dir.exists()){ 27 dir.mkdir(); 28 } 29 30 //再判断文件是否已经存在 31 String filePath = savePath + "\\"+uploadFileName; 32 File file = new File(filePath);//上传后的目标文件 33 FileOutputStream out = null; 34 FileInputStream in = null; 35 if(!file.exists()){ 36 try { 37 out = new FileOutputStream(filePath); 38 in = new FileInputStream(upload); 39 40 byte[] bytes = new byte[1024]; 41 int lenth = 0; 42 while ((lenth = in.read(bytes)) > 0) { 43 out.write(bytes, 0, lenth); 44 } 45 46 } catch (FileNotFoundException e) { 47 e.printStackTrace(); 48 } catch (IOException e) { 49 e.printStackTrace(); 50 }finally{ 51 try { 52 in.close(); 53 out.close(); 54 } catch (IOException e) { 55 e.printStackTrace(); 56 } 57 } 58 } 59 60 return SUCCESS; 61 } 62 63 64 // 提供set、get方法 65 public File getUpload() { 66 return upload; 67 } 68 public void setUpload(File upload) { 69 this.upload = upload; 70 } 71 public String getUploadContentType() { 72 return uploadContentType; 73 } 74 public void setUploadContentType(String uploadContentType) { 75 this.uploadContentType = uploadContentType; 76 } 77 public String getUploadFileName() { 78 return uploadFileName; 79 } 80 public void setUploadFileName(String uploadFileName) { 81 this.uploadFileName = uploadFileName; 82 } 83 public String getSavePath() { 84 return savePath; 85 } 86 public void setSavePath(String savePath) { 87 this.savePath = savePath; 88 } 89 90 91 }
struts.xml
1 <action name="file_*" class="com.cy.action.FileUploadAction" method="{1}"> 2 <param name="savePath">E:\images</param> <!-- 设置上传文件存放的路径 --> 3 <result name="success">/layout.jsp</result> 4 <result name="input">/fileupload.jsp</result> 5 </action>
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原文地址：http://www.cnblogs.com/hellokitty1/p/5087363.html
