struts2文件上传

 参考http://www.cxybl.com/html/struts/201110317359.html详解struts2文件上传下载的原理
HTTP上传下载的方式，另外还有通过ftpclient实现文件上传下载（ftp协议，这里不涉及）
下面的代码只是将copy的方法用common-io.jar中的FileUtils.copyFile替代了
另外AbstractRequireXAwareAction提供了request、session、application的获取
import java.io.File;

import java.io.IOException;
import org.apache.commons.io.FileUtils;
import com.alpha.web.action.base.AbstractRequireXAwareAction;
@SuppressWarnings("serial")

public class FileUploadAction extends AbstractRequireXAwareAction {

 // 文件标题

 private String title;

 // 上传文件域对象

 private File upload;

 // 上传文件名

 private String uploadFileName;

 // 上传文件类型

 private String uploadContentType;

 //可以放到配置文件里

 private String dest = "upload/";
 public void upload() {

  System.out.println("----------------");

  System.out.println(title);

  System.out.println(upload);

  System.out.println(uploadFileName);

  System.out.println(uploadContentType);

  System.out.println("----------------");
  String filePath = request.getSession().getServletContext().getRealPath(dest);

  File file = new File(filePath);

  if (!file.exists()) {

   file.mkdir();

  }

  file = new File(filePath + "/" + uploadFileName);

  System.out.println(file.getName());
  copyFile(upload, file);
 }
 private void copyFile(File src, File dest) {

  try {

   FileUtils.copyFile(src, dest);

   System.out.println("copy success...");

  } catch (IOException e) {

   e.printStackTrace();

  }

 }
 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 getUploadFileName() {

  return uploadFileName;

 }
 public void setUploadFileName(String uploadFileName) {

  this.uploadFileName = uploadFileName;

 }
 public String getUploadContentType() {

  return uploadContentType;

 }
 public void setUploadContentType(String uploadContentType) {

  this.uploadContentType = uploadContentType;

 }
 public FileUploadAction() {

 }

}