struts2 + jquery uploadfiy

package com.check.action; import java.io.File; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Random; import javax.servlet.http.HttpServletResponse; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; public class UploadUtilAction extends ActionSupport{ private File fileupload; //和JSP中input标记name同名 //Struts2拦截器获得的文件名,命名规则，File的名字+FileName //如此处为 'fileupload' + 'FileName' = 'fileuploadFileName' private String fileuploadFileName; //上传来的文件的名字 public File getFileupload() { return fileupload; } public void setFileupload(File fileupload) { this.fileupload = fileupload; } public String getFileuploadFileName() { return fileuploadFileName; } public void setFileuploadFileName(String fileuploadFileName) { this.fileuploadFileName = fileuploadFileName; } public String uploadFile() throws Exception { System.out.println("---------uploadFile----------"); String extName = ""; //保存文件拓展名 String newFileName = ""; //保存新的文件名 String nowTimeStr = ""; //保存当前时间 SimpleDateFormat sDateFormat; Random r = new Random(); String savePath = ServletActionContext.getServletContext().getRealPath(""); //获取项目根路径 savePath = savePath + "/pic/"; /*拼串组成要上传保存文件的路径，即：D:\Program Files\apache-tomcat-6.0.20\webapps\(项目名)\pic\secondhand 这样的路径*/ HttpServletResponse response = ServletActionContext.getResponse(); response.setCharacterEncoding("utf-8"); //务必，防止返回文件名是乱码 //生成随机文件名：当前年月日时分秒+五位随机数（为了在实际项目中防止文件同名而进行的处理） int rannum = (int) (r.nextDouble() * (99999 - 10000 + 1)) + 10000; //获取随机数 sDateFormat = new SimpleDateFormat("yyyyMMddHHmmss"); //时间格式化的格式 nowTimeStr = sDateFormat.format(new Date()); //当前时间 //获取拓展名 if (fileuploadFileName.lastIndexOf(".") >= 0){ extName = fileuploadFileName.substring(fileuploadFileName.lastIndexOf(".")); } newFileName = nowTimeStr + rannum + extName; //文件重命名后的名字 fileupload.renameTo(new File(savePath + newFileName)); //保存文件 response.getWriter().print(fileuploadFileName + " 上传成功");//向页面端返回结果信息 return null; //这里不需要页面转向，所以返回空就可以了 } }