jquery_uploadify实现的下载进度条

package com.fileUpload.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 = 2854105381965508552L; private static final int BUFFER_SIZE = 20 * 1024; // 20K private File myFile; // 与页面 <input type="file"> 控件的 name 保持一致 private String fileName; // private String contentType; public File getMyFile() { return myFile; } public void setMyFile(File myFile) { this.myFile = myFile; } public String getFileName() { return fileName; } // 是setMyFileFileName而不是setFileName 。 struts2的规则。MyFile 是上面private File // myFile public void setMyFileFileName(String fileName) { this.fileName = fileName; } public String getContentType() { return contentType; } // 同上 public void setMyFileContentType(String contentType) { this.contentType = contentType; } public String execute() { String newFileName = new Date().getTime() + getExtention(fileName); File imageFile = new File(ServletActionContext.getServletContext() .getRealPath("/upload") + "/" + fileName); upload(myFile, imageFile); return SUCCESS; } private static void upload(File src, File dst) { try { InputStream in = null; OutputStream out = null; try { in = new BufferedInputStream(new FileInputStream(src), BUFFER_SIZE); out = new BufferedOutputStream(new FileOutputStream(dst), BUFFER_SIZE); 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(); } } private static String getExtention(String fileName) { int pos = fileName.lastIndexOf("."); return fileName.substring(pos); } }