struts2文件上传下载源代码

package com.action; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.InputStream; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import java.util.List; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; import com.sun.org.apache.regexp.internal.REUtil; public class DownloadAction extends ActionSupport { /** * serialVersionUID:TODO（用一句话描述这个变量表示什么） * * @since Ver 1.1 */ private static final long serialVersionUID = 1L; private Dao dao=new Dao(); private List<FileItem>list; private String fileId; private FileItem fileItem; //获得list public String list() { list=dao.getFileList(); return "list-success"; } //获得文件 public String get() { fileItem=dao.getFileItem(fileId); return "get-success"; } //获得输入流 public InputStream getInputStream() { try { String path=ServletActionContext.getServletContext().getRealPath("/"); String fileName=path+fileItem.getLocationPath(); FileInputStream fis=new FileInputStream(fileName); return fis; } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } //获得文件类型 public String getContentType() { return fileItem.getContentType(); } //获得文件下载位置 public String getContentDisposition() { try { return "attachment;filename="+URLEncoder.encode(fileItem.getFileName(),"utf-8"); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } //获得文件字节大小 public int getContentLength() { return fileItem.getContentLength(); } public List<FileItem> getList() { return list; } public void setList(List<FileItem> list) { this.list = list; } public String getFileId() { return fileId; } public void setFileId(String fileId) { this.fileId = fileId; } }