文件下载

 

 

import java.io.File;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import org.apache.struts2.ServletActionContext;

import com.huawei.po.Vo;
import com.opensymphony.xwork2.ActionSupport;

public class DownFileAction extends ActionSupport {

 private String filePath;// 获取配置文件里存放的参数

 private String fileName;// 获取页面传来的参数

 private List<Vo> fileList = new ArrayList<Vo>();// 获取后台查询的文件信息

 public String getFilePath() {
  return filePath;
 }

 public void setFilePath(String filePath) {
  this.filePath = filePath;
 }

 public String getFileName() {
  return fileName;
 }

 public void setFileName(String fileName) {
  this.fileName = fileName;
 }

 public List<Vo> getFileList() {
  return fileList;
 }

 public void setFileList(List<Vo> fileList) {
  this.fileList = fileList;
 }

 
 
 /**
  * 获取服务器指定目录中的所有的文件信息
  * @return
  */
 public String findFile() {
  File file = new File(ServletActionContext.getServletContext()
    .getRealPath(filePath));
  System.out.println(file);
  File files[] = file.listFiles();
  if (files.length > 0) {
   for (File f : files) {
    Vo vo = new Vo();
    vo.setName(f.getName());
    vo.setSize(f.length());
    fileList.add(vo);
   }
  }
  System.out.println(fileList.size());
  return "success";
 }
 
 
 public InputStream getInputStream(){
  try {
   String downFileName=new String(fileName.getBytes("ISO-8859-1"),"UTF-8");
   return ServletActionContext.getServletContext().getResourceAsStream(this.filePath+"/"+downFileName);
  } catch (UnsupportedEncodingException e) {
   e.printStackTrace();
  }
  
  return null;
 }

}

 

 

 

 

 

<action name="downfile" class="com.huawei.action.DownFileAction">
    <param name="filePath">/UploadFiles</param>
   <result type="stream">
    <param name="inputStream">getInputStream</param><!-- 注意大小写,这个流比较重要 -->
    <param name="contentDisposition">attachment;filename=${fileName}</param>
   </result>
  </action>