struts实现文件上传和下载业务

首先建立一个FileAction

package com.action;
import org.apache.struts.action.*;
import javax.servlet.http.*;
import com.actionForm.FileActionForm;
import org.apache.struts.actions.DispatchAction;
import java.util.Date;
import java.text.*;
import org.apache.struts.upload.FormFile;
import java.io.*;
import java.net.URLEncoder;
import com.dao.*;

public class FileAction extends DispatchAction {

    private JDBConnection connection =new JDBConnection();
//以下方法实现文件的上传
    public ActionForward upLoadFile(ActionMapping mapping, ActionForm form,
                                    HttpServletRequest request,
                                    HttpServletResponse response) throws
            Exception {
    ActionForward forward=null;
        Date date = new Date();
        FileActionForm fileActionForm = (FileActionForm) form;
        //FormFile用于指定存取文件的类型
        FormFile file = fileActionForm.getFile(); //获取当前的文件
      // 获得系统的绝对路径 String dir = servlet.getServletContext().getRealPath("/image");
        //我上传的文件没有放在服务器上。而是存在D:D:\\loadfile\\temp\\
        String dir="D:\\loadfile\\temp\\";
        int i = 0;
   String type = file.getFileName();
   while(i!=-1){
   //找到上传文件的类型的位置，这个地方的是'.'
    i = type.indexOf(".");
  
   
    type = type.substring(i+1);
   }
// 限制上传类型为jpg,txt,rar;
   if (!type.equals("jpg") && !type.equals("txt")&& !type.equals("bmp"))
   
  {//当上传的类型不为上述类型时，跳转到错误页面。
    forward=mapping.findForward("error");
   }
   else
   {  
//    将上传时间加入文件名（这个地方的是毫秒数）   
     String times = String.valueOf(date.getTime());
   //组合成 time.type
         String fname = times + "." + type;
       //InInputStream是用以从特定的资源读取字节的方法。
          InputStream streamIn = file.getInputStream();    //创建读取用户上传文件的对象
          //得到是字节数，即byte,我们可以直接用file.getFileSize(),也可以在创建读取对象时用streamIn.available();
         // int ok=streamIn.available();          
          int ok=file.getFileSize();
          String strFee = null;
         //这个地方是处理上传的为M单位计算时，下一个是以kb,在下一个是byte;
         
          if(ok>=1024*1024)
          {
          float ok1=(((float)ok)/1024f/1024f);
           DecimalFormat myformat1 = new DecimalFormat("0.00");        
          strFee = myformat1.format(ok1)+"M";
                 System.out.println(strFee+"M");
          }
          else if(ok>1024 && ok<=1024*1024)
          {
             double ok2=((double)ok)/1024;
             DecimalFormat myformat2=new DecimalFormat("0.00");
            strFee = myformat2.format(ok2)+"kb";
                 System.out.println(strFee+"kb");
          }
          else if(ok<1024)
          {
          System.out.println("aaaaaaaaa");
           strFee=String.valueOf(ok)+"byte";
           System.out.println(strFee);
          
          }
          System.out.println( streamIn.available()+"文件大小byte");
          //这个是io包下的上传文件类
          File uploadFile = new File(dir);   //指定上传文件的位置
          if (!uploadFile.exists() || uploadFile == null) { //判断指定路径dir是否存在，不存在则创建路径
              uploadFile.mkdirs();
          }
          //上传的路径+文件名
          String path = uploadFile.getPath() + "\\" + fname;
       //OutputStream用于向某个目标写入字节的抽象类，这个地方写入目标是path，通过输出流FileOutputStream去写
          OutputStream streamOut = new FileOutputStream(path);
          int bytesRead = 0;
          byte[] buffer = new byte[8192];
          //将数据读入byte数组的一部分，其中读入字节数的最大值是8192，读入的字节将存储到，buffer[0]到buffer[0+8190-1]的部分中
          //streamIn.read方法返回的是实际读取字节数目.如果读到末尾则返回-1.如果bytesRead返回为0则表示没有读取任何字节。
          while ((bytesRead = streamIn.read(buffer, 0, 8192)) != -1) {
          //写入buffer数组的一部分，从buf[0]开始写入并写入bytesRead个字节，这个write方法将发生阻塞直至字节写入完成。
              streamOut.write(buffer, 0, bytesRead);
          }
        // 关闭输出输入流,销毁File流。
          streamOut.close();
          streamIn.close();
          file.destroy();    
          String paths=path;
          System.out.println(paths);
         String fileName = Chinese.toChinese(fileActionForm.getFileName()); //获取文件的名称
        //String fileSize = String.valueOf(file.getFileSize());
         String fileDate = DateFormat.getDateInstance().format(date);
         String sql = "insert into tb_file values('" + fileName + "','" +
         strFee + "','" + fileDate + "','" + paths + "')";
         connection.executeUpdate(sql);
         connection.closeConnection();
         forward=mapping.findForward("upLoadFileResult");
   }
        return forward;
    }
    //实现文件的下载
    public ActionForward downFile(ActionMapping mapping, ActionForm form,
                                  HttpServletRequest request,
                                  HttpServletResponse response) throws
            Exception {
        String path = request.getParameter("path");
        System.out.println(path+"111");
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        OutputStream fos = null;
        InputStream fis = null;
       
      //如果是从服务器上取就用这个获得系统的绝对路径方法。 String filepath = servlet.getServletContext().getRealPath("/" + path);
        String filepath=path;
        System.out.println("文件路径"+filepath);
        File uploadFile = new File(filepath);
        fis = new FileInputStream(uploadFile);
        bis = new BufferedInputStream(fis);
        fos = response.getOutputStream();
        bos = new BufferedOutputStream(fos);
        //这个就就是弹出下载对话框的关键代码
        response.setHeader("Content-disposition",
                           "attachment;filename=" +
                           URLEncoder.encode(path, "utf-8"));
        int bytesRead = 0;
        //这个地方的同上传的一样。我就不多说了，都是用输入流进行先读，然后用输出流去写，唯一不同的是我用的是缓冲输入输出流
        byte[] buffer = new byte[8192];
        while ((bytesRead = bis.read(buffer, 0, 8192)) != -1) {
            bos.write(buffer, 0, bytesRead);
        }
        bos.flush();
        fis.close();
        bis.close();
        fos.close();
        bos.close();
        return null;
    }

}

FileActionForm

     

package com.actionForm;

import org.apache.struts.action.*;
import org.apache.struts.upload.*;

public class FileActionForm extends ActionForm {
    private String fileName;//上传文件的名称
    private String fileSize;//上传文件的大小
    private String filePath;//上传文件到服务器的路径
    private String fileDate;//上传文件的日期
    private FormFile file;//上传文件

    public String getFileName() {
        return fileName;
    }

    public FormFile getFile() {
        return file;
    }

    public String getFileSize() {
        return fileSize;
    }

    public String getFilePath() {
        return filePath;
    }

    public String getFileDate() {
        return fileDate;
    }

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

    public void setFile(FormFile file) {
        this.file = file;
    }

    public void setFileSize(String fileSize) {
        this.fileSize = fileSize;
    }

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

    public void setFileDate(String fileDate) {
        this.fileDate = fileDate;
    }

}

index.jsp 此位置的form是javabeen的对象，这个javabeen中存取的图片的相关信息

<table width="264" height="81" border="0" align="center" cellpadding="0" cellspacing="0">
                <tr>
                  <td width="115" rowspan="4" align="center"><img src="<%=form.getFilePath()%>" width="100" height="100"></td>
                  <td width="133" align="center">图片名称：<%=form.getFileName()%></td>
                </tr>
                <tr align="center">
                  <td>图片大小：<%=form.getFileSize()%></td>
                </tr>
                <tr align="center">
                  <td>上传日期:<%=form.getFileDate()%></td>
                </tr>
                <tr>
                  <td align="center"><a href="fileAction.do?method=downFile&path=<%=form.getFilePath()%>" ><img src="priture/bottond.jpg"></a>

                  </td>
                </tr>
            </table>

<html:form action="fileAction.do?method=upLoadFile" enctype="multipart/form-data" onsubmit="return Mycheck()">
        <table height="52" border="0" align="center" cellpadding="0" cellspacing="0">
          <tr align="center">
            <td width="60" height="26">图片名称:</td>
            <td width="160"> <html:text property="fileName"/> </td>
            <td width="60">图片路径:</td>
            <td width="198"> <html:file property="file"/> </td>
          </tr>
          <tr align="right">
            <td height="26" colspan="4"> <html:submit>上传</html:submit> </td>
          </tr>
        </table>
   </html:form>

struts-config.xml  

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">

<struts-config>
<form-beans>
    <form-bean name="fileActionForm" type="com.actionForm.FileActionForm" />
</form-beans>
<action-mappings>
    <action name="fileActionForm" parameter="method" path="/fileAction" scope="request" type="com.action.FileAction" validate="true">
        <forward name="upLoadFileResult" path="/result.jsp"/>
        <forward name="error" path="/fail.jsp"></forward>
    </action>
</action-mappings>
<message-resources parameter="ApplicationResources" />
</struts-config>