struts之上传文件

本文主要探讨了在Struts框架中实现文件上传的过程,包括关键配置和可能出现的异常处理。通过对上传过程的解析,帮助读者理解如何在Struts中集成文件上传功能。

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struts之上传文件
用的是struts自带的org.apache.struts.upload.FormFile,这篇文章参考了网上一些资料,在这做个小结,为日后参考。
首先是提交页面,代码如下:

<form action="DownAddSubmit.do" method="post" ENCTYPE="multipart/form-data">
标题:<input size=80 name="downtitle" value=""/><br/>
图片:<input type="file" size="50" name="thePic"/><br/>
文件:<input type="file" size="50" name="theFile"/><br/>
<input type="submit" value="确定"/>
</form>

我这里假设上传2个文件,1个图片,1个别的文件,其中ENCTYPE="multipart/form-data"务必需要这样写的,当然这里也可以
传其他的东西,我传了个标题,文本的,把这个标题传入数据库,把图片和文件上传到服务器空间,同时把这2个文件名字也传
到数据库。
先配置下struts-config.xml,如下:
<form-beans><form-bean name="downForm" type="Wap.DownForm" /></formbeans>
<action path="/DownAddSubmit" type="Wap.DownAddSubmitAction" name="downForm" scope="request"
input="/wrong.jsp"/>
 
接下来先编写DownForm.java,主要进行set和get。
package Wap;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.*;
import org.apache.struts.upload.*;     //包的导入
public class DownForm extends ActionForm{
 protected String downtitle;
 protected FormFile theFile;
 protected FormFile thePic;
public String getDowntitle(){
  return downtitle;
 }
 public void setDowntitle(String downtitle){
  this.downtitle=downtitle;
 }
 
 public FormFile getTheFile(){
  return theFile;
 }
 public void setTheFile(FormFile theFile){
  this.theFile=theFile;
 }
 
 public FormFile getThePic(){
  return thePic;
 }
 public void setThePic(FormFile thePic){
  this.thePic=thePic;
 }
}
这里可以增加验证,为了简便,省略。。。
DownForm.java编译后,编写DownAddSubmitAction.java
代码如下:
package Wap;    //最重要的action
import javax.servlet.http.*;
import org.apache.struts.action.*;
import org.apache.struts.upload.*;
import javax.servlet.ServletContext;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.*;
import java.io.*;
import javax.servlet.http.*;
public final class DownAddSubmitAction extends Action{ 
 public ActionForward execute(
  ActionMapping mapping,
  ActionForm form,
  HttpServletRequest request, 
  HttpServletResponse response) throws Exception {
  
     DownForm downform=(DownForm)form;
     FormFile theFile=downform.getTheFile();
     FormFile thePic=downform.getThePic();
    String downtitle=new String(downform.getDowntitle().trim().getBytes("iso-8859-1"),"utf-8");   
//编码的转换
    HttpSession session = request.getSession();
     Vector downList = new Vector();
     ServletContext context = servlet.getServletContext();
  DataSource dataSource = (DataSource)context.getAttribute("sqlserver");
  DB db=new DB(dataSource);       //这里需要DB数据库连接等操作
  String PageForward;
  Down down=new Down();         //这里需要Down这个bean,重要是为了想数据库传数据
  down.setDowntitle(downtitle);   //Down大太,这里不传了
//下面进行上传文件
 
try{
    InputStream stream=theFile.getInputStream();
    String filePath=context.getRealPath("/");
    ByteArrayOutputStream baos=new ByteArrayOutputStream();
    OutputStream bos=new FileOutputStream(filePath+"/"+theFile.getFileName());
    int bytesRead=0;
    byte[] buffer=new byte[8192];
    while((bytesRead=stream.read(buffer,0,8192))!=-1){
     bos.write(buffer,0,bytesRead);
    }
    bos.close();
    stream.close();
   }catch(Exception e){
    System.err.print(e);
   }
  //下面进行上传图片
  try{
    InputStream istream=thePic.getInputStream();
    String picPath=context.getRealPath("/");
    ByteArrayOutputStream baos2=new ByteArrayOutputStream();
    OutputStream bos2=new FileOutputStream(picPath+"/"+thePic.getFileName());
    int bytesRead2=0;
    byte[] buffer2=new byte[8192];
    while((bytesRead2=istream.read(buffer2,0,8192))!=-1){
     bos2.write(buffer2,0,bytesRead2);
    }
    bos2.close();
    istream.close();
   }catch(Exception e){
    System.err.print(e);
   }
 
  String downpath=null;
  String picpath=null;
  try{
   downpath=theFile.getFileName();
   picpath=thePic.getFileName();
  }catch(Exception e){
  }
 
  down.setDownpath(downpath);
  down.setPicpath(picpath);
  ActionMessages errors=new ActionMessages();
  if(down.Add(db)){
   PageForward="toAddsuccess";
  }else{//省略错误机制
      PageForward="toWrong";
  }
  db.close();
  return (mapping.findForward(PageForward));
    }
}
然后随便写个正确页面就可以了。
还需要在struts-config.xml增加转向,简单,省略
在windows2003+tomcat4+struts1.1+mssql成功运行。
不足之处,还望高人指点,不胜感激!!!
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