上传任意多个文件？？？？

用JSP写了一个上传文件的页面，你参考参考，文件上传到应用服务器根目录，然后你可以把路径写入数据库，以供下载。（以Excel为例，可以换成其他后缀名，见第二个页面）
----------------------------- 页面一 ---------------------------------------------------------------------------------
<%@ page contentType="text/html; charset=GBK" language="java" import="java.sql.*,conn.*" errorPage="error.jsp" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK" />
<title>上传页面</title>
<style type="text/css">

</style>
<SCRIPT LANGUAGE="JavaScript">

</SCRIPT>
</head><body>
<script language="javascript">var xx = (document.body.clientWidth - 300)/2;
var yy = 200;
var s ;
s='<div id="Loading"  style="display:none;position:absolute;z-index:3; top:'+yy+'px; left:'+xx+'px; width:300;height:60;border-width:1;border-style:ridge;background-color:#CCCCCC;padding-top:10px; s:cross">';
document.write(s);
</script><center>
<table style="display:block" width="300" height="60" border="0" cellpadding="0" cellspacing="0">
  <tr>
    <td width="300">
        <div align="center">
            <p><font color="blue" style="font-size: 14px;"> 数据正在处理中，请等待......</p>
        </div>
    </td>
  </tr>
</table>
</center>
</div>
<p align="center" class="STYLE1">文件上传</p><br>
<%
String action="indexThree.jsp";
String t = String.valueOf(System.currentTimeMillis());
%><form  name="form1" method="post" action=<%=action%> onSubmit="Window_Load()"  enctype="multipart/form-data">
<table width="600" border="0" align="center" cellpadding="0" cellspacing="0">
  <tr>
    <td><br /><div align="center"><span class="STYLE2">请选择要上传的文件名：</span>
        <input type="file" name="filename" />
    </div><br /></td>
  </tr>
  <tr>
    <td><div align="center">
        <input type="submit" name="submit" value="确定" class="pButton" />  
        <input name="" type="reset" value="重置" class="pButton" /></div>
      </td>
  </tr>
</table>
</form>
</body>
</html>------------------------------------------- 页面二 --------------------------------------------------
<%@ page contentType="text/html;charset=GB2312" language="java"
    import="com.jspsmart.upload.*,
        java.util.*,
java.lang.*,
java.text.SimpleDateFormat"
errorPage="error.jsp" %>
<jsp:useBean id="mySmartUpload" scope="page" class="com.jspsmart.upload.SmartUpload" />

<html xmlns="http://www.w3.org/1999/xhtml"><head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK" />
</head>
<body>
<%
String trace = "";try {
//生成文件名   日期+随即数
SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddhhmmss");
    Date today = Calendar.getInstance().getTime();
String sDate = formatter.format(today);
Random rd=new Random();
    int iRd=rd.nextInt();
if (iRd<0){
iRd=(-1)*iRd;
}

String myFileName = sDate+String.valueOf(iRd); // 序号，保证文件不重名
javax.naming.Context env = (javax.naming.Context) new javax.naming.InitialContext().lookup("java:comp/env");
String filepath= (String) env.lookup("uploadpath");

    mySmartUpload.initialize(pageContext);
    mySmartUpload.setMaxFileSize(10*1024*1024);
    mySmartUpload.setAllowedFilesList("xls");
    mySmartUpload.upload();
    com.jspsmart.upload.File myFile = mySmartUpload.getFiles().getFile(0);
    if (!myFile.isMissing()){
        trace=filepath + "/" + myFileName + ".xls";
        myFile.saveAs(trace,mySmartUpload.SAVE_PHYSICAL);
    } else {
        throw new Exception("请选择要导入的文件！");
    }
}catch(Exception e){
throw new Exception("上传文件失败，具体原因为：" + e.getMessage());
}

%>
<script LANGUAGE="JavaScript" >
var str="";
str="<%=trace%>";
window.parent.returnValue=str;
window.parent.close();
</script></body>
</html>

方法很多，最简单的就是使用struts！他也可以实现上传多个文件，只是要注意下命名的问题就可用了！

struts 的 FormItem 有支持的方法去看看吧！

首先，创建文件上传页面FileUpload.jsp，内容如下：<% @ page language = " java " contentType = " text/html; charset=utf-8 " pageEncoding = " utf-8 " %>
<% @ taglib prefix = " s " uri = " /struts-tags " %> <! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
< html xmlns ="http://www.w3.org/1999/xhtml" >
< head >
    < title > Struts 2 File Upload </ title >
</ head >
< body >
    < s:form action ="fileUpload" method ="POST" enctype ="multipart/form-data" >
        < s:file name ="myFile" label ="Image File" />
        < s:textfield name ="caption" label ="Caption" />
        < s:submit />
    </ s:form >
</ body >
</ html > 清单2 FileUpload.jsp
在FileUpload.jsp中，先将表单的提交方式设为POST，然后将enctype设为multipart/form-data，这并没有什么特别之处。接下来，<s:file/>标志将文件上传控件绑定到Action的myFile属性。其次是FileUploadAction.java代码： package tutorial; 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 FileUploadAction extends ActionSupport  {
     private static final long serialVersionUID = 572146812454l ;
     private static final int BUFFER_SIZE = 16 * 1024 ;

     private File myFile;
     private String contentType;
     private String fileName;
     private String imageFileName;
     private String caption;

     public void setMyFileContentType(String contentType)  {
         this .contentType = contentType;
    }

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

     public void setMyFile(File myFile)  {
         this .myFile = myFile;
    }

     public String getImageFileName()  {
         return imageFileName;
    }

     public String getCaption()  {
         return caption;
    }

      public void setCaption(String caption)  {
         this .caption = caption;
    }

     private static void copy(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);
    }

    @Override
     public String execute()      {
        imageFileName = new Date().getTime() + getExtention(fileName);
        File imageFile = new File(ServletActionContext.getServletContext().getRealPath( " /UploadImages " ) + " / " + imageFileName);
        copy(myFile, imageFile);
         return SUCCESS;
    }

} 清单3 tutorial/FileUploadAction.java
在FileUploadAction中我分别写了setMyFileContentType、setMyFileFileName、setMyFile和setCaption四个Setter方法，后两者很容易明白，分别对应FileUpload.jsp中的<s:file/>和<s:textfield/>标志。但是前两者并没有显式地与任何的页面标志绑定，那么它们的值又是从何而来的呢？其实，<s:file/>标志不仅仅是绑定到myFile，还有myFileContentType（上传文件的MIME类型）和myFileFileName（上传文件的文件名，该文件名不包括文件的路径）。因此，<s:file name="xxx" />对应Action类里面的xxx、xxxContentType和xxxFileName三个属性。FileUploadAction作用是将浏览器上传的文件拷贝到WEB应用程序的UploadImages文件夹下，新文件的名称是由系统时间与上传文件的后缀组成，该名称将被赋给imageFileName属性，以便上传成功的跳转页面使用。下面我们就来看看上传成功的页面：<% @ page language = " java " contentType = " text/html; charset=utf-8 " pageEncoding = " utf-8 " %>
<% @ taglib prefix = " s " uri = " /struts-tags " %> <! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
< html xmlns ="http://www.w3.org/1999/xhtml" >
< head >
    < title > Struts 2 File Upload </ title >
</ head >
< body >
    < div style ="padding: 3px; border: solid 1px #cccccc; text-align: center" >
        < img src ='UploadImages/<s:property value ="imageFileName" /> ' />
        < br />
        < s:property value ="caption" />
    </ div >
</ body >
</ html > 清单4 ShowUpload.jsp
ShowUpload.jsp获得imageFileName，将其UploadImages组成URL，从而将上传的图像显示出来。然后是Action的配置文件：<? xml version="1.0" encoding="UTF-8" ?> <! DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd" > < struts >
    < package name ="fileUploadDemo" extends ="struts-default" >
        < action name ="fileUpload" class ="tutorial.FileUploadAction" >
            < interceptor-ref name ="fileUploadStack" />
            < result name ="success" > /ShowUpload.jsp </ result >
        </ action >
    </ package >
</ struts > 清单5 struts.xml
fileUpload Action显式地应用fileUploadStack的拦截器。最后是web.xml配置文件：<? xml version="1.0" encoding="UTF-8" ?>
< web-app id ="WebApp_9" version ="2.4"
    xmlns ="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation ="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" >     < display-name > Struts 2 Fileupload </ display-name >     < filter >
        < filter-name > struts-cleanup </ filter-name >
        < filter-class >
            org.apache.struts2.dispatcher.ActionContextCleanUp
        </ filter-class >
    </ filter >

    < filter >
        < filter-name > struts2 </ filter-name >
        < filter-class >
            org.apache.struts2.dispatcher.FilterDispatcher
        </ filter-class >
    </ filter >

    < filter-mapping >
        < filter-name > struts-cleanup </ filter-name >
        < url-pattern > /* </ url-pattern >
    </ filter-mapping >     < filter-mapping >
        < filter-name > struts2 </ filter-name >
        < url-pattern > /* </ url-pattern >
    </ filter-mapping >     < welcome-file-list >
        < welcome-file > index.html </ welcome-file >
    </ welcome-file-list > </ web-app > 清单6 WEB-INF/web.xml

发布运行应用程序，在浏览器地址栏中键入：http://localhost:8080/Struts2_Fileupload/FileUpload.jsp，出现图示页面：
清单7 FileUpload页面选择图片文件，填写Caption并按下Submit按钮提交，出现图示页面：
清单8 上传成功页面更多配置
在运行上述例子，如果您留心一点的话，应该会发现服务器控制台有如下输出：Mar 20 , 2007 4 : 08 : 43 PM org.apache.struts2.dispatcher.Dispatcher getSaveDir
INFO: Unable to find 'struts.multipart.saveDir' property setting. Defaulting to javax.servlet.context.tempdir
Mar 20 , 2007 4 : 08 : 43 PM org.apache.struts2.interceptor.FileUploadInterceptor intercept
INFO: Removing file myFile C:\Program Files\Tomcat 5.5 \work\Catalina\localhost\Struts2_Fileupload\upload_251447c2_1116e355841__7ff7_00000006.tmp 清单9 服务器控制台输出
上述信息告诉我们，struts.multipart.saveDir没有配置。struts.multipart.saveDir用于指定存放临时文件的文件夹，该配置写在struts.properties文件中。例如，如果在struts.properties文件加入如下代码：struts.multipart.saveDir = /tmp 清单10 struts配置
这样上传的文件就会临时保存到你根目录下的tmp文件夹中（一般为c:\tmp），如果此文件夹不存在，Struts 2会自动创建一个。错误处理
上述例子实现的图片上传的功能，所以应该阻止用户上传非图片类型的文件。在Struts 2中如何实现这点呢？其实这也很简单，对上述例子作如下修改即可。首先修改FileUpload.jsp，在<body>与<s:form>之间加入“<s:fielderror />”，用于在页面上输出错误信息。然后修改struts.xml文件，将Action fileUpload的定义改为如下所示：        < action name ="fileUpload" class ="tutorial.FileUploadAction" >
            < interceptor-ref name ="fileUpload" >
                < param name ="allowedTypes" >
                    image/bmp,image/png,image/gif,image/jpeg
                </ param >
            </ interceptor-ref >
            < interceptor-ref name ="defaultStack" />
            < result name ="input" > /FileUpload.jsp </ result >
            < result name ="success" > /ShowUpload.jsp </ result >
        </ action > 清单11 修改后的配置文件
显而易见，起作用就是fileUpload拦截器的allowTypes参数。另外，配置还引入defaultStack它会帮我们添加验证等功能，所以在出错之后会跳转到名称为“input”的结果，也即是FileUpload.jsp。发布运行应用程序，出错时，页面如下图所示：
清单12 出错提示页面上面的出错提示是Struts 2默认的，大多数情况下，我们都需要自定义和国际化这些信息。通过在全局的国际资源文件中加入“struts.messages.error.content.type.not.allowed=The file you uploaded is not a image”，可以实现以上提及的需求。对此有疑问的朋友可以参考我之前的文章《在Struts 2.0中国际化(i18n)您的应用程序》。实现之后的出错页面如下图所示：
清单13 自定义出错提示页面同样的做法，你可以使用参数“maximumSize”来限制上传文件的大小，它对应的字符资源名为：“struts.messages.error.file.too.large”。字符资源“struts.messages.error.uploading”用提示一般的上传出错信息。多文件上传
与单文件上传相似，Struts 2实现多文件上传也很简单。你可以将多个<s:file />绑定Action的数组或列表。如下例所示。< s:form action ="doMultipleUploadUsingList" method ="POST" enctype ="multipart/form-data" >
    < s:file label ="File (1)" name ="upload" />
    < s:file label ="File (2)" name ="upload" />
    < s:file label ="FIle (3)" name ="upload" />
    < s:submit />
</ s:form > 清单14 多文件上传JSP代码片段
如果你希望绑定到数组，Action的代码应类似：     private File[] uploads;
     private String[] uploadFileNames;
     private String[] uploadContentTypes;     public File[] getUpload()  { return this .uploads; }
      public void setUpload(File[] upload)  { this .uploads = upload; }

      public String[] getUploadFileName()  { return this .uploadFileNames; }
      public void setUploadFileName(String[] uploadFileName)  { this .uploadFileNames = uploadFileName; }

      public String[] getUploadContentType()  { return this .uploadContentTypes; }
      public void setUploadContentType(String[] uploadContentType)  { this .uploadContentTypes = uploadContentType; } 清单15 多文件上传数组绑定Action代码片段
如果你想绑定到列表，则应类似：     private List < File > uploads = new ArrayList < File > ();
     private List < String > uploadFileNames = new ArrayList < String > ();
     private List < String > uploadContentTypes = new ArrayList < String > ();     public List < File > getUpload()  {
         return this .uploads;
    }
      public void setUpload(List < File > uploads)  {
         this .uploads = uploads;
    }

      public List < String > getUploadFileName()  {
         return this .uploadFileNames;
    }
      public void setUploadFileName(List < String > uploadFileNames)  {
         this .uploadFileNames = uploadFileNames;
    }

      public List < String > getUploadContentType()  {
         return this .uploadContentTypes;
    }
      public void setUploadContentType(List < String > contentTypes)  {
         this .uploadContentTypes = contentTypes;
    } 清单16 多文件上传列表绑定Action代码片段

调试易

上传任意多个文件？？？？

解决方案 »