用Struts上传多个文件的方法-技术开发专区

用Struts上传多个文件的方法

作者：佚名编辑： ITPUB实习编辑 2006-11-12 23:13

【IT168技术文档】
建立ActionForm

package com.cnehu.struts.form;
import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.upload.FormFile;
import org.apache.struts.upload.MultipartRequestHandler;

/**//**
 *
 * Title:UpLoadForm
 *
 *
 * Copyright: Copyright (c) 2005 techyang ;http://blog.csdn.net/techyang
 *
 * @author techyang
 * @version 1.0
 */

public class UpLoadForm extends ActionForm
...{
    public static final String ERROR_PROPERTY_MAX_LENGTH_EXCEEDED = 
       "org.apache.struts.webapp.upload.MaxLengthExceeded";

    protected FormFile theFile;
    protected FormFile theFile2;
    public FormFile getTheFile()
    ...{
        return theFile;
    }

    public void setTheFile(FormFile theFile)
    ...{
        this.theFile = theFile;
    }

    public ActionErrors validate(ActionMapping mapping,
            HttpServletRequest request)
    ...{
        ActionErrors errors = null;
        //has the maximum length been exceeded?
        Boolean maxLengthExceeded = (Boolean) request
                .getAttribute(MultipartRequestHandler.ATTRIBUTE_MAX_LENGTH_EXCEEDED);
        if ((maxLengthExceeded != null) && (maxLengthExceeded.booleanValue()))
        ...{
            errors = new ActionErrors();
            errors.add(ERROR_PROPERTY_MAX_LENGTH_EXCEEDED, new ActionError(
                    "maxLengthExceeded"));
        }
        return errors;

    }
    /**//**
     * @return Returns the theFile2.
     */
    public FormFile getTheFile2()
    ...{
        return theFile2;
    }
    /**//**
     * @param theFile2 The theFile2 to set.
     */
    public void setTheFile2(FormFile theFile2)
    ...{
        this.theFile2 = theFile2;
    }
}

建立ActionServlet

package com.cnehu.struts.action;

import java.io.*;
import javax.servlet.http.*;
import org.apache.struts.action.*;
import org.apache.struts.upload.FormFile;

import com.cnehu.struts.form.UpLoadForm;

/**//**
 *
 * Title:UpLoadAction
 *
 * Copyright: Copyright (c) 2005 techyang ;http://blog.csdn.net/techyang
 *
 * @author techyang
 * @version 1.0
 */

 public class UpLoadAction extends Action
...{
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception
    ...{
            String encoding = request.getCharacterEncoding();
            if ((encoding != null) && (encoding.equalsIgnoreCase("utf-8")))
            ...{
                response.setContentType("text/html; charset=gb2312");
                //如果没有指定编码，编码格式为gb2312
            }
            UpLoadForm theForm = (UpLoadForm) form;
            FormFile file = theForm.getTheFile();//取得上传的文件

            FormFile file2=theForm.getTheFile2();
            try
            ...{
                /**//*
                 * 取当前系统路径D:Tomcat5webappscoka 其中coka 为当前context
                 */
                String filePath = this.getServlet().getServletContext()
                .getRealPath("/");
                InputStream stream = file.getInputStream();//把文件读入

                ByteArrayOutputStream baos = new ByteArrayOutputStream();

                /**//*
                 * 建立一个上传文件的输出流 如果是linux系统请把UploadFiles后的"\"换成"/"
                 */
                OutputStream bos = new FileOutputStream(filePath +
                        "UploadFiles\"+file.getFileName());

                //D:Tomcat5webappscokaUploadFilesDSC01508.JPG
              /**//*  System.out.println(filePath +
                        "UploadFiles\"+file.getFileName());
                System.out.println(filePath);*/
                request.setAttribute("fileName",filePath + "/"
                        + file.getFileName());
                int bytesRead = 0;
                byte[] buffer = new byte[8192];
                while ((bytesRead = stream.read(buffer, 0, 8192)) != -1)
                ...{
                    bos.write(buffer, 0, bytesRead);//将文件写入服务器
                }
                bos.close();
                stream.close();

InputStream stream2 = file2.getInputStream();//把文件读入
                ByteArrayOutputStream baos2 = new ByteArrayOutputStream();
                OutputStream bos2 =  new FileOutputStream(filePath +
                        "UploadFiles\"+file2.getFileName());//建立一个上传文件的输出流
                int bytesRead2 = 0;
                byte[] buffer2 = new byte[8192];
                int i=0;
                while ((bytesRead2 = stream2.read(buffer2, 0, 8192)) != -1)
                ...{
                    bos2.write(buffer2, 0, bytesRead2);//将文件写入服务器
                }
                bos2.close();
                stream2.close();

            } catch (Exception e)
            ...{
                System.err.print(e);
            }
            return mapping.findForward("display");

    }
}

【IT168技术文档】
建立上传用的JSP文件 upload.jsp

<%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html" %>
<html:html>
<head>
<title>用Struts上传文件</title>
</head>
<body>
<html:form action="/uploadsAction" enctype="multipart/form-data">
<html:file property="theFile"/>
<html:file property="theFile2"/>

<html:submit/>
</html:form>
</body>
</html:html>

配置struts-config.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-
  //Apache Software Foundation//DTD Struts Configuration 1.1//EN" 
   "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
<struts-config>
   <data-sources />
   <form-beans >
     <form-bean name="uploadsForm" type="com.cnehu.struts.form.UpLoadForm" />
   </form-beans>

   <global-exceptions />
   <global-forwards >

   </global-forwards>

   <action-mappings >

      <action name="uploadsForm" type="com.cnehu.struts.action.UpLoadAction" 
        path="/uploadsAction">
 <forward name="display" path="/display.jsp" />
 </action>
    </action-mappings>

</struts-config>

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