Struts文件上传

最近在网上看了几篇关于Struts处理文件上传的文章，并进行了整理。但对其中一些问题还是有些迷惑，以待日后解决！

       现把代码贴出来以供初学者研究：

 

UploadUitl.java

 

/**  * 这是一个辅助类，辅助完成上传功能。  * 可以选择将文件保存在数据库里或保存在文件系统上  * 并对文件的类型和大小进行了限制  */ package com.hywavesoft.struts.commons; import java.io.*; public class UploadUtil {     private static final String DATABASE_DEST = "database";     private static final String FILE_DEST = "file";     private static final int MAX_SIZE = 1024 * 1024; private static final String[] TYPES = { ".jpg", ".gif", ".zip", ".rar" };       public static void saveFile(String fileName, byte[] fileData, int size,             String dest) throws FileNotFoundException, IOException {         if (!checkSize(size)) {             throw new IOException(size + " is too large !");         }         if (!checkType(fileName)) {             throw new IOException("Unvaildate type !");         }         if (dest.equals(DATABASE_DEST)) {             saveToDb(fileName, fileData);         }         if (dest.equals(FILE_DEST)) {             saveToFile(fileName, fileData);         }     }       private static void saveToDb(String fileName, byte[] fileData) {     }       private static void saveToFile(String fileName, byte[] fileData)             throws FileNotFoundException, IOException {         OutputStream o = new FileOutputStream(fileName);         o.write(fileData);         o.close();     }       public static void delFile(String fileName, String dest)             throws NullPointerException, SecurityException {         if (dest.equals(DATABASE_DEST)) {             delFromDb(fileName);         }         if (dest.equals(FILE_DEST)) {             delFromFile(fileName);         }     }       private static void delFromDb(String fileName) {     }       private static void delFromFile(String fileName)             throws NullPointerException, SecurityException {         File file = new File(fileName);         if (file.exists())             file.delete();     }       private static boolean checkSize(int size) {         if (size > MAX_SIZE)             return false;         return true;     }       private static boolean checkType(String fileName) {         for (int i = 0; i < TYPES.length; i++) {             if (fileName.toLowerCase().endsWith(TYPES[i])) {                 return true;             }         }         return false;     }   }

 

UploadAction.java

 

/**  * org.apache.struts.upload.FormFile是Struts处理文件上传的核心组件，提供了获得  * 上传文件元数据的方法。  */ package com.hywavesoft.struts.upload; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.upload.FormFile; import com.hywavesoft.struts.commons.UploadUtil;   public class UploadAction extends BaseAction {     public ActionForward execute(         ActionMapping mapping,         ActionForm form,         HttpServletRequest request,         HttpServletResponse response) throws Exception {         UploadForm uploadForm = (UploadForm) form;                 FormFile file = uploadForm.getTheFile();              String contentType = file.getContentType();         String fileName = file.getFileName();         int fileSize = file.getFileSize();         byte[] fileDate = file.getFileData();                    String command = request.getParameter("command");                 if (command.equals(SAVE)){             UploadUtil.saveFile(getPath("fileUpload")+fileName ,fileDate,fileSize,FILE_DEST);         }               if (command.equals(DELETE)){             UploadUtil.delFile(fileName,FILE_DEST);         }         file.destroy();         return mapping.findForward("success");     } }

 

BaseAction.java

 

package com.hywavesoft.struts.upload; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping;   public abstract class BaseAction extends Action {     protected static final String SAVE = "save";     protected static final String DELETE = "delete";     protected static final String DATABASE_DEST = "database";     protected static final String FILE_DEST = "file";     public abstract ActionForward execute(         ActionMapping mapping,         ActionForm form,         HttpServletRequest request,         HttpServletResponse response) throws Exception;       public String getPath(String filePath){         String path = getServlet().getServletContext().getRealPath(filePath) + "//";         return path;     } }

 

UploadForm.java

 

package com.hywavesoft.struts.upload; import org.apache.struts.action.ActionForm; import org.apache.struts.upload.FormFile;   public class UploadForm extends ActionForm {     private FormFile theFile;     public FormFile getTheFile() {         return theFile;     }     public void setTheFile(FormFile theFile) {         this.theFile = theFile;     } }

 

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>    <data-sources />    <form-beans >       <form-bean name="uploadForm" type="com.hywavesoft.struts.upload.UploadForm" />      </form-beans>      <global-exceptions />    <global-forwards />    <action-mappings >       <action          attribute="uploadForm"          input="/upload/upload.jsp"          name="uploadForm"          path="/upload"          scope="request"          type="com.hywavesoft.struts.upload.UploadAction">          <forward name="success" path="/upload/success.jsp" />       </action>      </action-mappings>      <message-resources parameter="com.hywavesoft.struts.ApplicationResources" /> </struts-config>

 

Upload.jsp

 

<%@pagelanguage="java"%> <%@tagliburi="http://jakarta.apache.org/struts/tags-bean"prefix="bean"%> <%@tagliburi="http://jakarta.apache.org/struts/tags-html"prefix="html"%> <html>     <head>         <title>JSP for uploadForm form</title>     </head>     <body>         <html:form action="/upload" method="post" enctype="multipart/form-data">             theFile : <html:file property="theFile"/><html:errors property="theFile"/><br/>             <html:submit/><html:cancel/>             <html:hidden property="command" value="save"/>         </html:form>     </body> </html>

 

Success.jsp

 

<%@pagelanguage="java"%> <%@tagliburi="http://struts.apache.org/tags-bean"prefix="bean"%> <%@tagliburi="http://struts.apache.org/tags-html"prefix="html"%> <%@tagliburi="http://struts.apache.org/tags-logic"prefix="logic"%> <%@tagliburi="http://struts.apache.org/tags-tiles"prefix="tiles"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html:html locale="true">  <head>     <html:base />     <title>success.jsp</title>     <meta http-equiv="pragma" content="no-cache">     <meta http-equiv="cache-control" content="no-cache">     <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">     <meta http-equiv="description" content="This is my page">  </head>  <body> <P class=MsoNormal style="MARGIN: 0cm 0cm