Struts文件下传方法

Struts文件上传方法

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.javapackage 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.javapackage 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>