Java文件上传组件 common-fileUpload 使用教程 - OPEN 开发经验库

package com.file.upload;

import java.io.File;

import java.util.Iterator;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.FileUploadException;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

import com.file.helper.FileConst;

import com.file.helper.ReadUploadFileType;

public class FileUpload {

     private static String uploadPath = null;// 上传文件的目录

     private static String tempPath = null; // 临时文件目录

     private static File uploadFile = null;

     private static File tempPathFile = null;

     private static int sizeThreshold = 1024;

     private static int sizeMax = 4194304;

     //初始化

     static{

           sizeMax  = Integer.parseInt(FileConst.getValue('sizeMax'));

           sizeThreshold = Integer.parseInt(FileConst.getValue('sizeThreshold'));

           uploadPath = FileConst.getValue('uploadPath');

           uploadFile = new File(uploadPath);

           if (!uploadFile.exists()) {

               uploadFile.mkdirs();

           }

           tempPath = FileConst.getValue('tempPath');

           tempPathFile = new File(tempPath);

           if (!tempPathFile.exists()) {

               tempPathFile.mkdirs();

           }

     }

    /**

     * 上传文件

     * @param request

     * @return true 上传成功 false上传失败

     */

    @SuppressWarnings('unchecked')

    public static boolean upload(HttpServletRequest request){

        boolean flag = true;

        //检查输入请求是否为multipart表单数据。

        boolean isMultipart = ServletFileUpload.isMultipartContent(request);

        //若果是的话

        if(isMultipart){

            /**为该请求创建一个DiskFileItemFactory对象，通过它来解析请求。执行解析后，所有的表单项目都保存在一个List中。**/

            try {

                DiskFileItemFactory factory = new DiskFileItemFactory();

                factory.setSizeThreshold(sizeThreshold); // 设置缓冲区大小，这里是4kb

                factory.setRepository(tempPathFile);// 设置缓冲区目录

                ServletFileUpload upload = new ServletFileUpload(factory);

                upload.setHeaderEncoding('UTF-8');//解决文件乱码问题

                upload.setSizeMax(sizeMax);// 设置最大文件尺寸

                List<FileItem> items = upload.parseRequest(request);

                // 检查是否符合上传的类型

                if(!checkFileType(items)) return false;

                Iterator<FileItem> itr = items.iterator();//所有的表单项

                //保存文件

                while (itr.hasNext()){

                     FileItem item = (FileItem) itr.next();//循环获得每个表单项

                     if (!item.isFormField()){//如果是文件类型

                             String name = item.getName();//获得文件名 包括路径啊

                             if(name!=null){

                                 File fullFile=new File(item.getName());

                                 File savedFile=new File(uploadPath,fullFile.getName());

                                 item.write(savedFile);

                             }

                     }

                }

            } catch (FileUploadException e) {

                flag = false;

                e.printStackTrace();

            }catch (Exception e) {

                flag = false;

                e.printStackTrace();

            }

        }else{

            flag = false;

            System.out.println('the enctype must be multipart/form-data');

        }

        return flag;

    }

     

    /**

     * 删除一组文件

     * @param filePath 文件路径数组

     */

    public static void deleteFile(String [] filePath){

        if(filePath!=null && filePath.length>0){

            for(String path:filePath){

                String realPath = uploadPath+path;

                File delfile = new File(realPath);

                if(delfile.exists()){

                    delfile.delete();

                }

            }

             

        }

    }

     

    /**

     * 删除单个文件

     * @param filePath 单个文件路径

     */

    public static void deleteFile(String filePath){

        if(filePath!=null && !''.equals(filePath)){

            String [] path = new String []{filePath};

            deleteFile(path);

        }

    }

     

    /**

     * 判断上传文件类型

     * @param items

     * @return

     */

    private static Boolean checkFileType(List<FileItem> items){

        Iterator<FileItem> itr = items.iterator();//所有的表单项

        while (itr.hasNext()){

             FileItem item = (FileItem) itr.next();//循环获得每个表单项

             if (!item.isFormField()){//如果是文件类型

                     String name = item.getName();//获得文件名 包括路径啊

                     if(name!=null){

                         File fullFile=new File(item.getName());

                         boolean isType = ReadUploadFileType.readUploadFileType(fullFile);

                         if(!isType) return false;

                         break;

                     }

             }

        }

         

        return true;

    }

}