SpringMVC文件上传的实现+文件上传工具类设计

1. 修改Spring的配置文件，添加辅助jar包

        <!-- 文件上传需要的jar包 -->        <dependency>            <groupId>commons-fileupload</groupId>            <artifactId>commons-fileupload</artifactId>            <version>1.2.1</version>        </dependency>        <dependency>            <groupId>commons-io</groupId>            <artifactId>commons-io</artifactId>            <version>1.4</version>        </dependency>

<!-- Spring文件上传表单的视图解析器 --><bean id="multipartResolver"  class="org.springframework.web.multipart.commons.CommonsMultipartResolver">          <property name="defaultEncoding" value="UTF-8" />        <!--上传限制为200M  -->        <property name="maxUploadSize" value="209715200" /></bean>  

2. 前端form表单设置：必须设置 enctype=”multipart/form-data”

<form id="myForm" name="myForm" action="" method="post" enctype="multipart/form-data">

3. 后台处理工具类

package com.group.ssm.utils;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.UnsupportedEncodingException;import java.text.DecimalFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;import java.util.Map;import java.util.Random;import java.util.Set;import javax.servlet.http.HttpServletRequest;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItem;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import org.apache.commons.lang3.StringUtils;import org.apache.commons.lang3.time.DateFormatUtils;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.springframework.web.multipart.MultipartFile;import org.springframework.web.multipart.MultipartHttpServletRequest;import org.springframework.web.multipart.commons.CommonsMultipartFile;/** *  * @date 2017年9月6日  * @author lcx * @Description: 文件上传处理 */public class FileUploadUtils {    protected final Log log = LogFactory.getLog(getClass());    private static long maxFileSize = 200000000;// 默认限制为200M    private static String encoding = "utf-8";// 编码格式    private static List prepairedItems = null;    /**     * 得到文件路径     *      * @param fileNameWithPath     * @return     */    public static String getFilePath(String fileNameWithPath) {        String filePath = "";        fileNameWithPath = fileNameWithPath.replace("/", File.separator);        int idx = fileNameWithPath.lastIndexOf(File.separator);        if (idx != -1) {            filePath = fileNameWithPath.substring(0, idx);        }        return filePath;    }    /**     * 将内容写入文件     * @param context 内容     * @param fileName 目标文件     * @throws Exception     */    public static void writeFile(String context,String fileName) throws Exception{        byte[] bytes=context.getBytes();        File file=new File(fileName);        FileOutputStream fop = new FileOutputStream(file);        BufferedOutputStream out = new BufferedOutputStream(fop);        if(!file.exists()){            file.mkdirs();        }        out.write(bytes);        out.flush();        out.close();    }    /**     * 复制文件     *      * @param srcFileName     *            要复制的源文件     * @param destFileName     *            目标文件     * @throws Exception     */    public static void copyFile(String srcFileName, String destFileName)            throws Exception {        BufferedInputStream in = null;        BufferedOutputStream out = null;        try {            in = new BufferedInputStream(new FileInputStream(new File(                    srcFileName)));            String destPath = getFilePath(destFileName);            File pathFile = new File(destPath);            if (!pathFile.exists()){                pathFile.mkdirs();            }            out = new BufferedOutputStream(new FileOutputStream(new File(                    destFileName)));            int len;            byte[] b = new byte[1024];            while ((len = in.read(b)) != -1) {                out.write(b, 0, len);            }            out.flush();        } catch (Exception e) {            System.out.println("复制文件失败：" + e.getMessage());            throw e;        } finally {            try {                if (in != null)                    in.close();            } catch (Exception ex) {            }            try {                if (out != null)                    out.close();            } catch (Exception ex) {            }        }    }    /**     *      * @param time 公文创建时间     * @param personID 创建用户id     * @param oldFileName 旧文件名称     * @return     * @throws Exception     * 返回文件名     * @author lcx     */    private static String getDocPath(long time,String personID,String oldFileName)throws Exception{        String affix="";        if(StringUtils.isNotEmpty(oldFileName) && oldFileName.lastIndexOf(".")>-1){            affix = oldFileName.substring(oldFileName.lastIndexOf("."));        }        return "doc$".concat(String.valueOf(time)).concat("$").concat(personID).concat("$").concat("newDoc")+affix;    }    /**     *      * @param request     * @param resourcePath 源文件地址     * @param savePath 保存地址     * @return     * 文件修改后上传保存，如果源文件不是空，则覆盖源文件，如果源文件为空，则创建新文件     * @author lcx     */    @SuppressWarnings("null")    public static boolean upload(HttpServletRequest request,String resourcePath,String savePath){        BufferedInputStream in = null;        BufferedOutputStream out = null;        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;          Map<String, MultipartFile> map = multipartRequest.getFileMap();        List<MultipartFile> fileList = new ArrayList<MultipartFile>();          Set<String> keys = map.keySet();         for (String key : keys) {            fileList.add(map.get(key));        }        String uploadMethod = request.getParameter("uploadMethod");        if (savePath == null || savePath.equals(""))            throw new RuntimeException("没有设置文件在服务器上的保存路径");        File savePathFile = new File(savePath);        if (!savePathFile.exists()) {            if (!savePathFile.mkdirs())                throw new RuntimeException("创建文件上传路径(" + savePath + ")失败");        }        boolean isMultipart = ServletFileUpload.isMultipartContent(request);// 检查表单中是否包含文件        DiskFileItemFactory fileItemFactory = new DiskFileItemFactory();        fileItemFactory.setSizeThreshold(4096);// 设置缓存临时文件的临界值        fileItemFactory.setRepository(savePathFile);        ServletFileUpload upload = new ServletFileUpload(fileItemFactory);        upload.setHeaderEncoding(encoding);        upload.setSizeMax(maxFileSize);        List items = null;        if(prepairedItems != null){            items = prepairedItems;        }else{                try {                    items =  ((ServletFileUpload) upload).parseRequest(request);                } catch (FileUploadException e) {                    e.printStackTrace();                }        }        for (int i = 0; i < fileList.size(); i++) {            CommonsMultipartFile  dfi = (CommonsMultipartFile ) fileList.get(i);            DiskFileItem fi = (DiskFileItem)dfi.getFileItem();            String srcFileName = dfi.getName().trim().replaceAll("\\s*", "");            try {                //输出到文件目录                fi.write(new File("D:\\111\\123"+i+".doc"));            } catch (Exception e) {                e.printStackTrace();            }            long fileSize = dfi.getSize();            double fitFileSize = 0;            String fileSizeStr = "";            DecimalFormat df = new DecimalFormat("#.00");            if((double)fileSize > (1024*1024)){                fitFileSize = (double)fileSize / (1024*1024);                fileSizeStr = df.format(fitFileSize) + "M";            }else{                fitFileSize = (double)fileSize / 1024;                if(fitFileSize < 1)                    fileSizeStr = "0" + df.format(fitFileSize) + "kb";                else                    fileSizeStr = df.format(fitFileSize) + "kb";            }            System.out.println("文件大小是："+fileSizeStr);        }        return false;    }}