SpringMVC ajax技术无刷新文件上传下载删除示例

参考

Spring MVC中上传文件实例

SpringMVC结合ajaxfileupload.js实现ajax无刷新文件上传

Spring MVC 文件上传下载 （FileOperateUtil.java 压缩，重命名工具类）

controller代码

@Controller
@RequestMapping(value = "/file")
public class FileController extends BaseController {
    /**
     * 上传文件
     *
     * @return JSON
     * @throws Exception
     */
    @ResponseBody
    @RequestMapping(value = "/upload")
    public Message upload(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        logBefore(logger, "上传文件");

        Message message = new Message();
        PageData pd = new PageData();
        pd = this.getPageData();

        // 这里实现文件上传操作用的是commons.io.FileUtils类,它会自动判断/upload是否存在,不存在会自动创建
        String realPath = request.getSession().getServletContext() .getRealPath("/upload/file");
        logBefore(logger, "realPath: " + realPath);
        
        // 上传文件的原名(即上传前的文件名字)
        String originalFilename = null;
        // 如果只是上传一个文件,则只需要MultipartFile类型接收文件即可,而且无需显式指定@RequestParam注解
        // 如果想上传多个文件,那么这里就要用MultipartFile[]类型来接收文件,并且要指定@RequestParam注解
        // 上传多个文件时,前台表单中的所有<input
        // type="file"/>的name都应该是file,否则参数里的file无法获取到所有上传的文件
        MultipartFile file = FileUpload.getMultipartFileByName(request, "file");
        if (file.isEmpty()) {
            message.response = ResponseStatus.FAILED.getStatus();
            message.message = "请选择文件后上传!";
        } else {
            originalFilename = file.getOriginalFilename();
            logBefore(logger, "文件原名: " + originalFilename);
            logBefore(logger, "文件名称: " + file.getName());
            logBefore(logger, "文件长度: " + file.getSize());
            logBefore(logger, "文件类型: " + file.getContentType());
            logBefore(logger, "========================================");
            try {
                // 这里不必处理IO流关闭的问题,因为FileUtils.copyInputStreamToFile()方法内部会自动把用到的IO流关掉
                // 此处也可以使用Spring提供的MultipartFile.transferTo(File dest)方法实现文件的上传
                FileUtils.copyInputStreamToFile(file.getInputStream(), new File(realPath, originalFilename));
            } catch (IOException e) {
                logBefore(logger, "文件[" + originalFilename + "]上传失败,堆栈轨迹如下");
                e.printStackTrace();
                message.response = ResponseStatus.FAILED.getStatus();
                message.message = "出错，服务器繁忙，请稍后再试。";
            }

        }
        //System.out.println(request.getContextPath() + "/upload/" + originalFilename);
        message.response = ResponseStatus.SUCCESS.getStatus();
        message.message = "上传成功！";

        return message;
    }

    /**
     * 单条记录删除
     *
     * @return JSON
     * @throws Exception
     */
    @ResponseBody
    @RequestMapping(value = "/delete")
    public Message delete() {
        logBefore(logger, "删除文件");
        PageData pd = new PageData();
        Message message = new Message();
        String file_id = (String) pd.get("file_id");
        // 获取对应文件名和地址
        String filePath = "";
        //TODO:删除本地文件，删除数据库记录
        try {
            pd = this.getPageData();
            AccidentService.delete(pd);
            message.response = ResponseStatus.SUCCESS.getStatus();
            message.message = "删除成功";
        } catch (Exception e) {
            logger.error(e.toString(), e);
            message.response = ResponseStatus.FAILED.getStatus();
            message.message = "出错，服务器繁忙，请稍后再试。";
        }
        return message;
    }

    /**
     * 获取数据列表页
     *
     * @param page
     *            页面请求对象
     * @return 跳转页面
     */
    @RequestMapping(value = "/list")
    public ModelAndView list(HttpServletRequest request, Page page) {
        logBefore(logger, "列表File");
        // if(!Jurisdiction.buttonJurisdiction(menuUrl, "cha")){return null;}
        // //校验权限
        ModelAndView mv = this.getModelAndView();
        PageData pd = new PageData();
        //文件储存地址
        //String realPath = request.getSession().getServletContext() .getRealPath("/upload/file");
        //TODO：获取数据库文件信息
        try {
            pd = this.getPageData();
            mv.setViewName("security/files/file_list");
            mv.addObject(Const.SESSION_QX, this.getHC()); // 按钮权限
        } catch (Exception e) {
            logger.error(e.toString(), e);
        }
        return mv;
    }

    /**
     * 下载文件
     *
     * @param page
     *            页面请求对象
     * @return 跳转页面
     * @throws IOException
     */
    @RequestMapping(value = "/download")
    public ResponseEntity<byte[]> download(HttpServletRequest request,
            HttpServletResponse response, Page page) throws IOException {
        logBefore(logger, "下载File");
        PageData pd = new PageData();
        String file_id = (String) pd.get("file_id");
        // 获取对应文件名和地址
        String fileName = "1.1.1关于印发《交运集团2016年安全生产工作意见》的通知.doc";
        // fileName = "222";
        String filePath = request.getServletContext().getRealPath(
                "/upload/file")
                + "\1.doc";
        logBefore(logger, "fileName: " + fileName);
        logBefore(logger, "filePath: " + filePath);
        File file = new File(filePath);
        try {
            fileName = new String(fileName.getBytes("UTF-8"), "iso-8859-1");// 为了解决中文名称乱码问题
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        // 下载文件
        HttpHeaders headers = new HttpHeaders();
        headers.setContentDispositionFormData("attachment", fileName);
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);

        try {
            return new ResponseEntity<byte[]>(
                    FileUtils.readFileToByteArray(file), headers,
                    HttpStatus.CREATED);
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

}

其中一个FileUpload类的代码

package com.jiaoyun.util;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.io.FileUtils;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;


/**
 * 上传文件 创建人：James 创建时间：2014年12月23日
 * 
 * @version
 */
public class FileUpload {

    /**
     * @param file
     *            //文件对象
     * @param filePath
     *            //上传路径
     * @param fileName
     *            //文件名
     * @return 文件名
     */
    public static String fileUp(MultipartFile file, String filePath, String fileName) {
        String extName = ""; // 扩展名格式：
        try {
            if (file.getOriginalFilename().lastIndexOf(".") >= 0) {
                extName = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
            }
            copyFile(file.getInputStream(), filePath, fileName + extName).replaceAll("-", "");
        } catch (IOException e) {
            System.out.println(e);
        }
        return fileName + extName;
    }

    /**
     * 写文件到当前目录的upload目录中
     * 
     * @param in
     * @param fileName
     * @throws IOException
     */
    private static String copyFile(InputStream in, String dir, String realName) throws IOException {
        File file = new File(dir, realName);
        if (!file.exists()) {
            if (!file.getParentFile().exists()) {
                file.getParentFile().mkdirs();
            }
            file.createNewFile();
        }
        System.out.println(file.getAbsolutePath());
        FileUtils.copyInputStreamToFile(in, file);
        return realName;
    }

    /**
     * @param request
     *            //requst请求
     * @param filePath
     *            //上传路径
     * @param fileName
     *            //文件名
     * @return 文件名
     * @throws IOException
     * @throws IllegalStateException
     */
    public static String upload(HttpServletRequest request, String filePath, String fileName)
            throws IllegalStateException, IOException {
        String extName = ""; // 扩展名格式：
        String path = "";
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                request.getSession().getServletContext());
        // 判断 request 是否有文件上传,即多部分请求
        if (multipartResolver.isMultipart(request)) {
            // 转换成多部分request
            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
            // 取得request中的所有文件名
            Iterator<String> iter = multiRequest.getFileNames();
            while (iter.hasNext()) {
                // 取得上传文件
                MultipartFile file = multiRequest.getFile(iter.next());
                if (file != null) {
                    // 取得当前上传文件的文件名称
                    String myFileName = file.getOriginalFilename();
                    // 如果名称不为“”,说明该文件存在，否则说明该文件不存在
                    if (myFileName.trim() != "") {
                        // 重命名上传后的文件名
                        if (file.getOriginalFilename().lastIndexOf(".") >= 0) {
                            extName = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
                        }
                        // 定义上传路径
                        path = filePath + "/" + fileName + extName;
                        // System.out.println("---------------------");
                        // System.out.println(path);
                        // System.out.println("---------------------");
                        File localFile = new File(path);
                        file.transferTo(localFile);
                    }
                }
            }

        }
        return extName;
    }
    
    

    /**
     * @param request
     *            //requst请求
     * @param filePath
     *            //上传路径
     * @param fileName
     *            //文件名
     * @return 文件名
     * @throws IOException
     * @throws IllegalStateException
     */
    public static String[] uploadMultiple(HttpServletRequest request, String filePath, String[] fileName)
            throws IllegalStateException, IOException {
        String[] extName = new String[fileName.length]; // 扩展名格式：
        String path = "";
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                request.getSession().getServletContext());
        // 判断 request 是否有文件上传,即多部分请求
        if (multipartResolver.isMultipart(request)) {
            // 转换成多部分request
            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
            // 取得request中的所有文件名
            Iterator<String> iter = multiRequest.getFileNames();
            int i = 0;
            while (iter.hasNext()) {
                // 取得上传文件
                MultipartFile file = multiRequest.getFile(iter.next());
                if (file != null) {
                    // 取得当前上传文件的文件名称
                    String myFileName = file.getOriginalFilename();
                    // 如果名称不为“”,说明该文件存在，否则说明该文件不存在
                    if (myFileName.trim() != "") {
                        // 重命名上传后的文件名
                        if (file.getOriginalFilename().lastIndexOf(".") >= 0) {
                            extName[i] = file.getOriginalFilename()
                                    .substring(file.getOriginalFilename().lastIndexOf("."));
                        }
                        // 定义上传路径
                        fileName[i] = fileName[i].replace(extName[i], "");
                        path = filePath + "/" + fileName[i] + extName[i];
//                        path = fileName[i] + extName[i];
                        File localFile = new File(path);
                        file.transferTo(localFile);
                        System.out.println(localFile.getAbsolutePath());
                    }
                }
                i++;
            }

        }
        return extName;
    }

    /**
     * 从request那里得到所有MultipartFile
     */
    public static List<MultipartFile> getMultipartFileFromRequest(HttpServletRequest request)
            throws IllegalStateException, IOException {
        
        List<MultipartFile> fileList = new ArrayList<MultipartFile>();
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                request.getSession().getServletContext());
        // 判断 request 是否有文件上传,即多部分请求
        if (multipartResolver.isMultipart(request)) {
            // 转换成多部分request
            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
            // 取得request中的所有文件名
            Iterator<String> iter = multiRequest.getFileNames();
            while (iter.hasNext()) {
                MultipartFile file = multiRequest.getFile(iter.next());
                System.out.println(file.getName()+"11111111111");
                if (file != null && file.getSize() > 0) {
                    fileList.add(file);
                }
            }
        }
        return fileList;
    }
    /**
     * @Description:删除文件
     */
    public static void deleteFile(String bucketName, String key) {
        return;
    }
    public static void deleteFile(String bucketName) {
        return;
    }
    
    /**
     * 从request那里得到所有MultipartFile
     */
    public static MultipartFile getMultipartFileByName(HttpServletRequest request,String name)
            throws Exception {
        MultipartFile file=null;
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                request.getSession().getServletContext());
        // 判断 request 是否有文件上传,即多部分请求
        if (multipartResolver.isMultipart(request)) {
            // 转换成多部分request
            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
            // 取得request中的所有文件名
            Iterator<String> iter = multiRequest.getFileNames();
            while (iter.hasNext()) {
                file = multiRequest.getFile(iter.next());
                if (file != null&&file.getName().equals(name)) {
                    return file;
                }
            }
        }
        return file;
    }
    
    /**
     * 根据文件得到后缀名
     * @param file
     * @return
     */
    public static String getExtNameByString(String file){
        String extName="";
        if (file.lastIndexOf(".") >= 0){
            extName = file.substring(file.lastIndexOf("."));
        }
        return extName;
    }
    
    public static String getExtName(MultipartFile file){
        String extName="";
        if (file.getOriginalFilename().lastIndexOf(".") >= 0){
            extName = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
        }
        return extName;
    }


}

---

html前台页面代码

上传按钮

<a class="btn red btn-circle btn-sm"
                        href="javascript:importData('file/upload');"> 上传文件 <i
                        class="fa fa-upload"></i>
                    </a>
                    <script>
                                    function importData(url) {
                                        dialog =    bootbox.confirm({
                                            title : '请选择文件',
                                            message : '<form id="uploadFileForm" class="form-horizontal"><input type="file" name="file" value="选择文件" id="uploadFileInput" class="btn sbold green"/></form>',
                                            buttons: {
                                                confirm: {
                                                    label: '上传',
                                                    className: 'btn-success'
                                                },
                                                cancel: {
                                                    label: '取消',
                                                    className: 'btn-danger'
                                                }
                                            },
                                            callback: function (result) {
                                                if(result){
                                                    var formData = new FormData($( "#uploadFileForm" )[0]); 
                                                    $.ajax({
                                                        type: "POST",
                                                        url: url,
                                                          data: formData,
                                                        dataType:'json',
                                                        async: false,  
                                                        cache: false,  
                                                        contentType: false,  //必须false才会自动加上正确的Content-Type
                                                        processData: false,  //必须false才会避开jQuery对 formdata 的默认处理
                                                        error: function(request) {
                                                            bootbox.alert("网络异常");
                                                          },
                                                        success: function(data){
                                                        　　    if (data.response == 'true') {
                                                        　　        bootbox.alert("上传成功!");
                                                                $table.bootstrapTable('refresh');
                                                                dialog.modal('hide');
                                                        　　　　} else {
                                                        　　　　    bootbox.alert(data.message);
                                                        　　　　}
                                                        }
                                                    });
                                                }
                                            }
                                        }); 
                                    }
                                    </script>

下载按钮

<a class="btn default" id="demo_1"
                        href="file/download?file_id=1" target="_blank"> 下载文件 <i
                            class="fa fa-download"></i>
                    </a>

删除按钮

<a class="btn red" id="demo_1" href="file/delete?file_id=1"> 删除文件 <i class="fa fa-remove"></i>
                    </a>