UploadController

package com.imenger.richlink.controller;

import com.fasterxml.jackson.databind.objectMapper;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * @author lvyimeng
 * @version V1.0
 * @title: richlink
 * @Description: 上传
 * @date: 2018/10/9 18:38
 */
@Controller
public class UploadController {

    private static final objectMapper objectMapper = new objectMapper（）;
    private PrintWriter writer = null;

    @RequestMapping（value = “fileUpload“ method = RequestMethod.POST）
    public void fileUpload（MultipartHttpServletRequest request
                           HttpServletResponse response） throws ServletException IOException
            FileUploadException {
        ServletContext application = request.getSession（）.getServletContext（）;
        String savePath = application.getRealPath（“/“） + “attached/“;

        // 文件保存目录URL
        String saveUrl = request.getContextPath（） + “/attached/“;

        // 定义允许上传的文件扩展名
        HashMap extMap = new HashMap（）;
        extMap.put（“image“ “gifjpgjpegpngbmp“）;
        extMap.put（“flash“ “swfflv“）;
        extMap.put（“media“ “swfflvmp3wavwmawmvmidavimpgasfrmrmvb“）;
        extMap.put（“file“ “docdocxxlsxlsxppthtmhtmltxtziprargzbz2“）;

        // 最大文件大小
        long maxSize = 1000000;

        response.reset（）;
        response.setCharacterEncoding（“UTF-8“）;
        response.setContentType（“text/html“）;
        writer = response.getWriter（）;
        // writer.println（json）;  //想办法把map转成json

        if （!ServletFileUpload.isMultipartContent（request）） {
            writer.println（objectMapper.writeValueAsString（getError（“请选择文件。“）））;
            return;

        }
        // 检查目录
        File uploadDir = new File（savePath）;
        if （!uploadDir.isDirectory（）） {
            writer.println（objectMapper.writeValueAsString（getError（“上传目录不存在。“）））;
            return;
        }
        // 检查目录写权限
        if （!uploadDir.canWrite（）） {
            writer.println（objectMapper.writeValueAsString（getError（“上传目录没有写权限。“）））;
            return;
        }

        String dirName = request.getParameter（“dir“）;
        if （dirName == null） {
            dirName = “image“;