src/main/java/com/hwua/erhai/controller/DoCarUpdateServlet.java

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package com.hwua.erhai.controller;

import com.google.common.base.Preconditions;
import com.hwua.erhai.entity.Car;
import com.hwua.erhai.service.ICarService;
import com.hwua.erhai.service.impl.MockCarService;
import com.hwua.erhai.service.query.QueryCondition;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.lang3.StringUtils;


import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@WebServlet(name = "DoCarUpdateServlet", value = "/doCarUpdate")
public class DoCarUpdateServlet extends HttpServlet {
    ICarService carService = new MockCarService();
    //上传文件存储目录
    private static final String UPLOAD_DIRECTORY = "upload";
    //上传配置
    private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3;//3MB
    private static final int MAX_FILE_SIZE = 1024 * 1024 * 40;//40MB
    private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50;//50MB

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }


    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //检测是否为多媒体上传
        if (!ServletFileUpload.isMultipartContent(request)) {
            //如果不是则停止
            PrintWriter writer = response.getWriter();
            writer.println("Error:表单必须包含enctype=multipart/from-data");
            writer.flush();
            return;
        }
        //配置上传参数
        DiskFileItemFactory factory = new DiskFileItemFactory();
        //设置内存临界值 -超过后将产生临时文件并存储于临时目录中
        factory.setSizeThreshold(MEMORY_THRESHOLD);
        //设置临时存储目录
        factory.setRepository(new File(System.getProperty("java.io.tmpdir")));

        ServletFileUpload upload = new ServletFileUpload(factory);
        //设置最大文件上传值