SpringMvc 普通文件本地上传(AJAX)（SpringMvc⑥）

前言：先思考一下文件上传到哪里？---------服务器

①在表单中 

②method的提交方式是post

③上传的文件编码不能是默认编码，要为二进制编(enctype="multipart/form-date")

④input的类型是File类型 并且输入框要有name属性

客户端发送请求到达前端控制器，--》文件解析器---》返回给前端控制器--》Controller中文件上传的方法。

注意：需要将表单中的数据存储到数据库，不能直接存图片，需要存储图片的路径

3.1 配置文件上传的解析器

 3.2 文件上传的依赖

 

  commons-fileupload
  commons-fileupload
  1.4

3.3 Jsp前端代码

<%--
  Created by IntelliJ IDEA.
  User: 24284
  Date: 2021/12/7
  Time: 15:00
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    




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3.4 controller 控制层代码

@Controller
public class UploadController1 {

    @RequestMapping("/a")
    public String uoload01(MultipartFile myfile, HttpServletRequest request, User user){

        HttpSession session = request.getSession();
        ServletContext servletContext = session.getServletContext();
        String path = servletContext.getRealPath("/upload");

        File file = new File(path);
        if(!file.exists()){
            file.mkdir();
        }
        String filename = myfile.getOriginalFilename();

        filename=new Date().getTime()+filename;
        File target = new File(path + "/"+ filename);
        try {
            myfile.transferTo(target);
        } catch (Exception e) {
            e.printStackTrace();
        }
        String headImg="http://localhost:8080/SpringMvc05/upload/"+filename;
        request.setAttribute("imgsrc",headImg);
        user.setHeadImg(headImg);
        return "success";    

    }

}

3.5 看是否在tomcat的部署的工程目录下有选择的图片，若是有就代表本地上传成功

4.1 配置文件上传的解析器

 4.2 文件上传的依赖

  commons-fileupload
  commons-fileupload
  1.4

4.3 Jsp前端界面代码

<%--
  Created by IntelliJ IDEA.
  User: 24284
  Date: 2021/12/7
  Time: 16:10
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    
    




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4.4 Controller 控制代码

import java.io.File;
import java.io.IOException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;


@Controller
public class uploadController2 {
    @RequestMapping("/b")
    @ResponseBody
    public Map upload2(MultipartFile myfile, HttpServletRequest request, User user ){
        Mapmap=new HashMap();
        HttpSession session = request.getSession();
        ServletContext servletContext = session.getServletContext();
        String path = servletContext.getRealPath("upload");
        File file = new File(path);
        if(!file.exists()){
            file.mkdirs();
        }
        String filename = myfile.getOriginalFilename();
        filename = new Date().getTime() + filename;
        File target = new File(path + "/" + filename);
        try {
            myfile.transferTo(target);
            map.put("code",2000);
            map.put("msg","上传成功");
            map.put("imgsrc","http://localhost:8080/SpringMvc05/upload/"+filename);
            return map;
        } catch (IOException e) {
            e.printStackTrace();
        }
        map.put("code",5000);
        map.put("msg","上传失败");
        return map;
    }

}

同理在tomcat的服务部署目录下看能否找到上传的文件