SSM-----------------文件上传并显示到页面采用jquery

文件上传

导包

SSM-----------------文件上传并显示到页面采用jquery

Springmvc.xml配置支持文件上传

SSM-----------------文件上传并显示到页面采用jquery

Html/JS

第一种（失败了）

SSM-----------------文件上传并显示到页面采用jquery

第二种：

<%--
  Created by IntelliJ IDEA.
  User: gyf
  Date: 2018/5/25
  Time: 10:25
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<html>
<head>
    <script src="${pageContext.request.contextPath}/js/jquery-1.8.3.js"></script>
    <script src="${pageContext.request.contextPath}/js/jquery.form.js"></script>
    <title>编辑商品</title>
<script type="text/javascript">
    function sumbitImage() {
        alert("提交图片到后台");
        var dataoptions={
            type:'post',

            url:'${pageContext.request.contextPath}/upload/itemspic.do',
            success:function (respData) {
                //var jsonObj = $.parseJSON(respData);
               var  obj =JSON.parse(respData);

                 $('#pic').attr('src',obj.imgUrl);
                console.log(obj.imgUrl);
                $('#hiddenPic').val(obj.imgUrl)
            }
        }
        $('#itemsForm').ajaxSubmit(dataoptions)
    }
</script>

</head>
<body>
<form id="itemsForm" action="${pageContext.request.contextPath}/items/update.do" method="post">
    <table border="1">
        <tr>
            <td>名称</td>
            <td>
                <input type="text" name="name" value="${items.name}"></td>
            <input type="hidden" name="id" value="${items.id}"></td>
        </tr>
        <tr>
            <td>价格</td>
            <td><input type="text" name="price" value="${items.price}"></td>
        </tr>
        <tr>
            <td>描述</td>
            <td><textarea cols="20" rows="5" name="detail">${items.detail}</textarea></td>
        </tr>
        <tr>
            <td>图片</td>
            <td>
                <img id="pic" src="${items.pic}" width="100px" height="100px">
                <input type="file" name="itemspic1" οnchange="sumbitImage();">

                <input id="hiddenPic" type="hidden" name="pic" value="${items.pic}">
            </td>
        </tr>
        <tr>
            <td colspan="2">
                <input type="submit" value="更新">
            </td>
        </tr>
    </table>

</form>
</body>
</html>

后台

第一种（没采用）

@Controller

@RequestMapping("upload")

public class UploadController {

@RequestMapping("itemsPic")

public void itemsPic(HttpServletRequest request,String fileName, PrintWriter writer) throws Exception{

MultipartHttpServletRequest mulRequest = (MultipartHttpServletRequest) request;

//通过字段名获取文件数据

MultipartFile file1 = mulRequest.getFile(fileName);

System.out.println(fileName + ":上传文件大小 " + file1.getSize());

//格式化文件名

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS");

String saveName = sdf.format(new Date());

Random rd = new Random();

for(int i=0;i<3;i++){

saveName += rd.nextInt(10);//添加三个随机数

}

//文件后缀名

String suffix = file1.getOriginalFilename().split("\\.")[1];

String saveFileName = saveName + "." + suffix;

//文件保存目录

String dir = request.getServletContext().getRealPath("/upload");

File dirFile = new File(dir);

if(dirFile.exists() == false)dirFile.mkdirs();

//文件保存路径

String relativePath = "/upload/" + saveFileName;

String totalPath = request.getServletContext().getRealPath(relativePath);

System.out.println(totalPath);

File newFile = new File(totalPath);

//保存

FileCopyUtils.copy(file1.getInputStream(), new FileOutputStream(newFile));

Thread.sleep(2000);

//file1.transferTo(newFile);

//返回一个相对路径相对路径和全路径

String serverIp = "http://127.0.0.1:8080" + request.getServletContext().getContextPath();

String respJson = "{\"imgUrl\":\"" + serverIp + relativePath+"\"}";

writer.write(respJson);

}

第二种：

package com.dong.backoffice.web.controller;

import com.dong.backoffice.model.Items;
import com.dong.backoffice.service.IItemService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.Date;
import java.util.List;
import java.util.UUID;

@Controller
@RequestMapping("upload")
public class UpdateLoadController {
    @Autowired
    private IItemService iItemService;

    @RequestMapping("itemspic")
    public void itemspic(HttpServletRequest request, HttpServletResponse response) throws Exception {
        MultipartHttpServletRequest    multipartHttpServletRequest= (MultipartHttpServletRequest) request;
        //1.获取图片数据
        MultipartFile multipartFile=multipartHttpServletRequest.getFile("itemspic1");
        //2.把图片保存在某个路径

        //2.1文件保存的文件夹路径
        String uploadFolder=request.getServletContext().getRealPath("/upload");
        File file=new File(uploadFolder);
        if(!file.exists()){
            file.mkdirs();
        }
        //2.2.文件
       // 获取图片后缀

     String suffix=multipartFile.getOriginalFilename().split("\\.")[1];
        String fileName= UUID.randomUUID().toString().replace("-","")+"."+suffix;
        String totalPath = uploadFolder + "\\" + fileName;
        FileCopyUtils.copy(multipartFile.getInputStream(),new FileOutputStream(new File(totalPath)));
        //返回数据给客户端
        String imgURL = "http://localhost:8088/SSSMDemo/upload/" + fileName;
        String responseJson = "{\"imgUrl\":\"" + imgURL  + "\"}";
        response.setHeader("content-Type","text/html;charset=utf-8");
        System.out.println(responseJson);
        response.getWriter().write(responseJson);
    }


}