基于若依的上传_代码总结

自学SpringBoot的过程中，发现开源的Ruoyi比较不错，而且作者公开全部的源码，再次谢谢作者

顺便帮这个业界良心做个推广 https://www.ruoyi.vip/ ，有兴趣学习和提高的网友们可以去学习下。

先总结，代码在下面

（1）要保存的这个表，只有一个字段是用来存储图片路径的字段；其他字段都是正常字段，和上传无关；

（2）基本思路是先上传，获得上传的文件名及路径后，再保存相关信息入数据库；

遇到的问题有

（1）不需要修改form的 enctype属性，我的代码是没有的

enctype=”multipart/form-data”

（2）用Ruoyi开源的自动生成的工具，生成的代码，但是因为这个仅仅是工具，需要改造成要符合上传图片预览的情况

所以要改原来的代码；

我参考了Ruoyi自己带的jasny.html文件，而Ruoyi参考的是 https://github.com/jasny/bootstrap 上传组件

（3）修改后台接收部分要修改

自动生成的是

public AjaxResult addSave(AppGoods appGoods)

保留这种方式，会报错

Failed to convert property value of type 'org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile' to required type 'java.lang.String' for property 'goodsImg'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile' to required type 'java.lang.String' for property 'goodsImg': no matching editors or conversion strategy found

修改成 public AjaxResult addSave(@RequestParam(value="goodsImg",required=false) MultipartFile file,AppGoods appGoods)

还是会报错

Failed to convert property value of type 'org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile' to required type 'java.lang.String' for property 'goodsImg'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile' to required type 'java.lang.String' for property 'goodsImg': no matching editors or conversion strategy found

万般无奈，修改成

public AjaxResult addSave(@RequestParam(value="goodsImg",required=false) MultipartFile file, HttpServletRequest request_in)

重新按照字段进行赋值就不报错了

感觉一个一个字段赋值，有些蠢，不知道有没有更好的解决方法

代码如下

另外，ajax提交时，这个也是不能变成 contentType: "application/json"

只有 contentType: false 时，才是能够成功的，

主要是我对JS底层还是不够充分了解啊。

新增的画面

<!DOCTYPE html>
<html lang="zh" xmlns:th="http://www.thymeleaf.org" >
<head>
    <th:block th:include="include :: header('新增/goods')" />
    <th:block th:include="include :: datetimepicker-css" />
    <th:block th:include="include :: jasny-bootstrap-css" />
</head>
<body class="white-bg">
    <div class="wrapper wrapper-content animated fadeInRight ibox-content">
        <form class="form-horizontal m" id="form-goods-add" >
            <div class="form-group">    
                <label class="col-sm-3 control-label">商品名：</label>
                <div class="col-sm-8">
                    <input id="goodsName"  name="goodsName" class="form-control" type="text">
                </div>
            </div>
            <div class="form-group">    
                <label class="col-sm-3 control-label">进货价：</label>
                <div class="col-sm-8">
                    <input id="purchasePrice" name="purchasePrice" class="form-control" type="text">
                </div>
            </div>
            <div class="form-group">    
                <label class="col-sm-3 control-label">进货日期：</label>
                <div class="col-sm-8">
                    <div class="input-group date">
                        <input id="purchaseDate" name="purchaseDate" class="form-control" placeholder="yyyy-MM-dd" type="text">
                        <span class="input-group-addon"><i class="fa fa-calendar"></i></span>
                    </div>
                </div>
            </div>
            <div class="form-group">
                <label class="col-sm-3 control-label">图片路径：</label>
                <div class="col-sm-8">
<!--                    <textarea name="goodsImg" class="form-control"></textarea>-->

                    <div class="fileinput fileinput-new" data-provides="fileinput">
                        <div class="fileinput-preview thumbnail" data-trigger="fileinput" style=" 400px; height: 200px;"></div>
                        <div >
                            <span class="btn btn-white btn-file"><span class="fileinput-new">选择图片</span><span class="fileinput-exists">更改</span><input  id="goodsImg"  name="goodsImg" type="file"></span>
                            <a href="#" class="btn btn-white fileinput-exists" data-dismiss="fileinput">清除</a>
                        </div>
                    </div>
                </div>
            </div>


        </form>
    </div>
    <th:block th:include="include :: footer" />
    <th:block th:include="include :: datetimepicker-js" />
    <th:block th:include="include :: jasny-bootstrap-js" />
    <script th:inline="javascript">
        var prefix = ctx + "app/goods"
        $("#form-goods-add").validate({
            focusCleanup: true
        });

        function submitHandler() {

            var formData = new FormData();
            if ($('#goodsImg')[0].files[0] == null) {
                $.modal.alertWarning("请先选择文件路径");
                return false;
            }

            formData.append('goodsName', $("#goodsName")[0].value);
            formData.append('purchasePrice', $("#purchasePrice")[0].value);
            formData.append('purchaseDate', $("#purchaseDate")[0].value);
            formData.append('goodsImg', $('#goodsImg')[0].files[0]);
            $.ajax({
                url: prefix + "/add",
                type: 'post',
                cache: false,
                data: formData,
                processData: false,
                contentType: false,
                dataType: "json",
                success: function(result) {
                    $.operate.successCallback(result);
                }
            });


        }

        $("input[name='purchaseDate']").datetimepicker({
            format: "yyyy-mm-dd",
            minView: "month",
            autoclose: true
        });
    </script>
</body>
</html>

后台接收数据的Controller

package com.ruoyi.app.controller;

import java.io.IOException;
import java.text.ParseException;
import java.util.List;

import com.alibaba.fastjson.JSON;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.utils.DateUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.file.FileUploadUtils;
import org.apache.shiro.authz.annotation.RequiresPermissions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.*;
import com.ruoyi.common.annotation.Log;
import com.ruoyi.common.enums.BusinessType;
import com.ruoyi.app.domain.AppGoods;
import com.ruoyi.app.service.IAppGoodsService;
import com.ruoyi.common.core.controller.BaseController;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.utils.poi.ExcelUtil;
import com.ruoyi.common.core.page.TableDataInfo;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import javax.servlet.http.HttpServletRequest;

/**
 * /goodsController
 * 
 * @author ruoyi
 * @date 2021-12-28
 */
@Controller
@RequestMapping("/app/goods")
public class AppGoodsController extends BaseController
{
    private String prefix = "app/goods";

    @Autowired
    private IAppGoodsService appGoodsService;

    @RequiresPermissions("app:goods:view")
    @GetMapping()
    public String goods()
    {
        return prefix + "/goods";
    }

    /**
     * 查询/goods列表
     */
    @RequiresPermissions("app:goods:list")
    @PostMapping("/list")
    @ResponseBody
    public TableDataInfo list(AppGoods appGoods)
    {
        startPage();
        List<AppGoods> list = appGoodsService.selectAppGoodsList(appGoods);
        return getDataTable(list);
    }

    /**
     * 导出/goods列表
     */
    @RequiresPermissions("app:goods:export")
    @Log(title = "/goods", businessType = BusinessType.EXPORT)
    @PostMapping("/export")
    @ResponseBody
    public AjaxResult export(AppGoods appGoods)
    {
        List<AppGoods> list = appGoodsService.selectAppGoodsList(appGoods);
        ExcelUtil<AppGoods> util = new ExcelUtil<AppGoods>(AppGoods.class);
        return util.exportExcel(list, "/goods数据");
    }

    /**
     * 新增/goods
     */
    @GetMapping("/add")
    public String add()
    {
        return prefix + "/add";
    }

    /**
     * 新增保存/goods
     */
    @RequiresPermissions("app:goods:add")
    @Log(title = "/goods", businessType = BusinessType.INSERT)
    @PostMapping("/add")
    @ResponseBody

    public AjaxResult addSave(@RequestParam(value="goodsImg",required=false) MultipartFile file)
    {

        AppGoods appGoods =new AppGoods();
        try {

        if (file != null) {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            // 上传并返回新文件名称
            String fileName = null;

            fileName = FileUploadUtils.upload(filePath, file);

            appGoods.setGoodsName(getRequest().getParameter("goodsName"));

            appGoods.setPurchaseDate(DateUtils.parseDate(getRequest().getParameter("purchaseDate"),new String[]{"yyyy-MM-dd"}));

            appGoods.setPurchasePrice(org.apache.commons.lang3.math.NumberUtils.toScaledBigDecimal(getRequest().getParameter("purchasePrice")));

            appGoods.setGoodsImg(fileName);

        }
        } catch (IOException | ParseException e) {
            e.printStackTrace();
        }

        return toAjax(appGoodsService.insertAppGoods(appGoods));
    }

    /**
     * 修改/goods
     */
    @RequiresPermissions("app:goods:edit")
    @GetMapping("/edit/{id}")
    public String edit(@PathVariable("id") Long id, ModelMap mmap)
    {
        AppGoods appGoods = appGoodsService.selectAppGoodsById(id);
        mmap.put("appGoods", appGoods);
        return prefix + "/edit";
    }

    /**
     * 修改保存/goods
     */
    @RequiresPermissions("app:goods:edit")
    @Log(title = "/goods", businessType = BusinessType.UPDATE)
    @PostMapping("/edit")
    @ResponseBody
    //public AjaxResult editSave(AppGoods appGoods)
    public AjaxResult editSave(@RequestParam(value="goodsImg",required=false) MultipartFile file)
    {

        AppGoods appGoods =new AppGoods();
        try {

            if (file != null) {
                // 上传文件路径
                String filePath = RuoYiConfig.getUploadPath();
                // 上传并返回新文件名称
                String fileName = null;

                fileName = FileUploadUtils.upload(filePath, file);

                appGoods.setId(new Long(getRequest().getParameter("id")));

                appGoods.setGoodsName(getRequest().getParameter("goodsName"));

                appGoods.setPurchaseDate(DateUtils.parseDate(getRequest().getParameter("purchaseDate"),new String[]{"yyyy-MM-dd"}));

                appGoods.setPurchasePrice(org.apache.commons.lang3.math.NumberUtils.toScaledBigDecimal(getRequest().getParameter("purchasePrice")));

                appGoods.setGoodsImg(fileName);

            }
        } catch (IOException | ParseException e) {
            e.printStackTrace();
        }
        return toAjax(appGoodsService.updateAppGoods(appGoods));
    }

    /**
     * 删除/goods
     */
    @RequiresPermissions("app:goods:remove")
    @Log(title = "/goods", businessType = BusinessType.DELETE)
    @PostMapping( "/remove")
    @ResponseBody
    public AjaxResult remove(String ids)
    {
        return toAjax(appGoodsService.deleteAppGoodsByIds(ids));
    }
}

修改页面代码

<!DOCTYPE html>
<html lang="zh" xmlns:th="http://www.thymeleaf.org" >
<head>
    <th:block th:include="include :: header('修改商品')" />
    <th:block th:include="include :: datetimepicker-css" />
    <th:block th:include="include :: jasny-bootstrap-css" />
</head>
<body class="white-bg">
    <div class="wrapper wrapper-content animated fadeInRight ibox-content">
        <form class="form-horizontal m" id="form-goods-edit" th:object="${appGoods}">
            <input name="id" th:field="*{id}" type="hidden">
            <div class="form-group">    
                <label class="col-sm-3 control-label">商品名：</label>
                <div class="col-sm-8">
                    <input name="goodsName"  id="goodsName" th:field="*{goodsName}" class="form-control" type="text">
                </div>
            </div>
            <div class="form-group">    
                <label class="col-sm-3 control-label">进货价：</label>
                <div class="col-sm-8">
                    <input name="purchasePrice" id="purchasePrice" th:field="*{purchasePrice}" class="form-control" type="text">
                </div>
            </div>
            <div class="form-group">    
                <label class="col-sm-3 control-label">进货日期：</label>
                <div class="col-sm-8">
                    <div class="input-group date">
                        <input id="purchaseDate" name="purchaseDate" th:value="${#dates.format(appGoods.purchaseDate, 'yyyy-MM-dd')}" class="form-control" placeholder="yyyy-MM-dd" type="text">
                        <span class="input-group-addon"><i class="fa fa-calendar"></i></span>
                    </div>
                </div>
            </div>

            <div class="form-group">
                <label class="col-sm-3 control-label">图片</label>
                <div class="col-sm-8">
                <div class="fileinput fileinput-new" data-provides="fileinput">
                    <div class="fileinput-new thumbnail" style=" 400px; height: 200px;">
<!--                        <img th:src="@{/img/profile.jpg}">-->
                        <img th:src="*{goodsImg}"/>
                    </div>
                    <div class="fileinput-preview fileinput-exists thumbnail" style="max- 200px; max-height: 150px;"></div>
                    <div>
                        <span class="btn btn-white btn-file"><span class="fileinput-new">选择图片</span><span class="fileinput-exists">更改</span><input  id="goodsImg"  name="goodsImg" type="file"></span>
                        <a href="#" class="btn btn-white fileinput-exists" data-dismiss="fileinput">清除</a>
                    </div>
                </div>
                </div>
            </div>


        </form>
    </div>
    <th:block th:include="include :: footer" />
    <th:block th:include="include :: datetimepicker-js" />
    <th:block th:include="include :: jasny-bootstrap-js" />
    <script th:inline="javascript">
        var prefix = ctx + "app/goods";
        $("#form-goods-edit").validate({
            focusCleanup: true
        });

        // function submitHandler() {
        //     if ($.validate.form()) {
        //         $.operate.save(prefix + "/edit", $('#form-goods-edit').serialize());
        //     }
        // }


        function submitHandler() {

            //debugger;
            var formData = new FormData();
            if ($('#goodsImg')[0].files[0] == null) {
                $.modal.alertWarning("请先选择文件路径");
                return false;
            }
            formData.append('id', $("#id")[0].value);
            formData.append('goodsName', $("#goodsName")[0].value);
            //alert($("#goodsName")[0].value);
            formData.append('purchasePrice', $("#purchasePrice")[0].value);
            formData.append('purchaseDate', $("#purchaseDate")[0].value);
            formData.append('goodsImg', $('#goodsImg')[0].files[0]);

            $.ajax({
                url: prefix + "/edit",
                type: 'post',
                cache: false,
                data: formData,
                processData: false,
                contentType: false,
                //contentType: "application/json", //--错误的配置
                dataType: "json",
                success: function(result) {
                    $.operate.successCallback(result);
                }
            });


        }


        $("input[name='purchaseDate']").datetimepicker({
            format: "yyyy-mm-dd",
            minView: "month",
            autoclose: true
        });
    </script>
</body>
</html>

列表页面代码

<!DOCTYPE html>
<html lang="zh" xmlns:th="http://www.thymeleaf.org" xmlns:shiro="http://www.pollix.at/thymeleaf/shiro">
<head>
    <th:block th:include="include :: header('商品列表')" />
</head>
<body class="gray-bg">
     <div class="container-div">
        <div class="row">
            <div class="col-sm-12 search-collapse">
                <form id="formId">
                    <div class="select-list">
                        <ul>
                            <li>
                                <label>商品名：</label>
                                <input type="text" name="goodsName"/>
                            </li>
                            <li>
                                <label>进货价：</label>
                                <input type="text" name="purchasePrice"/>
                            </li>
                            <li>
                                <label>进货日期：</label>
                                <input type="text" class="time-input" placeholder="请选择进货日期" name="purchaseDate"/>
                            </li>
                            <li>
                                <a class="btn btn-primary btn-rounded btn-sm" onclick="$.table.search()"><i class="fa fa-search"></i> 搜索</a>
                                <a class="btn btn-warning btn-rounded btn-sm" onclick="$.form.reset()"><i class="fa fa-refresh"></i> 重置</a>
                            </li>
                        </ul>
                    </div>
                </form>
            </div>

            <div class="btn-group-sm" id="toolbar" role="group">
                <a class="btn btn-success" onclick="$.operate.add()" shiro:hasPermission="app:goods:add">
                    <i class="fa fa-plus"></i> 添加
                </a>
                <a class="btn btn-primary single disabled" onclick="$.operate.edit()" shiro:hasPermission="app:goods:edit">
                    <i class="fa fa-edit"></i> 修改
                </a>
                <a class="btn btn-danger multiple disabled" onclick="$.operate.removeAll()" shiro:hasPermission="app:goods:remove">
                    <i class="fa fa-remove"></i> 删除
                </a>
                <a class="btn btn-warning" onclick="$.table.exportExcel()" shiro:hasPermission="app:goods:export">
                    <i class="fa fa-download"></i> 导出
                </a>
            </div>
            <div class="col-sm-12 select-table table-striped">
                <table id="bootstrap-table"></table>
            </div>
        </div>
    </div>
    <th:block th:include="include :: footer" />
    <script th:inline="javascript">
        var editFlag = [[${@permission.hasPermi('app:goods:edit')}]];
        var removeFlag = [[${@permission.hasPermi('app:goods:remove')}]];
        var prefix = ctx + "app/goods";

        $(function() {
            var options = {
                url: prefix + "/list",
                createUrl: prefix + "/add",
                updateUrl: prefix + "/edit/{id}",
                removeUrl: prefix + "/remove",
                exportUrl: prefix + "/export",
                modalName: "商品",
                columns: [{
                    checkbox: true
                },
                {
                    field: 'id',
                    title: '',
                    visible: false
                },
                {
                    field: 'goodsName',
                    title: '商品名'
                },
                {
                    field: 'purchasePrice',
                    title: '进货价'
                },
                {
                    field: 'purchaseDate',
                    title: '进货日期'
                },

                    {
                        field:'goodsImg',
                        title: '图片',
                        formatter: function(value, row, index) {
                            // 图片预览（注意：如存储在本地直接获取数据库路径，如有配置context-path需要使用ctx+路径）
                            // 如：/profile/upload/2019/08/08/3b7a839aced67397bac694d77611ce72.png
                            return $.table.imageView(row.goodsImg);

                        }
                    },
                {
                    title: '操作',
                    align: 'center',
                    formatter: function(value, row, index) {
                        var actions = [];
                        actions.push('<a class="btn btn-success btn-xs ' + editFlag + '" href="javascript:void(0)" onclick="$.operate.edit(\'' + row.id + '\')"><i class="fa fa-edit"></i>编辑</a> ');
                        actions.push('<a class="btn btn-danger btn-xs ' + removeFlag + '" href="javascript:void(0)" onclick="$.operate.remove(\'' + row.id + '\')"><i class="fa fa-remove"></i>删除</a>');
                        return actions.join('');
                    }
                }]
            };
            $.table.init(options);
        });
    </script>
</body>
</html>

很久没有写JAVA代码了，记录一下~

2022年1月5日重新修改了Controller代码

修改了列表及修改代码

再次感谢若依的作者，真的不错。TEXT类型的字段，能够单独生成富文本模式，且支持上传

用空常来坐坐 https://www.cnblogs.com/alexgl2008/

相关阅读:
Spring 中使用 Hibernate
数据源
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 Spring Boot 整合模板引擎 Freemaker、thymeleaf
Spring Boot 使用 Filter、Servlet、Listener、Interceptor
Spring Boot 全局异常
 Spring Boot 启动方式
 Spring MVC 异常处理
 Spring MVC 装配拦截器
 结构体做函数参数
原文地址：https://www.cnblogs.com/alexgl2008/p/15762568.html