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="width: 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="width: 400px; height: 200px;">
<!-- <img th:src="@{/img/profile.jpg}">-->
<img th:src="*{goodsImg}"/>
</div>
<div class="fileinput-preview fileinput-exists thumbnail" style="max-width: 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