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
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();
Listlist = 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)
{
Listlist = appGoodsService.selectAppGoodsList(appGoods);
ExcelUtilutil = new ExcelUtil (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
列表页面代码
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