ADD file via upload

src/main/java/com/controller/SubClassifyInfoController.java

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+package com.example.controller;
+
+import cn.hutool.core.collection.CollUtil;
+import cn.hutool.core.collection.CollectionUtil;
+import cn.hutool.core.io.IoUtil;
+import cn.hutool.core.util.ObjectUtil;
+import cn.hutool.core.util.StrUtil;
+import cn.hutool.poi.excel.ExcelUtil;
+import cn.hutool.poi.excel.ExcelWriter;
+import com.example.common.Result;
+import com.example.common.ResultCode;
+import com.example.entity.SubClassifyInfo;
+import com.example.service.*;
+import com.example.vo.SubClassifyInfoVo;
+import com.example.vo.SubClassifyInfoVo;
+import com.github.pagehelper.PageHelper;
+import com.github.pagehelper.PageInfo;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.multipart.MultipartFile;
+
+import javax.annotation.Resource;
+import javax.servlet.ServletOutputStream;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+@RestController
+@RequestMapping(value = "/subClassifyInfo")
+public class SubClassifyInfoController {
+    @Resource
+    private SubClassifyInfoService subClassifyInfoService;
+
+    @PostMapping
+    public Result<SubClassifyInfo> add(@RequestBody SubClassifyInfoVo subClassifyInfo) {
+        subClassifyInfoService.add(subClassifyInfo);
+        return Result.success(subClassifyInfo);
+    }
+
+    @DeleteMapping("/{id}")
+    public Result delete(@PathVariable Long id) {
+        subClassifyInfoService.delete(id);
+        return Result.success();
+    }
+
+    @PutMapping
+    public Result update(@RequestBody SubClassifyInfoVo subClassifyInfo) {
+        subClassifyInfoService.update(subClassifyInfo);
+        return Result.success();
+    }
+
+    @GetMapping("/{id}")
+    public Result<SubClassifyInfo> detail(@PathVariable Long id) {
+        SubClassifyInfo subClassifyInfo = subClassifyInfoService.findById(id);
+        return Result.success(subClassifyInfo);
+    }
+
+    @GetMapping
+    public Result<List<SubClassifyInfoVo>> all() {
+        return Result.success(subClassifyInfoService.findAll());
+    }
+
+    @GetMapping("/page/{name}")
+    public Result<PageInfo<SubClassifyInfoVo>> page(@PathVariable String name,
+                                                @RequestParam(defaultValue = "1") Integer pageNum,
+                                                @RequestParam(defaultValue = "5") Integer pageSize,
+                                                HttpServletRequest request) {
+        return Result.success(subClassifyInfoService.findPage(name, pageNum, pageSize, request));
+    }
+
+    /**
+    * 批量通过excel添加信息
+    * @param file excel文件
+    * @throws IOException
+    */
+    @PostMapping("/upload")
+    public Result upload(MultipartFile file) throws IOException {
+
+        List<SubClassifyInfo> infoList = ExcelUtil.getReader(file.getInputStream()).readAll(SubClassifyInfo.class);
+        if (!CollectionUtil.isEmpty(infoList)) {
+            // 处理一下空数据
+            List<SubClassifyInfo> resultList = infoList.stream().filter(x -> ObjectUtil.isNotEmpty(x.getName())).collect(Collectors.toList());
+            for (SubClassifyInfo info : resultList) {
+                subClassifyInfoService.add(info);
+            }
+        }
+        return Result.success();
+    }
+
+    @GetMapping("/getExcelModel")
+    public void getExcelModel(HttpServletResponse response) throws IOException {
+        // 1. 生成excel
+        Map<String, Object> row = new LinkedHashMap<>();
+		row.put("name", "");
+		row.put("description", "");
+		row.put("classifyId", 1);
+
+        List<Map<String, Object>> list = CollUtil.newArrayList(row);
+
+        // 2. 写excel
+        ExcelWriter writer = ExcelUtil.getWriter(true);
+        writer.write(list, true);
+
+        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
+        response.setHeader("Content-Disposition","attachment;filename=subClassifyInfoModel.xlsx");
+
+        ServletOutputStream out = response.getOutputStream();
+        writer.flush(out, true);
+        writer.close();
+        IoUtil.close(System.out);
+    }
+}