feat: 添加传入 multipartfile 类型的文件，直接解析CSV.

Author: GitSuperDrew

springboot-aop/src/main/java/com/study/module/controller/StuController.java

@@ -4,10 +4,13 @@
 import com.study.module.entity.Stu;
 import com.study.module.enums.BusinessType;
 import com.study.module.service.StuService;
+import com.study.module.util.office.CsvUtil;
 import org.springframework.util.ObjectUtils;
 import org.springframework.web.bind.annotation.*;
+import org.springframework.web.multipart.MultipartFile;
 
 import javax.annotation.Resource;
+import java.util.Map;
 
 /**
  * (Stu)表控制层
@@ -24,6 +27,17 @@ public class StuController {
     @Resource
     private StuService stuService;
 
+    /**
+     * 读取CSV文件
+     *
+     * @param multipartFile 文件
+     * @return JSON Data
+     */
+    @PostMapping("/readCSV")
+    public Map<String, Object> readCSV(@RequestParam(value = "multipartFile") MultipartFile multipartFile) {
+        return CsvUtil.readCsv(multipartFile, true);
+    }
+
     /**
      * 通过主键查询单条数据
      *

springboot-aop/src/main/java/com/study/module/util/office/CsvUtil.java

@@ -6,6 +6,7 @@
 import lombok.Data;
 import lombok.NoArgsConstructor;
 import org.springframework.util.ObjectUtils;
+import org.springframework.web.multipart.MultipartFile;
 
 import java.io.*;
 import java.lang.reflect.Field;
@@ -156,6 +157,38 @@ public static Map<String, Object> readCsv(String csvFilePath, boolean isHasHeade
         return result;
     }
 
+    /**
+     * 解析 CSV 文件，返回CSV的数据。
+     *
+     * @param multipartFile controller 前端上传文件类型的参数值提交。
+     * @param isHasHeader   csv文件中是否包含表头数据
+     * @return {"data":[...], "header": []} 其中可有可无
+     */
+    public static Map<String, Object> readCsv(MultipartFile multipartFile, Boolean isHasHeader) {
+        Map<String, Object> result = new HashMap<>(2);
+        try {
+            // 中文乱码问题：源文件的编码格式与程序设置的读取格式不一致所致（调整csv文件为UTF-8集合）
+            DataInputStream in = new DataInputStream(multipartFile.getInputStream());
+            BufferedReader reader = new BufferedReader(new InputStreamReader(in, "gbk"));
+            if (isHasHeader) {
+                result.put("header", reader.readLine());
+            }
+            String line;
+            List<List<String>> dataList = new ArrayList<>();
+            while ((line = reader.readLine()) != null) {
+                String[] parts = splitCSV(line);
+                if (!ObjectUtils.isEmpty(parts)) {
+                    List<String> lineData = Arrays.asList(parts);
+                    dataList.add(lineData);
+                }
+            }
+            result.put("data", dataList);
+        } catch (Exception exception) {
+            exception.printStackTrace();
+        }
+        return result;
+    }
+
     public static void testSplitCSV() {
         String src1 = "\"fh,zg\",sdf,\"asfs,\",\",dsdf\",\"aadf\"\"\",\"\"\"hdfg\",\"fgh\"\"dgnh\",hgfg'dfh,\"asdfa\"\"\"\"\",\"\"\"\"\"fgjhg\",\"gfhg\"\"\"\"hb\"";
         try {