feature: [课程] 课程中心界面

docs/一个非常奇怪的错误.md

@@ -0,0 +1,28 @@
+问题	本质原因
+访问 POST 接口用 GET，路径又模糊匹配	Spring 把你写的 testMethod 误当成其他接口的参数，比如 {id}，尝试类型转换失败
+预期 405 报错却看到类型转换失败	是路径匹配到了别的接口，没走到你定义的方法
+解决办法	用正确的请求方式 / 添加明确前缀 / 避免通配路径冲突
+
+现在有这个一个方法
+
+```java
+@GetMapping("{id}")
+public Result<Course> queryById(@PathVariable("id") Integer id) {
+return Result.success(courseService.getById(id));
+}
+```
+
+我又写了一个方法
+```java
+@PostMapping("/testMethod")
+public void testMethod(@RequestParam(name = "page") Long pageNum){
+
+}
+```
+然后我请求
+```java
+GET http://localhost:8084/bs/courses/testMethod?page=1
+```
+请求其实走到了上面
+
+Spring 的路径匹配是优先按 URL 结构匹配，方法类型（GET/POST）其次。

src/main/java/com/guwan/backend/JudgeEngine.java

@@ -1,6 +1,5 @@
 package com.guwan.backend;
 
-import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
 import java.lang.reflect.Method;

src/main/java/com/guwan/backend/VideoDuration.java

@@ -1,52 +0,0 @@
-package com.guwan.backend;
-
-import org.apache.tika.metadata.Metadata;
-import org.apache.tika.parser.AutoDetectParser;
-import org.apache.tika.parser.ParseContext;
-import org.apache.tika.parser.Parser;
-import org.apache.tika.sax.BodyContentHandler;
-
-import java.io.FileInputStream;
-import java.io.InputStream;
-import java.net.URL;
-
-public class VideoDuration {
-//    public static void main(String[] args) {
-//    /*    String preSignedUrl = "http://localhost:9000/videos/ffffad37-9804-4765-ae18-3f8dcda9bea8.mp4"; // Minio 预签名 URL
-//
-//        try (InputStream stream = new URL(preSignedUrl).openStream()) {
-//            Metadata metadata = new Metadata();
-//            Parser parser = new AutoDetectParser();
-//            parser.parse(stream,  new BodyContentHandler(), metadata, new ParseContext());
-//
-//            String duration = metadata.get("duration");
-//            System.out.println("视频时长（毫秒）: " + duration);
-//        } catch (Exception e) {
-//            e.printStackTrace();
-//        }*/
-//       int i = 0;
-//       while (i< 5){
-//           if (i ==3){
-//               i++;
-//               continue;
-//           }
-//           System.out.println(i);
-//           i++;
-//       }
-//
-//    }
-
-
-    static boolean foo(char x) {
-        System.out.print(x);
-        return true;
-    }
-
-    public static void main(String[] args) {
-        int i = 0;
-        for (foo('A'); foo('B') && (i < 2); foo('C')) {
-            i++;
-            foo('D');
-        }
-    }
-}

src/main/java/com/guwan/backend/constant/SecurityConstants.java

@@ -23,6 +23,11 @@ public class SecurityConstants {
 
             "/captcha/verify", //验证码认证接口
 
+            "/bs/courses/testMethod",
+            "/bs/courses/testMethodOne",
+
+
+
             "/challenge",
             "/ws/**",
             "/faceTest", "/compareFaces",

src/main/java/com/guwan/backend/controller/CommonController.java

@@ -14,6 +14,7 @@ import dev.langchain4j.community.model.dashscope.QwenStreamingChatModel;
 import dev.langchain4j.model.chat.response.ChatResponse;
 import dev.langchain4j.model.chat.response.StreamingChatResponseHandler;
 import io.minio.MinioClient;
+import jakarta.transaction.Transactional;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import okhttp3.OkHttpClient;
@@ -74,6 +75,22 @@ public class CommonController {
                 (bucketName, minioUtil.uploadFile(bucketName, file))));
     }
 
+    @PostMapping("/test111111")
+    public Result<String> test111111(@RequestParam Integer id){
+        return null;
+    }
+
+    @GetMapping("/test222222")
+    public Result<String> test222222(){
+        return null;
+    }
+
+    @PostMapping("/test333333")
+    public Result<String> test333333(@RequestParam(name = "page") Long id){
+        return null;
+    }
+
+
 //    @PostMapping("/addBookComment")
 //    public Result<String> addBookComment(String url) {
 //        log.debug(url);

src/main/java/com/guwan/backend/controller/CourseController.java

@@ -4,15 +4,15 @@ package com.guwan.backend.controller;
 
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
-import com.baomidou.mybatisplus.extension.conditions.update.LambdaUpdateChainWrapper;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.guwan.backend.common.Result;
 import com.guwan.backend.common.SearchResult;
 import com.guwan.backend.mybatis.query.LambdaQueryWrapperX;
-import com.guwan.backend.pojo.dto.BSCategory;
+import com.guwan.backend.pojo.entity.BSCategory;
 import com.guwan.backend.pojo.dto.course.InsertCourseDTO;
 import com.guwan.backend.pojo.entity.*;
 import com.guwan.backend.pojo.response.CourseByAdminVO;
+import com.guwan.backend.pojo.response.CourseCenterVO;
 import com.guwan.backend.pojo.response.courseDetail.BaseSectionVO;
 import com.guwan.backend.pojo.response.courseDetail.ChapterVO;
 import com.guwan.backend.pojo.response.courseDetail.CourseDetailVO;
@@ -350,5 +350,55 @@ public class CourseController {
         return Result.success();
     }
 
+    @GetMapping("/getCourseCenterList")
+    public SearchResult getCourseCenterList(@RequestParam(name = "page") Long pageNum,
+                                            @RequestParam Long size,
+                                            @RequestParam(required = false) String categoryId,
+                                            @RequestParam(required = false) String levelId,
+                                            @RequestParam(required = false) String typeId,
+                                            @RequestParam(required = false) String sortBy,
+                                            @RequestParam(required = false) String search) {
+
+        Page<Course> page = new Page<>(pageNum, size);
+
+        long count = courseService.count();
+
+        List<Course> courseList = courseService.list(page, new
+                LambdaQueryWrapperX<Course>().eqIfPresent(Course::getCategoryId, categoryId)
+                .eqIfPresent(Course::getLevelId, levelId).eqIfPresent(Course::getTypeId, typeId)
+                .likeIfPresent(Course::getTitle, search));
+
+        List<CourseCenterVO> courseCenterVOList = courseList.stream().map(
+                course -> {
+                    CourseCenterVO courseCenterVO = new CourseCenterVO();
+                    BeanUtils.copyProperties(course, courseCenterVO);
+                    courseCenterVO.setTeacher(teacherService.getById(course.getTeacherId()).getName());
+                    return courseCenterVO;
+                }
+        ).toList();
+
+
+        if (sortBy != null && !sortBy.isEmpty()) {
+            if (sortBy.equals("newest")) {
+
+            }
+            if (sortBy.equals("popular")) {
+
+            }
+            if (sortBy.equals("rating")) {
+
+            }
+        }
+
+        return SearchResult.success(courseCenterVOList, count);
+    }
+
+    @PostMapping("/testMethod")
+    public void testMethod(@RequestParam(name = "page") Long pageNum){
+
+    }
+
+
+
 }
 

src/main/java/com/guwan/backend/mapper/BSCategoryMapper.java

@@ -1,6 +1,6 @@
 package com.guwan.backend.mapper;
 
-import com.guwan.backend.pojo.dto.BSCategory;
+import com.guwan.backend.pojo.entity.BSCategory;
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import org.apache.ibatis.annotations.Mapper;
 
@@ -8,7 +8,7 @@ import org.apache.ibatis.annotations.Mapper;
 * @author 12455
 * @description 针对表【category】的数据库操作Mapper
 * @createDate 2025-03-13 23:00:51
-* @Entity com.guwan.backend.pojo.dto.BSCategory
+* @Entity com.guwan.backend.pojo.entity.BSCategory
 */
 @Mapper
 public interface BSCategoryMapper extends BaseMapper<BSCategory> {

src/main/java/com/guwan/backend/pojo/dto/video/VideoDTO.java

@@ -1,57 +0,0 @@
-package com.guwan.backend.pojo.dto.video;
-
-import lombok.Data;
-import java.time.LocalDateTime;
-import io.swagger.v3.oas.annotations.media.Schema;
-
-@Schema(description = "视频信息DTO")
-@Data
-public class VideoDTO {
-    @Schema(description = "视频ID")
-    private Long id;
-
-    @Schema(description = "视频标题")
-    private String title;
-
-    @Schema(description = "视频描述")
-    private String description;
-
-    @Schema(description = "视频URL")
-    private String url;
-
-    @Schema(description = "封面URL")
-    private String coverUrl;
-
-    @Schema(description = "视频时长（秒）")
-    private Long duration;
-
-    @Schema(description = "文件大小（字节）")
-    private Long size;
-
-    @Schema(description = "状态：DRAFT-草稿，PUBLISHED-已发布，DELETED-已删除")
-    private String status;
-
-    @Schema(description = "上传用户ID")
-    private Long userId;
-
-    @Schema(description = "上传用户名")
-    private String username;
-
-    @Schema(description = "创建时间")
-    private LocalDateTime createdTime;
-
-    @Schema(description = "更新时间")
-    private LocalDateTime updatedTime;
-
-    @Schema(description = "观看次数")
-    private Integer viewCount;
-
-    @Schema(description = "点赞次数")
-    private Integer likeCount;
-
-    @Schema(description = "标签，多个用逗号分隔")
-    private String tags;
-
-    @Schema(description = "当前用户是否已点赞")
-    private Boolean hasLiked;
-} 

src/main/java/com/guwan/backend/pojo/entity/BSCategory.java

@@ -1,6 +1,5 @@
-package com.guwan.backend.pojo.dto;
+package com.guwan.backend.pojo.entity;
 
-import com.baomidou.mybatisplus.annotation.IdType;
 import com.baomidou.mybatisplus.annotation.TableField;
 import com.baomidou.mybatisplus.annotation.TableId;
 import com.baomidou.mybatisplus.annotation.TableName;

src/main/java/com/guwan/backend/pojo/response/CourseCenterVO.java

@@ -0,0 +1,23 @@
+package com.guwan.backend.pojo.response;
+
+import lombok.Data;
+
+import java.math.BigDecimal;
+
+@Data
+public class CourseCenterVO {
+    private String id;
+    private String title;
+    private String description;
+    private String levelId;
+    private String typeId;
+    private String categoryId;
+    private String coverImg;
+    private BigDecimal rating;
+    private Integer ratingCount;
+    private BigDecimal price;
+    private Integer studentCount;
+
+    private String teacher;
+
+}

src/main/java/com/guwan/backend/service/BSCategoryService.java

@@ -1,6 +1,6 @@
 package com.guwan.backend.service;
 
-import com.guwan.backend.pojo.dto.BSCategory;
+import com.guwan.backend.pojo.entity.BSCategory;
 import com.baomidou.mybatisplus.extension.service.IService;
 
 /**

src/main/java/com/guwan/backend/service/impl/BSCategoryServiceImpl.java

@@ -1,7 +1,7 @@
 package com.guwan.backend.service.impl;
 
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
-import com.guwan.backend.pojo.dto.BSCategory;
+import com.guwan.backend.pojo.entity.BSCategory;
 import com.guwan.backend.service.BSCategoryService;
 import com.guwan.backend.mapper.BSCategoryMapper;
 import org.springframework.stereotype.Service;