本篇文章的主要内容是关于项目的跨域配置和给项目添加restful风格接口。
重点是文件粘贴

一、 跨域

跨域问题暂时也就那样，解决方法就是复制粘贴一个不知道从哪里来的CorsConfig文件，这样就可以解决问题：

import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.context.annotation.Configuration;import java.io.IOException;/*** @author oyan* @date 2024/5/22 17:20* @description CorsConfig*/
@Configuration
public class CorsConfig implements Filter {@Overridepublic void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {HttpServletResponse response = (HttpServletResponse) res;HttpServletRequest request = (HttpServletRequest) req;String origin = request.getHeader("Origin");if(origin!=null) {response.setHeader("Access-Control-Allow-Origin", origin);}String headers = request.getHeader("Access-Control-Request-Headers");if(headers!=null) {response.setHeader("Access-Control-Allow-Headers", headers);response.setHeader("Access-Control-Expose-Headers", headers);}response.setHeader("Access-Control-Allow-Methods", "*");response.setHeader("Access-Control-Max-Age", "3600");response.setHeader("Access-Control-Allow-Credentials", "true");chain.doFilter(request, response);}@Overridepublic void init(FilterConfig filterConfig) {}@Overridepublic void destroy() {}
}

二、Restful风格

1. 什么是restful风格？

其实就是长这个样的：

就是返回的参数是这样的，很规整的。

2. 项目文件结构

接下来是这样的结构，你需要新建如下的包

3. 新建文件

新建枚举CodeEnum

/*** @author oyan* @date 2024/5/22 17:23* @description 枚举*/
public enum CodeEnum {SUCCESS(200,"操作成功"),ERROR(400,"error"),TOKEN_NULL(403,"token不存在"),USER_INFO_ERROR(405,"用户信息错误"),FAIL_APPLY(407,"请求失败"),ROLE_ERROR(406,"角色错误"),TOKEN_ILLEGAL(408,"token不合法");int code;String msg;CodeEnum(int code, String message){this.code=code;this.msg=message;}public int getCode(){return code;}public String getMsg(){return msg;}public String toString(){return "\"{code\":\""+ this.code +"\","+"\"msg\":\""+ this.msg+"\"}";}
}

新建记录Rest

/*** @author Administrator* @date 2024/5/22 17:25* @description Rest restful风格的结果*/
public record Rest<T>(int code, String message, T data) {public static <T> Rest<T> success(T data){return new Rest<>(CodeEnum.SUCCESS.getCode(),CodeEnum.SUCCESS.getMsg(),data);}public static <T> Rest<T> success(){return new Rest<>(CodeEnum.SUCCESS.getCode(), CodeEnum.SUCCESS.getMsg(), null);}public static <T> Rest<T> success(String msg){return new Rest<>(CodeEnum.SUCCESS.getCode(), msg,null);}public static <T> Rest<T> failure(CodeEnum codeEnum){return new Rest<>(codeEnum.getCode(),codeEnum.getMsg(),null);}public static <T> Rest<T> failure(String msg){return new Rest<>(400,msg,null);}
}

4. 在Controller中进行修改

以CategoryController为例：

@RestController
@RequestMapping("/category")
public class CategoryController {@Autowiredprivate CategoryService categoryService;@GetMapping("/all")public Rest findAll() {try{return Rest.success(categoryService.findAll());}catch (Exception e){return Rest.failure(e.getMessage());}}@PostMapping("/input")public Rest insert(@RequestParam("name") String name, @RequestParam("parentCategory") Integer parentCategory, @RequestParam("level") Integer level) {System.out.println(name+parentCategory+level);Category category = new Category();category.setName(name);category.setParentCategory(parentCategory);category.setLevel(level);try {categoryService.insert(category);return Rest.success();}catch(Exception e) {return Rest.failure(e.getMessage());}}@PostMapping("/delete")public Rest delete(@RequestParam("id") Integer id) {try {categoryService.delete(id);return Rest.success();}catch (Exception e){return Rest.failure(e.getMessage());}}@PostMapping("/find")public Rest getCategoryById(@RequestParam("id") Integer id) {try {Category category = categoryService.getCategoryById(id);if(category == null){return Rest.failure("查询结果为空/编号不存在");}return Rest.success(category);}catch (Exception e){return Rest.failure(e.getMessage());}}}