SpringBoot3 函数式web 小记

前言：函数式web是spring5.2之后的一个新特性，Spring Boot 3 进一步优化了这一模型，为开发现代 Web 应用提供了更加灵活、简洁的方法；

函数式web的四大核心对象

- RouterFunction：定义路由信息

- RequestPredicates：定义请求规则，包括请求参数、请求方式等

- ServerRequest：封装请求参数

- ServerResponse：封装响应参数

一、引包

 <parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>3.0.0</version></parent><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-tomcat</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies>

二、routerFunction配置类

import com.zc.handler.HostDiffHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.web.servlet.function.*;/*** @author zc* @date 2024/4/15 19:02* @desc*/
@Configuration
public class WebFunctionConfig {/*** 函数式编程* @param hostDiffHandler* @return*/@Beanpublic RouterFunction<ServerResponse> HostDiffRouter(HostDiffHandler hostDiffHandler){return RouterFunctions.route().GET("hostDiff/{id}", RequestPredicates.accept(MediaType.APPLICATION_JSON), hostDiffHandler::getHostDiff).POST("hostDiff/add", RequestPredicates.accept(MediaType.APPLICATION_JSON), hostDiffHandler::addHostDiff).PATCH("hostDiff/update", RequestPredicates.accept(MediaType.APPLICATION_JSON), hostDiffHandler::updateHostDiff).DELETE("hostDiff/{id}", hostDiffHandler::delHostDiff).build();}
}

三、handler 处理类

说明：这里的TestHostService 实现的是mybatis-plus 的IService 方式，请参考：Mybatis plus 实现IService方式，使用SpringbootTest引入service 测试_mybatisplus的iservice方法-CSDN博客

import com.zc.bean.HostDiffBean;
import com.zc.service.TestHostService;
import jakarta.servlet.ServletException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.servlet.function.ServerRequest;
import org.springframework.web.servlet.function.ServerResponse;import java.io.IOException;/*** @author zc* @date 2024/4/15 19:04* @desc*/
@Service
@Slf4j
public class HostDiffHandler {@Autowiredprivate TestHostService testHostService;/*** 获取* @param serverRequest* @return*/public ServerResponse getHostDiff(ServerRequest serverRequest){String id = serverRequest.pathVariable("id");return ServerResponse.ok().body(testHostService.getById(id));}/*** 新增* @param serverRequest* @return*/public ServerResponse addHostDiff(ServerRequest serverRequest) throws ServletException, IOException {testHostService.save(serverRequest.body(HostDiffBean.class));return ServerResponse.ok().build();}/*** 更新* @param serverRequest* @return*/public ServerResponse updateHostDiff(ServerRequest serverRequest) throws ServletException, IOException {testHostService.updateById(serverRequest.body(HostDiffBean.class));return ServerResponse.ok().build();}/*** 删除* @param serverRequest* @return*/public ServerResponse delHostDiff(ServerRequest serverRequest){testHostService.removeById(serverRequest.pathVariable("id"));return ServerResponse.ok().build();}
}