SpringBoot3 函数式web 小记

说明：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
     */
    @Bean
    public 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 {

    @Autowired
    private 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();
    }
}