获取白页错误，在 REST API 中找不到我的问题？

Question

我正在构建一个REST API来访问数据库，并且遇到麻烦/持续出现白页错误。在圆圈中运行，试图在程序的流程或逻辑中找到我的错误和/或我的错误。这是我的应用程序：package com.skilldistillery.myRest;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.autoconfigure.domain.EntityScan;import org.springframework.boot.builder.SpringApplicationBuilder;import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;import org.springframework.context.annotation.ComponentScan;import org.springframework.data.jpa.repository.config.EnableJpaRepositories;@SpringBootApplication@ComponentScan(basePackages= {"com.skilldistillery.edgemarketing"})@EntityScan("com.skilldistillery.edgemarketing")@EnableJpaRepositories("com.skilldistillery.myRest.repositories")public class MyRestApplication extends SpringBootServletInitializer {    @Override    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {        return application.sources(MyRestApplication.class);    }    public static void main(String[] args) {        SpringApplication.run(MyRestApplication.class, args);    }}我的控制器：package com.skilldistillery.myRest.controllers;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.CrossOrigin;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import com.skilldistillery.edgemarketing.entities.House;import com.skilldistillery.myRest.services.HouseService;@RestController@RequestMapping("api") @CrossOrigin({ "*", "http://localhost:4200" })public class HouseController {    @Autowired     HouseService houseServ;     @GetMapping("index/{id}")    public House show(@PathVariable("id") Integer id) {        return houseServ.show(id);     }}它编译并启动，但通过邮递员和浏览器，我得到白页错误。我在互联网上搜索过，试图了解我哪里出了问题，但没有找到它。请指教。

Answer 1

您可以使用以下解决方案。将主类更改为以下代码

@SpringBootApplication

public class MyrestapplicationApplication  {

    public static void main(String[] args) {

        SpringApplication.run(MyrestapplicationApplication.class, args);

    }

}

然后为您的配置创建一个单独的类。以及摆脱紧密耦合的架构。

@Configuration

@EntityScan("com.skilldistillery.edgemarketing.entities")

@EnableJpaRepositories("com.skilldistillery.myRest.repositories")

public class BusinessConfig {

    @Bean

    public HouseService houseService(final HouseRepo houseRepo){

        return new HouseServiceImpl(houseRepo);

    }   

}

然后，您的控制器将更改为以下内容。利用依赖注入

@RestController

@RequestMapping("api") 

@CrossOrigin({ "*", "http://localhost:4200" })

public class HouseController {

   private   HouseService houseServ;

    public HouseController(HouseService houseServ) {

        this.houseServ = houseServ;

    }

    @GetMapping(value = "index/{id}",produces = MediaType.APPLICATION_JSON_VALUE,consumes = MediaType.APPLICATION_JSON_VALUE)

    public House show(@PathVariable("id") Integer id) {

        return houseServ.show(id); 

    }

}

家庭服务简单也应该实施家庭服务

public class HouseServiceImpl implements HouseService{

  private  HouseRepo hRepo;

    public HouseServiceImpl(HouseRepo hRepo) {

        this.hRepo = hRepo;

    }

    @Override

    public List<House> index() {

        return null;

    }

    public House show(Integer id) {

        Optional<House> opt = hRepo.findById(id); 

        House house = new House();

        if (opt.isPresent()) {

            house = opt.get();

        }

        return house;

    }

}

*注意 - 不要忘记删除以下配置，因为它们现在在类中处理。可以在类中定义更多 Bean@Autowired,@RepositoryBusinessConfigBusinessConfig