我正在構(gòu)建一個(gè)REST API來訪問數(shù)據(jù)庫，并且遇到麻煩/持續(xù)出現(xiàn)白頁錯(cuò)誤。在圓圈中運(yùn)行，試圖在程序的流程或邏輯中找到我的錯(cuò)誤和/或我的錯(cuò)誤。這是我的應(yīng)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); }}它編譯并啟動(dòng)，但通過郵遞員和瀏覽器，我得到白頁錯(cuò)誤。我在互聯(lián)網(wǎng)上搜索過，試圖了解我哪里出了問題，但沒有找到它。請(qǐng)指教。
1 回答
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您可以使用以下解決方案。將主類更改為以下代碼
@SpringBootApplication
public class MyrestapplicationApplication {
public static void main(String[] args) {
SpringApplication.run(MyrestapplicationApplication.class, args);
}
}
然后為您的配置創(chuàng)建一個(gè)單獨(dú)的類。以及擺脫緊密耦合的架構(gòu)。
@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，您的控制器將更改為以下內(nèi)容。利用依賴注入
@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);
}
}
家庭服務(wù)簡(jiǎn)單也應(yīng)該實(shí)施家庭服務(wù)
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 - 不要忘記刪除以下配置，因?yàn)樗鼈儸F(xiàn)在在類中處理。可以在類中定義更多 Bean@Autowired,@RepositoryBusinessConfigBusinessConfig
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