java在使用spring引导时无法访问REST API
所以我刚刚开始使用SpringBoot，我尝试实现一个crud服务。我的代码主要来自本教程Spring Boot Rest API Example，我只是更改了变量名。 我解决了启动spring boot等的所有问题，但现在我无法访问本地主机上的api。我希望有人能帮我：）
我的申请书。爪哇
package demo.app;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication(scanBasePackages= {"demo"})
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}
我的模型游戏。爪哇：
package demo.model;
public class Game {
private long id;
private String name;
private String genre;
private String studio;
private String publisher;
public Game(long id, String name, String genre, String studio, String publisher) {
this.id = id;
this.name = name;
this.genre = genre;
this.studio = studio;
this.publisher = publisher;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGenre() {
return genre;
}
public void setGenre(String genre) {
this.genre = genre;
}
public String getStudio() {
return studio;
}
public void setStudio(String studio) {
this.studio = studio;
}
public String getPublisher() {
return publisher;
}
public void setPublisher(String publisher) {
this.publisher = publisher;
}
@Override
public String toString() {
return "Game [id=" + id + ", name=" + name + ", genre=" + genre + ", studio=" + studio + ", publisher="
+ publisher + "]";
}
}
Api控制器重新启动PicController。爪哇
package demo.app.controller;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.util.UriComponentsBuilder;
import demo.model.Game;
import demo.service.GameService;
import demo.util.CostumErrorType;
@RestController
@RequestMapping("/api")
public class RestApiController {
public static final Logger logger = LoggerFactory.getLogger(RestApiController.class);
@Autowired
GameService gameService; // Service which will do all data retrieval/manipulation work
//---------------Retrieve all games---------------------------------
@RequestMapping(value = "/game/", method = RequestMethod.GET)
public ResponseEntity<List<Game>> listAllGames() {
List<Game> games = gameService.findAllGames();
if(games.isEmpty()) {
return new ResponseEntity(HttpStatus.NO_CONTENT);
//TODO: vllt in HttpStatus.NOT_FOUND ändern
}
return new ResponseEntity<List<Game>>(games, HttpStatus.OK);
}
//---------------Retrieve Single Game---------------------------------
@RequestMapping(value = "/game/{id}", method = RequestMethod.GET)
public ResponseEntity<?> getGame(@PathVariable("id") long id) {
logger.info("Fetching User with id {}", id);
Game game = gameService.findById(id);
if(game == null) {
logger.error("Game with id {} not found.", id);
return new ResponseEntity(new CostumErrorType("Game with id " + id + " not found"), HttpStatus.NOT_FOUND);
}
return new ResponseEntity<Game>(game, HttpStatus.OK);
}
//---------------Create a Game---------------------------------
@RequestMapping(value= "/game/", method = RequestMethod.POST)
public ResponseEntity<?> createGame(@RequestBody Game game, UriComponentsBuilder ucBuilder){
logger.info("Creating Game: {}", game);
if(gameService.isGameExist(game)) {
logger.error("Unable to create. A Game with name {} already exists.", game.getName());
return new ResponseEntity(new CostumErrorType("Unable to create. A Game with name " + game.getName() + "already exists."), HttpStatus.CONFLICT);
}
gameService.saveGame(game);
HttpHeaders headers = new HttpHeaders();
headers.setLocation(ucBuilder.path("/api/game/{id}").buildAndExpand(game.getId()).toUri());
return new ResponseEntity<String>(headers, HttpStatus.CREATED);
}
}
服务接口提供服务。爪哇：
package demo.service;
import java.util.List;
import demo.model.Game;
public interface GameService {
Game findById(long id);
Game findByName(String name);
void saveGame(Game game);
void updateGame(Game game);
void deleteGameByName(String name);
List<Game> findAllGames();
void deleteAllGames();
boolean isGameExist(Game game);
}
it GameServiceImpl的实现。爪哇：
package demo.service;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;
import org.springframework.stereotype.Service;
import demo.model.Game;
@Service("gameService")
public class GameServiceImpl implements GameService{
private static final AtomicLong counter = new AtomicLong();
private static List<Game> games;
static {
games = populateDummyGames();
}
public List<Game> findAllGames(){
return games;
}
public Game findById(long id) {
for(Game game : games) {
if(game.getId() == id) {
return game;
}
}
return null;
}
public Game findByName(String name) {
for(Game game : games) {
if(game.getName().equalsIgnoreCase(name)) {
return game;
}
}
return null;
}
public void saveGame(Game game) {
game.setId(counter.incrementAndGet());
games.add(game);
}
public void updateGame(Game game) {
int index = games.indexOf(game);
games.set(index, game);
}
public void deleteGameById(long id) {
for (Iterator<Game> iterator = games.iterator(); iterator.hasNext();) {
Game game = iterator.next();
if (game.getId() == id) {
iterator.remove();
}
}
}
public void deleteGameByName(String name) {
for (Iterator<Game> iterator = games.iterator(); iterator.hasNext();) {
Game game = iterator.next();
if (game.getName().equalsIgnoreCase(name)) {
iterator.remove();
}
}
}
public boolean isGameExist(Game game) {
return findByName(game.getName())!=null;
}
public void deleteAllGames() {
games.clear();
}
private static List<Game> populateDummyGames(){
List<Game> games = new ArrayList<Game>();
games.add(new Game(counter.incrementAndGet(), "The Elder Scrolls V: Skyrim", "RPG", "Bethesda Game Studios", "Bethesda"));
games.add(new Game(counter.incrementAndGet(), "Halo: Combat Evolved", "First-Person-Shooter", "Bungie", "Microsoft"));
games.add(new Game(counter.incrementAndGet(), "Doom", "First-Person-Shooter", "ID-Studios", "Bethesda"));
return games;
}
}
在我启动SpringBoot应用程序并通过curl向localhost:8080发送请求后，没有指向我的api的链接
编辑 我忘了包括我的pom。xml文件。也许这与问题有关：
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.7.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
编辑：
我想出来了。。。我觉得有点傻。
在RestApiController中。java中，第一个方法的RequestMapping设置为
/game/
这对我来说毫无意义。所以我只尝试通过localhost:8080/api/game访问它。当通过localhost:8080/api/game/访问时，它可以正常工作。。对不起，伙计们。。但是谢谢你的帮助
# 1 楼答案
我认为问题在于：
试着把它改成
或者
通过@EnableAutoConfiguration，spring将自动配置您需要的bean