java - 为我的所有 REST 控制器方法请求添加 @Around 建议后，不要返回任何 JSON 数据

Question

我已经实现了 REST 控制器方法，并且在没有实现方面时它们可以正常工作。在我实现方面之后，控制器方法仍然在后台执行良好（即 DELETE 请求实际上删除了条目），但是当我使用 Postman 测试响应时，我没有得到任何响应。方面确实有效，并且在调用方法时会更新 txt 文件。

@RestController
public class MovieScreeningREST {

@Autowired
private MovieScreeningService movieScreeningService;


@GetMapping("/movies")
public List<MovieScreening> findAll(){
    return movieScreeningService.findAll();
}

@GetMapping("/movies/genre={movieGenre}")
public List<MovieScreening> findAllByMovieGenre(@PathVariable String movieGenre){
    return movieScreeningService.findAllByMovieGenre(movieGenre);
}

@GetMapping("/movies/minimum-tickets={amount}")
public List<MovieScreening> findAllByTicketsSoldGreaterThanEqual(@PathVariable int amount){
    return movieScreeningService.findAllByTicketsSoldGreaterThanEqual(amount);
}

@GetMapping("/movies/maximum-screenings={amount}")
public List<MovieScreening> findAllByScreeningsNumberLessThanEqual(@PathVariable int amount){
    return movieScreeningService.findAllByScreeningsNumberLessThanEqual(amount);
}

@GetMapping("/movies/id={id}")
public MovieScreening findById(@PathVariable int id){
    return movieScreeningService.findById(id);
}

@PostMapping("/movies")
public MovieScreening addMovieScreening(@RequestBody MovieScreening movieScreening){
    return movieScreeningService.save(movieScreening);
}


@PutMapping("/movies")
public MovieScreening editMovieScreening(@RequestBody MovieScreening movieScreening){
    return movieScreeningService.save(movieScreening);
}

@DeleteMapping("/movies/id={id}")
public String deleteMovieScreening(@PathVariable int id){
    return movieScreeningService.deleteById(id);
}

}

方面类

@EnableAspectJAutoProxy
@Aspect
@Component
public class Logger {

@Pointcut("execution(* asss.pj.projekat_bioskop.controller.*.*(..))")
public void allRESTMethods(){};


@Around("allRESTMethods()")
public void blabla(ProceedingJoinPoint pjp) {
    //@Before
    String methodName = pjp.getSignature().getName();
    String before = "*** Attempting " + methodName + " method ***";
    writeLog(before);

    try {
        //@AfterReturning
        pjp.proceed();

        String success = "\n*** Method " + methodName + " has succeeded";
        writeLog(success);
    } catch (Throwable throwable){
        //@AfterThrowing
        String failed = "\n*** Method " + methodName
                + " has failed. " + throwable.getMessage() + " .***";
        writeLog(failed);
    }

    //@After
    String after = "\n";
    writeLog(after);
}


public void writeLog(String log){

    File file = new File("filmovi_izvestaj.txt");
    try (Writer wr = new FileWriter(file, true)){
        wr.write(log);
    } catch(FileNotFoundException fe){
        fe.printStackTrace();
    } catch(IOException ioe){
        ioe.printStackTrace();
    }
}

}

邮差

标签： javaspringspring-bootspring-aopspring-rest

Answer 1

@Around 建议

around 通知返回的值是方法调用者看到的返回值。

您的建议没有返回任何阻止调用方法获取实际返回值的内容。修改您的环绕建议方法以返回Object以正确完成流程。

例子

@Around("allRESTMethods()")
public Object blabla(ProceedingJoinPoint pjp) {
    //@Before
    String methodName = pjp.getSignature().getName();
    String before = "*** Attempting " + methodName + " method ***";
    writeLog(before);
    Object retVal = null;
    try {
        //@AfterReturning
       retVal = pjp.proceed();

        String success = "\n*** Method " + methodName + " has succeeded";
        writeLog(success);
    } catch (Throwable throwable){
        //@AfterThrowing
        String failed = "\n*** Method " + methodName
                + " has failed. " + throwable.getMessage() + " .***";
        writeLog(failed);
    }

    //@After
    String after = "\n";
    writeLog(after);
    return retVal;
}