统一异常处理

统一异常处理类

package common.exception;

import common.result.R;
import common.result.ResponseEnum;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.ConversionNotSupportedException;
import org.springframework.beans.TypeMismatchException;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.http.converter.HttpMessageNotWritableException;
import org.springframework.jdbc.BadSqlGrammarException;
import org.springframework.stereotype.Component;
import org.springframework.web.HttpMediaTypeNotAcceptableException;
import org.springframework.web.HttpMediaTypeNotSupportedException;
import org.springframework.web.HttpRequestMethodNotSupportedException;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.MissingPathVariableException;
import org.springframework.web.bind.MissingServletRequestParameterException;
import org.springframework.web.bind.ServletRequestBindingException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.context.request.async.AsyncRequestTimeoutException;
import org.springframework.web.multipart.support.MissingServletRequestPartException;
import org.springframework.web.servlet.NoHandlerFoundException;

@Slf4j
@Component
@RestControllerAdvice
public class UnifiedExceptionHandler {

    /**
     * 未定义异常
     */
    @ExceptionHandler(value = Exception.class)
    public R handleException(Exception e) {
        log.error(e.getMessage(), e);
        return R.error();
    }

    @ExceptionHandler(BadSqlGrammarException.class)
    public R handleBadSqlGrammarException(BadSqlGrammarException e){
        log.error(e.getMessage(),e);
        return R.setResult(ResponseEnum.BAD_SQL_GRAMMAR_ERROR);
    }

    @ExceptionHandler(BusinessException.class)
    public R handleBusinessException(BusinessException e){
        log.error(e.getMessage(),e);
        return R.error().message(e.getMessage()).code(e.getCode());
    }

    /**
     * Controller上一层相关异常
     */
    @ExceptionHandler(value = {
            NoHandlerFoundException.class,
            HttpRequestMethodNotSupportedException.class,
            HttpMediaTypeNotSupportedException.class,
            MissingPathVariableException.class,
            MissingServletRequestParameterException.class,
            TypeMismatchException.class,
            HttpMessageNotReadableException.class,
            HttpMessageNotWritableException.class,
            MethodArgumentNotValidException.class,
            HttpMediaTypeNotAcceptableException.class,
            ServletRequestBindingException.class,
            ConversionNotSupportedException.class,
            MissingServletRequestPartException.class,
            AsyncRequestTimeoutException.class
    })
    public R handleServletException(Exception e) {
        log.error(e.getMessage(), e);
        //SERVLET_ERROR(-102, "servlet请求异常"),
        return R.error().message(ResponseEnum.SERVLET_ERROR.getMessage()).code(ResponseEnum.SERVLET_ERROR.getCode());
    }

}

在spring 3.2中，新增了@ControllerAdvice 注解，可以用于定义@ExceptionHandler、@InitBinder、@ModelAttribute，并应用到所有@RequestMapping中

同时扫描器中需要增加@ComponentScan 含义该类的包

对于很多异常,需要处理,经常需要通过if else 判断来实现,以及异常处理通过 throw 抛出,因此需要统一的断言类来优化异常HTT

package common.exception;

import common.result.ResponseEnum;
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class Assert {

    public static void notNull(Object o, ResponseEnum responseEnum){
        if (o == null){
            log.info("obj is null ... ");
            throw new BusinessException(responseEnum);
        }
    }
}