- 通过使用@RestControllerAdvice或@ControllerAdvice定义统一的异常处理类,而不是在每个Controller中逐个定义;
- @Restcontrolleradvice:返回json格式数据;
- @ControllerAdvice:返回视图类型数据;
- @ResponseBody:和controller方法上的用法一样,会将方法中的返回值转json后返回给客户端;
- @ExceptionHandler:用来定义函数针对的异常类型,最后将Exception对象和请求URL映射到返回结果中;用于注释异常处理类,value属性指定需要拦截的异常类型。
- 启动应用后,被 @ExceptionHandler、@InitBinder、@ModelAttribute 注解的方法,都会作用在 被 @RequestMapping 注解的方法上。
- 全局捕获异常的原理:使用AOP切面技术。
- 用@RequestBody,就解决了JSon自动绑定。
- 由于全局捕获异常使用的是AOP切面技术,需要导入aop的jar包
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
import com.terse.develop.utils.exception.AdminException;
import com.terse.develop.utils.exception.MsgResultException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.validation.BindException;
import org.springframework.validation.FieldError;
import org.springframework.web.HttpRequestMethodNotSupportedException;
import org.springframework.web.bind.ServletRequestBindingException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.method.annotation.MethodArgumentTypeMismatchException;
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import java.io.IOException;
import java.net.ConnectException;
import java.util.List;
import java.util.Set;
@RestControllerAdvice
@ResponseBody
public class ExceptionHandlerController {
private static final Logger logger = LoggerFactory.getLogger(ExceptionHandlerController1.class);
public static void print(Exception ex) {
logger.error(ex.toString());
ex.printStackTrace();
}
@ExceptionHandler(value = HttpRequestMethodNotSupportedException.class)
public Exception HttpRequestMethodNotSupportedException(HttpRequestMethodNotSupportedException e) {
print(e);
return new Exception("Http请求方式不支持");
}
@ExceptionHandler(value = {MsgResultException.class, AdminException.class})
public Exception exception(Exception e) {
print(e);
if (e instanceof MsgResultException)
return new MsgResultException(((MsgResultException) e).getMsg());
else
return new AdminException("请重试");
}
@ExceptionHandler(value = HttpMessageNotReadableException.class)
public Exception httpMessageNotReadableException(HttpMessageNotReadableException e) {
print(e);
return new Exception("请检查数据是否正确");
}
@ExceptionHandler(value = MethodArgumentTypeMismatchException.class)
public Exception getNumberException(MethodArgumentTypeMismatchException e) {
print(e);
return new Exception("String类型不能转换成数字类型");
}
@ExceptionHandler(value = ConstraintViolationException.class)
public Exception ConstraintViolationExceptionHandler(ConstraintViolationException ex) {
Set<ConstraintViolation<?>> constraintViolations = ex.getConstraintViolations();
String msg = null;
for (ConstraintViolation<?> cvl : constraintViolations) {
msg = cvl.getMessageTemplate();
}
logger.error(msg);
return new Exception(msg);
}
@ExceptionHandler(value = ServletRequestBindingException.class)
public Exception ServletRequestBindingException(ServletRequestBindingException e) {
print(e);
return new Exception("缺少参数");
}
@ExceptionHandler(value = BindException.class)
public Exception BindExceptionHandler(BindException bindException) {
List<FieldError> fieldErrors = bindException.getFieldErrors();
String msg = null;
for (FieldError fieldError : fieldErrors) {
msg = fieldError.getDefaultMessage();
}
return new Exception(msg);
}
@ExceptionHandler(value = ConnectException.class)
public Exception connectException(ConnectException e) {
print(e);
return new Exception("服务器异常,请联系管理员");
}
@ExceptionHandler(value = IOException.class)
public Exception ioException(IOException e) {
e.printStackTrace();
return new Exception("IO流处理异常,请联系管理员");
}
}