Spring MVC 处理异常

你的名字 2022-04-13 08:52 169阅读 0赞

# Spring MVC 处理异常 #

## 将异常映射为HTTP状态码 ##

### 映射前 ###

public class MyException extends RuntimeException {
    	private static final long serialVersionUID = 1L;
    }

--------------------

@Component
    @RequestMapping
    public class Controller {
    	@RequestMapping(value = "/exception", method = RequestMethod.GET)
    	public void exception() {
    		throw new MyException();
    	}
    }

--------------------

![vOTffyQ.png][]

### 映射后 ###

import org.springframework.http.HttpStatus;
    import org.springframework.web.bind.annotation.ResponseStatus;
    
    @ResponseStatus(value = HttpStatus.NOT_FOUND, reason = "404")
    public class MyException extends RuntimeException {
    	private static final long serialVersionUID = 1L;
    }

--------------------

Controller 类不变

--------------------

![jOqMagi.png][]

## 编写异常处理的方法 ##

import org.springframework.stereotype.Component;
    import org.springframework.web.bind.annotation.ExceptionHandler;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    
    @Component
    @RequestMapping
    public class Controller {
    	@RequestMapping(value = "/exception", method = RequestMethod.GET)
    	public void exception() {
    		throw new RuntimeException();
    	}
    
    	@ExceptionHandler(RuntimeException.class)
    	public String handleException() {
    		return "error.jsp";
    	}
    }

--------------------

![gbMbBYh.png][]

## 为控制器添加通知 ##

import org.springframework.web.bind.annotation.ControllerAdvice;
    import org.springframework.web.bind.annotation.ExceptionHandler;
    
    @ControllerAdvice
    public class Advice {
    	@ExceptionHandler(RuntimeException.class)
    	public String handleException() {
    		return "error.jsp";
    	}
    }

--------------------

import org.springframework.stereotype.Component;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    
    @Component
    @RequestMapping
    public class Controller {
    	@RequestMapping(value = "/exception", method = RequestMethod.GET)
    	public void exception() {
    		throw new RuntimeException();
    	}
    }

--------------------

与添加映射方法同样的效果

[vOTffyQ.png]: https://i.imgur.com/vOTffyQ.png
[jOqMagi.png]: https://i.imgur.com/jOqMagi.png
[gbMbBYh.png]: https://i.imgur.com/gbMbBYh.png