spring boot——请求与参数校验——重要概念——异常处理——@ControllerAdvice注解...

喜欢ヅ旅行 2023-09-29 00:28 12阅读 0赞

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PS，访问资源，引入如下：

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-thymeleaf</artifactId>
            </dependency>

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自定义注解：

package org.example.Exception;
    
    public class MyException extends Exception
    {
    
        private static final long serialVersionUID = 1L;
    
    
        public MyException()
        {
    
            super();
        }
    
    
        public MyException(String message)
        {
    
            super(message);
        }
    }

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设置全局异常类：

package org.example.controller.GlobalExceptionHandler;
    
    import org.example.Exception.MyException;
    import org.springframework.web.bind.annotation.ControllerAdvice;
    import org.springframework.web.bind.annotation.ExceptionHandler;
    import java.sql.SQLException;
    
    @ControllerAdvice
    public class GlobalExceptionHandlerController
    {
        @ExceptionHandler(value=Exception.class)
        public String handlerException(Exception e)
        {
            //数据库异常
            if (e instanceof SQLException)
            {
    
                System.out.println(e.getMessage());
    
                return "sqlError";
            }
            else if (e instanceof MyException)   //自定义异常
            {
    
                return "myError";
            }
            else          //未知异常
            {
                return "noError";
            }
        }
    }

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设置controller，用于访问并引发异常：

package org.example.controller.GlobalExceptionHandler;
    
    import org.example.Exception.MyException;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    import java.sql.SQLException;
    
    @Controller
    public class HandleExceptionController
    {
        @RequestMapping("/f123")
        public String index()
        {
    
            return "index";
        }
    
        @RequestMapping("/db")
        public void db() throws SQLException
        {
    
            throw new SQLException("数据库异常");
        }
    
        @RequestMapping("/my")
        public void my() throws MyException
        {
    
            throw new MyException("自定义异常");
        }
    
        @RequestMapping("/no")
        public void no() throws Exception
        {
    
            throw new Exception("未知异常");
        }
    }

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