Spring+Spring MVC+Spring boot学习汇总

ゝ一纸荒年。 2021-09-27 16:54 319阅读 0赞

SSH（Spring+Struts+Hibernate）

SSM（Spring+Spring MVC+Mybatis）

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## @ControllerAdvice ##

*  `@ControllerAdvice`是一个`@Component`，用于定义`@ExceptionHandler`，`@InitBinder`和`@ModelAttribute`方法，适用于所有使用`@RequestMapping`方法。
 *  Spring4之前，`@ControllerAdvice`在同一调度的Servlet中协助所有控制器。Spring4已经改变：`@ControllerAdvice`支持配置控制器的子集，而默认的行为仍然可以利用。
 *  在Spring4中， `@ControllerAdvice`通过`annotations()`, `basePackageClasses()`, `basePackages()`方法定制用于选择控制器子集。

不过据经验之谈，只有配合`@ExceptionHandler`最有用，其它两个不常用。

![è¿éåå¾çæè¿°][20170526111946338]

如果单使用@ExceptionHandler，只能在当前Controller中处理异常。但当配合@ControllerAdvice一起使用的时候，就可以摆脱那个限制了。

package com.somnus.advice;
     
    import org.springframework.web.bind.annotation.ControllerAdvice;
    import org.springframework.web.bind.annotation.ExceptionHandler;
    import org.springframework.web.bind.annotation.ResponseBody;
     
    @ControllerAdvice
    public class ExceptionAdvice {
     
    @ExceptionHandler({ ArrayIndexOutOfBoundsException.class })
    @ResponseBody
    public String handleArrayIndexOutOfBoundsException(Exception e) {
    e.printStackTrace();
    return "testArrayIndexOutOfBoundsException";
    }
     
    }

@Controller
    @RequestMapping(value = "exception")
    public class ExceptionHandlerController {
     
    @RequestMapping(value = "e2/{id}", method = { RequestMethod.GET })
    @ResponseBody
    public String testExceptionHandle2(@PathVariable(value = "id") Integer id) {
    List<String> list = Arrays.asList(new String[]{"a","b","c","d"});
    return list.get(id-1);
    }
     
    }

当我们访问`http://localhost:8080/SpringMVC/exception/e2/5`的时候会抛出`ArrayIndexOutOfBoundsException`异常，这时候定义在`@ControllerAdvice`中的`@ExceptionHandler`就开始发挥作用了。

总结：[@*ControllerAdvice* + @ExceptionHandler 全局处理 Controller 层异常 ][ControllerAdvice_ _ExceptionHandler _ Controller]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2M4NTEyMDQyOTM_size_16_color_FFFFFF_t_70]: /images/20210923/372e3faaa31748b8b9a338a771f0df71.png
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[20170526111946338]: /images/20210923/a8944530745141d490fcc2fcaa1151d3.png
[ControllerAdvice_ _ExceptionHandler _ Controller]: https://blog.csdn.net/kinginblue/article/details/70186586