Spring MVC的三种异常处理方式实例详解

<!--配置简单异常处理器-->
<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    <!-- 异常捕获后动作：展示视图 -->
    <property name="defaultErrorView" value="/error.html"/>
</bean

<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    <property name="defaultErrorView" value="/error.html"/>
    <property name="exceptionMappings">
        <props>
            <!-- 配置异常类型对应的展示视图 -->
            <prop key="java.lang.RuntimeException">/error.html</prop>
            <prop key="java.io.FileNotFoundException">/io.html</prop>
        </props>
    </property>
</bean> 

@Bean
public SimpleMappingExceptionResolver simpleMappingExceptionResolver(){
    //创建SimpleMappingExceptionResolver
    SimpleMappingExceptionResolver resolver = new SimpleMappingExceptionResolver();
    //设置默认错误展示视图
    resolver.setDefaultErrorView("/error.html");
    //定义Properties设置特殊异常对应的映射视图
    Properties properties = new Properties();
    properties.setProperty("java.lang.RuntimeException","/error.html");
    properties.setProperty("java.io.FileNotFoundException","/io.html");
    resolver.setExceptionMappings(properties);
    return resolver;
}

public class MyHandlerExceptionResolver implements HandlerExceptionResolver {
    @Override
    //参数Object是当前目标方法处理器对象HandlerMethod
    public ModelAndView resolveException(HttpServletRequest httpServletRequest, 
                                         HttpServletResponse httpServletResponse, Object o, Exception e) {
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("/error.html");
        return modelAndView;
    }
}

<bean class="com.fly.exception.MyHandlerExceptionResolver"></bean>

@Component
public class MyHandlerExceptionResolver implements HandlerExceptionResolver {
    @Override
    public ModelAndView resolveException(HttpServletRequest httpServletRequest, 
                                         HttpServletResponse httpServletResponse, Object o, Exception e) {
        //编写要返回的json格式的字符串
        String jsonStr = "{\"code\":0,\"message\":\"error\",\"data\":\"\"}";
        try {
            httpServletResponse.getWriter().write(jsonStr);
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        return null;
    }
}

@ControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler(RuntimeException.class)
    public ModelAndView runtimeHandleException(RuntimeException e){
        System.out.println("全局异常处理器执行...."+e);
        ModelAndView modelAndView = new ModelAndView("/error.html");
        return modelAndView;
    }
    @ExceptionHandler(IOException.class)
    @ResponseBody
    public ResultInfo ioHandleException(IOException e){
        //模拟一个ResultInfo
        ResultInfo resultInfo = new ResultInfo(0,"IOException",null);
        return resultInfo;
    }
}

@RestControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler(RuntimeException.class)
    public ResultInfo runtimeHandleException(RuntimeException e){
        //模拟一个ResultInfo
        ResultInfo resultInfo = new ResultInfo(0,"RuntimeException",null);
        return resultInfo;
    }
    @ExceptionHandler(IOException.class)
    public ResultInfo ioHandleException(IOException e){
        //模拟一个ResultInfo
        ResultInfo resultInfo = new ResultInfo(0,"IOException",null);
        return resultInfo;
    }
}