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跟杨春娟学SpringBoot笔记：全局异常处理之SimpleMappingExceptionResolver

完成：第一遍

1.如何使用SimpleMappingExceptionResolver？

步骤一:创建MySimpleMappingExceptionResolver.java

MySimpleMappingExceptionResolver.java

package com.springboot.demo.SpringBootDemoProject.error;import java.util.Properties;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.handler.SimpleMappingExceptionResolver;//@Configurationpublic class MySimpleMappingExceptionResolver {
   		@Bean	public SimpleMappingExceptionResolver getSimpleMappingExceptionResolver() {
   		SimpleMappingExceptionResolver simpleMappingExceptionResolver = new SimpleMappingExceptionResolver();		Properties properties = new Properties();		properties.put("java.lang.NullPointerException", "error/error_null");		simpleMappingExceptionResolver.setDefaultErrorView("error/error_other");		simpleMappingExceptionResolver.setExceptionMappings(properties);		return simpleMappingExceptionResolver;	}}

步骤二：创建ErrorTestController.java

ErrorTestController.java

package com.springboot.demo.SpringBootDemoProject.error;import org.springframework.stereotype.Controller;import org.springframework.ui.ModelMap;import org.springframework.web.bind.annotation.RequestMapping;@Controller@RequestMapping("e")public class ErrorTestController {
   	@RequestMapping("show")	public String show(ModelMap model) {
   				 String str = null; 		 str.charAt(0);		 		return "thymeleaf";	}}

2.MySimpleMappingExceptionResolver和MyExceptionHandler在启动时间有什么不同之处？

不同之处：

而MyExceptionHandler启动时间在每次url访问的时候启动

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