spring参数类型异常输出（二）， SpringMvc参数类型转换错误输出（二）

spring参数类型异常输出（二），

SpringMvc参数类型转换错误输出（二）

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蕃薯耀 2016年6月6日 17:58:30 星期一

http://fanshuyao.iteye.com/

一、问题描述

一般情况下，Spring对于方法接收参数的错误是没有提示的，而是直接输入到一个错误的页面，但从错误页面是看不出到底是什么错。

详细请看：http://fanshuyao.iteye.com/blog/2303357

二、解决方案

之前已经有一种注解的方法，在方法加上注解：

@ExceptionHandler({TypeMismatchException.class })

详情见：http://fanshuyao.iteye.com/blog/2303357

现在介绍另外一种方法：

1、通过继承：DefaultHandlerExceptionResolver，重写方法resolveException

public class MyExceptionHandler extends DefaultHandlerExceptionResolver {

	@Override
	public ModelAndView resolveException(HttpServletRequest request,
			HttpServletResponse response, Object handler, Exception ex) {
		ModelAndView mav = new ModelAndView("errors/error");
		mav.addObject("ex", ex);
		ex.printStackTrace();

		if(ex instanceof TypeMismatchException){
			mav.setViewName("errors/typeMismatch");
			return mav;
		}
		if(ex instanceof Exception){
			return mav;
		}
		return mav;
	}

}

2、在springMvc文件配置MyExceptionHandler

<bean id="exceptionHandler" class="com.chinagas.basic.exception.MyExceptionHandler" p:order="1"></bean>

需要注意的是：一定是加上p:order="1"，不然也会没有效果

p标签需要引入命名空间：

xmlns:p="http://www.springframework.org/schema/p"

Eclipse添加方法：

直接选择，然后保存就添加进去。

测试：

@RequestMapping("/test")
	public String test(int i) throws Exception{
		System.out.println(i);
		int a = 2/i;
		throw new RuntimeException("出错了！");
	}

请求上面的方法：http://localhost:8080/zrbboss/ex/test?i=a，这里的i的值是a，但方法接收的整型，类型转换错误。

然后再看控制台，打印出错误信息了：

org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'int'; nested exception is java.lang.NumberFormatException: For input string: "a"
	at org.springframework.beans.TypeConverterSupport.doConvert(TypeConverterSupport.java:77)
	at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:47)
	at org.springframework.validation.DataBinder.convertIfNecessary(DataBinder.java:603)
	at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:104)
	at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:77)[16/06/06 18:09:47:206][com.chinagas.common.utils.UserAuthInterceptor-preHandle] request url is ==/zrbboss/ex/test

	at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:162)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:129)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:777)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:706)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NumberFormatException: For input string: "a"
	at java.lang.NumberFormatException.forInputString(Unknown Source)
	at java.lang.Integer.parseInt(Unknown Source)
	at java.lang.Integer.valueOf(Unknown Source)
	at org.springframework.util.NumberUtils.parseNumber(NumberUtils.java:193)
	at org.springframework.beans.propertyeditors.CustomNumberEditor.setAsText(CustomNumberEditor.java:113)
	at org.springframework.beans.TypeConverterDelegate.doConvertTextValue(TypeConverterDelegate.java:450)
	at org.springframework.beans.TypeConverterDelegate.doConvertValue(TypeConverterDelegate.java:423)
	at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:195)
	at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:107)
	at org.springframework.beans.TypeConverterSupport.doConvert(TypeConverterSupport.java:64)
	... 38 more

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蕃薯耀 2016年6月6日 17:58:30 星期一

http://fanshuyao.iteye.com/