spring参数类型异常输出，SpringMvc参数类型转换错误输出

spring参数类型异常输出，

SpringMvc参数类型转换错误输出

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蕃薯耀 2016年6月6日 17:01:47 星期一

http://fanshuyao.iteye.com/

有一种更加方便的方法，可以全局使用，详情见：http://fanshuyao.iteye.com/blog/2303366

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，如下面的例子

@RequestMapping("/test")
	public String test(int i){
		System.out.println(i);
		int a = 2/0;
		throw new RuntimeException("出错了！");
	}

http://localhost:8080/project/test?i=a

参数i是整型，但我在请求时是一个字符串a，出错后显示的页面如下：

一般情况是知道的，但如果在参数是对象（如User user）的情况下，如果类型转换出错，就很难知道了。

二、解决方法：

在对应的方法加上如下注解：

@ExceptionHandler({TypeMismatchException.class })

如下面的例子所示：

@RequestMapping("/test")
	@ExceptionHandler({TypeMismatchException.class })
	public String test(int i){
		System.out.println(i);
		int a = 2/0;
		throw new RuntimeException("出错了！");
	}

再请求时，就会在控制台输出错误信息

java.lang.IllegalStateException: No suitable resolver for argument [0] [type=int]
HandlerMethod details:
Controller [com.chinagas.biz.controller.ExceptionController]
Method [public java.lang.String com.chinagas.biz.controller.ExceptionController.test(int)]

	at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:175)
	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.ExceptionHandlerExceptionResolver.doResolveHandlerMethodException(ExceptionHandlerExceptionResolver.java:362)
	at org.springframework.web.servlet.handler.AbstractHandlerMethodExceptionResolver.doResolveException(AbstractHandlerMethodExceptionResolver.java:60)
	at org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:138)
	at org.springframework.web.servlet.DispatcherServlet.processHandlerException(DispatcherServlet.java:1167)
	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1004)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955)
	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:318)
	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)

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蕃薯耀 2016年6月6日 17:01:47 星期一

http://fanshuyao.iteye.com/