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学习自定义类型转换器值，当输入的类型 和自定义的类型不一致是会报
convertFromString....java.text.ParseException: Format.parseObject(String) failed at java.text.Format.parseObject(Format.java:245) at com.baidu.action.conversion.DateConverter.convertFromString(DateConverter.java:44) at org.apache.struts2.util.StrutsTypeConverter.convertValue(StrutsTypeConverter.java:52) at com.opensymphony.xwork2.conversion.impl.DefaultTypeConverter.convertValue(DefaultTypeConverter.java:92) at com.opensymphony.xwork2.conversion.impl.XWorkConverter.convertValue(XWorkConverter.java:314) at com.opensymphony.xwork2.ognl.OgnlTypeConverterWrapper.convertValue(OgnlTypeConverterWrapper.java:39) at ognl.OgnlRuntime.getConvertedType(OgnlRuntime.java:1081) at ognl.OgnlRuntime.getConvertedTypes(OgnlRuntime.java:1098) at ognl.OgnlRuntime.getConvertedMethodAndArgs(OgnlRuntime.java:1124) at ognl.OgnlRuntime.getAppropriateMethod(OgnlRuntime.java:1210) at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1224) at ognl.OgnlRuntime.setMethodValue(OgnlRuntime.java:1503) at ognl.ObjectPropertyAccessor.setPossibleProperty(ObjectPropertyAccessor.java:85) at ognl.ObjectPropertyAccessor.setProperty(ObjectPropertyAccessor.java:162) at com.opensymphony.xwork2.ognl.accessor.ObjectAccessor.setProperty(ObjectAccessor.java:27) at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:2432) at com.opensymphony.xwork2.ognl.accessor.CompoundRootAccessor.setProperty(CompoundRootAccessor.java:81) at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:2432) at ognl.ASTProperty.setValueBody(ASTProperty.java:127) at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220) at ognl.SimpleNode.setValue(SimpleNode.java:301) at ognl.Ognl.setValue(Ognl.java:737) at com.opensymphony.xwork2.ognl.OgnlUtil$1.execute(OgnlUtil.java:293) at com.opensymphony.xwork2.ognl.OgnlUtil$1.execute(OgnlUtil.java:288) at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecute(OgnlUtil.java:346) at com.opensymphony.xwork2.ognl.OgnlUtil.setValue(OgnlUtil.java:288) at com.opensymphony.xwork2.ognl.OgnlValueStack.trySetValue(OgnlValueStack.java:183) at com.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:170) at com.opensymphony.xwork2.ognl.OgnlValueStack.setParameter(OgnlValueStack.java:152) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.setParameters(ParametersInterceptor.java:303) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:221) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:140) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54) at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:567) at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81) at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99) 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:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2517) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2506) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:744) 没有经过我 Person [age=5214, birth=null]
刚开始我一致想不明白，为什么会报这个错误，哪里报的这个错误，更不要说怎么解决了，今天早上起来后，我就分析，报了这个错误，就是说 ，这个错误被代码catch了，没有被抛出来，如果我现在让它被抛出来，在前台以“您输入的时间格式错误。”的形式显示给用户，不就可以了吗？
在接着分析，那么是哪里报的这个错误呢？既然是类型转换时出的错误，那么就应该是自定义的类型转换器中报的错，再次查看代码 ，在代码
/**
* 字符串转 为Date类型
*/
@Override
public Object convertFromString(Map context, String[] values, Class toClass) {
System.out.println("convertFromString....");
if(toClass == Date.class){
if(values != null && values.length > 0){
String value = values[0];
try {
return getDateFormat().parseObject(value);
} catch (ParseException e) {
e.printStackTrace();
}
}
}
//若没有转换成功，则返回values
return values;
}中有一个catch 上面的错误有可能就是被它抓到的，然后在其前后的添加如下的打印代码
catch (ParseException e) {
System.out.println(" 经过我");
e.printStackTrace();
System.out.println(" 没有经过我");
}
java.text.ParseException: Format.parseObject(String) failed convertFromString.... 经过我 at java.text.Format.parseObject(Format.java:245) at com.baidu.action.conversion.DateConverter.convertFromString(DateConverter.java:45) at org.apache.struts2.util.StrutsTypeConverter.convertValue(StrutsTypeConverter.java:52) at com.opensymphony.xwork2.conversion.impl.DefaultTypeConverter.convertValue(DefaultTypeConverter.java:92) at com.opensymphony.xwork2.conversion.impl.XWorkConverter.convertValue(XWorkConverter.java:314) at com.opensymphony.xwork2.ognl.OgnlTypeConverterWrapper.convertValue(OgnlTypeConverterWrapper.java:39) at ognl.OgnlRuntime.getConvertedType(OgnlRuntime.java:1081) at ognl.OgnlRuntime.getConvertedTypes(OgnlRuntime.java:1098) at ognl.OgnlRuntime.getConvertedMethodAndArgs(OgnlRuntime.java:1124) at ognl.OgnlRuntime.getAppropriateMethod(OgnlRuntime.java:1210) at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1224) at ognl.OgnlRuntime.setMethodValue(OgnlRuntime.java:1503) at ognl.ObjectPropertyAccessor.setPossibleProperty(ObjectPropertyAccessor.java:85) at ognl.ObjectPropertyAccessor.setProperty(ObjectPropertyAccessor.java:162) at com.opensymphony.xwork2.ognl.accessor.ObjectAccessor.setProperty(ObjectAccessor.java:27) at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:2432) at com.opensymphony.xwork2.ognl.accessor.CompoundRootAccessor.setProperty(CompoundRootAccessor.java:81) at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:2432) at ognl.ASTProperty.setValueBody(ASTProperty.java:127) at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220) at ognl.SimpleNode.setValue(SimpleNode.java:301) at ognl.Ognl.setValue(Ognl.java:737) at com.opensymphony.xwork2.ognl.OgnlUtil$1.execute(OgnlUtil.java:293) at com.opensymphony.xwork2.ognl.OgnlUtil$1.execute(OgnlUtil.java:288) at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecute(OgnlUtil.java:346) at com.opensymphony.xwork2.ognl.OgnlUtil.setValue(OgnlUtil.java:288) at com.opensymphony.xwork2.ognl.OgnlValueStack.trySetValue(OgnlValueStack.java:183) at com.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:170) at com.opensymphony.xwork2.ognl.OgnlValueStack.setParameter(OgnlValueStack.java:152) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.setParameters(ParametersInterceptor.java:303) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:221) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:140) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245) at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54) at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:567) at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81) at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99) 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:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2517) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2506) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:744) 没有经过我 Person [age=5214, birth=null]既然知道是它报的错，下面的就，so easy。让它把问题报出来就好了！
修改后的代码如下
/**
* 字符串转 为Date类型
* 问题的解决：仅仅是把catch 中的 e.printStackTrace();
* 换成了 throw new TypeConversionException();
* 问题就解决了！
*/
@Override
public Object convertFromString(Map context, String[] values, Class toClass) {
System.out.println("convertFromString....");
if(toClass == Date.class){
if(values != null && values.length > 0){
String value = values[0];
try {
return getDateFormat().parseObject(value);
}catch (ParseException e) {
throw new TypeConversionException();
}
}
}
//若没有转换成功，则返回values
return values;
}
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原文地址：http://blog.csdn.net/chuck_kui/article/details/51371575
