转载请注明来源-作者@loongshawn：http://blog.csdn.net/loongshawn/article/details/61191925，建议读者阅读原文，确保获得完整的信息

1.异常片段

Java代码中，在进行URL url = new URL(urllink)操作时，提示以下异常信息，该类异常主要问题出在参数urllink上面。

异常片段1

 java.net.MalformedURLExceptionat java.net.URL.<init>(URL.java:619)at java.net.URL.<init>(URL.java:482)at java.net.URL.<init>(URL.java:431)

解决方案：
上述异常原因是urllink为空。将该参数调整为有效url即可。

异常片段2

java.net.MalformedURLException: no protocol:at java.net.URL.<init>(URL.java:585)at java.net.URL.<init>(URL.java:482)at java.net.URL.<init>(URL.java:431)

解决方案：
上述异常原因是urllink前缀http://没有带上，确保url形如http://blog.csdn.net/loongshawn/article/details/61191925。将该参数调整为有效url即可。

2.异常全貌

 java.net.MalformedURLExceptionat java.net.URL.<init>(URL.java:619)at java.net.URL.<init>(URL.java:482)at java.net.URL.<init>(URL.java:431)at com.autonavi.utils.kelude.Bash64Util.getBash64FromUrl(Bash64Util.java:29)at com.autonavi.method.kelude.AoneKeludeAttachmentCreate.action(AoneKeludeAttachmentCreate.java:70)at com.autonavi.dispatcher.Dispatcher.gaokuaiAoneAttachmentCreate(Dispatcher.java:329)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:606)at com.autonavi.dispatcher.Dispatcher.dispatcherCenter(Dispatcher.java:65)at com.autonavi.controller.HomeController.view(HomeController.java:92)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:606)at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:832)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:743)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:961)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869)at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:87)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:670)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerExceptionat java.net.URL.<init>(URL.java:524)... 64 more
2017-03-10-09-53 [http-nio-7001-exec-1] [com.autonavi.utils.kelude.Bash64Util] [ERROR] - Bash64Utils.getBash64FromUrl MalformedURLException error: java.net.MalformedURLException

异常分析，注意上述异常末尾提示信息：Caused by: java.lang.NullPointerException，可以推断出，是由于NullPointerException导致的MalformedURLException ，因此问题就出在urllink为空上。

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java.net.MalformedURLException异常说明

1.异常片段

2.异常全貌

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