Causedby:java.net.URISyntaxException:Illegalcharacter异常解决方法

1、异常如下：

Caused by: java.lang.IllegalArgumentException: Illegal character in query at index 59: http://so.csdn.net/so/search/s.do?p=1&ref=toolbar&q=xxx xxx&ref=toolbar
at java.net.URI.create(Unknown Source) ~[na:1.8.0_40]
at org.apache.http.client.methods.HttpGet.(HttpGet.java:69) ~[httpclient-4.5.2.jar!/:4.5.2]
at com.xxx.srd.tcldp.service.CsdnProcessorService.getResponse(CsdnProcessorService.java:213) ~[classes!/:0.0.1-SNAPSHOT]
at com.xxx.srd.tcldp.service.CsdnProcessorService.save(CsdnProcessorService.java:75) ~[classes!/:0.0.1-SNAPSHOT]
at com.xxx.srd.tcldp.schedule.ScheduleSpiderGithub.githubScheduleTask(ScheduleSpiderGithub.java:88) ~[classes!/:0.0.1-SNAPSHOT]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_40]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_40]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_40]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_40]
at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:269) ~[spring-core-4.3.6.RELEASE.jar!/:4.3.6.RELEASE]
at org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean$MethodInvokingJob.executeInternal(MethodInvokingJobDetailFactoryBean.java:257) ~[spring-context-support-4.3.6.RELEASE.jar!/:4.3.6.RELEASE]
... 3 common frames omitted
Caused by: java.net.URISyntaxException: Illegal character in query at index 59: http://so.csdn.net/so/search/s.do?p=1&ref=toolbar&q=xxx xxx&ref=toolbar
at java.net.URI$Parser.fail(Unknown Source) ~[na:1.8.0_40]
at java.net.URI$Parser.checkChars(Unknown Source) ~[na:1.8.0_40]
at java.net.URI$Parser.parseHierarchical(Unknown Source) ~[na:1.8.0_40]
at java.net.URI$Parser.parse(Unknown Source) ~[na:1.8.0_40]
at java.net.URI.(Unknown Source) ~[na:1.8.0_40]
... 14 common frames omitted

如果直接在浏览器中输入带特殊字符的url是没有问题的，但是，如果通过httpclient这个客户端来请求带特殊字符的url时，例如空格等，这个时候，就会出现上面的异常，需要对这些特殊字符进行转义。

3、解决方案

URL中的特殊字符 
有些符号在URL中是不能直接传递的，如果要在URL中传递这些特殊符号，那么就要使用他们的编码了。编码的格式为：%加字符的ASCII码，即一个百分号%，后面跟对应字符的ASCII（16进制）码值。例如 空格的编码值是"%20"。 

下表中列出了一些URL特殊符号及编码