net.sf.json.JSONException: JSON does not allow non-finite numbers

报错内容：

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is net.sf.json.JSONException: JSON does not allow non-finite numbers
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:894)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:643)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)
	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:49)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
	at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
	at org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter.doFilter(DefaultLoginPageGeneratingFilter.java:91)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:183)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:183)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
	at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Thread.java:619)
Caused by: net.sf.json.JSONException: JSON does not allow non-finite numbers
	at net.sf.json.util.JSONUtils.testValidity(JSONUtils.java:597)
	at net.sf.json.AbstractJSON._processValue(AbstractJSON.java:269)
	at net.sf.json.JSONObject._processValue(JSONObject.java:2655)
	at net.sf.json.JSONObject.processValue(JSONObject.java:2721)
	at net.sf.json.JSONObject.setInternal(JSONObject.java:2736)
	at net.sf.json.JSONObject.setValue(JSONObject.java:1424)
	at net.sf.json.JSONObject.defaultBeanProcessing(JSONObject.java:765)
	at net.sf.json.JSONObject._fromBean(JSONObject.java:699)
	at net.sf.json.JSONObject.fromObject(JSONObject.java:172)
	at net.sf.json.AbstractJSON._processValue(AbstractJSON.java:274)
	at net.sf.json.JSONArray._processValue(JSONArray.java:2513)
	at net.sf.json.JSONArray.processValue(JSONArray.java:2538)
	at net.sf.json.JSONArray.addValue(JSONArray.java:2525)
	at net.sf.json.JSONArray._fromCollection(JSONArray.java:1056)
	at net.sf.json.JSONArray.fromObject(JSONArray.java:123)
	at net.sf.json.AbstractJSON._processValue(AbstractJSON.java:240)
	at net.sf.json.JSONObject._processValue(JSONObject.java:2655)
	at net.sf.json.JSONObject.processValue(JSONObject.java:2721)
	at net.sf.json.JSONObject.setInternal(JSONObject.java:2736)
	at net.sf.json.JSONObject.setValue(JSONObject.java:1424)
	at net.sf.json.JSONObject.defaultBeanProcessing(JSONObject.java:765)
	at net.sf.json.JSONObject._fromBean(JSONObject.java:699)
	at net.sf.json.JSONObject.fromObject(JSONObject.java:172)
	at net.sf.json.AbstractJSON._processValue(AbstractJSON.java:274)
	at net.sf.json.JSONArray._processValue(JSONArray.java:2513)
	at net.sf.json.JSONArray.processValue(JSONArray.java:2538)
	at net.sf.json.JSONArray.addValue(JSONArray.java:2525)
	at net.sf.json.JSONArray._fromCollection(JSONArray.java:1056)
	at net.sf.json.JSONArray.fromObject(JSONArray.java:123)
	at net.sf.json.AbstractJSON._processValue(AbstractJSON.java:240)
	at net.sf.json.JSONObject._processValue(JSONObject.java:2655)
	at net.sf.json.JSONObject.processValue(JSONObject.java:2721)
	at net.sf.json.JSONObject.element(JSONObject.java:1786)
	at net.sf.json.JSONObject.element(JSONObject.java:1764)
	at net.sf.json.JSONObject.put(JSONObject.java:2380)
	at com.ways.gtmc.app.webapp.controller.CitySaleAnalyController.getSales(CitySaleAnalyController.java:179)
	at sun.reflect.GeneratedMethodAccessor171.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:100)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:604)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:565)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
	... 55 more

原因：JSON不允许里面的值有无穷值，例如

Integer a = 1;
		Integer b = 0;
		Double d =(double)a/(double)b;
		System.out.println(d.isInfinite());//输出true

如果d.isInfinite()为true,再把d的值放到JSON中，则会报如上异常，
解决办法：
判断一下传入JSON中的值，如果isInfinite()==true则返回null，加入判断：

if(d.isInfinite()){
  return null;
}