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第一次遇到该异常，在网上搜了很长时间也没找到解决答案，特此记录
1.异常展示：
com.fasterxml.jackson.databind.JsonMappingException: No content to map due to end-of-input
at [Source: java.io.StringReader@11a92b24; line: 1, column: 1] at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:164) at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:2931) at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2873) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2034) at com.allcam.system.utils.JSonUtils.readValue(JSonUtils.java:30) at com.allcam.system.manager.statistics.impl.UserResourceDayStatisticsServiceImpl.getResourceDayStatistics(UserResourceDayStatisticsServiceImpl.java:45) at com.allcam.system.manager.statistics.impl.UserResourceDayStatisticsServiceImpl$$FastClassByCGLIB$$6b11b7f.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:710) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:643) at com.allcam.system.manager.statistics.impl.UserResourceDayStatisticsServiceImpl$$EnhancerByCGLIB$$65dd2f5a.getResourceDayStatistics(<generated>) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207) at com.sun.proxy.$Proxy56.getResourceDayStatistics(Unknown Source) at com.allcam.system.manager.statistics.controller.UserResourceDayStatisticsController.getUserResourceDayStatistics(UserResourceDayStatisticsController.java:41) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)[2017-08-16 17:06:54,911][DEBUG][org.apache.http.impl.conn.Wire.wire(Wire.java:72)][http-nio-8080-exec-3] - << "HTTP/1.1 200 OK[\r][\n]" - [2017-08-16 17:06:54,912][DEBUG][org.apache.http.impl.conn.Wire.wire(Wire.java:72)][http-nio-8080-exec-3] - << "Server: Apache-Coyote/1.1[\r][\n]" -2.异常解析，本异常报错的原因为调用webservice服务，从webservice返回的对象没有将其转为json对象，而是直接将对象返回了，所以从webservice返回的时候
就报了此错误，
3.解决方案：将webservice返回的对象转化为json格式，，特此将原代码贴出：
@ResponseBody @RequestMapping(value="resDayStatistics") public String getUserResourceDayStatistics(HttpServletRequest request,HttpServletResponse response){ UserResourceDayStatistics dayStatistics2 = new UserResourceDayStatistics(); try { UserResourceDayStatistics dayStatistics = new UserResourceDayStatistics(); InputStream inputStream= request.getInputStream(); String reqJson=IOUtils.toString(inputStream,ServiceContants.UTF8_CODE); if(reqJson != null && reqJson != ""){ //json转成UserResourceDayStatistics对象 dayStatistics=JSonUtils.readValue(reqJson, UserResourceDayStatistics.class); } dayStatistics2=dayService.getResourceDayStatistics(dayStatistics); } catch (Exception e) { e.printStackTrace(); } // return "/main/webapp/dayStatistics.jsp"; return JSonUtils.toJSon(dayStatistics2); //返回json格式对象 }} 由于要返回的是一个json对象，所以在方法头上加一个@ResponseBody注解，该注解的作用是将返回结果的格式写入到返回结果中，否则就会解析为一个页面。。。。。。