ssm 映射文件出错

前言：今天做项目的时候发现了一个错误，也花费了不少时间去解决，为避免以后在犯该错,或者能快速定位与解决问题，特记之。

错误的日记如下：

严重: Servlet.service() for servlet [springmvc] in context with path [/myTicketManager] threw exception [Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.sxt.dao.CustomersDaoMapper.findPageCustomers] with root causeorg.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.sxt.dao.CustomersDaoMapper.findPageCustomersat org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:189)at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:43)at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:58)at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:51)at com.sun.proxy.$Proxy13.findPageCustomers(Unknown Source)at com.sxt.service.impl.CustomerServiceImpl.findPageCustomers(CustomerServiceImpl.java:20)at com.sxt.controller.CustomerController.findCustomersWithPage(CustomerController.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:497)at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)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:745)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:953)at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:855)at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:829)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.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.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:745)

其中关键信息是：

[Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.sxt.dao.CustomersDaoMapper.findPageCustomers] with root causeorg.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.sxt.dao.CustomersDaoMapper.findPageCustomers

意思是非法绑定错误，无法找到配置文件！！！！！

我反复检查了我的目录结构，配置文件明明存在，且名字也没写错，最后才发现错误出处！

总结：发生该错误有以下两种情况

一.映射文件名要与dao层名一样，如（UserDaoMapper.java  与 UserDaoMapper.xml）

二.映射文件里的方法id名需和Dao层里的方法名一致，一 一对应

最后：与其花编码的两倍时间去查改错误，不如在编码之初就细心将其规避！！！