我创建了一个简单的DAO接口和DAOImpl类来实现DAO。从jsp获取数据并将其存储到数据库中。成功完成后，我正在渲染到xml的tile。我返回异常时返回tile的视图。在这篇文章中提到的定义瓷砖有什么问题吗？数据存储在数据库中，但在前端我得到了以下异常，也在控制台上。
Aug 11, 2015 4:01:03 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [User] in context with path [/SpringUser] threw exception [Request processing failed; nested exception is org.apache.tiles.impl.InvalidTemplateException: Cannot render a null template] with root cause
org.apache.tiles.impl.InvalidTemplateException: Cannot render a null template
at org.apache.tiles.renderer.impl.TemplateAttributeRenderer.write(TemplateAttributeRenderer.java:51)
at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106)
at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:670)
at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:690)
at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:644)
at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:627)
at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:321)
at org.springframework.web.servlet.view.tiles2.TilesView.renderMergedOutputModel(TilesView.java:124)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1180)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
相同的tile文件如下
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE tiles-definitions PUBLIC
"-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"
"http://tiles.apache.org/dtds/tiles-config_2_0.dtd">
<tiles-definitions>
<definition name="user.reg" template="/jsp/template.jsp">
<put-attribute name="title" value="Sample App"/>
<put-attribute name="header" value=""/>
<put-attribute name="body" value=""/>
<put-attribute name="footer" value=""/>
</definition>
<definition name="user.registration" extends="user.reg">
<put-attribute name="body" value="/jsp/success.jsp" />
</definition>
<definition name="user.registrationUserSuccess" >
<put-attribute name="body" value="/jsp/login.jsp" />
</definition>
<definition name="user.home" >
<put-attribute name="body" value="/jsp/login.jsp" />
</definition>
<definition name="user.profile">
<put-attribute name="body" value="/jsp/profile.jsp" />
</definition>
<definition name="user.error">
<put-attribute name="body" value="/jsp/error.jsp" />
</definition>
</tiles-definitions>
相同的控制器类如下 -
package com.controller;
import javax.servlet.http.HttpServletRequest;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.dao.UserDAO;
import com.entity.UserDetails;
@Controller
public class UserController {
private static Logger logger = Logger.getLogger(UserController.class);
String errForward = "user.error", forward = null;
@Autowired
UserDAO userDAO;
UserDetails ud = new UserDetails();
@RequestMapping("/registerUser")
public String registerUser(HttpServletRequest request) {
logger.info("### Inside registeration controller ####");
System.out.println("registerUser");
int isSave=0;
Date creation_time=null,lastModTime=null;
SimpleDateFormat ft = new SimpleDateFormat ("dd/MM/yyyy 'at' hh:mm:ss a zzz");
Date date=new Date();
String input = ft.format(date);
try {
creation_time = ft.parse(input);
lastModTime = ft.parse(input);
} catch (ParseException e) {
logger.error("/* Unable to parse date ****["+ ft+"]*****/");
}
String fName=request.getParameter("fName");
fName=(fName.equals(""))?"":fName.trim();
String lName=request.getParameter("lName");
lName=(lName.equals(""))?"":lName.trim();
int age=Integer.parseInt(request.getParameter("age"));
age=(age==0)?0:age;
String email=request.getParameter("email");
email=(email.equals(""))?"":email.trim();
String pswd=request.getParameter("pswd");
pswd=(pswd.equals(""))?"":pswd.trim();
ud.setFirstName(fName);
ud.setLastName(lName);
ud.setAge(age);
ud.setPassword(pswd);
ud.setEmail(email);
ud.setCreationTime(creation_time);
ud.setLastModTime(lastModTime);
try{
isSave=userDAO.saveUserDetails(ud);
if (isSave==0){
forward="user.registrationUserSuccess";
logger.info("/******** Successfully saved the data :::["+isSave+"]::: *****/");
}
}catch(Exception e){
logger.error("##### Error while saving use details #####"+e);
return (forward);
}
return (forward);
}
}
servlet文件的内容为 -
?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">
<!-- <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
</bean> -->
<mvc:annotation-driven/>
<context:annotation-config/>
<context:component-scan base-package="com.controller"></context:component-scan>
<context:component-scan base-package="com.dao"></context:component-scan>
<context:component-scan base-package="com.entity"></context:component-scan>
<!-- title defining -->
<bean id="viewResolver"
class="org.springframework.web.servlet.view.UrlBasedViewResolver">
<property name="viewClass">
<value>
org.springframework.web.servlet.view.tiles2.TilesView
</value>
</property>
</bean>
<!-- defining title file location -->
<bean id="tilesConfigurer" class="org.springframework.web.servlet.view.tiles2.TilesConfigurer">
<property name="definitions">
<list>
<value>/WEB-INF/tiles.xml</value>
</list>
</property>
</bean>
<import resource="db-config.xml" />
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
答案 0 :(得分：1)
我从上到下检查了项目。在我更改目录结构之前，我没有找到任何内容。 jsp页面路径在WEB-INF文件夹中，而不应该在WEB_INF之外和WEB CONTENT文件夹中。在纠正结构后，我得到了所需的结果。