我在网上查看了几乎所有与此问题相关的答案,但无法在我的代码中找出问题所在.
这是我的JSP页面.
<form:form method="POST" commandName="category" modelAttribute="category" action="search_category">
<form:input path="category_name" />
<input type="submit" value="Submit">
</form:form>
当我删除
<form:input path="category_name" />
它工作正常.我可以与我的控制器通信.所以问题与这条线有关.
@Controller
public class SearchCategory {
@Autowired
private CategoryService categoryService;
@RequestMapping(value = "/search_category",method = RequestMethod.POST)
public @ResponseBody String searchCategoryFromDatabase(@modelattribute("category") Category category,BindingResult result){
return "something";
}
}
这是我的web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<!-- Processes application requests -->
<servlet>
<servlet-name>appServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/servlet-context.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>appServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<filter>
<filter-name>hibernateFilter</filter-name>
<filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>hibernateFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>
这是我的servlet-context.xml
<!-- Set the default page as index.jsp --> <mvc:view-controller path="/" view-name="index"/> <!-- Map resources --> <mvc:resources mapping="/resources/**" location="/,classpath:/Meta-INF/web-resources/" /> <!-- Map simple view name such as "test" into /WEB-INF/views/test.jsp --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/" /> <property name="suffix" value=".jsp" /> </bean>
还有我的applicationContext.xml
<!-- Enable @Controller annotation support -->
<mvc:annotation-driven />
<context:annotation-config/>
<!-- Set the default page as index.jsp -->
<mvc:view-controller path="/" view-name="index"/>
<!-- Map resources -->
<mvc:resources mapping="/resources/**" location="/,classpath:/Meta-INF/web-resources/" />
<!-- Map simple view name such as "test" into /WEB-INF/views/test.jsp -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- Scan classpath for annotations (eg: @Service,@Repository etc) -->
<context:component-scan base-package="com.XXXX"/>
<!-- JDBC Data Source. It is assumed you have MysqL running on localhost port 3306 with
username root and blank password. Change below if it's not the case -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.MysqL.jdbc.Driver"/>
<property name="url" value="jdbc:MysqL://localhost:3306/XXXX"/>
<property name="username" value="XXXX"/>
<property name="password" value="XXXX"/>
<property name="validationQuery" value="SELECT 1"/>
</bean>
<!-- Hibernate Session Factory -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionfactorybean">
<property name="dataSource" ref="dataSource"/>
<property name="configLocation">
<value>classpath:hibernate.cfg.xml</value>
</property>
<property name="packagesToScan">
<array>
<value>com.XXXX</value>
</array>
</property>
<property name="hibernateProperties">
<value>
hibernate.dialect=org.hibernate.dialect.MysqLDialect
</value>
</property>
</bean>
<!-- Hibernate Transaction Manager -->
<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<!-- Activates annotation based transaction management -->
<tx:annotation-driven transaction-manager="transactionManager"/>
我可能在我的XML文件中做错了.我是这个春天的新手 – Hibernate员工等待你的帮助.谢谢..
这是被抛出的异常
Stacktrace:] with root cause
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'category' available as request attribute
at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:141)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:168)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:188)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:154)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId(AbstractDataBoundFormElementTag.java:141)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId(AbstractDataBoundFormElementTag.java:132)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:116)
at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:422)
at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:142)
at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:84)
at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:80)
at org.apache.jsp.index_jsp._jspx_meth_form_005finput_005f0(index_jsp.java:208)
at org.apache.jsp.index_jsp._jspx_meth_form_005fform_005f0(index_jsp.java:168)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:100)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
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.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:149)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
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:99)
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:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
解决方法
如果您通过http：// localhost：8080 / yourapp之类的东西进入index.jsp,我会假设你有一个< welcome-file>为了它.
这意味着index.jsp生成HTML而不需要Spring进行任何预处理.你试图渲染这个
<form:form method="POST" commandName="category" modelAttribute="category" action="search_category">
<form:input path="category_name" />
<input type="submit" value="Submit">
</form:form>
其中< form：form>来自Spring的标签库.首先,请注意您同时使用commandName和modelAttribute.这是多余的.使用其中一个,而不是两个.其次,当您指定其中任何一个时,标记实现将查找具有指定名称的HttpServletRequest属性.在您的情况下,HttpServletRequest属性中没有添加此类属性.这是因为Servlet容器直接转发到index.jsp.
而不是这样做,创建一个新的@Controller处理程序方法,该方法将向模型添加属性并转发到index.jsp视图.
@RequestMapping(value = "/",method = RequestMethod.GET)
public String welcomePage(Model model) {
model.addAttribute("category",new Category()); // the Category object is used as a template to generate the form
return "index";
}
你可以摆脱这个
<!-- Set the default page as index.jsp --> <mvc:view-controller path="/" view-name="index"/>
此外,将任何mvc配置从applicationContext.xml文件移动到servlet-context.xml文件.这就是它所属的地方. Here’s why.
