Java bean名称用户的绑定结果和普通目标都不能作为请求属性使用_Java_Spring_Hibernate_Jsp_Spring Mvc

Java bean名称用户的绑定结果和普通目标都不能作为请求属性使用

java spring hibernate jsp spring-mvc

Java bean名称用户的绑定结果和普通目标都不能作为请求属性使用,java,spring,hibernate,jsp,spring-mvc,Java,Spring,Hibernate,Jsp,Spring Mvc,我不熟悉春天和冬眠。当我尝试打开JSP页面时，出现以下错误： SEVERE: Neither BindingResult nor plain target object for bean name 'user' available as request attribute java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'user' available as

我不熟悉春天和冬眠。当我尝试打开JSP页面时，出现以下错误：

SEVERE: Neither BindingResult nor plain target object for bean name 'user' available as request attribute
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'user' available as request attribute
    at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:144)
    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.views.RegisterUser_jsp._jspx_meth_form_005finput_005f0(RegisterUser_jsp.java:177)
    at org.apache.jsp.views.RegisterUser_jsp._jspService(RegisterUser_jsp.java:97)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)
25 Jun, 2015 5:54:22 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [jsp] in context with path [/Banking] threw exception [java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'user' available as request attribute] with root cause
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'user' available as request attribute
    at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:144)
    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.views.RegisterUser_jsp._jspx_meth_form_005finput_005f0(RegisterUser_jsp.java:177)
    at org.apache.jsp.views.RegisterUser_jsp._jspService(RegisterUser_jsp.java:97)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)

UserServiceImpl.java

package com.krishnaja.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.krishnaja.dao.UserDao;
import com.krishnaja.entity.User;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    @Transactional
    public void saveUser(User user)
    {
        userDao.saveUser(user);
    }

    @Transactional
    public List<User> retrieveAllUsers()
    {
        return userDao.retrieveAllUsers();
    }
}

package com.krishnaja.service；
导入java.util.List；
导入org.springframework.beans.factory.annotation.Autowired；
导入org.springframework.stereotype.Service；
导入org.springframework.transaction.annotation.Transactional；
导入com.krishnaja.dao.UserDao；
导入com.krishnaja.entity.User；
@服务
公共类UserServiceImpl实现UserService{
@自动连线
私有UserDao UserDao；
@交易的
公共void saveUser（用户）
{
userDao.saveUser（用户）；
}
@交易的
公共列表检索所有用户（）
{
返回userDao.retrieveAllUsers（）；
}
}

spring-servlet.xml

<?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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:flex="http://www.springframework.org/schema/flex" xmlns:amq="http://activemq.apache.org/schema/core"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd 
        http://www.springframework.org/schema/security
        http://www.springframework.org/schema/security/spring-security-3.1.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop.xsd 
        http://www.springframework.org/schema/tx    
        http://www.springframework.org/schema/tx/spring-tx.xsd 
        http://activemq.apache.org/schema/core 
        http://activemq.apache.org/schema/core/activemq-core-5.5.0.xsd
        http://www.springframework.org/schema/flex      
        http://www.springframework.org/schema/flex/spring-flex-1.0.xsd"
    >


    <context:annotation-config />
    <context:component-scan base-package="com.krishnaja.controller"/> 
    <context:component-scan base-package="com.krishnaja.dao"/> 
    <context:component-scan base-package="com.krishnaja.service"/> 
    <context:component-scan base-package="com.krishnaja.entity"/> 
    <bean id="user" class="com.krishnaja.controller.UserController"></bean>

    <bean id="jspViewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/views/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <bean id="messageSource"
        class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
        <property name="basename" value="resources/user.properties" />
        <property name="defaultEncoding" value="UTF-8" />
    </bean>
    <bean id="propertyConfigurer"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
        p:location="/WEB-INF/jdbc.properties" />

    <bean id="dataSource"
        class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"
        p:driverClassName="${jdbc.driverClassName}"
        p:url="${jdbc.databaseurl}" p:username="${jdbc.username}"
        p:password="${jdbc.password}" />


    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="configLocation">
            <value>/WEB-INF/hibernate.cfg.xml</value>
        </property>

        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">${jdbc.dialect}</prop>
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>
    </bean>

    <tx:annotation-driven />

    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>
</beans>


/WEB-INF/hibernate.cfg.xml
${jdbc.dial}
真的

将控制器方法更改为：

  @RequestMapping(value = "/", method = RequestMethod.POST)
    public String saveUSer(@ModelAttribute("user")User user, Model model)
    {
        model.addAttribute("user", new User());
        if(user.getUsername().isEmpty()){
            return "redirect:/";
        } else{
        userService.saveUser(user);
         }
        return "redirect:/index.jsp";
    }

如果不行，请告诉我，我还有其他建议

更新

将JSP正文更改为：

<body>
<c:url var="addAction" value="/" ></c:url>
    <form:form action="${addAction}"  commandName="user">
    <table>

 <c:if test="${!empty user.Username}">
            <tr>
                <td>
                    <form:label path="userid">
                        <spring:message text="userid"/>
                    </form:label>
                </td>
                <td>
                    <form:input path="userid" readonly="true" size="8"  disabled="true" />
                    <form:hidden path="userid" />
                </td>
            </tr>
        </c:if>
        <tr>
            <td>User Name</td>
            <td><form:input path="userName"/></td>
        </tr>

        <tr>
            <td>Password</td>
            <td><form:input path="password"/></td>
        </tr>

        <tr>
            <td></td>
            <td>  <c:if test="${empty user.Username}">
                    <input type="submit"
                           value="<spring:message text="Add User"/>" />
                </c:if>
        </tr>
    </table>
    </form:form>
</body>


用户名
密码

JSP中的用户ID是您计划保存的唯一密钥。如果你的模型是正确的，这将工作。我不会把登录页面上的注册方式称为如此可怕，但这是你的选择

由于您没有添加模型对象，所以出现异常，这就是引发此异常的原因

尝试加载项控制器

model.addObject("user", user);

在jsp页面中

<form:form   commandName="user" modelAttribute="user">

我希望这将帮助您

感谢您的回复…我添加了model.addAttribute，比如ModelMap model=new ModelMap（）；model.addAttribute（“user”，new user（））；这是正确的吗？如果是这样，它仍然不工作不，我不是指模型映射，我只是指模型，请检查更新的控制器方法。请注意，这里有一个输入参数模型，不用担心，您不需要在JSP中为该参数更改任何内容。即使这样做行得通，我建议您阅读更多关于Spring、JSP的内容。

model.addObject("user", user);

<form:form   commandName="user" modelAttribute="user">