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2 つのハイパーリンクがあるマイ ホームページ

<body>
<pre>

    <font face="Times New Roman" size="20"><a href="logincontrol.htm">Login</a></font>

    <font face="Times New Roman" size="20"><a href="registercontrol.htm">Register</a></font>

</pre>

このページを処理するコントローラーは...

package core;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

public class MainController extends MultiActionController {

    public ModelAndView logincontrol(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        System.out.println("Add method called");
        return new ModelAndView("LoginPage");
    }

    public ModelAndView registercontrol(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        System.out.println("Register method called");
        return new ModelAndView("RegisterPage");
    }
}

次に、ホームページのハイパーリンクログインをクリックすると、例外がスローされます

私の LoginPage.jsp ファイル

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>

<%@ taglib prefix="f" uri="http://www.springframework.org/tags/form"%>
<body>

<f:form method="post" commandName="POJO">
    <pre>
        User Name : <f:input path="username" />
        Password : <f:input path="password" />
    </pre>
</f:form>

<%-- <div>The request scope is: ${requestScope}</div>
<div>The command is: ${requestScope.POJO}</div> --%>
</body>
</html>

私のコントローラーコード

package core;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;

public class LoginController extends SimpleFormController{


    public LoginController() {
//      // TODO Auto-generated constructor stub
        setCommandClass(LoginPojo.class);
        setCommandName("POJO");
    }

@Override
protected ModelAndView onSubmit(Object command) throws Exception {

    System.out.println("Inside mainController "+command.toString());    
    return new ModelAndView("LoginPage");

}   

}

そして、LoginPojo という名前の Pojo クラスがあります。

package core;

public class LoginPojo {

    String username;
    String password;

    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }


}

LoginPage.jsp に移動しているときに、BindingResult エラーが発生します。ヘルプ....

エラー：

Jan 27, 2013 12:02:00 AM org.springframework.web.servlet.tags.RequestContextAwareTag doStartTag
SEVERE: Neither BindingResult nor plain target object for bean name 'POJO' available as request attribute
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'POJO' 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:178)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:198)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:164)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId(AbstractDataBoundFormElementTag.java:151)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId(AbstractDataBoundFormElementTag.java:142)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:126)
    at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:421)
    at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:142)
    at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:102)
    at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:79)
    at org.apache.jsp.view.LoginPage_jsp._jspx_meth_f_005finput_005f0(LoginPage_jsp.java:157)
    at org.apache.jsp.view.LoginPage_jsp._jspx_meth_f_005fform_005f0(LoginPage_jsp.java:118)
    at org.apache.jsp.view.LoginPage_jsp._jspService(LoginPage_jsp.java:79)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
    at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
    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.doGet(FrameworkServlet.java:778)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:304)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)
4

1 に答える 1

2

LoginPojoattributeName を使用してモデルにのインスタンスを追加しますPOJO。これにより、Spring タグがデータバインディングを確立できるようになります。レコードを挿入するために空白のフォームを表示しても、データバインディングに使用できるオブジェクトをモデルに含める必要があります。

public class MainController extends MultiActionController {
    public ModelAndView logincontrol(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        System.out.println("Add method called");
        return new ModelAndView("LoginPage", "POJO", new LoginPojo());
    }
    //...
}
于 2013-01-26T18:19:56.497 に答える