我的主页有两个超链接
<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>
而处理此页面的控制器是...
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");
}
}
然后，当我单击超链接登录主页时，它会引发异常
我的LoginPage.jsp文件
<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>
我的控制器代码
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");
}
}
我有一个名为LoginPojo的Pojo类
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;
}
}
移至LoginPage.jsp时，出现BindingResult错误。
帮帮我....
错误：
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)
最佳答案
将LoginPojo的实例添加到带有attributeName POJO的模型中。这将允许Spring标签建立数据绑定。即使显示空白表格以插入记录，模型仍需要包含一个可用于数据绑定的对象。
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());
}
//...
}