Просто я рассказываю о пользовательском интерфейсе Spring mvc и серверной обработке, но не могу передать параметр в бэкэнд-процесс.
здесь код jsp формы.
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
<link href="src/main/webapp/recources/css/login.css" rel="stylesheet">
<link href="src/main/webapp/recources/css/boostrap.min.css"
rel="stylesheet">
<script
src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script src="src/main/webapp/recources/js/boostrap.min.js"></script>
</head>
<body>
<spring:url value="register" var="registerUrl" />
<div class="login-page">
<div class="form">
<form:form class="register-form" action="${registerUrl}"
method="post" modelAttribute="user">
<spring:bind path="username">
<div class="form-group ${status.error ? 'has-error': ''}">
<form:input type="text" path="username" placeholder="name" />
<form:errors path="username" />
</div>
</spring:bind>
<spring:bind path="password">
<div class="form-group ${status.error ? 'has-error':''}">
<form:input type="password" path="password" placeholder="password" />
<form:errors path="password"></form:errors>
</div>
</spring:bind>
<button>create</button>
<p class="message">
Already registered? <a href="#">Sign In</a>
</p>
</form:form>
здесь класс контроллера Java.
package com.myApps.controller.userservice;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import com.myApps.vo.Register;
@Controller
@RequestMapping("/")
public class LoginController {
@RequestMapping("/")
public String loginPage()
{
return "login";
}
@RequestMapping(value="login", method=RequestMethod.POST)
public String login()
{
System.out.println("login page:");
return null;
}
@RequestMapping(value="register", method=RequestMethod.POST)
public String register(@ModelAttribute("user") Register user, BindingResult result)
{
System.out.println("register:"+user.getUsername());
return "login";
}
}
здесь модель класса.
package com.myApps.vo;
public class Register {
private String username;
private 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;
}
}
когда я пытаюсь запустить этот проект, я получаю какое-то исключение, я связал много пути, но я не смог решить это
message An exception occurred processing JSP page /WEB-INF/views/login.jsp at line 30
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/views/login.jsp at line 30
27:
28: <form:form class="register-form" action="${registerUrl}"
29: method="post" modelAttribute="user">
30: <spring:bind path="username">
31: <div class="form-group ${status.error ? 'has-error': ''}">
32: <form:input type="text" path="username" placeholder="name" />
33: <form:errors path="username" />
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:574)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:461)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1244)
org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1027)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:971)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
javax.servlet.ServletException: javax.servlet.jsp.JspTagException: Neither BindingResult nor plain target object for bean name 'user' available as request attribute
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:909)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:838)
org.apache.jsp.WEB_002dINF.views.login_jsp._jspService(login_jsp.java:483)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1244)
org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1027)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:971)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)