在写一个使用spring3 的form标签的例子时,一直报错,错误信息为:java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name ‘user‘ available as request attribute 。具体信息为:
- 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:141)
- at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:174)
- at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:194)
- at org.springframework.web.servlet.tags.form.LabelTag.autogenerateFor(LabelTag.java:129)
- at org.springframework.web.servlet.tags.form.LabelTag.resolveFor(LabelTag.java:119)
- at org.springframework.web.servlet.tags.form.LabelTag.writeTagContent(LabelTag.java:89)
- 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.WEB_002dINF.jsp.register_jsp._jspx_meth_sf_005flabel_005f0(register_jsp.java:255)
- at org.apache.jsp.WEB_002dINF.jsp.register_jsp._jspService(register_jsp.java:140)
- at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
- at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
- at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
- at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
- at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
- at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
- at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
- at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
- at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
- at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
- at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
- at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
- at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047)
- at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817)
- at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
- at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
- at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
- at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
- at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
- at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
- at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
- at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
- at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
- at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
- at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
- at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
- at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
- at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
- at java.lang.Thread.run(Thread.java:662)
在网上找了好长时间都不是原因所在,一直在想form标签中的modelAttribute是怎么跟project中相应的类联系在一起的,同事说是根据<form:input path="field"/>中的path attribute跟相应类中的field对应起来,由spring像注入一样给每个field赋值。所以一直在JSP页面查找原因,网上找的也都是改JSP页面,结果还是没有解决掉。
错误信息是“对于bean name ‘xxxx‘ 既没有BindingResult也没有普通的目标对象可以用来作为请求属性”。突然想到在进入form表单页面之前,要有一个‘xxxx‘对象才可以在表单的标签中识别出来,所以在进入该JSP页面之前的Controller类里面相应的方法里面加上一个‘xxxx‘的对象。解决如下:
- return new ModelAndView("register").addObject(new User());
已经验证这样修改之后就不会报错。
例子的结构如图:
web.xml 的内容:
- <?xml version="1.0" encoding="UTF-8"?>
- <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
- xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
- id="WebApp_ID" version="2.5">
- <display-name>springMVCForm</display-name>
-
- <servlet>
- <servlet-name>springMVCForm</servlet-name>
- <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
- </servlet>
-
- <servlet-mapping>
- <servlet-name>springMVCForm</servlet-name>
- <url-pattern>*.do</url-pattern>
- </servlet-mapping>
-
- <context-param>
- <param-name>contextConfigLocation</param-name>
- <param-value>/WEB-INF/springMVCForm-servlet.xml</param-value>
- </context-param>
-
- <listener>
- <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
- </listener>
-
- <welcome-file-list>
- <welcome-file>index.jsp</welcome-file>
- </welcome-file-list>
- </web-app>
springMVCForm-servlet.xml 的内容:
- <?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:mvc="http://www.springframework.org/schema/mvc"
- xmlns:context="http://www.springframework.org/schema/context"
- xsi:schemaLocation="http://www.springframework.org/schema/beans
- http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
- http://www.springframework.org/schema/mvc
- http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
- http://www.springframework.org/schema/context
- http://www.springframework.org/schema/context/spring-context-3.0.xsd">
-
- <mvc:annotation-driven />
-
- <context:component-scan base-package="org.spring.wayne" />
-
- <bean id="config"
- class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
- <property name="locations">
- <list>
- <value>classpath:db-config.properties</value>
- </list>
- </property>
- </bean>
-
-
- <bean id="dataSource" class="org.apache.tomcat.dbcp.dbcp.BasicDataSource">
- <property name="driverClassName">
- <value>${db.dirverClass}</value>
- </property>
- <property name="url">
- <value>${db.url}</value>
- </property>
- <property name="username">
- <value>${db.username}</value>
- </property>
- <property name="password">
- <value>${db.password}</value>
- </property>
- </bean>
-
- <bean name="namedParameterJdbcTemplate"
- class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">
- <constructor-arg ref="dataSource" />
- </bean>
- <bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
- <constructor-arg ref="dataSource" />
- </bean>
-
- <bean
- class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
-
- <bean
- class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
-
-
- <bean id="viewResolver"
- class="org.springframework.web.servlet.view.InternalResourceViewResolver">
- <property name="viewClass"
- value="org.springframework.web.servlet.view.JstlView" />
- <property name="prefix" value="/WEB-INF/jsp/" /><!-- 跳转页面的前缀路径
- 如 /web-inf/jsp/ -->
- <property name="suffix" value=".jsp"></property>
- </bean>
- </beans>
db-config.properties的内容:
- db.url= jdbc:mysql://localhost:3306/springmvcdb?useUnicode=true&characterEncoding=utf8
-
- db.username=root
-
- db.password=
-
- db.dirverClass= com.mysql.jdbc.Driver
UserDao.class的内容:
- package org.spring.wayne.dao;
-
- import org.spring.wayne.dao.basic.BasicDao;
-
- @Repository
- public class UserDao extends BasicDao {
-
- public void addUser(User user) {
- String SQL = "INSERT INTO TBL_USER(USERNAME ,PASSWORD) VALUES(‘" + user.getUserName() + "‘ ,‘"
- + user.getPassword() + "‘)";
- getJdbcTemplate().execute(SQL);
- }
-
- }
BasicDao.class的内容:
- package org.spring.wayne.dao.basic;
-
- import org.springframework.beans.factory.annotation.Autowired;
-
- public class BasicDao {
-
- @Autowired
- private JdbcTemplate jdbcTemplate;
-
- @Autowired
- private NamedParameterJdbcTemplate namedParameterJdbcTemplate;
-
- public JdbcTemplate getJdbcTemplate() {
- return jdbcTemplate;
- }
-
- public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
- this.jdbcTemplate = jdbcTemplate;
- }
-
- public NamedParameterJdbcTemplate getNamedParameterJdbcTemplate() {
- return namedParameterJdbcTemplate;
- }
-
- public void setNamedParameterJdbcTemplate(NamedParameterJdbcTemplate namedParameterJdbcTemplate) {
- this.namedParameterJdbcTemplate = namedParameterJdbcTemplate;
- }
- }
UserService.class的内容:
- package org.spring.wayne.service;
-
- import org.spring.wayne.web.form.User;
-
- public interface UserService {
-
- public void addUser(User user);
-
- }
UserServiceImpl.class的内容:
- package org.spring.wayne.service.impl;
-
- import org.spring.wayne.dao.UserDao;
- @Service
- public class UserServiceImpl implements UserService {
- @Autowired
- private UserDao userDao;
-
- @Override
- public void addUser(User user) {
- userDao.addUser(user);
- }
-
- }
RegController.class的内容:
- package org.spring.wayne.web.controller;
-
- import javax.validation.Valid;
-
- @Controller
- public class RegController {
-
- @Autowired
- private UserService userService;
-
- @RequestMapping("/register.do")
- public String handler(@ModelAttribute("user") @Valid User user, BindingResult result, Model model) {
- if (!result.hasErrors()) {
- model.addAttribute("userName", user.getUserName());
- model.addAttribute("password", user.getPassword());
- userService.addUser(user);
- return "welcome";
- } else
- return "register";
- }
- }
WelcomeController.class的内容:
- package org.spring.wayne.controller;
-
- import org.spring.wayne.web.form.User;
- import org.springframework.stereotype.Controller;
- import org.springframework.web.bind.annotation.RequestMapping;
- import org.springframework.web.servlet.ModelAndView;
-
- @Controller
- public class WelcomeController {
-
- @RequestMapping("/welcome.do")
- public ModelAndView handler() {
- return new ModelAndView("register").addObject(new User());
- }
- }
User.class的内容:
- package org.spring.wayne.web.form;
-
- import javax.validation.constraints.NotNull;
- import javax.validation.constraints.Size;
-
- import org.hibernate.validator.constraints.NotEmpty;
-
- public class User {
-
- private String errors;
-
- @NotNull
- @NotEmpty(message = "This cannot be null")
- @Size(min = 4, max = 6, message = "length is wrong")
- private String userName;
-
- @NotNull
- @NotEmpty
- @Size(min = 6, max = 10)
- 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;
- }
-
- public String getErrors() {
- return errors;
- }
-
- public void setErrors(String errors) {
- this.errors = errors;
- }
- }
index.jsp的内容:
- <%@ page language="java" contentType="text/html; charset=UTF-8"
- pageEncoding="UTF-8"%>
- <%
- String path = request.getContextPath();
- String basePath = request.getScheme() + "://"
- + request.getServerName() + ":" + request.getServerPort()
- + path + "/";
- %>
- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- <title>The Index Page</title>
- </head>
- <body>
- <h3>
- <a href="<%=basePath %>welcome.do">Click here to start</a>
- </h3>
- </body>
- </html>
register.jsp的内容:
- <%@ page language="java" contentType="text/html; charset=UTF-8"
- pageEncoding="UTF-8"%>
- <%@ taglib prefix="sf" uri="http://www.springframework.org/tags/form"%>
- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- <title>The Register Page</title>
- <script type="text/javascript">
- function doSubmit() {
- var sf = document.getElementById("sf");
- sf.submit();
- }
- </script>
- <style type="text/css">
- .errors {
- font-size: 12px;
- color: red;
- }
- </style>
- </head>
- <body>
- <sf:form id="sf" method="POST" modelAttribute="user"
- action="register.do">
- <sf:errors path="errors" />
- <fieldset>
- <legend>Register</legend>
- <table cellspacing="0">
- <tr>
- <td><sf:label path="userName">UserName:</sf:label>
- </td>
- <td><sf:input path="userName" />
- </td>
- <td><sf:errors path="userName" class="errors" />
- </td>
- </tr>
- <tr>
- <td><sf:label path="password">Password:</sf:label>
- </td>
- <td><sf:password path="password" />
- </td>
- <td><sf:errors path="password" class="errors" />
- </td>
- </tr>
- <tr>
- <td colspan="2"><input type="button" value="Submit"
- onClick="doSubmit()">
- </td>
- </tr>
- </table>
- </fieldset>
- </sf:form>
- </body>
- </html>
welcome.jsp的内容:
- <%@ page language="java" contentType="text/html; charset=UTF-8"
- pageEncoding="UTF-8"%>
- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- <title>The Welcome Page</title>
- </head>
- <body>
- Welcome, ${userName }, your password is ${password }!
- <br>
- <h3>This item has been inserted into the table !</h3>
- </body>
- </html>
用到的jar包包括spring3中的dist目录下的所有jar包,validation-api,hibernate-validator,slf4j-api,slf4j-log4j,log4j,commons-logging,tomcat-dbcp,mysql-connector-java-5.1.12-bin包。
运行截图如下:
运行project后的界面:
点击page中的链接后如图所示:
当UserName和Password为空时提示错误信息:
输入符合要求的UserName和Password跳转到下一个页面:
现在查询数据库可以看到一条记录:
该Spring MVC JUnit测试实例请点击(Spring MVC JUnit Test测试实例 附:读取WEB-INF下配置文件的方法)
spring3 jsp页面使用<form:form modelAttribute="xxxx" action="xxxx">报错,附连接数据库的spring MVC annotation 案例
原文:http://www.cnblogs.com/koal/p/4372825.html