环境搭建
环境：
- Intellij IDEA
- Spring MVC
完整的项目文件结构如下所示：
Student.java
package com.ktao.controller;
public class Student {
private Integer age;
private String name;
private Integer id;
public void setAge(Integer age) {
this.age = age;
}
public Integer getAge() {
return age;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setId(Integer id) {
this.id = id;
}
public Integer getId() {
return id;
}
}
StudentController.java
package com.ktao.controller; import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.portlet.ModelAndView; @Controller
public class StudentController { @RequestMapping(value = "/student",method = RequestMethod.GET)
public ModelAndView student(){
return new ModelAndView("student","command",new Student());
} @RequestMapping(value = "/addStudent", method = RequestMethod.POST)
public String addStudent(Student student,ModelMap model) {
model.addAttribute("name", student.getName());
model.addAttribute("age", student.getAge());
model.addAttribute("id", student.getId()); return "result";
}
}
配置文件
web.xml
FormHanding-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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:component-scan base-package="com.ktao.controller"/> <!--视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
视图文件
student.jsp
<%@ page contentType="text/html; charset=UTF-8" %>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<jsp:useBean id="command" class="com.ktao.controller.Student" scope="request" ></jsp:useBean> <html>
<head>
<title>Spring MVC表单处理</title>
</head>
<body> <h2>Student Information</h2>
<form:form method="POST" action="addStudent">
<table>
<tr>
<td><form:label path="name">名字：</form:label></td>
<td><form:input path="name" /></td>
</tr>
<tr>
<td><form:label path="age">年龄：</form:label></td>
<td><form:input path="age" /></td>
</tr>
<tr>
单<td><form:label path="id">编号：</form:label></td>
<td><form:input path="id" /></td>
</tr>
<tr>
<td colspan="2"> <input type="submit" value="提交表单"/>
</td>
</tr>
</table>
</form:form>
</body>
</html>
result.jsp
<%@ page contentType="text/html; charset=UTF-8" %>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<head>
<title>Spring MVC表单处理</title>
</head>
<body> <h2>提交的学生信息如下 - </h2>
<table>
<tr>
<td>名称：</td>
<td>${name}</td>
</tr>
<tr>
<td>年龄：</td>
<td>${age}</td>
</tr>
<tr>
<td>编号：</td>
<td>${id}</td>
</tr>
</table>
</body>
</html>
运行结果
报错分析
错误1
错因：lib文件包不完整
解决方法：
错误2
javax.servlet.jsp.JspTagException: Neither BindingResult nor plain target object for bean name 'command' available as request attribute
方法：
1为抛出异常原因，2为异常解决方法。
1. 原因： 进入spring：bind标签源码你可以看到
Object target = requestContext.getModelObject(beanName);
if (target == null) {
throw new IllegalStateException("Neither BindingResult nor plain target object for bean name '" +
beanName + "' available as request attribute");
}
beanName= <spring:bind path="command.spjg">的绿色部分
如果你是直接对某个页面进行请求，那么request中还没command这个对象
2.
在页面上加上
<jsp:useBean id="command" class="com.mvc.domain.BlogForm" scope="request" ></jsp:useBean>
红色部分填上你的绑定类
解释一下，这个command类似于struts的引用的form对象，使用jsp:userBean是引用在spring-mvc.xml配置文件中的command对象。
