Spring MVC - 表单处理示例

环境搭建

环境:

  • Intellij IDEA
  • Spring MVC

Spring MVC - 表单处理示例

完整的项目文件结构如下所示:

Spring MVC - 表单处理示例

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

Spring MVC - 表单处理示例

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>

Spring MVC - 表单处理示例

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

Spring MVC - 表单处理示例

Spring MVC - 表单处理示例

报错分析

错误1

Spring MVC - 表单处理示例

错因:lib文件包不完整

解决方法:

Spring MVC - 表单处理示例

错误2

Spring MVC - 表单处理示例

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。

Spring MVC - 表单处理示例

Spring MVC - 表单处理示例
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