Spring MVC作为目前主流的开发框架之一,其覆盖了庞杂的知识体系,我们之前已经介绍了很多关于Spring MVC的知识,但是还是有很多容易被我们平时忽视的知识点,比如说本文要讲的Spring MVC封装表单数据源码。
我们先来看看什么是数据封装(Data Encapsulation),笼统地讲,就是把业务数据映射到某个封装协议的净荷中,然后填充对应协议的包头,形成封装协议的数据包,并完成速率适配。所以,这一过程在Spring MVC框架开发过程中也是必不可少的,下面我们来看Spring MVC封装表单数据源码。
1.domain类
package com.xiaostudy.domain;
public class User {
private int id;
private String username;
private String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
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;
}
@Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", password=" + password + "]";
}
}
2.填写表单数据的JSP
<%@ 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>springMVC</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/command.do" method="post">
ID:<input type="text" name="id" id="id"/>
姓名:<input type="text" name="username" id="username"/>
密码:<input type="password" name="password" id="password"/>
<input type="submit" value="提交"/>
</form>
</body>
</html>
3.springmvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
<!-- ====================== -->
<!-- 配置处理器映射器,springmvc默认的处理器映射器
BeanNameUrlHandlerMapping:根据bean(自定义Controler)的name属性的url去寻找hanler(Action:Controller) -->
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
<bean name="/toadd.do" class="com.xiaostudy.ToAddController"/>
<bean name="/command.do" class="com.xiaostudy.CommandController"/>
<!-- 配置sprigmvc视图解析器:解析逻辑试图
后台返回逻辑试图:index
视图解析器解析出真正物理视图:前缀+逻辑试图+后缀====/WEB-INF/index.jsp -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
4.负责跳转到add.jsp的类
package com.xiaostudy;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
public class ToAddController implements Controller{
public ModelAndView handleRequest(HttpServletRequest request,
HttpServletResponse response) throws Exception {
ModelAndView mv = new ModelAndView();
//调转到add添加页面视图
mv.setViewName("add");
return mv;
}
}
5.处理表单数据类
package com.xiaostudy;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.validation.BindException;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractCommandController;
import com.xiaostudy.domain.User;
public class CommandController extends AbstractCommandController {
public CommandController() {
this.setCommandClass(User.class);
}
@Override
protected ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object command, BindException arg3)
throws Exception {
User user = (User)command;
ModelAndView mv = new ModelAndView();
mv.addObject("user", user);
mv.setViewName("index");
return mv;
}
}
6.返回到jsp中
<%@ 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>springMVC_demo</title>
</head>
<body>
${user.id }||${user.username }||${user.password }
</body>
</html>
上述的六个部分是Spring MVC封装表单数据的核心源码,缺一不可。当然,根据不同的开发环境和配置需要适当的调整一些代码,具体可以参考本站的Spring MVC视频教程,里面有整个Spring MVC框架的源码。
QCode09-04 14:38
Code大师09-04 14:50
不写代码你养我啊08-23 11:14
不写代码你养我啊09-17 18:02
要学习了06-18 18:13