第二十四天 框架之痛-Spring MVC(四）
6月3日，晴。“綠樹濃陰夏日長。 樓臺倒影入池塘。 水晶簾動微風起， 滿架薔薇一院香”。
以用戶註冊過程為例。我們可能會選擇繼承AbstractController來實現表單的顯示。
1、導入spring-framework-2.5.6的jar包，詳見第八天 框架之痛-Spring MVC(一）。
2、編寫web.xml 的配置文件。主要增加spring Web MVC框架提供的
org.springframework.web.filter.CharacterEncodingFilter用於解決POST方式造成的中文亂碼問題。
<?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_3_0.xsd" id="WebApp_ID" version="3.0"> <filter> <filter-name>CharacterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>CharacterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <servlet> <servlet-name>myOneMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>myOneMVC</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
<?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-2.5.xsd">
<bean name="/reg" class="edu.eurasia.controller.RegControl"></bean>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
package edu.eurasia.controller;
import org.springframework.validation.BindException;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;
public class RegControl extends SimpleFormController {
public RegControl() {
setCommandClass(User.class);
}
@Override
protected ModelAndView onSubmit(Object object, BindException errors)
throws Exception {
User user=(User)object;
ModelAndView mav = new ModelAndView("hello");
mav.addObject("user", user);
return mav;
}
}
RegControl.java繼承SimpleFormController類，構造器中調用setCommandClass方法綁定定命令對象（這裏為User類），轉換object為User類進行業務邏輯操作。onSubmit()方法能夠返回一個ModelAndView對象，完畢向頁面輸出數據的功能。
5、表單相應的POJO-User.java
package edu.eurasia.controller;
public class User {
private String username;
private int age;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
6、表單填寫頁面index.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>Insert title here</title>
</head>
<body>
<form action="reg" method="post">
用戶名：<input type="text" name="username"><br/>
年齡：<input type="text" name="age"><br/>
<input type="submit">
</form>
</body>
</html> 7、返回一個對應的給client頁面hello.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>Insert title here</title>
</head>
<body>
Brazil世界杯，你好！<br/>
用戶名：${user.username }<br/>
年齡：${user.age }
</body>
</html>
8、執行Tomcat 7 。輸入http://localhost:8080/springMVC_controllerweb_1/index.jsp
項目結構圖
第二十四天 框架之痛-Spring MVC(四）