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Struts2中属性驱动与模型驱动
属性驱动:
LoginAction.java:
public class LoginAction extends ActionSupport implements ModelDriven<User>{ private User mdoel = new User(); @Override public User getModel() { // TODO Auto-generated method stub return this.mdoel; } public String login(){ System.out.println(this.getModel().getUsername()); System.out.println(this.getModel().getPassword()); return SUCCESS; } }User.java:
public class User { private String username; 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; } }struts.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <!-- 常量 用来改变default.properties文件中的常量的设置 --> <constant name="struts.ui.theme" value=http://www.mamicode.com/"simple">>struts-modeldriver.xml:<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="login" namespace="/" extends="struts-default"> <action name="loginAction_*" method="{1}" class="com.leaf.struts.action.LoginAction"> <result>index.jsp</result> </action> </package> </struts>web.xml中加入过滤器:<filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>login.jsp:<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@ taglib prefix="s" uri="/struts-tags" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href=http://www.mamicode.com/"">>
原理图如下:
注意事项:
1、 必须使用struts2默认的拦截器栈中的ParameterInterceptor
2、 Action中的属性和表单中的name属性的值保持一致
3、 利用valueStack.setValue方法可以赋值了
模型驱动:
LoginAction.java:
public class LoginAction extends ActionSupport{ private String username; 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 login(){ System.out.println(this.username); System.out.println(this.password); return SUCCESS; } }struts.xml:<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <!-- 常量 用来改变default.properties文件中的常量的设置 --> <constant name="struts.ui.theme" value=http://www.mamicode.com/"simple">>
struts-propertydriver.xml:<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="login" namespace="/" extends="struts-default"> <action name="loginAction_*" method="{1}" class="com.leaf.struts.action.LoginAction"> <result>index.jsp</result> </action> </package> </struts>
web.xml中加入过滤器:<filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>login.jsp:<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@ taglib prefix="s" uri="/struts-tags" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href=http://www.mamicode.com/"">>原理图如下:
从上图可以看出,ModelDriverInterceptor有两个作用:
1、 当前请求的action必须实现ModelDriver接口
2、 把model对象放入到了栈顶
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