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Struts中ActionForm的使用及传参

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ActionForm的使用及传参

ActionForm是Struts中的模型层,它主要用于保存页面传来的参数,并用于判断是否为空,是否验证错误

第一种传参(采用JavaBean的实体做为参数,及以类作为参数)

1.login.jsp(登录界面,传参)

<%@ page language="java" pageEncoding="GB18030"%> <%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%> <%@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%> <html> <head> <title>JSP for LoginForm form</title> </head> <body> <form action="login.do"> username : <input type="text" name="user.username"/> <html:errors property="username"/><br/> userpwd : <input type="password" name="user.userpwd"/> <html:errors property="userpwd"/><br/> <input type="submit"/> </form> </body> </html>

2.User.java(JavaBean类)

package com.feng.javabean; 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; } }

3.loginForm(ActionForm,接受参数,并赋值)

package com.feng.struts.form; import javax.servlet.http.HttpServletRequest; import org.apache.struts.action.ActionErrors; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionMapping; import org.apache.struts.action.ActionMessage; import com.feng.javabean.User; public class UserloginForm extends ActionForm { User user = new User();// 接受从页面传过来的参数,并保存到User中 public User getUser() { return user; } public void setUser(User user) { this.user = user; } public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) { ActionErrors errors = new ActionErrors(); if (user.getUsername() == null || "".equals(user.getUsername())) { errors.add("username", new ActionMessage("username.null")); } if (user.getPassword() == null || "".equals(user.getPassword())) { errors.add("password", new ActionMessage("password.null")); } return errors; } public void reset(ActionMapping mapping, HttpServletRequest request) { // TODO Auto-generated method stub } }

4.loginAction(处理类)

package com.feng.struts.action; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.Action; import org.apache.struts.action.ActionErrors; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.action.ActionMessage; import org.apache.struts.action.ActionMessages; import com.feng.javabean.User; import com.feng.struts.form.UserloginForm; public class UserloginAction extends Action { public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { UserloginForm userloginForm = (UserloginForm) form; User user = userloginForm.getUser(); if (user.getUsername().equals("feng") && user.getPassword().equals("619")) { return mapping.findForward("ok"); } else { ActionErrors errors = new ActionErrors(); // errors.add("num", new ActionMessage("num.zero")); // super.saveErrors(request, errors);//此方法已经过时 ActionMessages message = new ActionMessages(); message.add("d", new ActionMessage("num.zero")); super.saveErrors(request, message); return mapping.findForward("no"); } } }

5.struts-config.xml(配置文件)

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd"> <struts-config> <data-sources /> <form-beans > <form-bean name="UserloginForm" type="com.feng.struts.form.UserloginForm" /> </form-beans> <global-exceptions /> <global-forwards /> <action-mappings > <action attribute="UserloginForm" input="/login.jsp" name="loginUserForm" path="/login" scope="request" type="com.feng.struts.action.UserloginAction" /> </action-mappings> <message-resources parameter="com.feng.struts.ApplicationResources" /> </struts-config>

6.ApplicationResources(资源文件)

username.null=\u7528\u6237\u540D\u4E0D\u80FD\u4E3A\u7A7A password.null=\u5BC6\u7801\u4E0D\u80FD\u4E3A\u7A7A

另一种传参(采用BeanUtils类传参)

1.loginForm(ActionForm)

package com.feng.struts.form; import javax.servlet.http.HttpServletRequest; import org.apache.struts.action.ActionErrors; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionMapping; public class LoginUserForm extends ActionForm { private String password; private String username; public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) { // TODO Auto-generated method stub return null; } public void reset(ActionMapping mapping, HttpServletRequest request) { // TODO Auto-generated method stub } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } }

2.loginAction(Action)

package com.feng.struts.action; import java.lang.reflect.InvocationTargetException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.beanutils.BeanUtils; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import com.feng.javabean.User; import com.feng.struts.form.LoginUserForm; public class LoginUserAction extends Action { public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { LoginUserForm loginUserForm = (LoginUserForm) form; User user = new User(); try { BeanUtils.copyProperties(user, loginUserForm);// 把ActionForm中的数据填充到User类中 } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } return null; } }

其他代码同上