struts2使用模型传值

时间：2022-09-23 16:00:31

用户bean

package userBeans;

public class User {

    private String username;

    public String getUsername() {

        return username;

    }

    public void setUsername(String username) {

        this.username = username;

    }

    @Override

    public String toString() {

        return "User [username=" + username + "]";

    }

}

action

package Actions;

import com.opensymphony.xwork2.Action;

import com.opensymphony.xwork2.ActionSupport;

import com.opensymphony.xwork2.ModelDriven;

import userBeans.User;

public class loginAction extends ActionSupport implements ModelDriven<User>{

    private User user =new User();

    @Override

    public String execute() throws Exception {

        return Action.SUCCESS;

    }

    @Override

    public User getModel() {

        // TODO Auto-generated method stub

        return user;

    }

    @Override

    public void validate() {

        //在沒有使用beans的情況下 可以用null 来进行比较

        if (user.getUsername().equals("")) {

            addFieldError("username", "用户名不能为空");

        }

    }

}

struts 中需要注意

<!DOCTYPE struts PUBLIC

        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

        "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

    <constant name="struts.i18n.encoding" value="GBK" />

    <package name="default" extends="struts-default">

    <action name="userAction" class="Actions.loginAction">

            <result name="success">/result.jsp</result>

            //这里的name 为input 在vaildada执行错误时执行该//代码  不写将不会正确

            <result name="input">/index.jsp</result>

        </action>

    </package>

</struts>

其他代码

<%@ page language="Java" contentType="text/html; charset=UTF-8"

    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="<%=basePath%>">

<title>??</title>

<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="cache-control" content="no-cache">

<meta http-equiv="expires" content="0">

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="This is my page">

</head>

<body>

    <s:fielderror />

    <form action="userAction" method="post">

        <s:textfield name="username" label="验证信息"></s:textfield>

        <s:submit value="验证"></s:submit>

    </form>

</body>

</html>
<%@ page language="Java" contentType="text/html; charset=UTF-8"

    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="<%=basePath%>">

    <title>??</title>

  <meta http-equiv="pragma" content="no-cache">

  <meta http-equiv="cache-control" content="no-cache">

  <meta http-equiv="expires" content="0">

  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

  <meta http-equiv="description" content="This is my page">

 </head>

 <body>

 <s:property value="username"/>

 </body>

</html>
<?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"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

    id="WebApp_ID" version="2.5">

    <display-name>strutsDemo</display-name>

    <welcome-file-list>

        <welcome-file>index.html</welcome-file>

        <welcome-file>index.htm</welcome-file>

        <welcome-file>index.jsp</welcome-file>

        <welcome-file>default.html</welcome-file>

        <welcome-file>default.htm</welcome-file>

        <welcome-file>default.jsp</welcome-file>

    </welcome-file-list>

    <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>

</web-app>

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