Struts入门初体验

一，入门小案例

1，首先引入三个jar

        <dependency>
            <groupId>javaee</groupId>
            <artifactId>javaee-api</artifactId>
            <version>5</version>
        </dependency>

        <dependency>
            <groupId>org.apache.struts</groupId>
            <artifactId>struts2-core</artifactId>
            <version>2.3.4.1</version>
        </dependency>

        <dependency>
            <groupId>org.apache.struts.xwork</groupId>
            <artifactId>xwork-core</artifactId>
            <version>2.3.4.1</version>
        </dependency>

　　2,配置web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>


  <filter>
    <filter-name>struts1</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts1</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

</web-app>

　　3,创建实体类HelloAction并实现Action

public class HelloAction implements Action{

    public String execute() throws Exception {
        return SUCCESS;
    }
}

　　4,创建配置文件struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
        <!DOCTYPE struts PUBLIC
                "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
                "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>

        <action name="hello" class="cn.happy.controller.HelloAction">
        <result name="success">index.jsp</result>
    </action>
        
    </package>
</struts>

　　5，入门小案例就写完啦，通过struts.xml中action的name名来访问。

二，登陆小案例

1，创建实体类LoginAction

    private  String username;   //用户名
    private  String password;   //登陆密码
    public String execute() throws Exception {
        //如果你的用户名和密码都是admin,return success.反之，走到login
    if(username.equals("admin")&&password.equals("admin")){
        return SUCCESS;
    }else {
        return LOGIN;
    }
 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;
    }

    }

2，配置struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
        <!DOCTYPE struts PUBLIC
                "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
                "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
        <action name="login" class="cn.happy.controller.LoginAction">
            <result name="success">day01/success.jsp</result>
            <result name="login">day01/login.jsp</result>
        </action>
    </package>
</struts>

3,开发视图登陆页面

<%@taglib prefix="s" uri="/struts-tags" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<s:form name="form1" namespace="/" method="post" action="login">
    请输入用户名：</br>  <s:textfield name="username"/>
    请输入密码：<s:password name="password"/>
    <s:submit value="登陆"></s:submit>
</s:form>

</body>
</html>

三，强化一下刚才的登陆案例，通过javaBean自动装配

1,新建实体类UserInfo

2,修改刚才的LoginAction页面

    //植入实体类
private UserInfo info=new UserInfo();

public String execute() throws Exception {
        //如果你的用户名和密码都是admin,return success.反之，走到login
    if(info.getUsername().equals("admin")&&info.getPassword().equals("admin")){ return SUCCESS; }else { return LOGIN; }

public UserInfo getInfo() {
    return info;
}

public void setInfo(UserInfo info) {
    this.info = info;
}

　　3，修改一下登陆页面

<%@taglib prefix="s" uri="/struts-tags" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<s:form name="form1" namespace="/" method="post" action="login">

请输入用户名：</br>  <s:textfield name="info.username"/>
请输入密码：<s:password name="info.password"/>

<s:submit value="登陆"></s:submit> </s:form> </body> </html>

　　4，登陆成功后success.jsp

5,这个时候登录名已经自动装配上了

四，Struts2访问Servlet API

解耦方案一：：对Servlet API进行封装，借助ActionContext