Struts2基本程序演示

Struts2启动配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <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>

Struts2主配置文件

<?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>

    <constant name="struts.enable.DynamicMethodInvocation" value="false" />
    <constant name="struts.devMode" value="true" />
    <!--默认就是UTF-8 所以不配置也行-->
    <!--<constant name="struts.i18n.encoding" value="UTF-8"/>-->

    <package name="default" namespace="/" extends="struts-default">
        <action name="index">
            <result>/WEB-INF/main.jsp</result>
        </action>
    </package>

    <!--struts2qs模块-->
    <include file="org/zln/struts2qs/cfg/struts2_struts2qs.xml"/>

</struts>

Struts2模块文件配置

<?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>

    <!--国际化资源-->
    <constant name="struts.custom.i18n.resources" value="org/zln/struts2qs/resource/messageResource"/>

    <!--struts2qs模块-->
    <package name="struts2qs" namespace="/struts2qs" extends="struts-default">
        <!--登录界面-->
        <action name="loginUI" class="org.zln.struts2qs.action.LoginAction" method="loginUI">
            <result name="success">/WEB-INF/struts2qs/loginForm.jsp</result>
        </action>
        <!--登录动作-->
        <action name="loginDo" class="org.zln.struts2qs.action.LoginAction" method="loginDo">
            <result name="success">/WEB-INF/struts2qs/welcome.jsp</result>
            <result name="input">/WEB-INF/struts2qs/loginForm.jsp</result>
        </action>
        <!--获取书籍-->
        <action name="getBooks" class="org.zln.struts2qs.action.BookAction" method="getBook">
            <result name="success">/WEB-INF/struts2qs/showBooks.jsp</result>
            <result name="login">/WEB-INF/struts2qs/loginForm.jsp</result>
        </action>
    </package>

</struts>

Action

package org.zln.struts2qs.action;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.commons.lang3.StringUtils;

/**
 * Created by sherry on 15-7-8.
 */
public class LoginAction extends ActionSupport {
    private String username;
    private String password;

    //登录界面
    public String loginUI(){
        return SUCCESS;
    }
    //登录动作
    public String loginDo(){
        System.out.println("获取参数：" + username + ":" + password);
        if ("zln".equals(username)
                &&"123".equals(password)){
            ActionContext.getContext().getSession().put("user",username);
            return SUCCESS;
        }else {
            return INPUT;
        }
    }

    //输入校验

    //所有方法的输入校验
    @Override
    public void validate() {
        super.validate();
    }

    //指定方法的输入校验
    public void validateLoginDo(){
        if (StringUtils.isEmpty(username)){
            //对错误信息进行了国际化 也可以直接用文字
            addFieldError("username",getText("username.required"));
        }
    }

    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;
    }
}


/*
Action访问Servlet API
间接访问
     static ActionContext     getContext()
直接访问
* */

package org.zln.struts2qs.action;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import org.zln.struts2qs.service.BookService;

/**
 * Created by sherry on 15-7-8.
 */
public class BookAction extends ActionSupport {
    private String[] books;

    public String getBook(){
        String user = (String) ActionContext.getContext().getSession().get("user");
        if ("zln".equals(user)){
            //实际开发中会从容器中获取依赖对象
            BookService bookService = new BookService();
            books = bookService.getLeeBooks();
            return SUCCESS;
        }else {
            return LOGIN;
        }
    }

    public String[] getBooks() {
        return books;
    }

    public void setBooks(String[] books) {
        this.books = books;
    }
}

jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
    String home = request.getContextPath();
%>
<html>
<head>
    <%--s:text标签输出国际化信息--%>
    <title><s:text name="loginPage"/></title>
</head>
<body>
    <form action="<%=home%>/struts2qs/loginDo.action" method="post">
        <table>
            <caption>用户登录</caption>
            <tr>
                <td>用户名：</td>
                <td><input type="text" name="username" /></td>
            </tr>
            <tr>
                <td>密 码：</td>
                <td><input type="password" name="password" /> </td>
            </tr>
            <tr>
                <td colspan="2">
                    <input type="submit" value="提交"/>
                    <input type="reset" value="重置" />
                </td>
            </tr>
        </table>
    </form>
    <hr/>
    <%--使用Struts2标签 默认提供表单输出提示--%>
    <s:form namespace="/struts2qs" action="loginDo" method="POST">
        <%--使用标签的 key 输出国际化信息--%>
        <s:textfield name="username" key="username"/>
        <s:password name="password" label="密  码"/>
        <s:submit value="提交"></s:submit>
    </s:form>
</body>
</html>

<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
    String home = request.getContextPath();
%>
<html>
<head>
    <%--使用表达式输出国际化信息--%>
    <title><s:property value="%{getText('succPage')}"/> </title>
</head>
<body>
    欢迎，${sessionScope.user}，您已经登录！<br/>
    <a href="<%=home%>/struts2qs/getBooks.action">获取书籍列表</a>
</body>
</html>

<%@ page import="com.opensymphony.xwork2.util.ValueStack" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
    <title>书籍</title>
</head>
<body>
    <table border="1" width="360">
        <%
            /*Struts2的所有属性参数被封装在此*/
            ValueStack valueStack = (ValueStack) request.getAttribute("struts.valueStack");
            String[] books = (String[]) valueStack.findValue("books");
            for (String book:books){
                %>
                <tr>
                    <td>书名：</td>
                    <td><%=book%></td>
                </tr>
        <%
            }
        %>
    </table>
    <hr/>
    <table border="1" width="360">
        <caption>书籍</caption>
        <s:iterator value="books" status="index">
            <s:if test="#index.odd == true">
                <tr style="background-color: aqua">
            </s:if>
            <s:else>
                <tr>
            </s:else>
                    <td>书名：</td>
                    <td><s:property/></td>
                </tr>
        </s:iterator>
    </table>
    <hr/>
    <a href="${pageContext.request.contextPath}/index.action">返回首页</a>
</body>
</html>

Action访问Servlet API的方法