Struts的Action的约定优于配置属性实战

柔情只为你懂 2021-07-24 15:18 376阅读 0赞

**一 视图**

1 index.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <title>登录页面</title>
    </head>
    <body>
    <s:form action="user/login">
        <s:textfield name="username" key="用户名"/>
        <s:textfield name="password" key="密码"/>
        <s:submit value="登录"/>
    </s:form>
    </body>
    </html>

2 login.jsp

3  login-success.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>登录成功</title>
    </head>
    <body>
        欢迎，${username},您已经登录！<br/>
        <a href="${pageContext.request.contextPath}/
            book/get-books.action">查看作者李刚已出版的图书</a>
    </body>
    </html>

4 login-error.jsp

5 get-books.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <title>作者李刚已出版的图书</title>
    </head>
    <body>
    <table border="1" width="360">
        <caption>作者李刚已出版的图书</caption>
        <s:iterator value="books" status="index">
        <s:if test="#index.odd == true">
        <tr style="background-color:#cccccc">
        </s:if>
        <s:else>
        <tr>
        </s:else>
        <td><s:text name="书名"/></td>
        <td><s:property/></td>
        </tr>
        </s:iterator>
    </table>
    </body>
    </html>

**二 action**

1 LoginAction

package org.crazyit.app.action.user;
    
    import com.opensymphony.xwork2.ActionSupport;
    import com.opensymphony.xwork2.ActionContext;
    import org.apache.struts2.dispatcher.*;
    
    import org.apache.struts2.config.*;
    
    import org.crazyit.app.service.*;
    
    
    
    public class LoginAction extends ActionSupport
    {
        // 封装请求参数的username和password成员变量
        private String username;
        private String password;
    
        // 省略所有的setter和getter方法
    
        // username的setter和getter方法
        public void setUsername(String username)
        {
            this.username = username;
        }
        public String getUsername()
        {
            return this.username;
        }
    
        // password的setter和getter方法
        public void setPassword(String password)
        {
            this.password = password;
        }
        public String getPassword()
        {
            return this.password;
        }
    
        // 处理用户请求的execute方法
        public String execute() throws Exception
        {
            if (getUsername().equals("crazyit.org")
                && getPassword().equals("leegang") )
            {
                ActionContext.getContext().getSession()
                    .put("user" , getUsername());
                return SUCCESS;
            }
            return ERROR;
        }
    }

2 GetBooksAction

package org.crazyit.app.action.book;
    
    import com.opensymphony.xwork2.Action;
    import com.opensymphony.xwork2.ActionContext;
    
    import org.apache.struts2.dispatcher.*;
    
    import org.apache.struts2.config.*;
    
    import org.crazyit.app.service.*;
    
    
    public class GetBooksAction implements Action
    {
        // 封装数据的books成员变量
        private String[] books;
        // 省略所有的setter和getter方法
    
        // books的setter和getter方法
        public void setBooks(String[] books)
        {
            this.books = books;
        }
        public String[] getBooks()
        {
            return this.books;
        }
    
        // 处理用户请求的execute方法
        public String execute() throws Exception
        {
            String user = (String)ActionContext.getContext()
                .getSession().get("user");
            if (user != null && user.equals("crazyit.org"))
            {
                // 创建业务逻辑组件，并调用业务逻辑组件的方法
                BookService bs = new BookService();
                setBooks(bs.getLeeBooks());
                return SUCCESS;
            }
            return LOGIN;
        }
    }

**三 业务层**

package org.crazyit.app.service;
    
    public class BookService
    {
        private String[] books =
            new String[]{
            "疯狂Java讲义" ,
            "轻量级Java EE企业应用实战",
            "疯狂Ajax讲义",
            "疯狂iOS讲义"
        };
    
        public String[] getLeeBooks()
        {
            return books;
        }
    }

**四 测试**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/6ea49cad519f4d1ea4b6c6647e949127.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/8b51d702677d40bea800df67df1b0924.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2]: /images/20210724/6ea445b7c6354718b79d4e85ce0ff64e.png