Stryts2案例

Struts 2是一个MVC框架，以WebWork框架的设计思想为核心，吸收了Struts 1的部分优点.Struts 2拥有更加广阔的前景，自身功能强大，还对其他框架下开发的程序提供很好的兼容性。下面我们了解一下syruts2的应用

1.1引入架包

1.2创建loginAction类

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
package cn.happy.action;
 
import java.util.Map;
 
import javax.servlet.http.HttpSession;
 
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.SessionAware;
 
import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
 
public class LoginAction implements Action,SessionAware{
    private Map<String,Object> map;
    private String username;
    private String password;    <br>　　　　　//自动装配
    <strong>public String execute() throws Exception {
        if(username.equals("1")&&password.equals("1")){
             
            //解耦方式 (对Servlet Api进行封装 借助ActionContext)
            Map<String,Object> session=ActionContext.getContext().getSession();
            session.put("uname", username);
            //耦合方式
//          HttpSession session2 = ServletActionContext.getRequest().getSession();
//          session2.setAttribute("uname",getUsername());
             
             
            return SUCCESS;
        }else{
            return ERROR;
        }
         
    }</strong>
 
     
    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;
    }
 
 
    public void setSession(Map<String, Object> map) {
        this.map=map;
    }
 
}

1.3创建struts.xml文件

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
'<?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>
 
    <!-- 修改文件 tomact不用重启 -->
    <constant name="struts.devMode" value="true" />
 
    <package name="default" namespace="/" extends="struts-default">
 
        <!-- login action -->
        <strong><action name="LoginAction" class="cn.happy.action.LoginAction">
            <result name="success">login/success.jsp</result>
            <result name="login">login/login.jsp</result>
            <result name="error">login/error.jsp</result>
        </action></strong>
 
 
        <!-- 第一个action -->
        <action name="HelloWordAction" class="cn.happy.action.HelloWordAction">
            <result name="success">index.jsp</result>
        </action>
 
 
    </package>
 
</struts>

1.4配置web.xml文件

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
  <display-name></display-name>
  <strong><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></strong>
  <welcome-file-list>
    <welcome-file>login/login.jsp</welcome-file>
  </welcome-file-list>
</web-app>

1.5编写JSP页面

1.6在这里就展示一下登录页面与登录失败页面

login.jsp

 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
     
    <title>登录页面</title>
     
     
  </head>
   
  <body>
    <s:form name="form1" namespace="/" method="post" action="LoginAction">
    请输入用户名：
    <s:textfield name="username"></s:textfield><br/>
      请输入密码：
    <s:textfield name="password"></s:textfield>
    <s:reset value="重填"></s:reset>
    <s:submit value="登陆"></s:submit>
    </s:form>
  </body>
</html>

在jsp中用到了Struts2 标签

引入

1
<span style="color: #ff0000;"><strong><%@taglib uri="/struts-tags" prefix="s" %></strong></span>

通用标签(条件,迭代)

 

1.7 success.jsp

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
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>My JSP 'error.jsp' starting page</title>
 
  </head>
   
  <body>
        <h1>登录失败</h1>
    
        <h3>用户名或密码错误,请重新<a href="login/login.jsp">登录</a></h3>
        <script>
var t=10;//设定跳转的时间
setInterval("refer()",1000); //启动1秒定时
function refer(){
if(t==0){
location="http://localhost:8080/Day-login2-struts2/login/login.jsp"; //跳转的链接地址
}
document.getElementById('show').innerHTML=""+t+"秒后跳转到登录"; // 显示倒计时
t--; // 计数器递减
}
</script>
   <span id="show"></span>
     
  </body>
</html>

1
 

1.8结果展现

1.9登录成功   用户名:1 密码:1

1.10 登录失败     10秒后会跳会登录

 

 2.0拓展

当我们用到的属性多的时候都写在loginAction类中就会感觉到特别的凌乱,这个时候我们就可以创建一个类来管理这些属性(例:user)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
package cn.happy.entity;
 
public class User {
    private String name;
    private int age;
     
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
     
     
    private String username;
    private String password;
    public String getUsername() {
        return username;
    }
    public String getPassword() {
        return password;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public void setPassword(String password) {
        this.password = password;
    }
     
 
}

这时候只在loginAction类中植入这个类就行了

1
2
3
4
5
6
7
private User user;
    public User getUser() {
        return user;
    }
    public void setUser(User user) {
        this.user = user;
    }

这样代码就会显得更加的清晰,岁然这样做会让我们的眼前一亮,事物都有两面性有利就有弊。我们用到的属性名前面都要加上管理它们类的名称（如:user.getUsername）

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
public class LoginAction implements Action,ModelDriven<User>{
 
    @Override
    public String execute() throws Exception {
        if(user.getUsername().equals("1")&&(user.getPassword().equals("1"))){
            return SUCCESS;    
        }else{
            //失败回到登录
            return LOGIN;
        }
    }
    private User user;
    public User getUser() {
        return user;
    }
    public void setUser(User user) {
        this.user = user;
    }
    @Override
    public User getModel() {
        // TODO Auto-generated method stub
        return user;
    }
}

在1.2中我们可以看到加粗字体的语句解耦与耦合的应用(在下一篇博客中会有详细解释 解耦与耦合的你我他)

1
2
3
4
5
//解耦方式
Map<String,Object> session=ActionContext.getContext().getSession();<br>   session.put("uname", username);
//耦合方式
HttpSession session2 = ServletActionContext.getRequest().getSession();
  session2.setAttribute("uname",getUsername());

　　

首先我们先要在登录成功页面配置一道(success.jsp)

1
2
3
4
<body>
        欢迎你！${uname}
 
 </body>

实现效果         用户名为1　

posted @ 2016-09-25 17:01  方圆i  阅读(183)  评论(0)  编辑  收藏  举报