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java 从零开始，学习笔记之基础入门<Struts2_实战演练(中)>（三十九)

2014-02-17 09:40 991 查看

Struts2_实战演练(中)

面向切面编程

针对特定功能写出通用类，所关注的业务方面即切面

Login.Jsp->login.do
拦截器拦截login.do 所对应的action对象
拦截器可以控制action before/after ;
拦截器的内部会以被拦截的action为原始版本创建一个与之相同的action
拦截器配置：
² 声明
² 引用

Web.xml

<?xml
version="1.0"
encoding="UTF-8"?>
<web-app
version="2.5"

    xmlns="http://java.sun.com/xml/ns/javaee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<filter>
<filter-name>filterDispatcher</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>

<!—此两个配置部分针对于SiteMesh-->
    <filter>
    <filter-name>struts-cleanup</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class>
    </filter>

    <filter>
    <filter-name>sitemesh</filter-name>
    <filter-class>org.apache.struts2.sitemesh.FreeMarkerPageFilter</filter-class>
    </filter>

    <filter-mapping>
    <filter-name>sitemesh</filter-name>
    <url-pattern>/*</url-pattern>
    </filter-mapping>

    <filter-mapping>
    <filter-name>struts-cleanup</filter-name>
    <url-pattern>/*</url-pattern>
    </filter-mapping>

<filter-mapping>
<filter-name>filterDispatcher</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

</web-app>

装饰所有页面

decorators.xml

<?xml
version="1.0"
encoding="UTF-8"?>
<decorators
defaultdir="/decorator">

<excludes>
<pattern>/foodlist.jsp</pattern>
</excludes>
<decorator
name="main"
page="decorator.jsp">

<pattern>/*</pattern>
</decorator>
</decorators>

拦截器使用
配置文件

Struts.xml

<?xml
version="1.0"
encoding="UTF-8"
?>
<!DOCTYPE
struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <package
name="loginpackage"
extends="struts-default">
       
       <interceptors>
           <interceptor
name="checkUser"
class="com.ibm.myiterceptor.CheckUserInterceptor"></interceptor>
       </interceptors>

       <action
name="login"
class="com.ibm.action.LoginAction">
           <result
name="success">main.jsp</result>
           <result
name="input">fail.jsp</result>
       </action>

       <action
name="showfoodlist"
class="com.ibm.action.FoodOperAction">
           <result
name="success">foodlist.jsp</result>
           <result
name="input">main.jsp</result>
           
           <interceptor-ref
name="checkUser"></interceptor-ref>
           <interceptor-ref
name="defaultStack"></interceptor-ref>
       </action>

    </package>

</struts>

Index.jsp

<%@
page language="java"
import="java.util.*"
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>用户登录页面</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="message"/>

    用户登录
    <hr/>
    <form
action="login.do"
method="post"
name="loginform"
id="loginform">
       用户姓名：<input
type="text"
name="uname"
id="uname">
       <br/>
       用户密码：<input
type="text"
name="upwd">
       <br/>
              <input
type="submit"
value="用户登录"/>
    </form>

</body>
</html>

经过配置文件指定后跳转到LoginActin.java中，默认执行execute方法

LoginAction.java

package com.ibm.action;

import java.util.Map;

import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionSupport;

public
class LoginAction extends ActionSupport
implements SessionAware{

    private String
uname;

    private String
upwd;

    private
Map session;

    //提示消息
    private String
message;

    @Override
    public String execute()
throws Exception {
       //进行判断，如果用户输入框不为空则把session中放入值，返回“success”,跳转到main.jsp
       if(uname!=null){
           session.put("userName",
uname);
           return
"success";
       }
       return
"input";
    }

    public String getUname() {
       return
uname;
    }

    public
void setUname(String uname) {
       this.uname = uname;
    }

    public String getUpwd() {
       return
upwd;
    }

    public
void setUpwd(String upwd) {
       this.upwd = upwd;
    }

    public
void setSession(Map<String, Object> arg0) {
       this.session=arg0;

    }

    public String getMessage() {
       return
message;
    }

    public
void setMessage(String message) {
       this.message = message;
    }
}

点击showfoodlist跳转到FoodOperAction.java执行默认方法execute
Main.jsp

Main.jsp

<%@
page language="java"
import="java.util.*"
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>系统导航</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>
    系统导航
<a
href="showfoodlist.do">食品列表</a>
//escape为false指的是可以使用html标记语言，并生效
    <s:property
value="message"
escape="false"/>

</body>
</html>

此处有拦截器

CheckUserInterceptor.java

package com.ibm.myiterceptor;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

/**
* 用户检查拦截器
* @author Administrator
*
*/
public
class CheckUserInterceptor extends AbstractInterceptor {
//
// @Override
// public String intercept(ActionInvocation arg0) throws Exception {
//     //得到被拦截的Action的上下文信息
//     ActionContext context=arg0.getInvocationContext();
//
//     Map map=context.getSession();
//     String uName=(String) map.get("userName");
//如果用户名不为空则放行，否则不放行
//     if(uName!=null){
//         return arg0.invoke();
//     }
//     context.put("message", "请登录后再来访问<a
href='index.jsp'>登录</a>");
//     return "input";
// }



    /**
    * 设计权限校验
    */
    public String intercept(ActionInvocation arg0)
throws Exception{
       //此部分的内容是需要根据登录的用户名称入库进行查询的
       //利用hibernate查询出用户的权限列表

       //伪代码部分
假设用户有showfoodlist
addfood的权限
       List<String> list = new ArrayList<String>();
       list.add("showfoodlist");
       list.add("addfood");

       //得到拦截的Action的上下文信息
       ActionContext context = arg0.getInvocationContext();
       System.out.println("用户访问的栏目:"+context.getName());

       String actionName=context.getName();
       if (list.contains(actionName)) {
           return arg0.invoke();
       }
       context.put("message","权限不足，此部分功能受限");
       return
"input";
    }

}

FoodOperAction.java

package com.ibm.action;

import com.opensymphony.xwork2.ActionSupport;

public
class FoodOperAction extends ActionSupport{
    private String
message;

    @Override
    public String execute()
throws Exception {
       System.out.println("访问成功");
       return
"success";
    }

    public String getMessage() {
       return
message;
    }

    public
void setMessage(String message) {
       this.message = message;
    }

}

拦截放行后正常跳转到foodlist.jsp页面

foodlist.jsp

动态代理

Isaler.java

package com.ibm.proxydemo;

/**
* 统一的规则
* @author Administrator
*
*/
public
interface ISaler {

public
void buy(int num);

}

CpuSaler.java

package com.ibm.proxydemo;

public
class CpuSaler implements ISaler{

    public
void buy(int num) {
       System.out.println("买"+num+"个CPU");

    }

}

KeyBoardSaler.java

package com.ibm.proxydemo;

public
class KeyBoardSaler implements ISaler{

    public
void buy(int num) {
       System.out.println("买"+num+"个键盘");
    }


}

SaleProxyer.java

package com.ibm.proxydemo;

public
class SaleProxyer {
    ISaler isaler;

    public SaleProxyer(ISaler isaler) {
       this.isaler=isaler;
    }

    public
void buy(int num) {
       System.out.println("买的商品是："+isaler.getClass().getName());
       System.out.println("客户买了"+num+"个");

    }

}

Test.java(非动态代理测试)

package com.ibm.proxydemo;

public
class Test {

    public
static void main(String[] args) {
       SaleProxyer saleProx=new SaleProxyer(new CpuSaler());
       saleProx.buy(3);
    }

}

动态代理

DySaleProxy.java（动态代理）

package com.ibm.proxydemo.dynamicproxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

public
class DySaleProxy implements InvocationHandler{

    private
static Object targetObj;

    //此构造函数
非使用者自行调用，由JAVA自行控制调用
    //此构造函数的作用即将产生的代理对象作为invoke方法中的
    //目标对象参数
    public DySaleProxy(Object obj){
       System.out.println("产生的目标对象是："+obj.getClass().getName());
       this.targetObj=obj;
    }

    public
static Object getProxy(Object delegate){
       //根据调用的对象类型
动态产生匹配的代理类，因为指定的调用类类型不确定，所有用Object代替
       Object obj=Proxy.newProxyInstance(delegate.getClass().getClassLoader(),
              delegate.getClass().getInterfaces(),
              new DySaleProxy(delegate));
       return obj;

    }

    public Object invoke(Object proxy, Method method, Object[] args)
           throws Throwable {

       System.out.println("传递的参数是："+args[0]);
       return method.invoke(targetObj, args);
    }


}

Test.java(动态代理测试)

package com.ibm.proxydemo.dynamicproxy;

import com.ibm.proxydemo.ISaler;
import com.ibm.proxydemo.KeyBoardSaler;

public
class Test {

    public
static void main(String[] args) {
       ISaler proxy= (ISaler) DySaleProxy.getProxy(new KeyBoardSaler());
       proxy.buy(210);
    }
}

日期类型转换

Index.jsp

<%@
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 'index.jsp' starting page</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>
用户注册
<hr>
    <form
action="register.do"
name="userform"
id="userform">
       用户姓名：<input
type="text"
name="uname"
id="uname"/>
       <br/>
       用户年龄：<input
type="text"
name="age"
id=age/>
       <br/>
       出生日期：<input
type="text"
name="birthday"
id="birthday"/>
       <br/>
       <input
type="submit"
value="用户注册"/>
    </form>
</body>
</html>

Struts.xml

UserOperAction.java

package com.ibm.action;

import java.util.Date;

import com.opensymphony.xwork2.ActionSupport;

public
class UserOperAction extends ActionSupport{
    private String
uname;

    private
int age;

    private Date
birthday;

    public String getUname() {
       return
uname;
    }

    public
void setUname(String uname) {
       this.uname = uname;
    }

    public
int getAge() {
       return
age;
    }

    public
void setAge(int age) {
       this.age = age;
    }

    public Date getBirthday() {
       return
birthday;
    }

    public
void setBirthday(Date birthday) {
       this.birthday = birthday;
    }

    @Override
    public String execute()
throws Exception {
       System.out.println("转换后的日期："+birthday);
       return
"success";
    }


}

DtConvert.java（第一种转换方式）

package com.ibm;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;

import ognl.DefaultTypeConverter;

/**
* 类型转换器
* @author Administrator
*
*/
public
class DtConvert extends DefaultTypeConverter{

    public Object convertValue(Map context, Object value,
Class toType) {

       DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
       Date dt=null;
       String dtStr="";
       if(Date.class==toType){
           //页面到Action
           try {
              dt=df.parse(((String[])value)[0]);
           } catch (ParseException e) {
              e.printStackTrace();
           }
           return dt;
       }else{
           System.out.println("value的类型是："+value.getClass().getSimpleName());
           //action到页面

           dtStr=df.format(value);
           return dtStr;
       }
    }

    public
static void main(String[] args) {
       DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
       System.out.println(df.format(new Date()));

       String str="2012-04-25 11:35:33";
       Date dt;
       try {
           dt = df.parse(str);
           System.out.println(dt);
       } catch (ParseException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
    }



}

UserOperAction-conversion.properties(属性文件配置，命名名称前面（UserOperAction）与类名一致，后面
（conversion）固定）

birthday=com.ibm.DtConvert

常用类型转换器（第二种转换方式）

DataConvert.ava

package com.ibm.convert;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;

import org.apache.struts2.util.StrutsTypeConverter;

public
class DataConvert extends StrutsTypeConverter{

    /**
    * 页面到action的转换
    */
    @Override
    public Object convertFromString(Map arg0, String[] arg1,
Class arg2) {
       // TODO Auto-generated method stub
       DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
       Date dt = null;
       //判断页面输入框中用户是否输入了内容
       if(arg1[0]!=null){
           //用户输入的内容是否要转换成日期类型
           if(arg2==Date.class){
              try {
                  dt=df.parse(arg1[0]);
              } catch (ParseException e) {
                  e.printStackTrace();
              }
              return dt;
           }
       }
       return
null;
    }

    /**
    * 把action中的数据内容转换成String类型后输出到页面
    */
    @Override
    public String convertToString(Map arg0, Object arg1) {
       DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
       String str="";
       if(arg1!=null){
           str=df.format(arg1);
       }
       return str;
    }
}

xwork-conversion.properties（全局的）

java.util.Date=com.ibm.convert.DataConvert

用户输入信息的校验

UserOperAction.java(手动校验)

package com.ibm.action;

import java.util.Date;

import org.apache.struts2.interceptor.validation.SkipValidation;

import com.opensymphony.xwork2.ActionSupport;

public
class UserOperAction extends ActionSupport{
    private String
uname;

    private Integer
age;

    private Date
birthday;

    public String getUname() {
       return
uname;
    }

    public
void setUname(String uname) {
       this.uname = uname;
    }

    public Integer getAge() {
       return
age;
    }

    public
void setAge(Integer age) {
       this.age = age;
    }

    public Date getBirthday() {
       return
birthday;
    }

    public
void setBirthday(Date birthday){
       this.birthday = birthday;
    }

    //系统缺省不予验证的方法(跳过验证)
    //@SkipValidation
    public String execute()
throws Exception {
       System.out.println("转换后的日期："+birthday);
       return
"success";
    }

    //此方法用来校验用户输入的信息,手动校验
// @Override
// public void validate() {
////       super.validate();
//     if((uname)!=null&&uname.length()>4){
//         addFieldError("msg","输出的内容超出了制定的范围，请重新输入");
//     }
//
// }
}

配置文件中校验

UserOperAction-conversion.properties（配置文件中校验）

<?xml
version="1.0"
encoding="UTF-8"?>
<!DOCTYPE
validators PUBLIC
        "-//OpenSymphony Group//XWork Validator 1.0.2//EN"
        "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">
        
<validators>
    <field
name="uname">

        <field-validator
type ="requiredstring">

            <param
name="trim">true</param>

           <message>用户名不合法</message>
        </field-validator>

    </field>

    <field
name="age">
      <field-validator
type="required">
          <message>You must enter a value for age.</message>
      </field-validator>
      <field-validator
type="int">
           <param
name="min">13</param>
           <param
name="max">19</param>
          <message>age between ${min} and ${max} current age is ${age}</message>
      </field-validator>
    </field>

</validators>

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标签： java 基础学习笔记 struts2 入门

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