开发一个JSP博客引擎 Active Your Action

上一篇文章，我们已经搭建好了一个包含 Struts2 和 hibernate annotation的开发框架，这次，我们仍然使用NetBeans 6.9 来继续我们的项目，为了使我们的博客引擎可以Active，我们需要两个Action，目前，MVC的设计模式已经是Web Application设计的主流模式，ASP .NET 也有相应的框架，现在，我们使用Struts2来做我们的MVC（Model-View-Controller，模型－视图—控制器）框架。

使用Struts2有何好处？ 

 

使用Strut2 可以使我们方便的分离请求和视图，Struts2可以很容易的将MVC中的 View 和 Controller分离开，他们之间的相互对应关系只是体现在相应的配置文件里，对Struts2而言，是体现在 struts.xml 中，struts.xml 首先是一个格式良好的xml文件，这个文件的结构如下：

<?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="User" namespace="/User" extends="struts-default">

          <action name="AddBlog" class="com.deepfounder.BlogPlay.Action.AddBlog">

            <result name="success" >

                ../admin.jsp

            </result>

          </action>

     </package>

 </struts> 

 

package 中的name 属性指定相应的包名，namespace属性指定名称空间，在package下的是action元素，用于指定具体的Action，其中的name属性指定相应的Action名称，这个名称和包名共同构成了访问这个Action的地址，比如，我们现在所定义的这个Action，访问它的地址就是

 

../User/AddBlog

 

 

 或者

../User/AddBlog.action 

*.action可写可不写。Action中的class指定了这个Action所对应的那个Java类的名称，现在，完成我们需要的Action

 

Active Your Action

首先，在我们的src目录下建立一个新的类：com.deepfounder.BlogPlay.Action.AddBlog。然后，在这个类中复制如下代码：

/*

 * To change this template, choose Tools | Templates

 * and open the template in the editor.

 */

package com.deepfounder.BlogPlay.Action;



import com.deepfounder.BlogPlay.Entity.Blog;

import com.deepfounder.BlogPlay.Entity.Categories;

import com.deepfounder.BlogPlay.util.ChineseHandle;

import com.deepfounder.BlogPlay.util.RepleseHTML;

import com.opensymphony.xwork2.ActionContext;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import org.hibernate.Criteria;

import org.hibernate.criterion.Expression;

import com.deepfounder.BlogPlay.Entity.Serveruser;

import com.deepfounder.BlogPlay.Entity.Userinfo;

/**

 *

 * @author Andy

 */

public class AddBlog extends SecondAction {



    private String blogtitle;

    private String blogtext;

    private String blogcaption;

    private Blog blog;

    private List<com.deepfounder.BlogPlay.Entity.Categories> CategoriesList;

    private String Categories;

    private String Email;

    private String CategoriesSEOID;

    private String blogBuildID;

    private Userinfo UserInfo;



    private String PostId;



    public String getPostId() {

        return PostId;

    }



    public void setPostId(String PostId) {

        this.PostId = PostId;

    }



    



    public String getBlogBuildID() {

        return blogBuildID;

    }



    public void setBlogBuildID(String blogBuildID) {

        this.blogBuildID = blogBuildID;

    }



    public String getCategoriesSEOID() {

        return CategoriesSEOID;

    }



    public void setCategoriesSEOID(String CategoriesSEOID) {

        this.CategoriesSEOID = CategoriesSEOID;

    }



    public String getBlogcaption() {

        return blogcaption;

    }



    public void setBlogcaption(String blogcaption) {

        this.blogcaption = blogcaption;

    }

    private java.util.Date date;



    public String getBlogtext() {

        return blogtext;

    }



    public void setBlogtext(String blogtext) {

        this.blogtext = blogtext;

    }



    public String getBlogtitle() {

        return blogtitle;

    }



    public void setBlogtitle(String blogtitle) {

        this.blogtitle = blogtitle;

    }



    @Override

    public String execute() {



        Initblog();

        this.SaveObject(blog);

        inItCategoriesList();

        this.AddToRequest("CategoriesList", CategoriesList);

        if (!CategoriesExist(this.blogcaption, this.Email)) {

            date = new java.util.Date();

            Categories cg = new Categories();

            cg.setCategories(this.blogcaption);

            cg.setBuildID(CategoriesSEOID);

            cg.setEmail(Email);

            this.SaveObject(cg);

        } else {

        }

        // CharSetDebug();

        // DoSomething();

        FreeSession();

        return SUCCESS;

    }



    public void Initblog() {

        blog = new Blog();

        blog.setBlogText(blogtext);

        blog.setTitle(blogtitle);

        //ChineseHandle.SaveTo(blogtext);

        blog.setBlogText(blogtext);

        blog.setTitle(blogtitle);

        blog.setCaption(blogcaption);

        blog.setCommit(0);

        blog.setVister(0);

        this.UserInfo = (Userinfo) this.GetSessionAttribute("UserInfo");

        this.Email = ((Serveruser) this.GetSessionAttribute("ServerUser")).getEmail();

        blog.setEmail(this.Email);

        date = new java.util.Date();

        blog.setBuildTime(date);

        blog.setBuildID(this.getBlogBuildID());



        blog.setBaseURL(this.UserInfo.getDoname() + "/" + com.deepfounder.BlogPlay.util.BlogFormatUrl.GetString(blog));



        blog.setSummary(RepleseHTML.Html2Text(blogtext));

    }



    public String InitPage() {

        return "ready";

    }



    public String UpdatePostInit() {

        Blog UpBlog = (Blog) this.LoadEntity(Blog.class, this.PostId);

        this.AddToRequest("Post", UpBlog);

        return "UpData";

    }

     public String UpdatePost() {

        this.Initblog();

        System.out.print("摘要："+this.blog.getSummary());

        this.UpdataEntity(this.blog);

        return "UpDataSuccess";

    }



    public void getBaseUrl() {

    }



    public void CharSetDebug() {

        ActionContext context = ActionContext.getContext();

        // HttpSession session = (HttpSession) context.getSession();

        HttpServletRequest request = (HttpServletRequest) context.get(ServletActionContext.HTTP_REQUEST);

        String str = ChineseHandle.SaveTo(this.blogtext);

        str = ChineseHandle.handleChinese(str);

        request.setAttribute("CharSetTest", str);

    }



    public void inItCategoriesList() {

        this.SessionInit();



        sess_Hib.beginTransaction();

        Criteria crit_Categories = sess_Hib.createCriteria(Categories.class);//

        crit_Categories.add(Expression.eq("email", Email));

        this.CategoriesList = crit_Categories.list();



        sess_Hib.getTransaction().commit();

        sess_Hib.close();

    }



    public boolean CategoriesExist(String CategoriesName, String Email) {

        this.SessionInit();



        sess_Hib.beginTransaction();

        Criteria crit_Categories = sess_Hib.createCriteria(Categories.class);//用于显示指定日志的留言列表。

        crit_Categories.add(Expression.eq("categories", CategoriesName));

        crit_Categories.add(Expression.eq("email", Email));

        List<Categories> TestLest = crit_Categories.list();

        sess_Hib.getTransaction().commit();

        sess_Hib.close();

        if (TestLest == null) {

            return false;

        } else {

            for (int index = 0; index < TestLest.size(); index++) {

                if (TestLest.get(index).getCategories().equals(CategoriesName)) {

                    return true;

                } else {

                    return true;

                }

            }

            return false;

        }







    }



}

 在这段代码中，我们把用于数据持久化的代码也集成在了Action里面，曾经和一位开发人员讨论这样的问题，他的意见是数据持久化模块不应该集成在Action里面，这样会降低代码的可维护性，我赞同他的观点，但是我们目前完成的是一个（非常）简单的博客引擎，这样写应该也是可以的，下面这个类是所有Action的父类：

/*

 * To change this template, choose Tools | Templates

 * and open the template in the editor.

 */

package com.deepfounder.BlogPlay.Action;



import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import org.hibernate.Criteria;

import org.hibernate.cfg.AnnotationConfiguration;

import org.hibernate.criterion.Expression;

import org.hibernate.criterion.Projections;



/**

 *

 * @author June

 */

public class SecondAction extends ActionSupport {//这个类是所有与数据库有关的Action的父类，包括分页，获取session等等。



    private org.hibernate.cfg.AnnotationConfiguration cfg;

    private org.hibernate.SessionFactory sf;

    public org.hibernate.Session sess_Hib;



    public void Load() {

        this.SessionInit();

    }



    public void SessionInit() {

        cfg = new AnnotationConfiguration();

        sf = cfg.configure().buildSessionFactory();//Session的产生工厂。

        sess_Hib = sf.openSession();

    }



    public void SaveObject(Object ob) {

        this.SessionInit();

        sess_Hib.beginTransaction();

        sess_Hib.save(ob);



        //session.save(us);

        sess_Hib.getTransaction().commit();

        sess_Hib.close();

        //return false;

    }



    public void AddToRequest(String key, Object obc) {

        ActionContext context = ActionContext.getContext();

        Map<String, Object> session = context.getSession();

        HttpServletRequest request = (HttpServletRequest) context.get(ServletActionContext.HTTP_REQUEST);

        request.setAttribute(key, obc);

    }



    public Object getRequestAttribute(String Key) {

        ActionContext context = ActionContext.getContext();

        Map<String, Object> session = context.getSession();

        HttpServletRequest request = (HttpServletRequest) context.get(ServletActionContext.HTTP_REQUEST);

        return request.getAttribute(Key);

    }



    public void AddToSession(String key, Object obc) {

        ActionContext context = ActionContext.getContext();

        Map<String, Object> session = context.getSession();

        session.put(key, obc);

    }



    public Object GetSessionAttribute(String key) {

        ActionContext context = ActionContext.getContext();

        Map<String, Object> session = context.getSession();

        return session.get(key);

    }



    public List ExecuteSQLQuery(String SQLCommand) {

        this.SessionInit();

        List list = this.sess_Hib.createSQLQuery(SQLCommand).list();



        this.sess_Hib.close();

        return list;

    }



    public Object LoadEntity(Class EntityClass, String PrmKey) {

        this.SessionInit();

        this.sess_Hib.beginTransaction();

        Object ob = this.sess_Hib.get(EntityClass, PrmKey);



        //session.save(us);

        this.sess_Hib.getTransaction().commit();

        this.sess_Hib.close();

        return ob;

    }



    public List ExecuteHQLQuery(String SQLCommand) {

        this.SessionInit();

        List list = this.sess_Hib.createQuery(SQLCommand).list();

        this.sess_Hib.close();

        return list;

    }



    public List getEntityList(Class EntityClass) {

        this.SessionInit();



        Criteria crit_Entity = sess_Hib.createCriteria(EntityClass);

        List list = crit_Entity.list();

        this.sess_Hib.close();

        return list;

    }



    public List getEntityListByPage(Class EntityClass, int PageSize, int PageCount) {

        //this.FirstResult=this.PageSize*this.PageCount;

        this.SessionInit();

        Criteria crit_Entity = sess_Hib.createCriteria(EntityClass);

        crit_Entity.setFirstResult(PageSize * (PageCount - 1));

        crit_Entity.setMaxResults(PageSize);

        List list = crit_Entity.list();

        this.sess_Hib.close();

        return list;

    }



    public List getListHandStard(List list) {

        //this.FirstResult=this.PageSize*this.PageCount;

        List NewList = new ArrayList();

        for (int i = list.size() - 1; i >= 0; i--) {

            NewList.add(0, list.get(i));

        }

        return NewList;

    }



    public int GetEntityCount(Class EntityClass) {

        this.SessionInit();

        Criteria crit_Entity = sess_Hib.createCriteria(EntityClass);

        int count = ((Integer) crit_Entity.setProjection(Projections.rowCount()).uniqueResult()).intValue();

        this.sess_Hib.close();

        return count;

    }



    public void FreeSession() {

        try {

            this.sess_Hib.close();

        } catch (Exception ex) {

        } finally {

            this.sess_Hib = null;

        }



    }



    public boolean UpdataEntity(Object Entity) {

        this.SessionInit();

        try {

            this.sess_Hib.update(Entity);

            this.sess_Hib.close();

            return true;

        } catch (Exception ex) {

            this.sess_Hib=null;

            return false;

        }

    }



    public boolean DeleteEntity(Object Entity) {

        this.SessionInit();

        try {

            this.sess_Hib.delete(Entity);

            this.sess_Hib.close();

            return true;

        } catch (Exception ex) {

            ex.printStackTrace();

            this.sess_Hib.close();

            return false;

        }

    }



    public List ExecuteEntityQuery(Class EntityClass, String Key, String Value) {

        this.SessionInit();

        Criteria crit_BlogList = sess_Hib.createCriteria(EntityClass);//也用于显示随笔列表，但是是一个侧边框列表，只显示标题和链接

        //crit_BlogList.setFirstResult(0);

        //crit_BlogList.setMaxResults(10);

        crit_BlogList.add(Expression.eq(Key, Value));

        sess_Hib.getTransaction().commit();

        List list = crit_BlogList.list();

        sess_Hib.close();

        return list;

    }

}

 

 在我们的AddBlog中，包含了一些私有的变量，大家一定奇怪这些变量时做什么用的，这些变量的目的是从前端的View页面的Post中得到相应的参数，比如 

    private String blogtitle;

    private String blogtext;

    private String blogcaption;

    private Blog blog;

    private String Categories;

    private String Email;

    private String CategoriesSEOID;

    private String blogBuildID;

    private Userinfo UserInfo; 

 

 而在相应的前端页面中，也包含了全部这些变量：

<%-- 

    Document   : admin

    Created on : 2010-9-2, 9:36:20

    Author     : Andy

--%>



<%@page import="com.deepfounder.BlogPlay.Entity.Categories"%>

<%@page import="java.util.List"%>

<%@page contentType="text/html" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

    "http://www.w3.org/TR/html4/loose.dtd">

<%

                    String path = request.getContextPath();

                    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";

                    response.setCharacterEncoding("utf-8");

                    request.setCharacterEncoding("utf-8");

                    List<Categories> CategoriesList=(List<Categories>)request.getAttribute("CategoriesList");

                    if(session.getAttribute("ServerUser")==null)

                    {

                        response.sendRedirect(basePath+"Login.jsp");

                    }



        %>



<html>

    <head>

        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

        <script type="text/javascript" src="<%=basePath%>/ckeditor/ckeditor.js"></script>

        <title>后台管理</title>

        <style>

            #AddNewCatrage{

                 border-color: #000;

                 color: #316ac5;

                 background-color: #996644;

                 width: 40%;

                 visibility:  hidden;







}

        </style>

         <script>

            var c = function(o) {

return document.getElementById(o)

};



if (window.addEventListener) {

$('blogtitle').addEventListener('input', function() {$('blogcaption').value = this.value}, false);

}



$('blogtitle').onpropertychange = function() {

    $('blogcaption').value=$('blogtitle').value;

}

       

function addOptionToSelect()

{

   AddIEAndGoogleChorm();

}

function AddbuyFireFox(){



}

function AddIEAndGoogleChorm(){

    var slt=document.getElementById("blogcaption");

   var objOption=document.createElement("OPTION");

   objOption.value=document.getElementById("Categories").value;

   objOption.text=document.getElementById("Categories").value;

   slt.add(objOption);

   //alert(slt.options.length);

   slt.options[slt.options.length-1].selected='selected';

}



function getvalue()

{

   var slt=document.getElementById("blogcaption");

   alert(slt.value);

}

function ChangeVisionAble()

{

    document.getElementById("AddNewCatrage").style.append("visibility:visible;");

    //document.getElementById("Temp")

    document.getElementById("Temp").append(Document.getElementById("AddNewCatrage"));

}

</script>



    </head>

    <body>

        

<br>

        <form action="<%= basePath%>User/AddBlog.action" method="post" >

            <a>您的随笔标题：</a><input id="blogtitle" name="blogtitle"/><br/>

            <a>您的随笔标识：</a><input id="blogBuildID" name="blogBuildID"/><br/>

            <a>您的随笔标签：</a>

            <select name="blogcaption" id="blogcaption" >

               

                <%

                   if(CategoriesList!=null)

                       {

                          for(int index=CategoriesList.size()-1;index>0;index--)

                              {

                                 out.print("<option>");

                                 out.print(CategoriesList.get(index).getCategories());

                                 out.print("</option>");

                              }

                       }

                %>

            </select>



            或者您也可以添加一个新标签，标签名：<input type="text" id="Categories" name="Categories" >标签标识符：<input type="text" id="CategoriesSEOID" name="CategoriesSEOID" ><input type="button" name="Temp" id="Temp" value="添加" onclick="addOptionToSelect()" >

            <br/><textarea id="blogtext" name="blogtext" cols="80" rows="10" ></textarea>

            <input type="submit" >

        </form>

            <div id="AddNewCatrage" name="AddNewCatrage" >

                添加一个新的标签：<br/>

                标签名：<input type="text" id="CatrageName" name="CatrageName"/>

                标签标示符：<input type="text" id="CatrageID" name="CatrageID"/>

                <input type="button" value="添加"/>

            </div>

    </body>

     <script type="text/javascript">

        //<![CDATA[

        // Replace the <textarea id="editor1"> with an CKEditor instance.

        var editor = CKEDITOR.replace('blogtext' );



       // var aboutme = CKEDITOR.replace( 'aboutme' );





        //]]>



    </script>

    <script type="text/javascript">



</script>

</html>

  这样，我们已近完成了发布博客的相关功能，下一篇文章，让我们一起讨论一下如何更好的显示我们的博客文章，让前端更富亲和力。