Flex4之Tree开发【三】——与JAVA后台交互的树，实现增删改查

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RIA-Flex4专栏

Java XML Flex Hibernate 数据结构

今天的第三篇文章，把我两天学习的Flex4树的最重要的与实际开发相关的示例总结一下，实现与JAVA后台交互操作也就是增删改功能

第一：首先是MXML主要代码

<?xml version="1.0" encoding="utf-8"?>
<s:Group xmlns:fx="http://ns.adobe.com/mxml/2009" 
		 xmlns:s="library://ns.adobe.com/flex/spark" 
		 xmlns:mx="library://ns.adobe.com/flex/mx" width="100%" height="100%"
		 creationComplete="init()">
	<fx:Script>
		<![CDATA[
			import mx.controls.Alert;
			import mx.rpc.events.ResultEvent;
			import mx.utils.URLUtil;
			protected function init():void{
				listResult.convertDataToXml();
			}
			var xmlList:XML;
			protected function listResult_resultHandler(event:ResultEvent):void
			{
				xmlList=XML(event.result.toString());
				mytree.dataProvider=xmlList;
				
			}
			
			protected function tree1_clickHandler(event:MouseEvent):void
			{
				if(mytree.selectedItem.hasOwnProperty("@value" ))
				{ 
					
					var u:URLRequest=new URLRequest(mytree.selectedItem.@value);
					//navigateToURL(new URLRequest(mytree.selectedItem.@value)); 
					navigateToURL(u);
				} else
				{ 
					//没有那就展开，如果展开了就收缩
					mytree.expandItem(mytree.selectedItem,!mytree.isItemOpen(mytree.selectedItem),true);
				} 
			}
			var child:XML;
			//添加兄弟节点
			protected function addBefore():void
			{
				var xml:XML=mytree.selectedItem as XML;
				var text:String=nextName.text;
				if(xml!=null && text.length>0) {
					var parent:XML=xml.parent();
					if(parent!=null) {
						child=new XML("<node foddersortName=\"\" foddersortId=\"\"  parentid=\"\" />");
						child.@foddersortName=text;
						parent.insertChildBefore(xml,child);
						var v:URLVariables = new URLVariables("method=add&editName="+text+"&parentId="+parent.@foddersortId);  
						/* 
						也可以是这种方式
						var vars: URLVariables = new URLVariables ();
						vars["varName"] = varValue;	//把参数键,值对放到vars对象中.
						vars["var2Name"] = var2Value; 
						*/	
						var r:URLRequest = new URLRequest();  
						r.url = "http://localhost:8080/FlexBlazeDS/treeOperate.do";  
						r.method = URLRequestMethod.POST;  
						r.data = v;  
						
						var l:URLLoader = new URLLoader();  		
						l.load(r);  
						
						l.addEventListener(Event.COMPLETE,txtCompleteHandler);
					} else {
						Alert.show("不能选中根节点");
					}
				} else {
					Alert.show("需要先选中节点和填入文字");
				}
			}
			
			private function txtCompleteHandler(e:Event):void  
			{  
				
				var l:URLLoader = URLLoader(e.target);  
				var o:Object = URLUtil.stringToObject(l.data,";",true);
				var result:String=o.result;
				var operateId:String=o.operateId;
				if(operateId!=null){
					//Alert.show(o.operateId);
					//每次添加完毕节点后，就需要将刚插入数据库中的最大的ID查询出来赋给刚刚新增的XML节点的属性中
					child.@foddersortId=operateId;
				}
				
				if(result=="update"){
					Alert.show("更新成功!");
				}else if(result=="delete"){
					Alert.show("删除成功!");
				}else if(result=="add"){
					Alert.show("新增成功!");
				}else{
					Alert.show("操作失败!");
				}
				
			}  
			
			
			protected function addAfter():void
			{
				var xml:XML=mytree.selectedItem as XML;
				var text:String=nextName.text;
				if(xml!=null && text.length>0) {
					var parent:XML=xml.parent();
					if(parent!=null) {
						child=new XML("<node foddersortName=\"\" foddersortId=\"\"  parentid=\"\" />");
						child.@foddersortName=text;
						parent.insertChildAfter(xml,child);
						
						var v:URLVariables = new URLVariables("method=add&editName="+text+"&parentId="+parent.@foddersortId);  
						/* 
						也可以是这种方式
						var vars: URLVariables = new URLVariables ();
						vars["varName"] = varValue;	//把参数键,值对放到vars对象中.
						vars["var2Name"] = var2Value; 
						*/	
						var r:URLRequest = new URLRequest();  
						r.url = "http://localhost:8080/FlexBlazeDS/treeOperate.do";  
						r.method = URLRequestMethod.POST;  
						r.data = v;  
						
						var l:URLLoader = new URLLoader();  		
						l.load(r);  
						
						l.addEventListener(Event.COMPLETE,txtCompleteHandler);
					} else {
						Alert.show("不能选中根节点");
					}
				} else {
					Alert.show("需要先选中节点和填入文字");
				}
			}
			
			protected function addSon():void
			{
				var xml:XML=mytree.selectedItem as XML;
				var text:String=nextName.text;
				if(xml!=null && text.length>0) {
					var parent:XML=xml.parent();
					child=new XML("<node foddersortName=\"\" foddersortId=\"\"  parentid=\"\" />");
					child.@foddersortName=text;
					xml.appendChild(child);
					mytree.expandChildrenOf(xml,true);
					
					var v:URLVariables = new URLVariables("method=add&editName="+text+"&parentId="+xml.@foddersortId);  
					/* 
					也可以是这种方式
					var vars: URLVariables = new URLVariables ();
					vars["varName"] = varValue;	//把参数键,值对放到vars对象中.
					vars["var2Name"] = var2Value; 
					*/	
					var r:URLRequest = new URLRequest();  
					r.url = "http://localhost:8080/FlexBlazeDS/treeOperate.do";  
					r.method = URLRequestMethod.POST;  
					r.data = v;  
					
					var l:URLLoader = new URLLoader();  		
					l.load(r);  
					
					l.addEventListener(Event.COMPLETE,txtCompleteHandler);
				} else {
					Alert.show("需要先选中节点和填入文字");
				}			
			}
			protected function editNode():void
			{
				var xml:XML=mytree.selectedItem as XML;
				var text:String=nextName.text;
				if(xml!=null && text.length>0) {
					xml.@foddersortName=text;
				} else {
					Alert.show("需要先选中节点和填入文字");
				}
				
				var v:URLVariables = new URLVariables("method=update&editName="+text+"&parentId="+xml.@foddersortId);  
				/* 
				也可以是这种方式
				var vars: URLVariables = new URLVariables ();
				vars["varName"] = varValue;	//把参数键,值对放到vars对象中.
				vars["var2Name"] = var2Value; 
				*/	
				var r:URLRequest = new URLRequest();  
				r.url = "http://localhost:8080/FlexBlazeDS/treeOperate.do";  
				r.method = URLRequestMethod.POST;  
				r.data = v;  
				
				var l:URLLoader = new URLLoader();  		
				l.load(r);  
				
				l.addEventListener(Event.COMPLETE,txtCompleteHandler);
			}
			protected function deleteNode():void
			{
				var xml:XML=mytree.selectedItem as XML;
				if(xml!=null) {
					var list:Array=mytree.selectedItems as Array;
					for(var k:int=0;k<list.length;k++) {
						xml=list[k] as XML;
						var parent:XML=xml.parent();
						if(parent!=null) {
							var children:XMLList=parent.children();
							for(var i:int=0;i<children.length();i++) {
								if(children[i]==xml) {
									delete children[i];
									var v:URLVariables = new URLVariables("method=delete&parentId="+xml.@foddersortId);  
									/* 
									也可以是这种方式
									var vars: URLVariables = new URLVariables ();
									vars["varName"] = varValue;	//把参数键,值对放到vars对象中.
									vars["var2Name"] = var2Value; 
									*/	
									var r:URLRequest = new URLRequest();  
									r.url = "http://localhost:8080/FlexBlazeDS/treeOperate.do";  
									r.method = URLRequestMethod.POST;  
									r.data = v;  
									
									var l:URLLoader = new URLLoader();  		
									l.load(r);  
									
									l.addEventListener(Event.COMPLETE,txtCompleteHandler);
									break;
								}
							}
						} else {
							Alert.show("不能选中根节点");
						}
					}
				} else {
					Alert.show("需要先选中节点");
				}			
			}
			protected function selectNode():void
			{
				var text:String=nextName.text;
				if(text.length>0) {
					var items:Array=[];
					var list:XMLList=new XMLList();
					list[0]=mytree.dataProvider[0];				
					searchItems(list,text,items);
					mytree.selectedItems=items;
				} else {
					Alert.show("输入查找的文字");
				}
			}
			private function searchItems(list:XMLList,find:String,items:Array):void {
				for(var i:int=0;i<list.length();i++) {
					var one:XML=list[i];
					var label:String=one.@foddersortName;
					if(label!=null && label.indexOf(find)>=0) {
						items.push(one);
					}
					searchItems(one.children(),find,items);
				}
			}
			
			
			
			protected function closeAll():void{
				mytree.openItems=[];
				
			}
			
			protected function openAll():void{
				mytree.expandChildrenOf(mytree.selectedItem,true);
			}
			
			
			
			
		]]>
	</fx:Script>
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
		<s:RemoteObject destination="findName" id="listResult" result="listResult_resultHandler(event)"/>
	</fx:Declarations>
	<s:TextInput id="nextName" x="432" y="40"  />
	<mx:Tree x="30" y="10" width="264" height="600" id="mytree"  showRoot="false" labelField="@foddersortName" ></mx:Tree>
	<s:Button x="443" y="82" label="增加为哥" click="addBefore()"/>
	<s:Button x="443" y="111" label="增加为弟" click="addAfter()"/>
	<s:Button x="444" y="144" click="addSon()" label="增加为孩子"/>
	<s:Button x="444" y="178" click="editNode()" label="修改节点"/>
	<s:Button x="444" y="211" click="deleteNode()" label="删除节点"/>
	<s:Button x="443" y="244" click="selectNode()" label="选择节点"/>
	<s:Button x="443" y="277" click="closeAll()" label="全部收缩"/>
	<s:Button x="443" y="306" click="openAll()" label="全部展开"/>
</s:Group>

这里写的是组件形式，在主程序中调用下文件名，如这个叫做FlexTree.mxml，其位于components目录下

那么在主程序中应该这样写

<components:FlexTree/>

就是这么一小行代码就可以执行主程序显示树了

第二：web-info/flex/remoteConfig.xml中关键配置

<destination id="findName" >
     <properties>
        <source>com.jadetrust.test.FindTreeNode</source>
     </properties>
     </destination>

第三：后台两个主要处理程序，一个是用来查询所有树节点拼装XML的程序FindTreeNode.java

//把数据库中的无限级联表中数据拼装成一个XML文档
	public String convertDataToXml()
	{
	   UserService sf=new UserService();
       List<TCategory> cates=sf.findCategoriesAll();
       System.out.println(cates);
       List<TCategory> listTop=sf.findCategoriesTop();
       String treedata="<?xml version='1.0' encoding='utf-8'?>\n<node foddersortId='0' foddersortName='所有分类'>\n";
	  for(TCategory cate:listTop){
		treedata=treedata+"<node foddersortId='"+cate.getCateId() +"' foddersortName='"+cate.getName()+"'>\n";
		treedata=CreateXmlNode(cates,cate.getCateId(),treedata);
		treedata=treedata+"</node>\n";
	}
	treedata=treedata+"</node>\n";
	

	System.out.println(treedata);
	return treedata;
	}
	/**
	* 递归解析list –> Xml
	*/
	public String CreateXmlNode(List<TCategory> list,int nodepid,String cratedata){
	for (int a=0;a<list.size();a++)
	{
	TCategory cate=list.get(a);
	
	if(cate.getTCategory()==null || cate.getTCategory().equals("")){
	  
	}else{
	if (cate.getTCategory().getCateId()==nodepid){
	if(cate.getTCategories()!=null){
	cratedata=cratedata+"<node foddersortId='"+cate.getCateId() +"' foddersortName='"+cate.getName()+"' parentid='"+cate.getTCategory().getCateId()+"'>\n";
	cratedata=CreateXmlNode(list,cate.getCateId(),cratedata);
	cratedata=cratedata+"</node>\n";
	}else{
	cratedata=cratedata+"<node foddersortId='"+cate.getCateId()+"'foddersortName='"+cate.getName()+"' parentid='"+cate.getTCategory().getCateId()+"'/>\n";
	}
	}
	}
	}
	return cratedata;
	}

还有一个处理增删改的servleet程序

public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		System.out.println("执行了树操作。。。。。。。。。。。。。。。");
		request.setCharacterEncoding("utf-8");
         String childName=request.getParameter("editName");
         String parentId=request.getParameter("parentId");
         String method=request.getParameter("method");
        UserService sf=new UserService();
         response.setCharacterEncoding("utf-8");
         try{
         if(method.equals("delete")){
        	 System.out.println("此次删除的ID为"+parentId);
              if(parentId!=null){
            	  TCategory cate1=sf.findById(parentId);
            	  System.out.println(cate1);
            	  sf.delete(cate1);
            	  response.getWriter().write("result=delete");
              }
        	 
         }else if(method.equals("update")){
        	 System.out.println("此次更新的ID为"+parentId);
        	 if(childName!=null&&parentId!=null){
        		  TCategory cate1=sf.findById(parentId);
        		  cate1.setName(childName);
        		  System.out.println(cate1);
        		  sf.update(cate1);
        		  response.getWriter().write("result=update");
        	 }
         }else if(method.equals("add")){
        	  if(childName!=null&&parentId!=null){
        		  TCategory category=new TCategory();
        	         category.setName(childName);
        	         TCategory cate1=sf.findById(parentId);
        	         category.setTCategory(cate1);
        	         sf.add(category);
        	         Integer lastId=sf.findLastId();
        	         response.getWriter().write("result=add;operateId="+lastId);
              }
  
         }
         }catch(Exception e){
        	 System.out.println(e.toString());
        	  response.getWriter().write("result=error");
         }
	}

第三，就是介绍相关的数据库表的结构了MYSQL

CREATE TABLE `t_category` (
`name` varchar(255) DEFAULT NULL,
`parent_id` int(11) DEFAULT NULL,
`cate_id` int(11) NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`cate_id`),
KEY `parent_id` (`parent_id`),
CONSTRAINT `t_category_ibfk_1` FOREIGN KEY (`parent_id`) REFERENCES `t_category` (`cate_id`)
) ENGINE=InnoDB AUTO_INCREMENT=59 DEFAULT CHARSET=utf8;

对应的Category实体类

package com.jadetrust.dao;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;

/**
 * TCategory entity. @author MyEclipse Persistence Tools
 */
@Entity
@Table(name = "t_category", catalog = "test")
public class TCategory implements java.io.Serializable {

	// Fields

	@Override
	public String toString() {
		return "[ cateId=" + cateId + ", name=" + name + "]";
	}

	private Integer cateId;
	private TCategory TCategory;
	private String name;
	private Set<TCategory> TCategories = new HashSet<TCategory>(0);

	// Constructors

	/** default constructor */
	public TCategory() {
	}

	/** full constructor */
	public TCategory(TCategory TCategory, String name,
			Set<TCategory> TCategories) {
		this.TCategory = TCategory;
		this.name = name;
		this.TCategories = TCategories;
	}

	// Property accessors
	@Id
	@GeneratedValue
	@Column(name = "cate_id", unique = true, nullable = false)
	public Integer getCateId() {
		return this.cateId;
	}

	public void setCateId(Integer cateId) {
		this.cateId = cateId;
	}

	@ManyToOne(fetch = FetchType.LAZY)
	@JoinColumn(name = "parent_id")
	public TCategory getTCategory() {
		return this.TCategory;
	}

	public void setTCategory(TCategory TCategory) {
		this.TCategory = TCategory;
	}

	@Column(name = "name")
	public String getName() {
		return this.name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "TCategory")
	public Set<TCategory> getTCategories() {
		return this.TCategories;
	}

	public void setTCategories(Set<TCategory> TCategories) {
		this.TCategories = TCategories;
	}
	
	
	                                  
}

第四：具体数据库操作类UserService

package com.jadetrust.service.impl;

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

import org.hibernate.Session;
import org.hibernate.Transaction;

import com.jadetrust.common.HibernateSessionFactory;
import com.jadetrust.dao.TCategory;

public class UserService {

	public void add(TCategory cate){
		Session session=HibernateSessionFactory.getSession();
		Transaction tc=session.beginTransaction();
		session.save(cate);
		tc.commit();
		session.close();
		
	}
	public void delete(TCategory cate){
		Session session=HibernateSessionFactory.getSession();
		Transaction tc=session.beginTransaction();
		session.delete(cate);
		tc.commit();
		session.close();
	}
	public void update(TCategory cate){
		Session session=HibernateSessionFactory.getSession();
		Transaction tc=session.beginTransaction();
		session.merge(cate);
		tc.commit();
		session.close();
	}
	public TCategory findById(String id){
		String hql = "from TCategory where cateId=:id";
		return (TCategory)HibernateSessionFactory.getSession().createQuery(hql).setString("id", id).uniqueResult();
	}
	
	public List<TCategory> findChildCategories(String id) {
		if(id.equals("cate_root")||id==null||id.equals(" ")){
		     return findCategoriesTop();
		}else{
			return HibernateSessionFactory.getSession().
			createQuery("from TCategory cate where cate.TCategory.cateId=:id").setString("id", id).list();
		}
	}
	public List<TCategory> findCategoriesTop() {
		System.out.println("查询顶级父目录.................");
		String hql = "select distinct cate,childs from TCategory cate left join fetch cate.TCategories childs where cate.TCategory.cateId is null";
		return HibernateSessionFactory.getSession().createQuery(hql).list();
	}
	public List<TCategory> findCategoriesAll() {
		System.out.println("查询顶级父目录.................");
		String hql = "from TCategory";
		return HibernateSessionFactory.getSession().createQuery(hql).list();
	}
	public List<Map<String,String>> findNameById(String id){
		List<Map<String,String>> names=new ArrayList<Map<String,String>>();
		
		UserService sf=new UserService();
		Set<TCategory> cates=sf.findById(id).getTCategories();
		for(TCategory cate:cates){
			Map<String,String> maps=new HashMap<String,String>();
			maps.put("CATALOGSID", cate.getCateId().toString());
			maps.put("CATALOGNAME", cate.getName());
			names.add(maps);
		}
		return names;
		
	}
	
	public Integer findLastId(){
		String hql="select max(cateId) from TCategory";
		return (Integer)HibernateSessionFactory.getSession().createQuery(hql).uniqueResult();
	}
}

这个示例只用了Hibernate，至于这个HibernateSessionFactory，它是利用MyEclipse反转数据库自动生成的，如果不知道可以参考我之前关于数据库反转的文章