flex实现手写在线签名

    企业信息系统中，有时候需要用到手写签名的功能。在这里用flex实现一个。功能实现了，效果还在改善中。
     在线手写签名分两部份。第一部分是画图功能的实现，第二部份是上传图片的功能（上传到服务器或保存到本地）。
     画图：画图比较简单，只要用到了graphics对像的几个方法。当鼠标按下时，调用graphics的beginFill和moveTo方法。同时，还要把调用了lineTo的方法加入到鼠标的MOUSE_MOVE事件中。代码如下：

package com.humanmonth.home.component.page.signature
{
	import flash.display.CapsStyle;
	import flash.display.JointStyle;
	import flash.display.LineScaleMode;
	import flash.events.MouseEvent;
	
	import mx.containers.Canvas;
	import mx.core.UIComponent;
	
	/**
	 * 实现手写签名的白板
	 * @author presses
	 * 
	 */
	public class WriteArea extends Canvas
	{
		/**
		 *笔 
		 */
		public var signature:UIComponent=new UIComponent();
		/**
		 *颜色 
		 */
		public var myColor:uint=0x000000;
		/**
		 *线条粗细 
		 */
		public var lineSize:int=1;
		/**
		 *模式 
		 */
		public var pattern:String="圆珠笔";
		/**
		 *当前的x座标 
		 */
		private var cX:Number;
		/**
		 *当前的y座标 
		 */
		private var cY:Number;
		
		public function WriteArea()
		{
			this.addChild(signature);
			this.addEventListener(MouseEvent.MOUSE_DOWN,beginDraw);
			this.addEventListener(MouseEvent.MOUSE_UP,endDraw);
		}
		
		/**
		 *鼠标压下时，开始画图，并添加移动鼠标画线的监听器 
		 */
		private function beginDraw(event:MouseEvent):void{
			this.signature.graphics.lineStyle(lineSize,myColor,1,true,LineScaleMode.NONE,CapsStyle.ROUND,JointStyle.ROUND,99);
			this.signature.graphics.beginFill(myColor);
			this.cX=event.localX;
			this.cY=event.localY;
			this.signature.graphics.moveTo(this.cX,this.cY);
			this.addEventListener(MouseEvent.MOUSE_MOVE,drawIng);
		}
		
		/**
		 * 鼠标移动时，画线 
		 */
		private function drawIng(event:MouseEvent):void{
			if(this.pattern=="圆珠笔"){
				this.signature.graphics.moveTo(this.cX,this.cY);
			}
			this.signature.graphics.lineTo(event.localX,event.localY);
			this.cX=event.localX;
			this.cY=event.localY;
		}
		
		/**
		 * 结束画图 
		 */
		private function endDraw(event:MouseEvent):void{
			this.removeEventListener(MouseEvent.MOUSE_MOVE,drawIng);
		}
		
	}
}

            上传签名图片（上传到服务器或保存到本地）:fp10(flash player)可以不经服务器，直接把图片保存到本地。但为了兼容fp9,这里的实现是先把图片上传到服务器，再调用下载功能。实现的思路是先把画图的组件转化为BitmapData,然后再编码成jpeg格式，并上传到服务器。最后调用客户端下载。这里要注意的一点是，fp10对下载的api作了限制，下载动作只能由用户触发。代码如下：

package com.humanmonth.home.component.page.signature.remote
{
	import com.humanmonth.global.Config;
	
	import flash.display.BitmapData;
	import flash.events.Event;
	import flash.net.FileReference;
	import flash.net.URLLoader;
	import flash.net.URLRequest;
	import flash.net.URLRequestMethod;
	
	import mx.controls.Alert;
	import mx.graphics.codec.JPEGEncoder;
	import mx.managers.CursorManager;
	
	/**
	 * 图片的上传及下载
	 * @author presses
	 * 
	 */
	public class Connector
	{
		private var file:FileReference;
		private var myId:String;
		public function Connector()
		{
		}
		
		/**
		 * 保存图片
		 */
		public function savePic(myData:BitmapData,fun:Function):void{
		    CursorManager.setBusyCursor();
			var url:String=Config.picLink+"rea/pic.do?action=savePic&timestamp="+new Date().getTime();
 			var request:URLRequest = new URLRequest(url); 			
 			request.method=URLRequestMethod.POST;
		 	request.contentType = "application/octet-stream"; 
 			request.data=new JPEGEncoder(80).encode(myData);
            var loader:URLLoader = new URLLoader();                  
            loader.load(request) ;        
            loader.addEventListener(Event.COMPLETE, fun) ; 	
            loader.addEventListener(Event.COMPLETE,initMyId);
            Alert.show("正在上传图片，等待数秒后，即可下载图片");		
		}
		
		private function initMyId(event:Event):void{
		    CursorManager.removeBusyCursor();
			var loader:URLLoader=URLLoader(event.target);
			this.myId=loader.data;
			Alert.show("上传图片成功，现在可以点击‘下载图片’按钮，保存图片到本地。");
			
		}
		
		/**
		 * 下载图片 
		 */
		public function downloadFile(event:Event):void{
			var url2:String=Config.picLink+"rea/pic.do?action=queryPicById&pid="+myId+"&timestamp="+new Date().getTime();
			var req:URLRequest=new URLRequest(url2);
			file=new FileReference();
			file.download(req,"humanmonth.jpg");
		}
	}
}

package com.humanmonth.home.component.page.signature
{
	import com.humanmonth.home.component.page.signature.remote.Connector;
	
	import flash.display.BitmapData;
	import flash.events.Event;
	import flash.events.MouseEvent;
	
	import mx.core.Application;
	import mx.events.ColorPickerEvent;
	import mx.events.FlexEvent;
	import mx.events.ListEvent;
	import mx.events.NumericStepperEvent;
	
	/**
	 * 控制面版
	 * @author presses
	 * 
	 */
	public class MyControlBarAs extends MyControlBar
	{
		public var writearea:WriteArea;
		private var connector:Connector=new Connector();
		public function MyControlBarAs()
		{
			super();
			this.addEventListener(FlexEvent.CREATION_COMPLETE,myInit);
		}
		
		private function myInit(event:Event):void{
			this.writearea=Application.application.signature.writearea;
			this.reset.addEventListener(MouseEvent.CLICK,cleanArea);
			this.size.addEventListener(NumericStepperEvent.CHANGE,setLineSize);
			this.color.addEventListener(ColorPickerEvent.CHANGE,setColor);
			this.pattern.addEventListener(ListEvent.CHANGE,setPattern);
			this.savePic.addEventListener(MouseEvent.CLICK,savePicture);
			this.downloadPic.addEventListener(MouseEvent.CLICK,connector.downloadFile)
		}
		/**
		 * 保存图片 
		 */
		private function savePicture(event:Event):void{
			var myData:BitmapData=new BitmapData(this.writearea.width,this.writearea.height);
			myData.draw(this.writearea);
			connector.savePic(myData,enableDownload); 
		}
		
		private function enableDownload(event:Event):void{
			this.downloadPic.enabled=true;
		}
		/**
		 * 设置模式 
		 */
		private function setPattern(event:Event):void{
			this.writearea.pattern=String(this.pattern.value);
		}
		/**
		 * 清空写字区 
		 */
		private function cleanArea(event:Event):void{
			this.writearea.signature.graphics.clear();
		}
		
		/**
		 * 设置线条粗细 
		 */
		public function setLineSize(event:Event):void{
			this.writearea.lineSize=this.size.value;
		}
		
		/**
		 * 设置颜色
		 */
		public function setColor(event:Event):void{
			this.writearea.myColor=uint(this.color.value);
		}
		
		
	}
}

          到这里为止，功能已经实现了。但效果不太好。主要是签名时，笔画不圆滑，在flex的api中，好像找不到在flash中设置圆滑的功能。

           效果图：http://piterlin.appspot.com/

评论

13 楼 zlsj80 2009-12-09  

楼主，你这个有人在你的基础上改进了
http://bbs.airia.cn/FLEX/thread-8769-1-1.aspx

12 楼 starone 2009-11-04  

期待LZ打包

11 楼 presses 2009-09-25  

<p><br><img src="http://dl.iteye.com/upload/attachment/150472/b38afe29-2b3c-365a-8066-5e9fe8777034.jpg" alt=""></p>
<p> </p>
<p><span style="white-space: pre;"> </span>我上面就说了，效果不怎么样。呵呵。</p>

10 楼 wei495715356 2009-09-24  

毛笔的 毛字好像不能写呢

9 楼 presses 2009-08-26  

<pre name="code" class="MXML">&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;mx:Panel xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="100%" height="200" title="控制栏"&gt;
&lt;mx:Label x="10" y="11" text="模式" width="56" textAlign="right"/&gt;
&lt;mx:ComboBox x="85" y="6" fontSize="12" fontWeight="normal" id="pattern"&gt;
&lt;mx:dataProvider&gt;
&lt;mx:Array&gt;
&lt;mx:String&gt;圆珠笔&lt;/mx:String&gt;
&lt;mx:String&gt;毛笔&lt;/mx:String&gt;
&lt;/mx:Array&gt;
&lt;/mx:dataProvider&gt;
&lt;/mx:ComboBox&gt;
&lt;mx:HRule x="13" y="37" width="192" height="4"/&gt;
&lt;mx:Label x="0" y="48" text="笔画粗细" width="66" textAlign="right"/&gt;
&lt;mx:NumericStepper x="85" y="46" minimum="1" maximum="5" stepSize="1" id="size"/&gt;
&lt;mx:HRule x="13" y="74" width="192" height="8"/&gt;
&lt;mx:Label x="10" y="89" text="颜色" width="56" textAlign="right"/&gt;
&lt;mx:ColorPicker x="85" y="89" id="color"/&gt;
&lt;mx:HRule x="13" y="115" width="192" height="6"/&gt;
&lt;mx:Button x="10" y="129" label="清空" id="reset"/&gt;
&lt;mx:Button x="58" y="129" label="上传图片" id="savePic"/&gt;
&lt;mx:Button x="124" y="129" label="下载图片" id="downloadPic" enabled="false"/&gt;
&lt;/mx:Panel&gt;
</pre>
<p> 全部类都帖上来了，以后有时间再打包上传。</p>

8 楼 key232323 2009-08-25  

lz

那个 MyControlBar的代码，也分享下吧

干脆整个工程给个，我刚懂点as，flex都搞不定呵
麻烦一下

7 楼 p_x1984 2009-07-10  

路过,过来瞧瞧!

6 楼 zylucky 2009-07-10  

能发一个份给我吗。。谢谢  [e-mail]

5 楼 lydawen 2009-06-28  

如果换成光笔就强大了~

4 楼 wuxi15932077655 2009-06-27  

牛X 我就想说牛X 为什么不让说两个字！

3 楼 presses 2009-06-14  

java端主要有两个方法。一个是接收客户端保存图片时的流，另一个是根据客户端的ID返回流。当前例子是运行在google app engine上的。以下是核心代码：
servlet:

/**
 * 
 */
package com.humanmonth.rea.pic;

import java.io.IOException;
import java.util.logging.Logger;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.IOUtils;

import com.google.appengine.api.datastore.Blob;
import com.humanmonth.framework.web.servlet.Action;
import com.humanmonth.framework.web.servlet.AutoMapperServlet;
import com.humanmonth.framework.web.servlet.ServletUtil;

/**
 * @author presses
 * 
 */
@SuppressWarnings("serial")
public class PictureServlet extends AutoMapperServlet {
private Logger log=Logger.getLogger(this.getClass().getName());
	/**
	 * 测试
	 */
	@Action("sayHi")
	public void sayHi(HttpServletRequest req, HttpServletResponse res) throws IOException {
		ServletUtil.outTips(res, "hi", null);
	}

	/**
	 * 保存图片
	 */
	@Action("savePic")
	public void savePic(HttpServletRequest req, HttpServletResponse res) throws IOException {
String name= ServletUtil
.getStringParameterWithTrim(req, "name");
if(name==null){
	name="签名.jpg";
}
		Picture pic = new Picture(ServletUtil.getStringParameterWithTrim(req, "module"),name, new Blob(IOUtils.toByteArray(req.getInputStream())));
		new PictureService().savePic(pic);
		log.info("保存的文件大小："+pic.getContent().getBytes().length);
		ServletUtil.outView(res, pic.getId());
	}

	/**
	 * 查找所有图片
	 */
	@Action("queryAllPic")
	public void queryAllPic(HttpServletRequest req, HttpServletResponse res) throws IOException {
		String result = "";
		for (Picture pic : new PictureService().queryAllPicture()) {
			if (pic.getContent() == null) {
				continue;
			}
			result += new String(pic.getContent().getBytes(), "utf-8") + ":";
		}
		ServletUtil.outView(res, result);
	}

	/**
	 * 以ID获取图片
	 */
	@Action("queryPicById")
	public void queryPicById(HttpServletRequest req, HttpServletResponse res) throws IOException {
		String id = ServletUtil.getStringParameterWithTrim(req, "pid");
		log.info("开始下载文件,ID为:"+id);
		Picture pic = new PictureService().queryPicById(Long.valueOf(id));
		log.info("下载的文件大小："+pic.getContent().getBytes().length);
		ServletUtil.downloadToClient(res, pic.getContent().getBytes(), pic.getName());
	}
}

业务类：

/**
 * 
 */
package com.humanmonth.rea.pic;

import java.util.List;
import java.util.logging.Logger;

import javax.jdo.PersistenceManager;

import com.humanmonth.framework.dao.JDOTemplate;

/**
 * @author presses
 * 
 */
public class PictureService {
	@SuppressWarnings("unused")
	private final Logger log=Logger.getLogger(this.getClass().getName());
	/**
	 * 保存图片
	 */
	public void savePic(final Picture pic) {
		new JDOTemplate<Picture>() {
			@Override
			public void deal(PersistenceManager pm, List<Picture> result) {
				pm.makePersistent(pic);
				pm.flush();
			}
		}.execute();
	}

	/**
	 * 以ID和条件获取图片
	 */
	public Picture queryPicById(final Long id) {
		return new JDOTemplate<Picture>() {
			@Override
			public void deal(PersistenceManager pm, List<Picture> result) {
				result.add((Picture) pm.getObjectById(Picture.class,id));
			}
		}.execute().get(0);
	}

	/**
	 * 查找所有的图片
	 */
	public List<Picture> queryAllPicture() {
		return new JDOTemplate<Picture>() {
			@SuppressWarnings("unchecked")
			@Override
			public void deal(PersistenceManager pm, List<Picture> result) {
				Object obj = pm.newQuery("select from " + Picture.class.getName()).execute();
				result.addAll((List<Picture>) obj);
			}
		}.execute();
	}
}

域对像：

package com.humanmonth.rea.pic;

import java.sql.Date;

import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;

import com.google.appengine.api.datastore.Blob;

/**
 * 图片
 * 
 * @author presses
 * 
 */
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Picture {
	/**
	 * 主键
	 */
	@PrimaryKey
	@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
	private Long id;
	/**
	 * 模块
	 */
	@Persistent
	private String module;
	/**
	 * 文件名
	 */
	@Persistent
	private String name;
	/**
	 * 内容
	 */
	@Persistent
	private Blob content;
	/**
	 * 保存时间
	 */
	@Persistent
	private Date date;

	public Picture(String module, String name,Blob content) {
		this.module = module;
		this.name=name;
		this.content = content;

	}

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getModule() {
		return module;
	}

	public void setModule(String module) {
		this.module = module;
	}

	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}

	public Blob getContent() {
		return content;
	}

	public void setContent(Blob content) {
		this.content = content;
	}

	public String getName() {
		return name;
	}

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

2 楼 pupyyang 2009-06-12  

我也想运行以下楼主的成果，能不能把java包给一给呢~~

1 楼 xhanxhanxhan 2009-05-03  

谢谢分享  原来10还能下载的