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flex 手写在线签名 flex 手写在线签名实现代码

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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：
Actionscript代码
复制代码 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);
}
}
}
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：
Actionscript代码
复制代码 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.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");
        }
    }
}

Actionscript代码
复制代码 代码如下:

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);
}
}
}
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://rea.humanmonth.com/

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:
Java代码
复制代码 代码如下:

/**
*
*/
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());
}
}
/**
*
*/
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：
Java代码
复制代码 代码如下:

/**
*
*/
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();
}
}
/**
*
*/
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：
Java代码
复制代码 代码如下:

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;
}
}

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