flex实现手写在线签名
2009-08-03 17:58
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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:
Actionscript代码
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
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×tamp="+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+"×tamp="+new Date().getTime();
var req:URLRequest=new URLRequest(url2);
file=new FileReference();
file.download(req,"humanmonth.jpg");
}
}
}
Actionscript代码
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/
10:10
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分类: 人月软件
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3 楼
presses
2009-06-14
引用
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
/**
*
*/
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
/**
*
*/
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
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;
}
}
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:
Actionscript代码
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
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×tamp="+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+"×tamp="+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×tamp="+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+"×tamp="+new Date().getTime(); var req:URLRequest=new URLRequest(url2); file=new FileReference(); file.download(req,"humanmonth.jpg"); } } }
Actionscript代码
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/
10:10
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分类: 人月软件
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3 楼
presses
2009-06-14
引用
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
/**
*
*/
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
/**
*
*/
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
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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