一个经典的JAVA APPLET程式（二）-JSP教程,J2EE/EJB/服务器

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更多发布于：2011-01-08 20:55

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	接着上面的部分，下面是applet主程式部分： public class myclock extends applet implements runnable { static final int background=0; //背景图片的序号，供数组使用 static final int logo=1; //logo图片的序号，供数组使用 static final string javex="bear"; //表盘上显示的文字 static final double minsec=0.104719755; //分针和秒针在表盘上的刻度（60个）间的弧度 static final double hour=0.523598776; //时针在表盘上的刻度（24个）间的弧度 thread clockthread = null; //使用多线程机制，用另一个线程不断显示图片 //提供的默认参数，如果html文件里面没有给参数就使用 int width = 100; int height = 100; color bgcolor = new color(0,0,0); color facecolor = new color(0,0,0); color sweepcolor = new color(255,0,0); color minutecolor = new color (192,192,192); color hourcolor = new color (255,255,255); color textcolor = new color (255,255,255); color casecolor = new color (0,0,0); color trimcolor = new color (192,192,192); string logostring=null; image p_w_picpath[] = new image[2]; //背景和logo的图片 boolean ispainted=false; //如果第一次载入时绘制背景及表盘，其他时候重绘则只绘制指针 //时钟圆心的位置 int x1,y1; //最上面那个三角形的刻度图像的坐标 int xpoints[]=new int[3], ypoints[]=new int[3]; //保存当前时间，转换成(double)(hours + minutes/60) hms cur_time; //秒针、分针、时针 sweephand sweep; hmhand minutehand, hourhand; //用于绘制的时、分、秒 double lasthour; int lastminute,lastsecond; //显示日期和表盘上的字母的字体 font font; //图片显示使用了缓冲机制，offscrimage和offscrgc存放缓冲区内图片的信息 image offscrimage; graphics offscrgc; //用于测试背景图片和logo图片 mediatracker tracker; int mindimension; // 如果背景区域不是正方形的话，确保时钟在中间显示 int originx; // 时钟图像所在正方形区域的左上角x坐标 int originy; // 时钟图像所在正方形区域的左上角y坐标 double tzdifference=0; //时区间的差，向西为负数，向东为正数 boolean localonly=false; //是否只使用本地时间，如果为false则能根据传入的时区显示该时区时间 //保存参数的类型说明 public string[][] getparameterinfo() { string[][] info = { {"width", "int", "applet的长度，以象素为单位"}, {"height", "int", "applet的宽度，以象素为单位"}, {"bgcolor", "string", "背景颜色，e.g ff0000"}, {"facecolor", "string", "表盘颜色"}, {"sweepcolor", "string", "秒针颜色"}, {"minutecolor", "string", "分针颜色"}, {"hourcolor", "string", "时针颜色"}, {"textcolor", "string", "文本颜色"}, {"casecolor", "string", "框内颜色"}, {"trimcolor", "string", "空白区颜色"}, {"bgimageurl", "string", "背景图片地址"}, {"logostring", "string", "logo字符"}, {"logoimageurl","string", "logo图片地址"}, {"timezone", "real", "时区间的差"}, {"localonly", "int", "是否考虑到时区差别"} }; return info; } //显示信息 public string getappletinfo() { return "版权所有，copy必究，保护正版，人人有责"; } void showurlerror(exception e) { string errormsg = "url错误："+e; showstatus(errormsg); system.err.println(errormsg); } //相当于把时钟变成100×100的大小，percent即相对坐标 private int size(int percent) { return (int)((double)percent/100.0 * (double)mindimension); } public void init() { url p_w_picpathurl[] = new url[2]; string szp_w_picpathurl[] = new string[2]; tracker = new mediatracker(this); //得到html页面提供的参数，并把他转换相应的格式 string paramstring = getparameter( "width" ); if( paramstring != null ) width = integer.valueof(paramstring).intvalue(); paramstring = getparameter( "height" ); if( paramstring != null ) height = integer.valueof(paramstring).intvalue(); paramstring = getparameter( "timezone" ); if( paramstring != null ) tzdifference = double.valueof(paramstring).doublevalue(); paramstring = getparameter( "localonly" ); if( paramstring != null ;; integer.valueof(paramstring).intvalue() != 0){ localonly=true; tzdifference=0.; } paramstring = getparameter( "bgcolor"); if( paramstring != null ) bgcolor=parsecolorstring(paramstring); paramstring = getparameter( "facecolor"); if( paramstring != null ) facecolor=parsecolorstring(paramstring); paramstring = getparameter( "sweepcolor"); if( paramstring != null ) sweepcolor=parsecolorstring(paramstring); paramstring = getparameter( "minutecolor"); if( paramstring != null ) minutecolor=parsecolorstring(paramstring); paramstring = getparameter( "hourcolor"); if( paramstring != null ) hourcolor=parsecolorstring(paramstring); paramstring = getparameter( "textcolor"); if( paramstring != null ) textcolor=parsecolorstring(paramstring); paramstring = getparameter( "casecolor"); if( paramstring != null ) casecolor=parsecolorstring(paramstring); paramstring = getparameter( "trimcolor"); if( paramstring != null ) trimcolor=parsecolorstring(paramstring); logostring = getparameter( "logostring"); if( logostring == null ) logostring=javex; else if(logostring.length() > 8) logostring= logostring.substring(0,8); //限制8个字母，否则显示不下! //szp_w_picpathurl数组根据html传入参数存放图片的文件名 szp_w_picpathurl[background] = getparameter("bgimageurl"); szp_w_picpathurl[logo] = getparameter("logoimageurl"); //测试图片 for(int i=0; i<2; i++){ if(szp_w_picpathurl != null){ //根据codebase参数和image文件名得到image的路径，测试是否存在，如果不存在就不用图片 try{ p_w_picpathurl=new url(getcodebase(),szp_w_picpathurl); } catch (malformedurlexception e) { showurlerror(e); p_w_picpathurl=null; p_w_picpath=null; } if(p_w_picpathurl != null){ showstatus("加载图片: " + p_w_picpathurl.tostring()); p_w_picpath=getimage(p_w_picpathurl); if(p_w_picpath != null) tracker.addimage(p_w_picpath,i); showstatus(""); } try{ tracker.waitforall(i); }catch (interruptedexception e){} } else p_w_picpath=null; } //得到相应时区的时间 cur_time=(localonly)? new hms() : new hms(tzdifference); lasthour=-1.0; lastminute=-1; lastsecond=-1; x1=width/2; y1=height/2; //换算出圆形时钟在背景里的左上角坐标 mindimension= math.min(width, height); originx=(width-mindimension)/2; originy=(height-mindimension)/2; //计算出上面三角形的三个点的坐标 xpoints[1]=x1-size(3); xpoints[2]=x1+size(3); xpoints[0]=x1; ypoints[1]=y1-size(38);ypoints[2]=y1-size(38); ypoints[0]=y1-size(27); //计算出秒针、分针、时针图像的各个点坐标 sweep=new sweephand(x1,y1,size(40),3); minutehand=new hmhand(x1,y1,size(40),size(6),6); hourhand=new hmhand(x1,y1,size(25),size(8),6); //构造字体 font=new font("txt",font.bold,size(10)); //构造缓冲区内图像 offscrimage = createimage(width,height); offscrgc = offscrimage.getgraphics(); system.out.println(getappletinfo()); } public void start() //开始启动显示线程 { if(clockthread == null){ clockthread = new thread(this); } clockthread.start(); } public void stop() //停止显示 { clockthread = null; } private void drawhands(graphics g) { double angle; int i,j; int x,y; angle=minsec * lastsecond; //根据lastsecond算出秒针相对于12点刻度的角度 sweep.draw(facecolor, angle, g);//画出秒针 //如果时和分改动则重绘时针分针 if(cur_time.getminutes() != lastminute){ minutehand.draw(facecolor,minseclastminute,g); if(cur_time.get_hours() != lasthour) hourhand.draw(facecolor,hourlasthour,g); } g.setcolor(textcolor); g.fillrect(originx+size(12),y1-size(2),size(10),size(4)); //绘制左侧横条 g.fillrect(x1-size(2),originy + mindimension-size(22),size(4),size(10)); //绘制下面的横条 g.fillpolygon( xpoints, ypoints, 3); //绘制顶部的三角形 for(i=1;i<12;i+=3) //在表盘的2、3、5、6、8、9、11时针刻度区绘制圆 for(j=i;j<i+2;j++){ x=(int)(x1+math.sin(hourj)size(35)); y=(int)(y1-math.cos(hourj)size(35)); g.filloval(x-size(3),y-size(3),size(6),size(6)); } //设置字体 g.setfont(font); fontmetrics fm=g.getfontmetrics(); //画顶部的logo字符串 g.drawstring(logostring,x1-fm.stringwidth(logostring)/2,y1-size(12)); //得到日期 string day=integer.tostring(cur_time.getdate(),10); //将日期绘制在表盘右侧 g.drawstring( day, originx + mindimension-size(14)-fm.stringwidth(day), y1+size(5)); //外面画上框子 g.drawrect( originx + mindimension-size(14)-fm.stringwidth(day)-size(2), y1-size(5)-size(2), fm.stringwidth(day)+size(4), size(10)+size(4)); if(p_w_picpath[logo] != null){ //如果logo图片存在，在底部画出来 x = originx + (mindimension-p_w_picpath[logo].getwidth(this))/2; y = y1 + (mindimension/2 - size(22) - p_w_picpath[logo].getheight(this))/2; if(x > 0 ;; y > 0) offscrgc.drawimage(p_w_picpath[logo], x, y, this); } lasthour=cur_time.get_hours(); hourhand.draw(hourcolor,hourlasthour,g); //画时针 lastminute=cur_time.getminutes(); minutehand.draw(minutecolor,minseclastminute,g); //画分针 g.setcolor(minutecolor); //绘制分针尾部的圆形 g.filloval(x1-size(4),y1-size(4),size(8),size(8)); g.setcolor(sweepcolor); //绘制秒针尾部的圆形 g.filloval(x1-size(3),y1-size(3),size(6),size(6)); lastsecond=cur_time.getseconds(); //得到新的秒数，重画 angle=minseclastsecond; sweep.draw(sweepcolor, angle,g); g.setcolor(trimcolor); g.filloval(x1-size(1),y1-size(1),size(2),size(2)); //秒针尾部圆心部分应该是螺丝，挖空处理^_^ } private color parsecolorstring(string colorstring) //参数传入为字符串形（规定为16进制6位字符串） { if(colorstring.length()==6){ int r = integer.valueof(colorstring.substring(0,2),16).intvalue(); //前两位为r值 int g = integer.valueof(colorstring.substring(2,4),16).intvalue(); //中间为g值 int b = integer.valueof(colorstring.substring(4,6),16).intvalue(); //最后为b值 return new color(r,g,b); //得到color } else return color.lightgray; //字符串不符合规范，默认为灰色 } public void run() { repaint(); //每次启动时首先重绘一次 //每隔500ms获得目前时间并重绘一次 while(null != clockthread){ cur_time= (localonly)? new hms() :new hms(tzdifference); repaint(); try{ thread.sleep(500); } catch (interruptedexception e) {} } } public void paint(graphics g) //首先绘制缓冲区内图片，再显示出来 { int i,x0,y0,x2,y2; //如果没有提供背景图片，则用bgcolor绘制背景 if(p_w_picpath[background] == null){ offscrgc.setcolor(bgcolor); offscrgc.fillrect(0,0,width,height); } else //否则直接使用背景图片 offscrgc.drawimage(p_w_picpath[background], 0, 0, this); //绘制外框到表盘间的部分 offscrgc.setcolor(casecolor); //将园形的范围适量缩减（不充满整个区域），防止有些地方被截取 offscrgc.filloval( originx+1, originy+1, mindimension-2, mindimension-2); //绘制表盘 offscrgc.setcolor(facecolor); offscrgc.filloval( originx + size(5), originy + size(5), mindimension - size(10), mindimension - size(10)); //绘制外框线 offscrgc.setcolor(trimcolor); offscrgc.drawoval( originx+1, originy+1, mindimension-2, mindimension-2); //绘制内框线 offscrgc.drawoval( originx + size(5), originy + size(5), mindimension - size(10), mindimension - size(10)); offscrgc.setcolor(textcolor); //画刻度，一共有60个刻度，x0、y0为刻度起始的位置，x1、y1圆心位置，x2、y2为刻度终止位置（x0<x2，y0<y2） for(i=0;i<60;i++){ if(i==0 \|\| (i>=5 ;; i%5 == 0)){ //每5格绘制一条长线（相对圆心） x0=(int)(x1+size(40)math.sin(minseci)); y0=(int)(y1+size(40)math.cos(minseci)); } else{ //其他部分绘制短线 x0=(int)(x1+size(42)math.sin(minseci)); y0=(int)(y1+size(42)math.cos(minseci)); } x2=(int)(x1+size(44)math.sin(minseci)); y2=(int)(y1+size(44)math.cos(minsec*i)); offscrgc.drawline(x0,y0,x2,y2); } drawhands(offscrgc); //绘制指针 g.drawimage(offscrimage,0,0,this); //把生成的缓冲区图像绘制到页面上 ispainted=true; //使下次update时不绘制表盘 } public synchronized void update(graphics g) { if(!ispainted) //绘制表盘 paint(g); else{ //已绘制了表盘，只用绘制指针，首先在缓冲区内绘制，然后显示出来 drawhands(offscrgc); g.drawimage(offscrimage,0,0,this); } } } 一个测试用的html的例子： <html> <title>我的时钟程式</title> <body> <h2>显示东8区的时间</h2> <p> <applet code="myclock.class" width="300" height="300"> <param name="bgcolor" value="ffffff"> <param name="facecolor" value="ffffff"> <param name="sweepcolor" value="ff0000"> <param name="minutecolor" value="008080"> <param name="hourcolor" value="000080"> <param name="textcolor" value="000000"> <param name="casecolor" value="000080"> <param name="trimcolor" value="c0c0c0"> <param name="logoimageurl" value="java.gif"> <param name="timezone" value="8"> </p> </body> </html> 更多黑客技术黑客软件计算机技术编程技术网站技术 qq技术 IT新闻黑客基地请访问灯火安全联盟灯火黑客 www.hack8888.com/bbs