116.網(wǎng) 絡(luò) 程 序 設(shè) 計報告

1、設(shè)計報告課程名稱： 網(wǎng) 絡(luò) 程 序 設(shè) 計 學 院：電子科學與信息技術(shù) 專 業(yè)： 信 息 安 全 姓 名： 學 號： 年 級： 2005級 任課教師： 2008年 6月 29日tcpfiletransferdemo設(shè)計一、 設(shè)計目標：基于tcp的文件傳輸二、 技術(shù)原理簡介：應(yīng)用層網(wǎng)絡(luò)協(xié)議設(shè)計掌握tcp服務(wù)端和客戶端程序的編寫方法三、 需求分析：使用tcp監(jiān)聽的服務(wù)端網(wǎng)絡(luò)程序模型協(xié)議的解析處理文件列表獲取、傳輸和顯示功能的實現(xiàn)文件內(nèi)容獲取、傳輸和顯示功能的實現(xiàn) 四、 設(shè)計思路： 1、設(shè)計一個發(fā)送方windows窗體，上邊放目標ip、域名按鈕、一個端瀏覽鈕，開始，取消按鈕。2、一個tcp文件傳輸窗

2、體，啟動發(fā)送方按鈕，啟動接收方按鈕。3、接收方窗體，監(jiān)聽端口，開始按鈕，停止按鈕。五、設(shè)計框圖： 進行傳輸建立傳輸斷六、關(guān)鍵部分窗體：七、：關(guān)鍵代碼及其注釋：主窗體：private void initializecomponent() this.btnstartsender = new system.windows.forms.button(); this.startreceiver = new system.windows.forms.button(); this.dlgfindfile = new system.windows.forms.openfiledialog(); this.su

3、spendlayout(); / / startsender / this.btnstartsender.location = new system.drawing.point(16, 16); this.btnstartsender.name = "btnstartsender" this.btnstartsender.size = new system.drawing.size(176, 32); this.btnstartsender.tabindex = 0; this.btnstartsender.text = "啟動發(fā)送方" this.btn

4、startsender.click += new system.eventhandler(this.btnstartsender_click); / / startreceiver / this.startreceiver.location = new system.drawing.point(16, 56); this.startreceiver.name = "startreceiver" this.startreceiver.size = new system.drawing.size(176, 32); this.startreceiver.tabindex = 1

5、; this.startreceiver.text = "啟動接收方" this.startreceiver.click += new system.eventhandler(this.startreceiver_click); / / controller / this.autoscalebasesize = new system.drawing.size(6, 14); this.clientsize = new system.drawing.size(208, 104); this.controls.add(this.startreceiver); this.cont

6、rols.add(this.btnstartsender); this.formborderstyle = system.windows.forms.formborderstyle.fixedsingle; this.maximizebox = false; this.minimizebox = false; this.name = "controller" this.startposition = system.windows.forms.formstartposition.centerscreen; this.text = "tcp 文件傳輸" th

7、is.load += new system.eventhandler(this.controller_load); this.resumelayout(false);接收方：namespace receiverpublic class receiver : system.windows.forms.formprivate system.windows.forms.textbox txtport;private system.windows.forms.label label2;private system.windows.forms.button btnstart;private system

8、.windows.forms.label lblstatus;private system.windows.forms.label label4;private system.windows.forms.label label1;private system.windows.forms.button btnstop;private system.windows.forms.savefiledialog dlgsavefile;/ <summary>/ 必需的設(shè)計器變量。/ </summary>private system.componentmodel.container

9、 components = null;public receiver()initializecomponent();setstatusdelegate = new setstatusdelegate(setstatus);getsavefiledelegate = new getsavefiledelegate(getsavefile);/ 清理所有正在使用的資源。/ </summary>protected override void dispose( bool disposing )if( disposing )if (components != null) components

10、.dispose();base.dispose( disposing );#region windows 窗體設(shè)計器生成的代碼/ <summary>/ 設(shè)計器支持所需的方法- 不要使用代碼編輯器修改/ 此方法的內(nèi)容。/ </summary>private void initializecomponent() this.txtport = new system.windows.forms.textbox(); this.label2 = new system.windows.forms.label(); this.btnstart = new system.windows

11、.forms.button(); this.lblstatus = new system.windows.forms.label(); this.label4 = new system.windows.forms.label(); this.label1 = new system.windows.forms.label(); this.btnstop = new system.windows.forms.button(); this.dlgsavefile = new system.windows.forms.savefiledialog(); this.suspendlayout(); /

12、/ txtport / this.txtport.location = new system.drawing.point(80, 16); this.txtport.name = "txtport" this.txtport.size = new system.drawing.size(48, 21); this.txtport.tabindex = 1; this.txtport.text = "8080" / / label2 / this.label2.location = new system.drawing.point(16, 16); thi

13、s.label2.name = "label2" this.label2.size = new system.drawing.size(64, 24); this.label2.tabindex = 0; this.label2.text = "偵聽端口:" this.label2.textalign = system.drawing.contentalignment.middleleft; / / btnstart / this.btnstart.location = new system.drawing.point(128, 16); this.bt

14、nstart.name = "btnstart" this.btnstart.size = new system.drawing.size(48, 21); this.btnstart.tabindex = 2; this.btnstart.text = "開始" this.btnstart.click += new system.eventhandler(this.btnstart_click); / / lblstatus / this.lblstatus.location = new system.drawing.point(48, 48); th

15、is.lblstatus.name = "lblstatus" this.lblstatus.size = new system.drawing.size(264, 32); this.lblstatus.tabindex = 5; this.lblstatus.text = "就緒" this.lblstatus.click += new system.eventhandler(this.lblstatus_click); / / label4 / this.label4.location = new system.drawing.point(16,

16、48); this.label4.name = "label4" this.label4.size = new system.drawing.size(40, 16); this.label4.tabindex = 4; this.label4.text = "狀態(tài):" / / label1 / this.label1.location = new system.drawing.point(16, 88); this.label1.name = "label1" this.label1.size = new system.drawin

17、g.size(296, 32); this.label1.tabindex = 6; this.label1.text = "注意：彈出接收文件另存為對話框后請盡快確定保存位置，以免連接因等待太久而超時。" / / btnstop / this.btnstop.enabled = false; this.btnstop.location = new system.drawing.point(176, 16); this.btnstop.name = "btnstop" this.btnstop.size = new system.drawing.size

18、(48, 21); this.btnstop.tabindex = 3; this.btnstop.text = "停止" this.btnstop.click += new system.eventhandler(this.btnstop_click); / / dlgsavefile / this.dlgsavefile.filter = "所有文件|*.*" this.dlgsavefile.title = "接收文件另存為" / / receiver / this.autoscalebasesize = new system.

19、drawing.size(6, 14); this.clientsize = new system.drawing.size(320, 133); this.controls.add(this.label1); this.controls.add(this.lblstatus); this.controls.add(this.label4); this.controls.add(this.btnstart); this.controls.add(this.txtport); this.controls.add(this.label2); this.controls.add(this.btnst

20、op); this.formborderstyle = system.windows.forms.formborderstyle.fixedsingle; this.maximizebox = false; this.minimizebox = false; this.name = "receiver" this.text = "接收方" this.load += new system.eventhandler(this.receiver_load); this.resumelayout(false); this.performlayout();#end

21、region#region 程序邏輯private thread worker;private int port;private void start()try / 捕獲線程中止異常setstatus("開始偵聽端口");tcplistener tcplistener = new tcplistener(ipaddress.any, port);try / 捕獲開始偵聽時出現(xiàn)的錯誤，例如端口已被占用tcplistener.start();catch (exception e)setstatus("偵聽端口出錯：" + e.message);invokec

22、ancel();return;try / 確保停止偵聽setstatus("等待傳入連接中");while (true) / 一直循環(huán)，直到線程被中止。但每次只處理一個連接/ 沒有等待傳入的連接就一直等待。不使用異步模型以提高程序可讀性while (!tcplistener.pending()thread.sleep(100);tcpclient tcpclient = tcplistener.accepttcpclient();tcpclient.nodelay = true;tcpclient.receivetimeout = 30000;binaryreader re

23、ader = new binaryreader(tcpclient.getstream();try / 捕獲文件傳輸中途出現(xiàn)的錯誤，并確保關(guān)閉連接string filename = reader.readstring();long total = reader.readint64();setstatus("收到文件傳輸請求，文件名" + filename +"，大小" + total.tostring() + " 字節(jié)");string saveas = getsavefile(filename);if (saveas = null)

24、setstatus("操作已取消。等待下一連接中");/ finally 段會幫忙關(guān)閉連接elsesetstatus("接收文件中");filestream fs = file.create(saveas);trybyte buffer = new byte8192;int len;while (total > 0)len = reader.read(buffer, 0, 8192);if (len = 0)throw new ioexception("發(fā)送方中止了連接");fs.write(buffer, 0, len);se

25、tstatus("接收文件中- 剩余" +(total -= len).tostring() + " 字節(jié)");setstatus("文件已保存至" + saveas +"。等待下一連接中");finallyfs.close();catch (exception e)setstatus("文件傳輸中途出錯：" + e.message);invokecancel();finallytry reader.close(); catch try tcpclient.close(); catch fina

26、llytcplistener.stop();catch (threadabortexception)setstatus("用戶中斷");invokecancel();finallyworker = null;#endregion/ <summary>/ 應(yīng)用程序的主入口點。/ </summary>stathreadstatic void main() application.run(new receiver();private void btnstart_click(object sender, system.eventargs e)port = 0

27、;tryport = int.parse(txtport.text);if (port < 1 | port > 65535) throw new argumentoutofrangeexception();catchmessagebox.show("請輸入有效的端口號。");txtport.focus();txtport.selectall();return;btnstart.enabled = false;btnstop.enabled = true;worker = new thread(new threadstart(start);worker.isbackground = true;worker.start();private void btnstop_click(object sender, system.eventargs e)try worker.abort(); catch protected override void onclosing(canceleventargs e)if (btnstop.enabled)e.cancel = true;base.onclosing(e);#endregion#region 線程安全ui操作代碼private delegate voi