【正文】 符 4 表示這條消息是注冊(cè)消息。 3. 密碼找回功能 點(diǎn)擊密碼找回，彈出密碼找回窗口，輸入賬號(hào)以及密碼找回問 題的答案，將信息用標(biāo)識(shí)符組合發(fā)給服務(wù)器，然后接受服務(wù)器的返回信息，返回標(biāo)識(shí)符為 ok 則填出窗口顯示用戶名以及密碼，失敗則提示輸入信息不正確。 5. 客戶端接受信息線程 當(dāng)客戶端登錄后，創(chuàng)建一個(gè)專門負(fù)責(zé)處理服務(wù)器發(fā)來消息的線程，循環(huán)接受消息。 (str+\n\n)。\\這里的作用是滾屏 displayarea是文本區(qū)域；第三種分隔符是表示這是一對(duì)一單聊的消息，將消息根據(jù)分隔符截取，得到消息的發(fā)送人，查找是否已經(jīng)有與該用戶私聊的對(duì)話框，沒有則彈出與該用戶私聊的對(duì)話框，并顯示本條消息。 6. 與在線用戶私聊 雙擊在線用戶列表中的用戶名，彈出與該用戶私聊的對(duì)話窗口，在此次上線過程中這個(gè)對(duì)話窗口都將負(fù)責(zé)與該用戶的私聊，即使關(guān)閉了，該對(duì)話框也只是隱藏起來。 File a1=new File(fname+.txt)。 } 將顯示區(qū)域的消息存以追加的方式寫入到客戶端目錄下的以登錄用戶名命名的文件，然后清空消息顯示區(qū)域的文字。 組員的加密實(shí)現(xiàn) 同組的另一位同學(xué)將在我完成的模塊基礎(chǔ)上加入安全加密，大概功能有： 當(dāng)用戶注冊(cè)時(shí)自動(dòng)生成用戶的 RSA公私密鑰，保存在用戶端，將公鑰發(fā)給服務(wù)器；每當(dāng)用戶發(fā)信息時(shí)想用 des加密消息，再用私鑰加密對(duì)稱密鑰。 基于 java 的網(wǎng)絡(luò)安全聊天工具：網(wǎng)絡(luò)功能部分 20 功能模塊的測(cè)試 本次畢設(shè)的編譯環(huán)境，及編寫平臺(tái)為 java。 （圖 服務(wù)器主界面 ） 圖 ，下方各個(gè)用戶信息顯示區(qū)域，右側(cè)有一個(gè)在線用戶列表（當(dāng)有用戶登錄退出時(shí)都會(huì)更新，同時(shí)發(fā)送更新消息給所有客戶端）。 File菜單里面可以選擇賬號(hào)數(shù)據(jù)管理。 基于 java 的網(wǎng)絡(luò)安全聊天工具：網(wǎng)絡(luò)功能部分 21 服務(wù)器線程在程序運(yùn)行期間一直有效，接受客戶端請(qǐng)求信息，轉(zhuǎn)發(fā)客戶端聊天內(nèi)容，查看用戶信息。 （圖 客戶端注冊(cè)界面 ） 圖 ，這里要填寫用戶的基本資料，當(dāng)你用戶名為空或者包含畢設(shè)字樣時(shí)會(huì)有對(duì)話框提示。如下： 基于 java 的網(wǎng)絡(luò)安全聊天工具：網(wǎng)絡(luò)功能部分 22 （圖 注冊(cè)時(shí)的各種提示 ） （圖 密碼找回界面 ） 圖 為密碼找回的界面，需要輸入注冊(cè)時(shí)填寫的密碼找回答案，正確的話會(huì)彈出如圖 的對(duì)話框。雙擊用戶名會(huì)彈出一對(duì)一窗口如下圖 . （圖 客戶端用戶間私聊界面 ） 上圖中窗口 sissi 是用 戶 kangxi 雙擊 sissi 用戶后彈出的界面，輸入消息后，在用戶 sissi的電腦上就會(huì)彈出窗口 kangxi 顯示剛剛 kangxi發(fā)給 sissi 的消息。 基于 java 的網(wǎng)絡(luò)安全聊天工具：網(wǎng)絡(luò)功能部分 25 本聊天工具的所有一對(duì)一消息都是經(jīng)過加密的如下圖 （圖 服務(wù)器可見消息圖 ） 服務(wù)器只能看到群聊的明文，私聊只能看到加密過后的消息。但幾乎每一個(gè)計(jì)算機(jī)程序都會(huì)有這樣那樣的不足，尤其是未經(jīng)過精心維護(hù)的非商業(yè)軟件。 目前本聊天系統(tǒng)還有待完善的功能：聊天系統(tǒng)缺乏好友列表；沒有實(shí)現(xiàn)文件發(fā)送功能；沒有辦法發(fā)送圖片等。 經(jīng)驗(yàn)與感想 基本 JAVA 的網(wǎng)絡(luò)安全聊天工具的開發(fā)與實(shí)現(xiàn)作為畢業(yè)設(shè)計(jì)，是本人目前做過的最大的程序?；?JAVA 聊天系統(tǒng)設(shè)計(jì)與實(shí)現(xiàn)畢業(yè)設(shè)計(jì)正是建立在 Java 平臺(tái)上，是本人以前未曾接觸過的領(lǐng)域。 學(xué)習(xí)該平臺(tái)背景和功能的時(shí)間遠(yuǎn)遠(yuǎn)超出了我想象的時(shí)間。為了進(jìn)一步探 索深層次的技巧，我花費(fèi)了大量時(shí)間在 sun的 Java主頁上，閱讀了十幾篇技巧和代碼樣例。 我在一個(gè)月內(nèi)寫完這個(gè)程序，經(jīng)過了很多次的調(diào)試，終于完成了現(xiàn)在的程序。 基于 java 的網(wǎng)絡(luò)安全聊天工具：網(wǎng)絡(luò)功能部分 27 致謝語 緊張而忙碌的畢業(yè)設(shè)計(jì)就要結(jié)束了，在完成了系統(tǒng)的 功能設(shè)計(jì)后，我感到由衷的喜悅和自豪。 首先，我要感謝學(xué)校的老師在畢業(yè)設(shè)計(jì)期間給了我悉心的關(guān)懷與幫助，并且給了我許多關(guān)鍵的，建設(shè)性的指導(dǎo)。可以這樣說，用計(jì)算機(jī)來解決繁重而低效的手工管理工作，計(jì)算機(jī)發(fā)展史上的必然。在這次的畢業(yè)設(shè)計(jì)中，我曾 遇到了許多困難，而在克服這些困難的過程中，我的各方面的能力又有了很大的提高，使我的理論知識(shí)更好的與實(shí)踐相結(jié)合，增強(qiáng)了專業(yè)技能的可實(shí)踐性。通過這次的畢業(yè)設(shè)計(jì)，我真正了解了軟件工程設(shè)計(jì)的整個(gè)過程，既鞏固了以前的理論知識(shí)，也為我以后的工作奠定了良好的基礎(chǔ)。最后，請(qǐng)?jiān)试S我再一次向畢業(yè)期間無私 幫助過我的老師，同學(xué)和朋友表示最衷心的感謝。t agree with the disciplinary action your employer has taken against you ? your employer dismisses you and you think that you have been dismissed unfairly. For more information about dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven39。t charge you more than 35% of your pensation if you win the case. If you are thinking about signing up for a damagesbased agreement, you should make sure you39。s antiracism taskforce, is in London for the Football Association39。s Premier League match at Chelsea on Sunday. 基于 java 的網(wǎng)絡(luò)安全聊天工具：網(wǎng)絡(luò)功能部分 29 I am going to be at the match tomorrow and I have asked to meet Yaya Toure, he told BBC Sport. For me it39。s 21 win. Michel Platini, president of European football39。s actions. CSKA said they were surprised and disappointed by Toure39。 May be back in the past, to oneself the paranoid weird belief disillusionment, these days, my mind has been very messy, in my mind constantly. Always feel oneself should go to do something, or write something. Twenty years of life trajectory deeply shallow, suddenly feel something, do it. 一字開頭的年齡已經(jīng)到了尾聲。總覺得自己自己似乎應(yīng)該去做點(diǎn)什么，或者寫點(diǎn)什么。 The end of our life, and can meet many things really do? 而窮盡我們的一生，又能遇到多少事情是真正地非做不可？ During my childhood, think lucky money and new clothes are necessary for New Year, but as the advance of the age, will be more and more found that those things are optional。t really grow up, it seems is not so important。t want to give vent to out your inner voice can be in the high school children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。 Originally, this world, can produce a chemical reaction to an event, in addition to resolutely, have to do, and time. 原來，這個(gè)世界上，對(duì)某個(gè)事件能產(chǎn)生化學(xué)反應(yīng)的，除了非做不可的堅(jiān)決，還有，時(shí)間。s time, your ideas are always special to clear. Want, want, line is clear, as if nothing could shake his. Also once seemed to be determined to do something, but more often is he backed out at last. Dislike his cowardice, finally found that there are a lot of love, there are a lot 基于 java 的網(wǎng)絡(luò)安全聊天工具：網(wǎng)絡(luò)功能部分 30 of miss, like shadow really have been doomed. Those who do, just green years oneself give oneself an arm injection, or is a selfrighteous spiritual. 一個(gè)人的時(shí)候，自己的想法總是特別地清晰。也曾經(jīng)好像已經(jīng)下定了決心去做某件事，但更多的時(shí)候是最后又打起了退堂鼓。那些曾經(jīng)所謂的非做不可，只是青蔥年華里自己給自己注射的一支強(qiáng)心劑，或者說，是自以為是的精神寄托罷了。 Those were broken into various shapes of stationery。 Have declared the end of the encounter that haven39。突然想到那件藍(lán)格子襯衫；那些被折成各種各樣形狀的信紙；那段從街角深巷伊始的友誼；還有那場(chǎng)還沒有開始就宣告了終結(jié)的邂逅計(jì)劃 …… 那些年那些天的非做不可，終于和青春一樣，都將在我們的人生中謝幕。ll be traveling fast, so despite the distance, it will not be like diving into 基于 java 的網(wǎng)絡(luò)安全聊天工具：網(wǎng)絡(luò)功能部分 31 the deep end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jump When he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely. If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。t. Baumgartner still will free fall at a speed that would cause you and me to pass out, and no parachute is guaranteed to work higher than 25,000 feet (7,620 meters). cause there