2.20 代碼解題：

package mima_210;public class Main {public static void main(String[] args) {// TODO Auto-generated method stubString str="I thought to see the fairies in the"+ "fields,but I saw only th evil elephants"+ "with their black backs!Woe!how that"+ "sight awed me! The elves danced all"+"around and about while I heard voices"+"calling clearly.Ah! how I tried to"+"see-throw off the ugly clout-but no blind"+"eye of a mortal was permitted to spy"+"them.So then came minstrels,having gold"+"trumpets,harps and drums.These palyed"+"very loudly beside me,breaking that spell"+"So the dream vanished, whereat I thanked"+"Heaven.I shed many tears before the thin"+"straw.Now though the Enchanter gnash"+"Spring returns. Oh,wretched man!Hell"+"gapes, Erebus now lies open.The mouths"+"of Death wait on thy end.";String indexs="787656543432112343456567878878765654"+ "3432112343456567878878765654433211234";//首先對該字符串進(jìn)行篩選，將空格標(biāo)點(diǎn)去掉String newStr="";for(int t=0;t<str.length();t++){char c=str.charAt(t);if((c<='z'&&c>='a')||(c<='Z'&&c>='A')){newStr+=c;}}System.out.println("密鑰長度為："+indexs.length()+"字符串長度為："+newStr.length());//每五組一行的格式輸出整理好的字符串for(int i=0;i<indexs.length()-9;i++){if(i%6==0&&i!=0)System.out.println();for(int j=0;j<8;j++){System.out.print(newStr.charAt(j+i*8));}System.out.print(" ");}//輸出密文System.out.println();System.out.print("密文為：");for(int i=0;i<indexs.length()-9;i++){int j=indexs.charAt(i)-48;System.out.print(newStr.charAt(j+i*8-1));}} }

運(yùn)行結(jié)果如下：

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密鑰長度為：73字符串長度為：514

Ithought?? toseethe??fairiesi?? nthefiel?? dsbutIsa??wonlythe??

vileleph?? antswith??theirbla?? ckbacksW?? oehowtha??tsightaw??

edmeThee?? lvesdanc??edallaro?? undandab?? outwhile??Iheardvo??

icescall?? ingclear??lyAhhowI?? triedtos?? eethrowo??fftheugl??

ycloutbu?? tnoblind??eyeofamo?? rtalwasp?? ermitted??tospythe??

mSothenc?? ameminst??relshavi?? nggoldtr?? umpetsha??rpsanddr??

umsThese?? palyedve??ryloudly?? besideme?? breaking??thatspel??

lSothedr?? eamvanis??hedwhere?? atIthank? ?edHeaven??Ishedman??

ytearsbe?? forethet??hinstraw?? Nowthoug?? htheEnch??antergna??

shSpring?? returnsO??hwretche?? dmanHell?? gapesEre??busnowli??

esopenTh?? emouthso??fDeathwa?? itonthye??

密文為：hesittlseahselddweslodogunopeennhdtasylebtSmwIedstruhngOhlrwehtn

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由于覺得個(gè)人手工來統(tǒng)計(jì)密文，會很容易出現(xiàn)失誤和偏差，所以將該過程編寫程序處理，編程過程中發(fā)現(xiàn)密鑰的長度較長，沒有足夠的字符串供密鑰使用，故認(rèn)為該題目所給信息存在問題。但是，對于該加密解密方法可以認(rèn)同。此外，為了編程處理簡便，將最后的兩個(gè)字母省略掉了。

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與50位技術(shù)專家面對面20年技術(shù)見證，附贈技術(shù)全景圖

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