加密/解密文件。用于加密/解密的ASCII +1

Question

我试图读取一个文本文件，并将每个字母“加密”/从ASCII表转换为+1（我也想“解密”，所以-1） 。所以“a”将变成“b”，“b”变成“c”等等。我只需要转换字母（忽略其他所有内容，按照原样打印）。我有麻烦与这部分代码：

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我已经想通了如何+1炭，但我不知道如何添加回数组或打印出来正确（因为“morewords.add（ch）”只会添加字符，而不是转换所有的字符添加一个字符串）。 “words.get（i）.length（）”取整数组“words”的整个长度，当我只想将字符串@位置“i”的长度放在数组中时，它会抛出错误，因为长度数组的长度比字符串长。我一直坚持这几个小时，我无法弄清楚。我在想，也许我不应该以字符串的形式阅读它们，应该以字符的形式阅读它们，这可能会更简单？

public static void main(String[] args) { 

     Scanner in = new Scanner(System.in); 
     ArrayList<String> words = new ArrayList<String>(); 
     ArrayList<Character> morewords = new ArrayList<Character>(); 
     String fileName = ""; //Replace Test with this 
     File f; 
     Scanner fileIn; 

     System.out.println("Please enter a file name for encryption: "); 
     //fileName = in.nextLine(); 
     fileName = "Test.txt"; 


     try 
     { 
      //Build the file and attach a scanner to it 
      f = new File (fileName); 
      fileIn = new Scanner (f);    

      System.out.println(f.exists()); //For errors 
      int counting = 0; 

      //Reads in indvidual strings. 
      for(counting =0; fileIn.hasNext(); counting++) 
      {     
       words.add(fileIn.next()); 
       System.out.println(words); 
      }    

      PrintWriter fileOut = new PrintWriter ("Backwards.txt"); 

      for(int i = 0; i <= words.size(); i++) 
      {     
       for(int j = 0; j <= words.get(i).length(); j++) 
       { 
        char ch = ' '; 
        ch = words.get(i).charAt(j); 
        ch += 1;      
        morewords.add(ch); 
       }    
       fileOut.print(morewords.get(i) + " "); 
      }    

      fileOut.close();    

     } 
     catch(FileNotFoundException e) 
     { 
      System.out.println("Couldn't find file"); 
     } 

    } 

Answer 1

首先在一个for循环是对你最后的长度为1的

什么我已经改变做

for (int i = 0; i <= words.size()-1; i++){} 

如果找你从0开始的

PrintWriter fileOut = new PrintWriter("C:/Backwards.txt"); 
     for (int i = 0; i <= words.size()-1; i++) 
     { 
      for (int j = 0; j <= words.get(i).length()-1; j++) 
      { 
       char ch = ' '; 
       ch = words.get(i).charAt(j); 
       ch ++; // +=1 
       morewords.add(ch); 
       fileOut.print(ch); 
      } 
      fileOut.print(" "); 
     } 

     fileOut.close(); 

它输出正确，如果我理解正确=）

这是我的代码

public static void main(String[] args) throws Exception 
{ 
    BufferedReader inChannel = new BufferedReader(new FileReader("C:/script.txt")); 
    BufferedWriter outChannel = new BufferedWriter(new FileWriter("C:/output.txt")); 
    String toParse = ""; 
    while ((toParse = inChannel.readLine()) != null) 
    { 
     String toWrite = ""; 
     for(int i=0; i!=toParse.length();i++) 
     { 
      char c = toParse.charAt(i); 
      if(true) //check if must be encoded or not 
      { 
       c++; 
       toWrite += c; 
      } 
     } 
     outChannel.write(toWrite); 
     outChannel.newLine(); 
    }  
    inChannel.close(); 
    outChannel.close(); 
} 

希望帮助