java - 写入新的文本文件

Question

我读取一个文件并创建一个新文件，该文件复制其中的某些部分，删除一些行并将其替换为其他行。输入 arraystring raw 的类型为 [Aaa,Bbb,Ccc,..]，用于替换部分行。在新文件中，未编辑的部分会正确打印，但已编辑的部分会以这种方式打印。第一个被打印，第二个没有，第三个是，第四个没有，第五个是......看起来当我编辑一行时我也删除了下面的一行。我尝试删除 out.write("\n") 或 Scanner.nextLine() ，但它也不起作用。有什么想法我可以尝试吗？提前致谢

For example:

    OLD TEXT: 
    .....
    LINE 6 / contains j(ac)
    LINE 7 / contains i(ac)
    LINE 8 / contains k(ac)
    LINE 9 / contains mp(ac)
    LINE 10 /contains bp(ac)
    .....

    NEW TEXT (NEW FILE):
     .....
    LINE NEW6 
    LINE NEW7 
    LINE NEW8 
    LINE NEW9 
    LINE NEW10 
    .....

<小时/>

public static void main(String[] args) {
    new class();
    class.query();

    File file = new File("file");   
    File filenew = new File("file");

    try {


        PrintWriter out = new PrintWriter(new FileWriter(filenew, true));
        Scanner scanner = new Scanner(file);

        while (scanner.hasNextLine()) {
            String line = scanner.nextLine();
            if (line.contains("j(ac)")) {  
                String newline = line.replaceAll("/.*?/", "/"+raw1+"/");
                scanner.nextLine();
                out.write(newline);
                out.write("\n");
            } else if (line.contains("i(ac)")) {  
                String newline = line.replaceAll("/.*?/", "/"+raw2+"/");
                scanner.nextLine();
                out.write(newline);
                out.write("\n");   
            } else if (line.contains("k(ac)")) { 
                String newline = line.replaceAll("/.*?/", "/"+raw3+"/");
                scanner.nextLine();
                out.write(newline);
                out.write("\n");       
            }else if (line.contains("mp(k)")) {   
                String newline = line.replaceAll("/.*?/", "/"+raw4+"/");
                scanner.nextLine();
                out.write(newline);
                out.write("\n");           
            }else if (line.contains("bp(k)")) {    
                String newline = line.replaceAll("/.*?/", "/"+raw5+"/");
                scanner.nextLine();
                out.write(newline);
                out.write("\n");
            } else{ 
                out.write(line);
                out.write("\n");
            }
      }
      out.flush();
      out.close();
      scanner.close();

 } catch (IOException e)  {
     e.printStackTrace();
 }

}
}

Answer 1

根据您在评论中提供的信息，应该是这样的。

1. Its line.contains that shows when i want to edit and which line.

2. That line that contains"" is the one I want to replace.

3. And all ifs I include should be used and printed.

String line; 
while (scanner.hasNextLine()) {
        // Get the line
        line = scanner.nextLine();
       
        // if line contains xxx then replace
        if (line.contains("j(ac)")) {  
            line = line.replaceAll("/.*?/", "/"+raw1+"/");

        } else if (line.contains("i(ac)")) {  
            line = line.replaceAll("/.*?/", "/"+raw2+"/");

        } else if (line.contains("k(ac)")) { 
            line = line.replaceAll("/.*?/", "/"+raw3+"/");

        }else if (line.contains("mp(k)")) {   
            line  = line.replaceAll("/.*?/", "/"+raw4+"/");
    
        }else if (line.contains("bp(k)")) {    
            line = line.replaceAll("/.*?/", "/"+raw5+"/");
           
        } 

        // Write the line with replaced items
        out.write(line);
        out.write("\n");
}

现在你的代码在做什么:

 while (scanner.hasNextLine()) {
            // get the line (very first line) and store that in "line"
            String line = scanner.nextLine();

            // check if line contains "j(ac)"
            if (line.contains("j(ac)")) { 

            // if "line" contains replace everything and save it to "newline" 
                String newline = line.replaceAll("/.*?/", "/"+raw1+"/");

            // get next line getting used for nothing (second line stored nowhere)
                scanner.nextLine();

            // write the newline to output file.
                out.write(newline);
                out.write("\n");
            } 


            // some more if else blocks executing same patterns explained above
            

             else{ 
            // if nothing contains in "line" then write to output file
                out.write(line);
                out.write("\n");
            }
      }