文本文件-多行字符串合并为一行

时间:2019-02-03 15:51:07

标签: java string text-files bufferedreader

我将解析txt文件并执行一些编辑任务。在将多行字符串更改为一个行字符串时,我卡住了。

工作流程: 1)将多行合并为一行 2)提取包含一些char或startsWith

的特定行

已经尝试了一些方法,但是没有理想的结果。

目标是拥有这一行:

Jrn.Directive "WindowSize"  , "[A.rvt]", "Floor Plan: Level 1" , 1912, 849

基于

 Jrn.Directive "WindowSize"  _
         , "[A.rvt]", "Floor Plan: Level 1" _
         , 1912, 849

尝试:

line.lines().collect(Collectors.joining("_"+"[\n]"));

line.replaceAll("  _\n" +
                        "         ,");

感谢任何建议 更新:

工作流程:

  1. 文本包含以下文本(这是整个txt文件的一小部分)-我无法将其粘贴为代码,请参见屏幕截图

    Jrn.Directive“ WindowSize” _ ,“ [[A.rvt]””,“平面图:1级” _ ,1912,849 '0:<。编组 '0:<... CompactCaching = 1(启用) '0:<.ThreadPool '0:<... ActivePoolSize = 51 '0:<... ConfiguredPoolSize =自动 '0:<... ParallelCores = 8 '0:<... RequestedPoolSize =自动 '0:<。 '0:<... ElemTable = 1(多线程时除外) '0:

请查看屏幕快照https://i.ibb.co/0cRrwcR/2019-02-03-1947.png

  1. 因为我要提取以 Jrn.D 开头的字符串,所以我需要 加入并获得

    Jrn.Directive“ WindowSize”,“ [A.rvt]”,“平面图:1级”,1912,849

我认为有必要先定义哪些行需要连接,然后提取包含有趣信息的行,例如以Jrn.D开头的行。

编码Im用于查找特定st的内容

import java.io.*;
import java.util.stream.Collectors;
public class ReadFromFile {
    public static void main(String [] args) {
        // The name of the file to open.
        String fileName = "test.txt";

        // This will reference one line at a time
        String line = null;

        try {
            // FileReader reads text files in the default encoding.
            FileReader fileReader =
                    new FileReader(fileName);

            // Always wrap FileReader in BufferedReader.
            BufferedReader bufferedReader =
                    new BufferedReader(fileReader);

            while((line = bufferedReader.readLine()) != null) {

            // Im defining which lines are important for me but firstly I 
            //need have them in one line especially when looking for Jrn
                if (line.startsWith("Jrn")|| 
                line.contains("started recording journal file")|| 
                line.contains("' Build:")|| line.contains("Dim Jrn"))
                System.out.println(line);
            }
            // Always close files.
            bufferedReader.close();
        }
        catch(FileNotFoundException ex) {
            System.out.println(
                    "Unable to open file '" +
                            fileName + "'");
        }
        catch(IOException ex) {
            System.out.println(
                    "Error reading file '"
                            + fileName + "'");
            // Or we could just do this:
            // ex.printStackTrace();
        }

    }
}

1 个答案:

答案 0 :(得分:0)

我认为要解决您的特定问题的最佳方式(对文件的侵入最少)是在Jrn.Directive元信息的末尾添加定界符(*)(如果在可能范围之内) ,例如:

Jrn.Directive "WindowSize" _ , "[A.rvt]", "Floor Plan: Level 1" _ , 1912, 849*

然后,您可以使用循环来顺序打印每个与定界符不匹配的令牌,并在匹配时中断循环。

类似这样的东西

    //File object instantiation
    File file = new File("test.txt");

    //Iterator which loops over every line in the file
    Iterator<String> iterator = Files.readAllLines(file.toPath()).iterator();

    //The end delimiter for you Jrn.Directive information
    String delimiter = "*";

    while(iterator.hasNext()) {
            //String to store current line
            String line = iterator.next();
            //Execute if line starts with Jrn.Directive
            if (line.startsWith("Jrn")) {
                //JrnLoop to serialize Jrn.Directive information
                JrnLoop: while(true) {
                    //Splitting and processing each character in the current line
                    for(String token: line.split("")) {
                        //Escape and break the JrnLoop if the current character matches end delimiter
                        if (token.matches(delimiter)) {
                            System.out.println();
                            break JrnLoop;
                        }
                        //Otherwise print the current character
                        System.out.print(token);
                    }
                    //Go to the next line of the Jrn.Directive information
                    line = iterator.next();
                }
            }
            //If the line does not start with Jrn.Directive
            else {
                System.out.println(line);

        }

关于为什么您的Jrn.Directive信息存储在文件中的多行中,我真的不知道