JAVA文件读取与写文件（实现一个从1.txt修改内倒到2.txt的功能）

前提，整理excel文本内容到word中

整理前

整理后

写了一个java类对不规则的文本进行处理

public class ReadTxt {

    public static void main(String[] args) {
        readAndWriteFile_simple("D:\\IDEA-workspace\\MyJavaApplication\\MyJavaApplication\\txt\\work.txt",
                "D:\\IDEA-workspace\\MyJavaApplication\\MyJavaApplication\\txt\\work_output.txt"
        );
        readAndWriteFile("D:\\IDEA-workspace\\MyJavaApplication\\MyJavaApplication\\txt\\work1.txt",
                "D:\\IDEA-workspace\\MyJavaApplication\\MyJavaApplication\\txt\\work1_output.txt"
        );
        readAndWriteFile("D:\\IDEA-workspace\\MyJavaApplication\\MyJavaApplication\\txt\\work2.txt",
                "D:\\IDEA-workspace\\MyJavaApplication\\MyJavaApplication\\txt\\work2_output.txt"
        );
    }

    public static void readAndWriteFile_simple(String inputFilePath, String outputFilePath) {
        try (BufferedReader reader = new BufferedReader(new FileReader(inputFilePath));
             BufferedWriter writer = new BufferedWriter(new FileWriter(outputFilePath))) {

            String line;
            StringBuilder content = new StringBuilder();
            while ((line = reader.readLine()) != null) {
                // 移除行尾的换行符，如果有的话
                line = line.trim();

                // 如果该行非空，则添加到内容中
                if (!line.isEmpty()) {
                    content.append(line);
                    content.append("、"); // 在每个文本行之后添加“、”
                }
            }

            // 去除最后一个多余的“、”
            if (content.length() > 0) {
                content.setLength(content.length() - 1);
            }

            // 将处理后的内容写入输出文件
            writer.write(content.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void readAndWriteFile(String inputFilePath, String outputFilePath) {
        try (BufferedReader br = new BufferedReader(new FileReader(inputFilePath));
             BufferedWriter bw = new BufferedWriter(new FileWriter(outputFilePath))) {
            String line;
            int count = 1;
            Set<String> uniqueLines = new HashSet<>(); // 用于存储唯一行
            while ((line = br.readLine()) != null) {
                // 去掉空行
                if (line.trim().isEmpty()) {
                    continue;
                }
                if ("\"".equals(line)) {
                    continue;
                }
                // 检查行是否以数字开头，如果不是则重新编号
                if (!Character.isDigit(line.charAt(0))) {
                    line = java.lang.String.format("%d、%s", count, line.substring(line.indexOf("、") + 1));
                } else {
                    // 提取行号并检查是否正确，如果不正确则重新编号\
                    try {
                        int lineNumber = Integer.parseInt(line.substring(0, line.indexOf("、")));
                        if (lineNumber != count) {
                            line = java.lang.String.format("%d、%s", count, line.substring(line.indexOf("、") + 1));
                        }
                    } catch (NumberFormatException e) {
                        line = java.lang.String.format("%d、%s", count, line.substring(line.indexOf("、") + 1));
                    }
                }
                // 去掉重复行
                if (!uniqueLines.contains(line)) {
                    bw.write(line);
                    bw.newLine(); // 写入新的一行
                    uniqueLines.add(line); // 将当前行添加到集合中
                }
                count++;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}