从指定文件中找出字符串“HikVison BLE”所在的行，然后查找此行的前面和后面最近的空行分别是哪两行，将这两行之间的所有字符复制到其他文件中。使用java

可以使用以下代码来实现：

import java.io.*;

public class FindString {
    public static void main(String[] args) {
        String inputFile = "input.txt";
        String outputFile = "output.txt";
        String targetString = "HikVison BLE";
        int beforeLine = 0;
        int afterLine = 0;
        boolean found = false;

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(inputFile)));
            BufferedWriter writer = new BufferedWriter(new FileWriter(outputFile));
            String line;
            int lineNumber = 0;

            while ((line = reader.readLine()) != null) {
                lineNumber++;

                if (line.contains(targetString)) {
                    found = true;
                    System.out.println("Found target string on line " + lineNumber);
                    beforeLine = findPreviousEmptyLine(reader, lineNumber);
                    afterLine = findNextEmptyLine(reader, lineNumber);

                    if (beforeLine != -1 && afterLine != -1) {
                        writer.write("Lines " + (beforeLine + 1) + " to " + (afterLine - 1) + ":\n");
                        reader = new BufferedReader(new InputStreamReader(new FileInputStream(inputFile)));

                        for (int i = 1; i <= afterLine; i++) {
                            line = reader.readLine();

                            if (i > beforeLine && i < afterLine) {
                                writer.write(line + "\n");
                            }
                        }
                    } else {
                        System.out.println("Could not find empty lines");
                    }

                    break;
                }
            }

            if (!found) {
                System.out.println("Target string not found");
            }

            reader.close();
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static int findPreviousEmptyLine(BufferedReader reader, int currentLine) throws IOException {
        String line;
        int lineNumber = currentLine - 1;

        while (lineNumber >= 1) {
            line = reader.readLine();

            if (line.equals("")) {
                return lineNumber;
            }

            lineNumber--;
        }

        return -1;
    }

    public static int findNextEmptyLine(BufferedReader reader, int currentLine) throws IOException {
        String line;
        int lineNumber = currentLine;

        while ((line = reader.readLine()) != null) {
            lineNumber++;

            if (line.equals("")) {
                return lineNumber;
            }
        }

        return -1;
    }
}

请将输入文件的名称替换为你的实际文件名称，然后运行该程序即可。找到的结果将被保存在输出文件中。