用Java实现数据的k匿名

好的，以下是一个使用Java实现数据的K匿名的代码示例：

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.*;

public class DataKAnonymity {

    // 读取数据
    public static List<String[]> readData(String filename) throws IOException {
        List<String[]> data = new ArrayList<String[]>();
        BufferedReader reader = new BufferedReader(new FileReader(filename));
        String line;
        while ((line = reader.readLine()) != null) {
            String[] record = line.split(",");
            data.add(record);
        }
        reader.close();
        return data;
    }

    // 数据分组
    public static Map<String, List<String[]>> group(List<String[]> data, int k, int[] attributeIndices) {
        Map<String, List<String[]>> groups = new HashMap<String, List<String[]>>();
        for (String[] record : data) {
            String[] attributes = new String[attributeIndices.length];
            for (int i = 0; i < attributeIndices.length; i++) {
                attributes[i] = record[attributeIndices[i]];
            }
            String groupKey = String.join(",", attributes);
            if (!groups.containsKey(groupKey)) {
                groups.put(groupKey, new ArrayList<String[]>());
            }
            groups.get(groupKey).add(record);
        }
        for (List<String[]> group : groups.values()) {
            while (group.size() < k) {
                group.add(group.get(0));
            }
        }
        return groups;
    }

    // 数据扰动
    public static void perturb(List<String[]> data, int[] attributeIndices) {
        for (String[] record : data) {
            for (int i : attributeIndices) {
                String originalValue = record[i];
                String perturbedValue = originalValue + Math.random();
                record[i] = perturbedValue;
            }
        }
    }

    // 输出数据
    public static void writeData(List<String[]> data, String filename) throws IOException {
        StringBuilder builder = new StringBuilder();
        for (String[] record : data) {
            builder.append(String.join(",", record)).append("\n");
        }
        FileWriter writer = new FileWriter(filename);
        writer.write(builder.toString());
        writer.close();
    }

    public static void main(String[] args) throws IOException {
        // 读取数据
        String filename = "data.csv";
        List<String[]> data = readData(filename);

        // 对姓名和年龄属性进行K匿名，要求每组至少包含2条记录
        int k = 2;
        int[] attributeIndices = new int[] { 0, 1 };
        Map<String, List<String[]>> groups = group(data, k, attributeIndices);
        for (List<String[]> group : groups.values()) {
            perturb(group, attributeIndices);
        }

        // 输出处理后的数据
        String outputFilename = "data_k_anonymity.csv";
        writeData(data, outputFilename);
    }
}

该代码实现了数据的K匿名的三个步骤：读取数据、数据分组和数据扰动。其中，数据分组按照姓名和年龄属性进行分组，保证每组至少包含2条记录；数据扰动对每组内的姓名和年龄属性进行随机扰动。执行该代码后，输出处理后的数据到文件"data_k_anonymity.csv"中。