使用socket封装一个java操作redis的工具类

好的，以下是一个简单的使用Socket封装的Java操作Redis的工具类：

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;

public class RedisUtils {

    private static final String HOST = "127.0.0.1";
    private static final int PORT = 6379;

    private Socket socket;
    private InputStream input;
    private OutputStream output;

    public RedisUtils() {
        try {
            this.socket = new Socket(HOST, PORT);
            this.input = socket.getInputStream();
            this.output = socket.getOutputStream();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public String set(String key, String value) {
        String result = null;
        try {
            output.write(("SET " + key + " " + value + "\r\n").getBytes());
            byte[] bytes = new byte[1024];
            int length = input.read(bytes);
            result = new String(bytes, 0, length);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    public String get(String key) {
        String result = null;
        try {
            output.write(("GET " + key + "\r\n").getBytes());
            byte[] bytes = new byte[1024];
            int length = input.read(bytes);
            result = new String(bytes, 0, length);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    public List<String> lrange(String key, int start, int end) {
        List<String> result = new ArrayList<>();
        try {
            output.write(("LRANGE " + key + " " + start + " " + end + "\r\n").getBytes());
            byte[] bytes = new byte[1024];
            int length = input.read(bytes);
            String str = new String(bytes, 0, length);
            if (str.startsWith("*")) {
                int count = Integer.parseInt(str.substring(1, str.indexOf("\r\n")));
                for (int i = 0; i < count; i++) {
                    length = input.read(bytes);
                    result.add(new String(bytes, 0, length).trim());
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    public void close() {
        try {
            input.close();
            output.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

这个工具类实现了Redis的三个基本操作：SET、GET和LRANGE。其中，SET和GET操作都是将字符串拼接成Redis协议格式，然后通过Socket发送给Redis服务端，最后接收Redis服务端返回的数据，转换成Java字符串格式并返回。LRANGE操作稍微复杂一些，因为需要接收Redis服务端返回的多个字符串，所以需要对返回的数据进行解析。最后，还提供了一个close方法，用于关闭Socket连接。