Java的socket实例

package net.test.com.common.util;

import lombok.extern.slf4j.Slf4j;
import net.test.com.common.exception.domain.BaseException;

import java.io.*;
import java.net.Socket;

@Slf4j
public class SocketClient {

    /**
     * 获取socket连接
     *
     * @param ip
     * @param port
     * @return
     */
    public static Socket getConnection(String ip, int port) {
        Socket socket = null;
        try {
            socket = new Socket(ip, port);
            socket.setSoTimeout(30000);
        } catch (IOException e) {
            log.error("获取socket连接失败", e);
            throw new BaseException("获取socket连接失败");
        }
        return socket;
    }

    /**
     * 发送报文
     *
     * @param socket
     * @param cmd
     * @return
     */
    private static String send(Socket socket, String cmd) {
        InputStream in = null;
        OutputStream out = null;
        BufferedReader br = null;
        try {
            // in代表服务器到客户端的流
            in = socket.getInputStream();
            // 代表客户端到服务器的流
            out = socket.getOutputStream();

            // 输入执行命令
            PrintWriter printWriter = new PrintWriter(out, true);
            printWriter.println(cmd);
            printWriter.flush();

            // 接收执行命令结果
            br = new BufferedReader(new InputStreamReader(in));
            return br.readLine();
        } catch (Exception e) {
            log.error("调用socket失败", e);
            throw new BaseException("调用socket失败");
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 关闭socket连接
     *
     * @param socket
     */
    private static void close(Socket socket) {
        if (socket != null) {
            try {
                socket.close();
            } catch (IOException e) {
                log.error("socket关闭失败", e);
                throw new BaseException("socket关闭失败");
            }
        }
    }

    /**
     * 发送消息
     *
     * @param host
     * @param port
     * @param msg
     */
    public static String sendSocketMessage(String host, int port, String msg) {
        Socket socket = null;
        String response = null;
        try {
            socket = getConnection(host, port);
            response = send(socket, msg);
        } finally {
            close(socket);
        }
        return response;
    }

    public static void main(String args[]) {
        String resp = sendSocketMessage("122.15.1.138", 5015, "reload vcc 782\r\n\r\n");
        log.info("socket返回:{}", resp);
    }

}