Socket向服务端发送消息工具类

最新推荐文章于 2025-07-08 12:23:12 发布

原创最新推荐文章于 2025-07-08 12:23:12 发布 · 3.2k 阅读

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#socket #string #exception #null #class #工具

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本文介绍了一个Java Socket客户端的实现示例，包括如何连接到指定的主机和端口，发送消息，并接收服务器响应的方法。此外还提供了两种模式：一种是发送消息并等待回复，另一种是仅发送消息不等待回复。

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package com.yanek.util.socket;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.Socket;
import java.net.URLEncoder;

import org.apache.log4j.Logger;

/**
* Socket客户端,向服务端发送消息
*
*
*/
public class SocketClient {
private static Logger logger = Logger.getLogger(SocketClient.class
.getName());
private static final int MAX_TIMEOUT = 10;

private SocketClient() {
}

/**
* 向服务端发送消息
*
* @param host
*            主机Host或IP
* @param port
*            端口
* @param timeout
*            超时,单位秒
* @param content
*            发送内容
*/
public static void send(String host, int port, int timeout, String content) {
  Socket s = null;
  PrintWriter out = null;
  try {
   s = new Socket(host, port);
   s
     .setSoTimeout((timeout > MAX_TIMEOUT ? MAX_TIMEOUT
       : timeout) * 1000);
   out = new PrintWriter(s.getOutputStream());
   out.write(content);
   out.flush();
  } catch (Exception e) {
   logger.error(e);
  } finally {
   if (s != null)
    try {
     s.close();
    } catch (IOException e) {
    }
   if (out != null)
    out.close();
   s = null;
   out = null;
  }
}

/**
* 向SocketServer发送通信指令并获取回复数据
*
* @param host 主机名称或IP
* @param port 端口
* @param timeout 超时时间(秒)
* @param content 指令内容
* @return
*/
public static String sendAndGetReply(String host, int port, int timeout,
   String content) {
  String encode = "utf-8";
  Socket s = null;
  BufferedReader in = null;
  PrintWriter out = null;
  String line = null;
  try {
   content = URLEncoder.encode(content, encode);
   s = new Socket(host, port);
   s
     .setSoTimeout((timeout > MAX_TIMEOUT ? MAX_TIMEOUT
       : timeout) * 1000);
   in = new BufferedReader(new InputStreamReader(s.getInputStream()));
   out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(s
     .getOutputStream())), true);
   out.println(content);
   line = in.readLine();
  } catch (Exception e) {
   logger.error(e);
  } finally {
   if (s != null)
    try {
     s.close();
    } catch (IOException e) {
    }
   if (out != null)
    out.close();
   if (in != null)
    try {
     in.close();
    } catch (IOException e) {
    }
   s = null;
   out = null;
   in = null;
  }
  try {
   line = URLEncoder.encode(line, encode);
  } catch (UnsupportedEncodingException e) {
   logger.error(e);
  }
  return line;
}

/**
* 向SocketServer发送通信指令,无同步回复消息
*
* @param host 主机名称或IP
* @param port 端口
* @param timeout 超时时间(秒)
* @param content 指令内容
* @return
*/
public static void sendAndNoReply(String host, int port, int timeout,
   String content) {
  String encode = "utf-8";
  Socket s = null;
  PrintWriter out = null;
  try {
   content = URLEncoder.encode(content, encode);
   s = new Socket(host, port);
   s
     .setSoTimeout((timeout > MAX_TIMEOUT ? MAX_TIMEOUT
       : timeout) * 1000);
   out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(s
     .getOutputStream())), true);
   out.println(content);
  } catch (Exception e) {
   logger.error(e);
  } finally {
   if (s != null)
    try {
     s.close();
    } catch (IOException e) {
    }
   if (out != null)
    out.close();
   s = null;
   out = null;
  }
}
}