Java C++ Socket通讯

import java.net.*;

import javax.swing.plaf.SliderUI;

/**
* 与c语言通信(java做client,c/c++做server,传送一个结构)
*
*/
public class Employee {
private byte[] buf = new byte[28]; // 为说明问题,定死大小,事件中可以灵活处理


  /**
  * 将int转为低字节在前,高字节在后的byte数组
  */
  private static byte[] tolh(int n) {
    byte[] b = new byte[4];
    b[0] = (byte) (n & 0xff);
    b[1] = (byte) (n >> 8 & 0xff);
    b[2] = (byte) (n >> 16 & 0xff);
    b[3] = (byte) (n >> 24 & 0xff);
    return b;
  }
  /**
  * 将byte数组转化成String
  */
  private static String toStr(byte[] valArr,int maxLen) {
    int index = 0;
    while(index < valArr.length && index < maxLen) {
      if(valArr[index] == 0) {
        break;
      }
      index++;
    }
    byte[] temp = new byte[index];
    System.arraycopy(valArr, 0, temp, 0, index);
    return new String(temp);
  }
  /**
  * 将低字节在前转为int,高字节在后的byte数组
  */
  private static int vtolh(byte[] bArr) {
    int n = 0;
    for(int i=0;i<bArr.length&&i<4;i++){
      int left = i*8;
      n+= (bArr[i] << left);
    }
    return n;
  }
  public String name = "";
  public int id = 0;
  public float salary = 0;
  /**
  * 将float转为低字节在前,高字节在后的byte数组
  */
  private static byte[] tolh(float f) {
    return tolh(Float.floatToRawIntBits(f));
  }
  private static Employee getEmployee(byte[] bArr) {
    String name = "";
    int id = 0;
    float salary = 0;
    byte[] temp = new byte[20];
    name = toStr(bArr,20);
    System.arraycopy(bArr, 20, temp, 0, 4);
    id = vtolh(temp);
    return new Employee(name, id, salary);
  }
  /**
  * 构造并转换
  */
  public Employee(String name, int id, float salary) {
    this.name = name;
    this.id = id;
    this.salary = salary;
    byte[] temp = name.getBytes();
    System.arraycopy(temp, 0, buf, 0, temp.length);
    temp = tolh(id);
    System.arraycopy(temp, 0, buf, 20, temp.length);
    temp = tolh(salary);
    System.arraycopy(temp, 0, buf, 24, temp.length);
  }
  /**
  * 返回要发送的数组
  */
  public byte[] getbuf() {
    return buf;
  }
  /**
  * 发送测试
  */
  public static void main(String[] args) {
    try {
      int index = 0;
      byte[] receive = new byte[28];
      while(true){
        Socket sock = new Socket("localhost", 5050);
        System.out.println("send content: name=kingfish "+"value="+(1+index));
        sock.getOutputStream().write(new Employee("kingfish"+index, 1+index++, 10.99f + index).getbuf());
        sock.getInputStream().read(receive);
        Employee ee = getEmployee(receive);
        printHexString(receive);
        System.out.println(" response: name="+ee.name+" "+"value="+ee.id);
        sock.close();
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  /**
  *
  *输出十六进制
  */
  private static void printHexString(byte[] b){
    String sd ="";
    for(int i=0;i<b.length;i++){
      String hex = Integer.toHexString(b[i] & 0xFF);
      if(hex.length() == 1){
        hex = '0' + hex;
      }
      sd = sd + hex.toUpperCase();
    }
    char[] strChar = sd.toCharArray();
    for(char aa:strChar){
      System.out.print(aa);
    }
    System.out.println("");
  }
}

 

 

----------------------------------------------------------------------------------------

#include<iostream>
#include<stdlib.h>
#include<string.h>

#include <stdio.h>
#include <WINSOCK2.H>

using namespace std;

struct UserInfo {
  int age;
  char UserName[20];
  int UserId;
};
struct Employee {
  UserInfo user;
  float salary;
};

namespace EP
{
  void func()
  {
    WSADATA wsaData;
    char buf[1024];
    int nBytes = 1024, recvbytes;
    SOCKET Listening;
    SOCKET NewConnection;
    SOCKADDR_IN ServerAddr;
    SOCKADDR_IN ClientAddr;
    int ClientAddrLen = sizeof(ClientAddr);
    int Port = 5050;
    //int c;
    WSAStartup(MAKEWORD(2, 2), &wsaData);
    Listening = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    ServerAddr.sin_family = AF_INET;
    ServerAddr.sin_addr.s_addr = htonl(INADDR_ANY);
    ServerAddr.sin_port = htons(Port);

    bind(Listening, (SOCKADDR *)&ServerAddr, sizeof(ServerAddr));
    listen(Listening, 5);
    printf("Wating accpet....\n");


    while (true) {
      NewConnection = accept(Listening, (SOCKADDR *)&ClientAddr, &ClientAddrLen);
      printf("Wating recv.....\n");
      if ((recvbytes = recv(NewConnection, buf, nBytes, 0)) == SOCKET_ERROR)
      {
        printf("\nErrorcode=%d, Recv from client\n", WSAGetLastError());
        //return 0;
      }
      Employee *data = new Employee;
      data = (Employee *)&buf;

      printf("Userid: %d Username: %s Salary: %f", data->user.UserId, data->user.UserName, data->salary);
      data->user.UserId = 006;
      //data->user.age = 23;
      strcpy_s(data->user.UserName, "Test");
      data->salary = 800;

      send(NewConnection, buf, recvbytes, 0);

    }
    //return 0;
  }
}
#pragma warning(disable:4996)

int main(void)
{
  EP::func();

  system("pause");

  return 0;
}

 

转自:http://blog.csdn.net/nupt123456789/article/details/8047619

posted @ 2017-06-14 08:11  西北逍遥  阅读(735)  评论(0编辑  收藏  举报