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;
}
