C++服务器与java进行socket通信案例

(一)项目概述：
C++服务器是之前编写好的，有对应的C++客户端。因此，服务器的C++代码不能改变。主要解决的问题是：
1.如何用java类来还原服务器中的结构体
2.数据之间的转换
3.socket通信数据统一用字节数组。
(二)首先看一下服务器的代码：(360安全卫士竟然说我的代码是木马...好吧，这个服务器不就是能联网，能获取本地数据么？确实有点像木马，但绝对不是！)
/*主要功能是获得系统硬盘符号及硬盘下的目录和文件*/
[C++ code]

[cpp]
// FileNetServer.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "FileNetServer.h"
#include <winsock.h>
#include <windows.h>
#include "SYS.H"

#pragma comment(lib, "ws2_32")

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

typedef struct
{
    int ID;
    BYTE lparam[BUF_LEN*2];
}COMMAND;
/*BOOL 4byte HICON 4byte*/
typedef struct
{
    char FileName[MAX_PATH];//260byte
    int FileLen;
    char Time[50];
    BOOL IsDir;
    BOOL Error;
    HICON hIcon;
}FILEINFO;

BOOL DeleteDirectory(char *DirName);
BOOL CapScreen(LPTSTR FileName);

DWORD WINAPI SLisen(LPVOID lparam);
DWORD GetDriverProc(COMMAND command, SOCKET client);
DWORD GetDirInfoProc(COMMAND command, SOCKET client);
DWORD ExecFileProc(COMMAND command, SOCKET client);
DWORD DelFileProc(COMMAND command, SOCKET client);
DWORD FileInfoProc(COMMAND command, SOCKET client);
DWORD CreateDirProc(COMMAND command, SOCKET client);
DWORD DelDirProc(COMMAND command, SOCKET client);
DWORD GetFileProc(COMMAND command, SOCKET client);
DWORD PutFileProc(COMMAND command, SOCKET client);
DWORD GetScreenProc(COMMAND command, SOCKET client);

/////////////////////////////////////////////////////////////////////////////
// The one and only application object

CWinApp theApp;

using namespace std;

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{

    WSADATA wsadata;
    SOCKET FileNetServer;
    SOCKET client;
    SOCKADDR_IN FileNetServeraddr;
    SOCKADDR_IN clientaddr;
    int port = 17329;

    WORD ver = MAKEWORD(2,2);
    WSAStartup(ver, &wsadata);

    FileNetServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    FileNetServeraddr.sin_family = AF_INET;
    FileNetServeraddr.sin_port = htons(port);
    FileNetServeraddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);

    bind(FileNetServer, (SOCKADDR*)&FileNetServeraddr, sizeof(FileNetServeraddr));

    listen(FileNetServer, 5);

    int len = sizeof(clientaddr);
    char s_password[100];

    while(true)
    {
        if(client = accept(FileNetServer, (sockaddr*)&clientaddr, &len))
        {

            if(send(client, "Password", sizeof("Password"), 0) != SOCKET_ERROR)
            {
                cout<<"有客户请求连接，正在等待客户输入密码!";
            }
ag:         if(recv(client, s_password, sizeof(s_password), 0) != SOCKET_ERROR)
            {
                if(strcmp(s_password, "123") == 0)
                {
                    send(client, "OK", sizeof("OK"), 0);
                    cout<<"CreateThread is the OK \n";
                    CreateThread(NULL, NULL, SLisen, (LPVOID)client, NULL, NULL);
                }
                else
                {
                    cout<<"有用户试图联入，但是未能输入正确密码!/n";
                    send(client, "NOOK", sizeof("NOOK"), 0);
                    goto ag;
                }
            }
        }
    }

    closesocket(FileNetServer);
    closesocket(client);
    WSACleanup();

    return 0;
}

DWORD WINAPI SLisen(LPVOID lparam)
{
    SOCKET client = (SOCKET)lparam;

    COMMAND command;

    while(1)
    {
        memset((char*)&command, 0, sizeof(command));
        if(recv(client, (char*)&command, sizeof(command), 0) == SOCKET_ERROR)
        {
            cout<<"The Client Socket is Closed\n";
            break;
        }
        else
        {

补充：软件开发 , C++ ,