C++项目 | 集群聊天服务器 | 客户端首页功能开发

好友列表和离线消息表一般都是存储在本地，否则从服务器请求数据太多，但本项目采取从服务器拉取这两表。

1.代码

#include"json.hpp"
#include<iostream>
#include<thread>
#include<string>
#include<vector>
#include<chrono>
#include<ctime>
using namespace std;

using json=nlohmann::json;

#include<unistd.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<netinet/in.h>
#include<arpa/inet.h>

#include"group.hpp"
#include"user.hpp"
#include"public.hpp"

//记录当前系统登录的用户信息
User g_currentUser;

//记录当前登录用户的好友列表信息
vector<User> g_currentUserFriendList;

//记录当前登录用户的群组列表信息
vector<Group> g_currentUserGroupList;

//显示当前登录成功用户的基本信息
void showCurrentUserData();

//接收线程
void writeTaskHandler(int clientfd);

//获取系统时间 （聊天信息需要添加时间信息）
string getCurrentTime();

//主页面程序
void mainMenu();

//聊天客户端程序实现，main线程用作发送消息的线程，子线程用作接收消息的线程
int main(int argc,char **argv)
{
    if(argc<3)
    {
        cerr<<"command invalid!example: ./ChatClient 127.0.0.1 6000"<<endl;
        exit(-1);
    }

    //解析通过命令行参数传递的ip和port
    char *ip=argv[1];
    uint16_t port=atoi(argv[2]);

    //创建client端的socket
    int clientfd=socket(AF_INET,SOCK_STREAM,0);
    if(-1==clientfd)
    {
        cerr<<"socket create error"<<endl;
        exit(-1);
    }

    //填写client需要连接的server信息ip+port
    sockaddr_in server;
    memset(&server,0,sizeof(sockaddr_in));

    server.sin_family=AF_INET;
    server.sin_port=htons(port);
    server.sin_addr.s_addr=inet_addr(ip);

    //client和server连接
    if(-1==connect(clientfd,(sockaddr *)&server,sizeof(sockaddr_in)))
    {
        cerr<<"connect server error"<<endl;
        close(clientfd);
        exit(-1);
    }

    //main线程用于接收用户输入负责发送数据
    for(;;)
    {
        //显示首页页面菜单 登录、注册、退出
        cout<<"======================="<<endl;
        cout<<"1.login"<<endl;
        cout<<"2.register"<<endl;
        cout<<"3.quit"<<endl;
        cout<<"======================="<<endl;
        cout<<"choice:";
        int choice = 0;
        cin>>choice;
        cin.get();//读掉缓冲区残留的回车

        switch(choice)
        {
            case 1://login业务
            {
                int id=0;
                char pwd[50]={0};
                cout<<"userid:";
                cin>>id;
                cin.get();//读掉缓冲区残留的回车
                cout<<"userpassword:";
                cin.getline(pwd,50);

                json js;
                js["msgid"]=LOGIN_MSG;
                js["id"]=id;
                js["password"]=pwd;
                string request=js.dump();

                int len=send(clientfd,request.c_str(),strlen(request.c_str())+1,0);
                if(len==-1)
                {
                    cerr<<"send login msg error:"<<request<<endl;
                }
                else
                {
                    char buffer[1024]={0};
                    len=recv(clientfd,buffer,1024,0);
                    if(len==-1)
                    {
                        cerr<<"recv login msg error:"<<request<<endl;
                    }
                    else
                    {
                        json responsejs=json::parse(buffer);
                        if(0!=responsejs["errno"].get<int>())
                        {
                            cerr<<responsejs["errmsg"]<<endl;
                        }
                        else//登陆成功
                        {
                            //记录当前用户的id和name
                            g_currentUser.setId(responsejs["id"].get<int>());
                            g_currentUser.setName(responsejs["name"]);

                            //记录当前的好友列表
                            //如果这个人有好友
                            if(responsejs.contains("friends"))
                            {
                                vector<string> vec=responsejs["friends"];
                                for(string &str:vec)
                                {
                                    json js=json::parse(str);
                                    User user;
                                    user.setId(js["id"].get<int>());
                                    user.setName(js["name"]);
                                    user.setState(js["state"]);
                                    g_currentUserFriendList.push_back(user);
                                }
                            }

                            //记录当前用户的群组列表信息
                            if(responsejs.contains("groups"))
                            {
                                vector<string> vec1 = responsejs["groups"];
                                for (string &groupstr : vec1)
                                {
                                    json grpjs = json :: parse(groupstr);
                                    Group group;
                                    group.setId(grpjs["id"].get<int>());
                                    group.setName(grpjs["groupname"]);
                                    group.setDesc(grpjs["groupdesc"]);
                                    vector<string> vec2 = grpjs["users"];
                                    for (string &userstr : vec2)
                                    {
                                        GroupUser user;
                                        json js = json :: parse(userstr);
                                        user.setId(js["id"].get<int>());
                                        user.setName(js["name"]);
                                        user.setState(js["state"]);
                                        user.setRole(js["role"]);
                                        group.getUsers().push_back(user);
                                    }
                                    g_currentUserGroupList.push_back(group);
                                }
                            }

                            //显示登录用户的基本信息
                            showCurrentUserData();

                            //显示当前用户的离线消息 个人聊天信息或者群组消息
                            if(responsejs.contains("offlinemsg"))
                            {
                                vector<string> vec=responsejs["offlinemsg"];
                                for(string &str:vec)
                                {
                                    json js=json::parse(str);

                                    cout<<js["time"]<<"["<<js["id"]<<"]"<<js["name"]
                                    <<"said"<<js["msg"]<<endl;
                                }
                            }
                            //登陆成功，启动接收线程负责接收数据
                            std::thread readTask(writeTaskHandler,clientfd);
                            readTask.detach();
                            mainMenu();
                        }
                    }
                }
            }
            break;
            case 2://register业务
            {
                char name[50]={0};
                char pwd[50]={0};
                cout<<"usernam:";
                cin.getline(name,50);
                cout<<"userpassword:";
                cin.getline(pwd,50);
                
                json js;
                js["msgid"]=REG_MSG;
                js["name"]=name;
                js["password"]=pwd;
                string request=js.dump();

                int len=send(clientfd,request.c_str(),strlen(request.c_str())+1,0);
                if(len==-1)
                {
                    cerr<<"send reg msg error:"<<request<<endl;
                }
                else
                {
                    char buffer[1024]={0};
                    len=recv(clientfd,buffer,1024,0);
                    if(-1==len)
                    {
                        cerr<<"recv reg response error"<<endl;
                    }
                    else
                    {
                        json responsejs=json::parse(buffer);
                        if(0!=responsejs["errno"].get<int>())//注册失败
                        {
                            cerr<<name<<"is already exist,register error!"<<endl;
                        }
                        else//注册成功
                        {
                            cout<<name<<"register success,userid is "<<responsejs["id"]<<",do not forget it!"<<endl;
                        }
                    }
                }
            }
            break;
            case 3://quit业务
                close(clientfd);
                exit(0);
            default:
                cerr<<"invalid input!"<<endl;
                break;
        }

    }
    return 0;
}

//显示当前登录成功用户的基本信息
void showCurrentUserData()
{
    cout<<"==================login user=================="<<endl;
    cout<<"current login user id:"<<g_currentUser.getId()<<" name:"<<g_currentUser.getName()<<endl;
    cout<<"------------------friend list-----------------"<<endl;
    if(!g_currentUserFriendList.empty())
    {
        for(User &user:g_currentUserFriendList)
        {
            cout<<user.getId()<<" "<<user.getName()<<" "<<user.getState()<<endl;
        }
    }
    cout<<"------------------group list------------------"<<endl;
    if(!g_currentUserGroupList.empty())
    {
        for(Group &group:g_currentUserGroupList)
        {
            cout<<group.getId()<<" "<<group.getName()<<" "<<group.getDesc()<<endl;
            for(GroupUser &user:group.getUsers())
            {
                cout<<user.getId()<<" "<<user.getName()<<" "<<user.getState()<<" "<<user.getRole()<<endl;
            }
        }
    }
    cout<<"=============================================="<<endl;
}

//获取系统时间 （聊天信息需要添加时间信息）
string getCurrentTime()
{
    return "";
}

//主页面程序
void mainMenu()
{

}

//接收线程
void writeTaskHandler(int clientfd)
{

}