聊天室服务端
前言
这是我用java写的Android聊天室项目的服务端，当然也可用于java项目。这里写了两个服务端，一个只实现多人聊天，一个可多人，可一对一。
Android客户端
源码
-
服务端1(多人聊天)
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.HashMap;
public class Run2 {
private final static int PORT = 12345; //自定义端口号
public static ArrayList<Socket> list ;
public static void main(String[] args) throws IOException {
//重开一条线程启动服务器
new Thread(new startServer()).start();
}
static class startServer implements Runnable{
@Override
public void run() {
try {
ServerSocket server = new ServerSocket(PORT);
list = new ArrayList<>();
while (true) {
Socket client = server.accept();
System.out.println(client);
//只要有人连接上就把对应的Socket就存入List集合中
list.add(client);
//再开一条线程用来传输数据
//调用构造器，第一个参数是当前的Socket,根据他去获取用户传入的数据
//第二个参数是List集合，通过他去给每个连接上的发送数据
new choicesend2(client,list).start();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
class choicesend2 extends Thread {
private Socket socket;
private DataOutputStream dos;
private DataInputStream dis;
public ArrayList<Socket> list;
public choicesend2(Socket socket, ArrayList<Socket> list) {
this.socket = socket;
this.list = list;
}
@Override
public void run() {
try {
//
dis = new DataInputStream(socket.getInputStream());
//这里一定要无限循环，不然只能接收一次消息
while (true) {//使服务器无限循环
//这些都是用来接收用户传来的数据的，可自行更改
String title;
String name;
String ip;
char[] temp = new char[200];
int len = 0;
char c = 0;
while ((c = dis.readChar()) != '\t') {
temp[len] = c;
len++;
}
title = new String(temp, 0, len);
len = 0;
while ((c = dis.readChar()) != '\t') {
temp[len] = c;
len++;
}
name = new String(temp, 0, len);
len = 0;
while ((c = dis.readChar()) != '\t') {
temp[len] = c;
len++;
}
ip = new String(temp, 0, len);
System.out.println(ip);
//遍历集合，拿出每一个连接的Socket,向他们发送数据
for (Socket socket : list) {
if(socket==this.socket) //如果是自己就不发
continue;
// 让dos关联每一个Socket，吧数据传出
dos = new DataOutputStream(socket.getOutputStream());
try {
dos.writeChars(title);
dos.writeChar('\t');
dos.writeChars(name);
dos.writeChar('\t');
dos.writeInt(0);
dos.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}catch (IOException e) {
e.printStackTrace();
}
}
}
-
服务端2(多人聊天+一对一)
问题：我们在多人聊天时是用ArrayList集合来存放每一个连接上的Socket对象,但是显然我们自己无法判断出那个是我要去传输数据的Socket
解决方案:把ArrayList改为HashMap,键存放识别用户的信息，值存放Socket，发送时根据键判断是否要与此时的Socket建立连接
比如我的键传的ip，根据ip判断是否建立连接（显然这种不能在一台电脑上相互传输，（HashMap无重复））
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.HashMap;
public class Run {
private final static int PORT = 12345;
public static ArrayList<Socket> list ;
public static HashMap<String,Socket> hs;
public static void main(String[] args) throws IOException {
new Thread(new startServer()).start();
}
static class startServer implements Runnable{
@Override
public void run() {
try {
ServerSocket server = new ServerSocket(PORT);
hs = new HashMap<>();
while (true) {
Socket client = server.accept();
System.out.println(client);
hs.put(client.getInetAddress().toString(),client);
new choicesend(client,hs).start();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
class choicesend extends Thread {
private Socket socket;
private String key;
private DataOutputStream dos;
private DataInputStream dis;
public HashMap<String,Socket> hs;
public choicesend(Socket socket, HashMap<String,Socket> hs) {
this.socket = socket;
this.hs = hs;
}
@Override
public void run() {
try {
dis = new DataInputStream(socket.getInputStream());
while (true) {//使服务器无限循环
String title;
String name;
//这里是我传入的ip,与HashMap进行匹配
String ip;
char[] temp = new char[200];
int len = 0;
char c = 0;
while ((c = dis.readChar()) != '\t') {
temp[len] = c;
len++;
}
title = new String(temp, 0, len);
len = 0;
while ((c = dis.readChar()) != '\t') {
temp[len] = c;
len++;
}
name = new String(temp, 0, len);
len = 0;
while ((c = dis.readChar()) != '\t') {
temp[len] = c;
len++;
}
ip = new String(temp, 0, len);
System.out.println(ip);
//如果传入的是255.255.255.255说明是群发
if(ip.equals("255.255.255.255")){
for(String sendip : hs.keySet()){
System.out.println(sendip+"集合中的ip");
Socket socket = hs.get(sendip);
dos = new DataOutputStream(socket.getOutputStream());
try {
// System.out.println("我发了");
dos.writeChars(title);
dos.writeChar('\t');
dos.writeChars(name);
dos.writeChar('\t');
dos.writeInt(0);
dos.flush();
} catch (IOException e) {
//list.remove(socket);
e.printStackTrace();
}
}
}
//否则用传入的ip与HashMap的键匹配
else{
for(String sendip : hs.keySet()){
// System.out.println(sendip+"集合中的ip");
//刚才通过client.getInetAddress().toString()获取的ip开头是“/”,所以去掉第一位
sendip = sendip.substring(1,sendip.length());
//如果匹配上拿到对应的Socket对象
if(ip.equals(sendip)){
Socket socket = hs.get(sendip);
if(socket!=null)
dos = new DataOutputStream(socket.getOutputStream());
try {
System.out.println("我发了");
dos.writeChars(title);
dos.writeChar('\t');
dos.writeChars(name);
dos.writeChar('\t');
dos.writeInt(1);
dos.flush();
} catch (IOException e) {
// list.remove(socket);
e.printStackTrace();
}
}
}
}
}
}catch (IOException e) {
e.printStackTrace();
}
}
}