就是一個(gè)條件判斷啊
創(chuàng)新互聯(lián)公司是一家集網(wǎng)站建設(shè),臨清企業(yè)網(wǎng)站建設(shè),臨清品牌網(wǎng)站建設(shè),網(wǎng)站定制,臨清網(wǎng)站建設(shè)報(bào)價(jià),網(wǎng)絡(luò)營(yíng)銷,網(wǎng)絡(luò)優(yōu)化,臨清網(wǎng)站推廣為一體的創(chuàng)新建站企業(yè)，幫助傳統(tǒng)企業(yè)提升企業(yè)形象加強(qiáng)企業(yè)競(jìng)爭(zhēng)力?？沙浞譂M足這一群體相比中小企業(yè)更為豐富、高端、多元的互聯(lián)網(wǎng)需求。同時(shí)我們時(shí)刻保持專業(yè)、時(shí)尚、前沿，時(shí)刻以成就客戶成長(zhǎng)自我，堅(jiān)持不斷學(xué)習(xí)、思考、沉淀、凈化自己，讓我們?yōu)楦嗟钠髽I(yè)打造出實(shí)用型網(wǎng)站。
在循環(huán)里面，讀入用戶輸入，判斷是否是定義中的字符串（string.equal()函數(shù)）
然后，如果是的話，就輸出對(duì)應(yīng)的string，如果不是，就輸出那個(gè)對(duì)不起的string，然后如果是再見，就再見唄
是這樣的錯(cuò)誤么？
Frist.java:5: cannot resolve symbol
symbol : class Scanner
location: class Frist
Scanner input=new Scanner(System.in);
Scanner是JDK1.5開始才有的
這樣的錯(cuò)誤是因?yàn)镴DK版本不夠，不支持。。。
我用的就是1.4.2 所以是這樣的錯(cuò)誤
【ClientSocketDemo.java 客戶端Java源代碼】
import java點(diǎn)虐 .*;
import java.io.*;
public class ClientSocketDemo
{
//聲明客戶端Socket對(duì)象socket
Socket socket = null;
//聲明客戶器端數(shù)據(jù)輸入輸出流
DataInputStream in;
DataOutputStream out;
//聲明字符串?dāng)?shù)組對(duì)象response，用于存儲(chǔ)從服務(wù)器接收到的信息
String response[];
//執(zhí)行過程中，沒有參數(shù)時(shí)的構(gòu)造方法，本地服務(wù)器在本地，取默認(rèn)端口10745
public ClientSocketDemo()
{
try
{
//創(chuàng)建客戶端socket，服務(wù)器地址取本地，端口號(hào)為10745
socket = new Socket("localhost",10745);
//創(chuàng)建客戶端數(shù)據(jù)輸入輸出流，用于對(duì)服務(wù)器端發(fā)送或接收數(shù)據(jù)
in = new DataInputStream(socket.getInputStream());
out = new DataOutputStream(socket.getOutputStream());
//獲取客戶端地址及端口號(hào)
String ip = String.valueOf(socket.getLocalAddress());
String port = String.valueOf(socket.getLocalPort());
//向服務(wù)器發(fā)送數(shù)據(jù)
out.writeUTF("Hello Server.This connection is from client.");
out.writeUTF(ip);
out.writeUTF(port);
//從服務(wù)器接收數(shù)據(jù)
response = new String[3];
for (int i = 0; i response.length; i++)
{
response[i] = in.readUTF();
System.out.println(response[i]);
}
}
catch(UnknownHostException e){e.printStackTrace();}
catch(IOException e){e.printStackTrace();}
}
//執(zhí)行過程中，有一個(gè)參數(shù)時(shí)的構(gòu)造方法，參數(shù)指定服務(wù)器地址，取默認(rèn)端口10745
public ClientSocketDemo(String hostname)
{
try
{
//創(chuàng)建客戶端socket，hostname參數(shù)指定服務(wù)器地址，端口號(hào)為10745
socket = new Socket(hostname,10745);
in = new DataInputStream(socket.getInputStream());
out = new DataOutputStream(socket.getOutputStream());
String ip = String.valueOf(socket.getLocalAddress());
String port = String.valueOf(socket.getLocalPort());
out.writeUTF("Hello Server.This connection is from client.");
out.writeUTF(ip);
out.writeUTF(port);
response = new String[3];
for (int i = 0; i response.length; i++)
{
response[i] = in.readUTF();
System.out.println(response[i]);
}
}
catch(UnknownHostException e){e.printStackTrace();}
catch(IOException e){e.printStackTrace();}
}
//執(zhí)行過程中，有兩個(gè)個(gè)參數(shù)時(shí)的構(gòu)造方法，第一個(gè)參數(shù)hostname指定服務(wù)器地址
//第一個(gè)參數(shù)serverPort指定服務(wù)器端口號(hào)
public ClientSocketDemo(String hostname,String serverPort)
{
try
{
socket = new Socket(hostname,Integer.parseInt(serverPort));
in = new DataInputStream(socket.getInputStream());
out = new DataOutputStream(socket.getOutputStream());
String ip = String.valueOf(socket.getLocalAddress());
String port = String.valueOf(socket.getLocalPort());
out.writeUTF("Hello Server.This connection is from client.");
out.writeUTF(ip);
out.writeUTF(port);
response = new String[3];
for (int i = 0; i response.length; i++)
{
response[i] = in.readUTF();
System.out.println(response[i]);
}
}
catch(UnknownHostException e){e.printStackTrace();}
catch(IOException e){e.printStackTrace();}
}
public static void main(String[] args)
{
String comd[] = args;
if(comd.length == 0)
{
System.out.println("Use localhost(127.0.0.1) and default port");
ClientSocketDemo demo = new ClientSocketDemo();
}
else if(comd.length == 1)
{
System.out.println("Use default port");
ClientSocketDemo demo = new ClientSocketDemo(args[0]);
}
else if(comd.length == 2)
{
System.out.println("Hostname and port are named by user");
ClientSocketDemo demo = new ClientSocketDemo(args[0],args[1]);
}
else System.out.println("ERROR");
}
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
【ServerSocketDemo.java 服務(wù)器端Java源代碼】
import java點(diǎn)虐 .*;
import java.io.*;
public class ServerSocketDemo
{
//聲明ServerSocket類對(duì)象
ServerSocket serverSocket;
//聲明并初始化服務(wù)器端監(jiān)聽端口號(hào)常量
public static final int PORT = 10745;
//聲明服務(wù)器端數(shù)據(jù)輸入輸出流
DataInputStream in;
DataOutputStream out;
//聲明InetAddress類對(duì)象ip，用于獲取服務(wù)器地址及端口號(hào)等信息
InetAddress ip = null;
//聲明字符串?dāng)?shù)組對(duì)象request，用于存儲(chǔ)從客戶端發(fā)送來的信息
String request[];
public ServerSocketDemo()
{
request = new String[3]; //初始化字符串?dāng)?shù)組
try
{
//獲取本地服務(wù)器地址信息
ip = InetAddress.getLocalHost();
//以PORT為服務(wù)端口號(hào)，創(chuàng)建serverSocket對(duì)象以監(jiān)聽該端口上的連接
serverSocket = new ServerSocket(PORT);
//創(chuàng)建Socket類的對(duì)象socket，用于保存連接到服務(wù)器的客戶端socket對(duì)象
Socket socket = serverSocket.accept();
System.out.println("This is server:"+String.valueOf(ip)+PORT);
//創(chuàng)建服務(wù)器端數(shù)據(jù)輸入輸出流，用于對(duì)客戶端接收或發(fā)送數(shù)據(jù)
in = new DataInputStream(socket.getInputStream());
out = new DataOutputStream(socket.getOutputStream());
//接收客戶端發(fā)送來的數(shù)據(jù)信息，并顯示
request[0] = in.readUTF();
request[1] = in.readUTF();
request[2] = in.readUTF();
System.out.println("Received messages form client is:");
System.out.println(request[0]);
System.out.println(request[1]);
System.out.println(request[2]);
//向客戶端發(fā)送數(shù)據(jù)
out.writeUTF("Hello client!");
out.writeUTF("Your ip is:"+request[1]);
out.writeUTF("Your port is:"+request[2]);
}
catch(IOException e){e.printStackTrace();}
}
public static void main(String[] args)
{
ServerSocketDemo demo = new ServerSocketDemo();
}
}
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