所以基本上我有一个简单的echo服务器客户端。我想要做的是运行服务器然后运行客户端，一旦客户端运行它应该运行其中的方法。但是，只有第一个方法searchForSkill运行，在此之后没有其他任何事情可以解释为什么会发生这种情况或如何确保实际运行的下一个方法？我有一个开发人员数据库类，它使用构造函数来创建服务器类中保存的对象。非常感谢任何帮助。
服务器类：
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
public class Server {
static List<DeveloperDatabase> list = new ArrayList<DeveloperDatabase>(){
{
add(new DeveloperDatabase(1,"David Ferguson", "Java", true));
add(new DeveloperDatabase(2,"Grant Thompson", "Java", true));
add(new DeveloperDatabase(3,"Craig Jackson", "C++", true));
add(new DeveloperDatabase(4,"Kevin James","C++", true));
add(new DeveloperDatabase(5,"Greg Troupe", "Python", true));
add(new DeveloperDatabase(6,"James Smith", "Python", true));
add(new DeveloperDatabase(7,"Jamie Richie", "PHP", true));
add(new DeveloperDatabase(8,"Rory McGrattan", "PHP", false));
}
};
public static String printJava(){
String message="";
for (int i=0;i<2;i++){
message +=list.get(i).toString();
message+=" \n";
}
return message;
}
public static String printC(){
String message="";
for (int i=2;i<4;i++){
message +=list.get(i).toString();
message+=" \n";
}
return message;
}
public static String printPy(){
String message="";
for (int i=4;i<6;i++){
message +=list.get(i).toString();
message+=" \n";
}
return message;
}
public static String printPHP(){
String message="";
for (int i=6;i<8;i++){
message +=list.get(i).toString();
message+=" \n";
}
return message;
}
// Main
public static void main(String[] args) {
ServerSocket listenSocket;
Socket s;
PrintWriter toClient = null;
Scanner fromClient = null;
int port; // holds port server will listen on
String userInput; // holds a line typed by the user
System.out.print("Server - port to listen on: ");
//port = stdIn.nextInt(); // get port number from user
port = 4444; // get port number from user
System.out.println(port);
try {
listenSocket = new ServerSocket(port);
System.out.println("Waiting for client...");
s = listenSocket.accept();
toClient = new PrintWriter(s.getOutputStream(), true);
fromClient = new Scanner(s.getInputStream());
int inputLine;
do {
inputLine = fromClient.nextInt();
switch (inputLine) {
case 1: // get skills
{
System.out.println("GET skill");
fromClient.nextLine();
String quoteNum = fromClient.nextLine();//receive from client
if (quoteNum.equalsIgnoreCase("Java")) {
toClient.println(printJava());
} else if (quoteNum.equalsIgnoreCase("C++")) {
toClient.println(printC());
} else if (quoteNum.equalsIgnoreCase("Python")) {
toClient.println(printPy());
} else if (quoteNum.equalsIgnoreCase("PHP")) {
toClient.println(printPHP());
}
else {
toClient.println("No developer with those skills found");
}
// toClient.println(list.equals("Java"));//number -1 for array (0) to client print
System.out.println("Pushed Developer number: " + quoteNum + " to client at " + s.getInetAddress());
//toClient.println(quotes[quoteNum]); // return quote //if "java' { get(0) get(1)
break;
}
case 2: // add quote
{
System.out.println("ADD Developer to System");
fromClient.nextLine(); // flush newline
String quote = fromClient.next();
fromClient.nextLine();
String quote1 = fromClient.next();
fromClient.nextLine();
boolean quote2 = fromClient.nextBoolean();
toClient.println("The\t*************Developer has been Added to the Developer Database********");
list.add(new DeveloperDatabase(9, quote, quote1, quote2));
toClient.println(list.get(8).toString());
//addDeveloper(quote,quote1,quote2);
System.out.println(list.get(8));
//System.out.println("Received quote from client:" + quote);
quote = quote + "\n\n";
//list.add((quote);
System.out.println("Added Developer: " + quote);
break;
}
case 3: // Check if Developer is available
{
System.out.println("Check if developer is Available\n");
fromClient.nextLine();
String quoteNum = fromClient.nextLine();
System.out.println("Checking availability for: " + quoteNum);
if (quoteNum.equalsIgnoreCase("Rory McGrattan")) {
toClient.println("The Developer is not available for hire");
} else {
toClient.println("The Developer is available for hire");
}break;
}case 4: {
System.out.println("Hire A Developer");
String quoteNum =fromClient.next();
System.out.println("Client wants to hire: "+quoteNum);
String message = quoteNum;
for(int i=0;i<list.size();i++){
if (quoteNum.equalsIgnoreCase(list.get(i).getDeveloperName())){
list.get(i).hireDeveloper();
}//if
}//if
//System.out.println(message);
toClient.println("******* You have Hired: "+ message+" ********");
break;
}
case 5: {// Print all Developers
String message="";
for (int i=0;i<8;i++){
message +=list.get(i).toString();
message+=" \n";
}
toClient.println(message);
}
default:
break;
}
} while (fromClient.hasNextLine());
// Close all streams
System.out.println("Closing Server...");
toClient.close();
fromClient.close();
s.close();
} catch (Exception e) {
System.out.println("Exception: " + e);
System.exit(1);
}
} // run
} // Server
客户端类：
import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.NoSuchElementException;
import java.util.Scanner;
public class Client {
static Scanner stdIn = new Scanner(System.in);
static PrintWriter toServer = null; // output stream to remote host
static Scanner fromServer = null; // input stream from remote host
static String reply;// holds reply from remote host
public static void doTasks(){
searchForSkill("PHP");
addDeveloper("David Blaine", "Java", true);
checkAvailability("David Ferguson");
hireDeveloper("Thompson");
printAllDevelopers();
}
private static void searchForSkill(String skill) {
toServer.println(1);
String quoteNum = "php"; //Search for a specific coding language - Specific to the entered parameters
System.out.println("Searching for Skill: " + skill + " in Developer Database");
toServer.println(quoteNum);
while (!(reply = fromServer.nextLine()).isEmpty()) {
// System.out.println(reply1);
System.out.println(reply);// print reply to screen
}
fromServer.nextLine(); // Consume the newline
System.out.println();
}
public static void addDeveloper(String name, String skill,boolean hire) {
toServer.println(2);
System.out.println("Add Developer to system ");
stdIn.nextLine(); // flush newline
String quoteString = name;//stdIn.nextLine();
String quoteString1 = skill;//stdIn.nextLine();
boolean quoteString2 = hire;//stdIn.nextLine();
toServer.println(quoteString);
toServer.println(quoteString1);
toServer.println(quoteString2);
fromServer.next();
System.out.println("\nDeveloper entered: " + quoteString + "\n");
while (!(reply = fromServer.nextLine()).isEmpty()) {
// System.out.println(reply1);
System.out.println(reply);// print reply to screen
}
}
public static void checkAvailability(String developerName) {
try {
toServer.println(3);
System.out.println("Send Developer Name to Find Availability: ");
String quoteDel = developerName;
toServer.println(quoteDel);
while (!(reply = fromServer.nextLine()).isEmpty()) {
// System.out.println(reply1);
System.out.println(reply);// print reply to screen
}
} catch (NoSuchElementException e) {
}
}
public static void hireDeveloper(String name) {
toServer.println(4);
String quoteNum = name; //Search for a specific coding language - Specific to the entered parameters
System.out.println("Searching for: " + name + " in Developer Database");
toServer.println(quoteNum);
while (!(reply = fromServer.nextLine()).isEmpty()) {
// System.out.println(reply1);
System.out.println(reply);// print reply to screen
}
fromServer.nextLine(); // Consume the newline
System.out.println();
}
public static void printAllDevelopers(){
toServer.println(5);
while (!(reply = fromServer.nextLine()).isEmpty()) {
// System.out.println(reply1);
System.out.println(reply);// print reply to screen
}
fromServer.nextLine(); // Consume the newline
System.out.println();
}
public static void main(String[] args) throws IOException {
Socket serverSocket = null; // holds the Socket object
String remoteServer = "localhost"; // remote host is 'local'!
int port;
try {
System.out.print("Server port: ");
//port = stdIn.nextInt(); // get port number from user
port = 4444; // get port number from user
System.out.print(port);
System.out.println("\n");
// Try to connect to remote host machine on port xxxx
serverSocket = new Socket(remoteServer, port);
// Set up the input/output streams to the remote host
toServer = new PrintWriter(serverSocket.getOutputStream(), true);
// Convert the socket's input stream to a 'Scanner'
// to allow 'nextLine' operations to be performed
fromServer = new Scanner(serverSocket.getInputStream());
} catch (Exception e) {
System.err.println("Exception: " + e);
System.exit(1);
} // try-catch
String userInput; // holds a line typed by the user
String name; // to store name
String number; // to store phone number
do {
userInput = "c";
searchForSkill("PHP");
addDeveloper("David Blaine","Java",true);
checkAvailability("Jamie Richie");
hireDeveloper("Jamie Richie");
printAllDevelopers();
//stdIn.nextLine(); // get command from user
} while (!userInput.equalsIgnoreCase("x"));
toServer.println(userInput);
// Close all streams
toServer.close();
fromServer.close();
stdIn.close();
serverSocket.close();
} // main
} // Client
开发人员数据库类：
/**
* Created by ${Grant} on ${28/09/2017}
* COMMENTS ABOUT PROGRAM HERE
*/
public class DeveloperDatabase {
private int id;
private String developerName;
private String codingLanguage;
private boolean freeForHire;
public DeveloperDatabase(){
}
public DeveloperDatabase(int id,String name,String codeSkills,boolean hire){
this.id = id;
this.developerName = name;
this.codingLanguage=codeSkills;
this.freeForHire=hire;
}
public String toString() {
String message = "\tName: " +developerName;
message += "\n" + "\tCoding Language: "+ codingLanguage+"\n";
if (freeForHire== true) {
message += "\tThe developer is Available! for Hire!\n";
} else {
message += "\tThe developer is not Available for Hire!\n";
}
return message;
}//toString
public boolean getFreeForHire() {
if (freeForHire==true){
System.out.println("The Developer is free to hire!");
}else{
System.out.println("The Developer is not free to hire!");
}
return freeForHire;
}
public String getCodingLanguage() {
return codingLanguage;
}
public void hireDeveloper(){
if (freeForHire==true)
freeForHire = false;
System.out.println(developerName +" is Hired!");
}
public String getDeveloperName() {
return developerName;
}
public static void main(String[] args) {
}//main
}//class
答案 0 :(得分：0)
while (!(reply = fromServer.nextLine()).isEmpty()) {
// System.out.println(reply1);
System.out.println(reply);// print reply to screen
}
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