我的Java程序存在问题。它由客户端和服务器类组成。服务器只从客户端读取字符而不是字符串。哪里出错了？ 这是我的计划。
Client.java
public class Client_1324600 {
private static String text;
private static char character;
private static int numOfOccurrences;
public static void main(String args[]) throws IOException, Exception { // Main Method
Socket clientSocket = new Socket("localhost", 6787); // socket to establish a connection with the server
Scanner sc = new Scanner(System.in);
BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in)); // read from user
DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream()); // send to server
BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); // read from server
do {
System.out.print("Enter a Character to be searched: ");
character = inFromUser.readLine().charAt(0); // read a char
outToServer.writeByte(character); // send character to server
System.out.print("Enter a String: ");
text = inFromUser.readLine(); // read string
outToServer.writeBytes(text+'\n'); // sent the text to server
numOfOccurrences = inFromServer.read(); // read number of Occurrences
System.out.print("The number of Occurrences are: " + numOfOccurrences);
System.out.println("Want to repeat (Y/N): "); // ask user to repeat
char option = sc.next().charAt(0);
switch (option) {
case 'y': // option = Y or y if he wants to repeat
case 'Y':
break;
case 'n': // option = N or n if he does not want to repeat
case 'N':
System.out.println("Thank You!");
clientSocket.close(); // close the connection
System.exit(0);
default: // he enters a wrong option
System.out.print("Error, Please enter either Y or N\n");
System.out.println("Want to repeat (Y/N): ");
option = sc.next().charAt(0);
break;
} // switch
} while (true);
} // main
} // end class client
Server.java
public class Server_1324600 {
public static void main(String[] args) throws IOException {
String clientSentence;
char clientChar;
int numOfOccurrences;
ServerSocket welcomeSocket = new ServerSocket(6787); // socket to connect with client
System.out.println("Waiting for a client's request for connection ...");
//waiting for client's request to establish the connection
Socket connectionSocket = welcomeSocket.accept();
System.out.println("connection established!");
while (true) {
BufferedReader inFromClient
= new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
DataOutputStream outToClient
= new DataOutputStream(connectionSocket.getOutputStream());
clientChar = inFromClient.readLine().charAt(0); // read char from client
System.out.println("clientChar " + clientChar);
clientSentence = inFromClient.readLine(); // read text from client
System.out.println("clientSentence " + clientSentence+'\n');
numOfOccurrences = CountChars(clientChar, clientSentence); // call method CountChars and store return value in numOfOccurrences
outToClient.writeInt(numOfOccurrences + '\n'); // send numOfOccurrences to client
}
}
static int CountChars(char character, String text) { // method CountChars to count the number of characters in a given text
int count = 0;
/*Since the text may contain lower-case and upper-case characters,
my idea is to change the text as well as the character to lower-case, the search for matching characters */
text = text.toLowerCase(); // convert the string to lower-case
character = Character.toLowerCase(character); // convert the character to lower-case
for (int i = 0; i < text.length(); i++) { // traverse the String character by character
if (text.charAt(i) == character) { // if the message character matches with the user character
count++; // increment counter by one
} // if
} // for
return count; // return The number of Occurrences
} //CountChars
} // end class server
输出：
Enter a Character to be searched: a
Enter a String: thank you