当我调用搜索动物的方法时，我从服务器收到此错误。该 客户端连接到服务器但是一旦我点击了搜索方法，我就会收到以下错误：
CONNECTED. getConnection
ServerConnect, searchAnimal: java.net.SocketException: Socket is not
connected
CONNECTED. getConnection
getConnection是连接数据库和套接字的方法。我不知道如何解决它。求救！
这些是我的声明。我将GUI和Server放在一页代码中：
public class MGLser5 extends JFrame { //declarations
static private JTextArea txtWin = new JTextArea();
private JScrollPane sp = new JScrollPane(txtWin);
private JButton clear = new JButton();
private int port;
Socket soc; //client socket
ServerSocket lstn; //server socket
InputStream in;
DataInputStream inData;
OutputStream out;
DataOutputStream outData;
static String client, username, password, request;
boolean connected;
static String model;
static Connection conn;
static Statement st;
static ResultSet rec;
private void startServer() {
try {
lstn = new ServerSocket(port);
txtWin.append("Listening on port number: " + port + "\n");
soc = lstn.accept();
connected = true;
in = soc.getInputStream();
inData = new DataInputStream(in);
out = soc.getOutputStream();
outData = new DataOutputStream(out);
//client = lstn.accept();
client = inData.readUTF();
txtWin.append("Connection established with " + client + "\n");
while (connected) {
model = "";
request = inData.readUTF();
txtWin.append("Request from client: \t" + request + "\n");
//db/socket disconnect
if ("Exit".equals(request)) {
try {
connected = false;
soc.close();
lstn.close();
in.close();
inData.close();
out.close();
outData.close();
conn.close();
} catch (SQLException ex) {
Logger.getLogger(MGLser5.class.getName()).log(Level.SEVERE, null, ex);
}
} else {
delegate(request);
}
}
} catch (IOException ex) {
txtWin.append("Start Server 2: " + ex.getMessage() + "\n");
}
数据库连接
public static void executeQ(String query) {
try {
connectDb();
st = conn.createStatement();
// Result set returned for a simple query
rec = st.executeQuery(query);
} catch (SQLException ex) {
txtWin.append("executeQ: " + ex.getMessage() + "\n");
}
}
构造
public MGLser5(int portIn) {
super("Mokgele Game Lodge ");
port = portIn;
add("Center", sp);
setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
addWindowListener(exitListener);
setSize(400, 300);
setVisible(true);
startServer();
}
搜索动物方法
try {
String result = "";
while (connected) {
boolean match = Pattern.matches("[a-z]+", search);
if (!match || !"".equalsIgnoreCase(search)) {
connectDb();
java.sql.Statement stmt = conn.createStatement();
String sql1 = "SELECT * FROM Animals WHERE animal_name LIKE '%" + search + "%'";
String sql2 = "SELECT * FROM Species WHERE species_name LIKE '%" + search + "%'";
String sql3 = "SELECT Animal.* FROM Species INNER JOIN Animal ON Species.species_id = Animal.species_id WHERE (Species.species_name)=\'" + search + "\';";
ResultSet rs = stmt.executeQuery(sql1);
while (rs.next()) {
result += "\nAnimal ID: " + rs.getString(1) + "\nAnimal Name: " + rs.getString(2) + "\nInfo: " + rs.getString(3) + "\nSpecies ID: " + rs.getString(4);
result += "\n";
}
//If there's nothing in the Animal table, check the Species table
rs = stmt.executeQuery(sql2);
while (rs.next()) {
result += "\nID: " + rs.getString(1) + "\nSpecies Name: " + rs.getString(2);
result += "\n";
}
//Search for all the records of one classification, like all the felines or rodents
rs = stmt.executeQuery(sql3);
while (rs.next()) {
result += "\nAnimal ID: " + rs.getString(1) + "\nAnimal Name: " + rs.getString(2) + "\nInfo: " + rs.getString(3) + "\nSpecies ID: " + rs.getString(4);
result += "\n";
}
return result;
} else /*Error mssage for wrong search input*/ {
JOptionPane.showMessageDialog(null, "Error.\nPlease ReEnter your search agian");
return "";
}
}
return result;
} catch (SQLException e) {
System.out.println("Server, SearchAnimal: " + e);
connected = false;
return "";
}
// DECLARATIONS
private Socket clientSocket = new Socket();
private DataInputStream Datain;
private InputStream in;
private DataOutputStream Dataout;
private OutputStream out;
static private String server = "127.0.0.1", host;//local host
final int portIn = 8888;//port number
boolean isConnect = true;
public DataInputStream getInData() {
return Datain;
}
public DataOutputStream getOutData() {
return Dataout;
}
//CLIENT CONNECTIONS
public void getConnection() {
try {
//ServerSocket svrSoc = null;
clientSocket = new Socket(server, portIn);
//svrSoc = new ServerSocket(portIn);
//clientSocket = svrSoc.accept();
//Input stream from the server
in = clientSocket.getInputStream();
Datain = new DataInputStream(in);
//Output stream to the server
out = clientSocket.getOutputStream();
Dataout = new DataOutputStream(out);
Dataout.writeUTF(host);
System.out.println("CONNECTED. getConnection");
//closeConnection();
} catch (IOException e) {
System.out.println("ServerConnect, getConnection1: " + e);
//closeConnection();
} catch (NullPointerException e) {
System.out.println("ServerConnect, getConnection2: " + e);
//closeConnection();
}
}
private void getNewConnection(String request) {//send and receive data
try {
in = clientSocket.getInputStream();
Datain = new DataInputStream(in);
out = clientSocket.getOutputStream();
Dataout = new DataOutputStream(out);
host = request;
Dataout.writeUTF(host);
} catch (UnknownHostException ex) {
} catch (IOException ex) {
}
}
//Method to close the connection
public void closeConnection() {
try {
clientSocket.close();
Datain.close();
Dataout.close();
clientSocket.close();
System.out.println("DISCONNECTED .");
} catch (IOException e) {
System.out.println("ServerConnect, closeConnection: " + e);
} catch (NullPointerException e) {
System.out.println("ServerConnect, closeConnection: " + e);
}
}
//服务器中搜索方法的方法
public String searchAnimal(String search) {
String fromServer;
try {
in = clientSocket.getInputStream();
Datain = new DataInputStream(in);
out = clientSocket.getOutputStream();
Dataout = new DataOutputStream(out);
if (isConnect) {
Dataout.writeUTF("searchAnimal");
Dataout.writeUTF(search);
fromServer = Datain.readUTF();
//closeConnection();
return fromServer;
} else {
System.out.println("ERROR SEARCH ANIMAL NOT FUNCTIONING ");
}
//closeConnection();
return "";
} catch (IOException e) {
System.out.println("ServerConnect, searchAnimal: " + e);
//closeConnection();
return "";
} catch (NullPointerException e) {
System.out.println("ServerConnect, searchAnimal: " + e);
//closeConnection();
return "";
}
}
答案 0 :(得分：0)
@Override
public int compare(T o1, T o2) {
return o2.compareTo(o1);
}
问题出在这里。您正在创建一个没有连接的套接字，这是毫无意义的，然后永远不会连接它。