我最近在java中启动了一个大型服务器应用程序。
问题是，我的用户更新功能usr.updUser(...)无效。
首先是文件。
Server.java:
import java.net.ServerSocket;
import java.net.Socket;
import java.io.IOException;
import java.io.DataInputStream;
import java.io.DataOutputStream;
public class Server extends Thread {
private ServerSocket srvSock;
SQLdb db;
User usr;
public Server(int port, SQLdb db) throws IOException{
srvSock = new ServerSocket(port);
this.db = db;
}
public void run(){
while(true){
String ret = "";
try{
Socket sock = srvSock.accept();
usr = new User(db);
DataInputStream in = new DataInputStream(sock.getInputStream());
try{
String[] cmd = in.readUTF().split(":");
switch(cmd[0]){
case "user":{
switch(cmd[1]){
case "addUser":{
ret = usr.addUser(cmd[2]);
break;
}
case "getUser":{
ret = usr.getUser(cmd[2]);
break;
}
case "updUser":{
ret = usr.updUser(cmd[2]);
break;
}
case "delUser":{
ret = usr.delUser(cmd[2]);
break;
}
}
break;
}
}
}catch(Exception e){
e.printStackTrace();
}
DataOutputStream out = new DataOutputStream(sock.getOutputStream());
out.writeUTF(ret);
sock.close();
}catch(IOException e){
e.printStackTrace();
break;
}
}
}
public static void main(String[] args){
SQLdb db = new SQLdb("data.db");
User usr = new User(db);
if(args[0] == "new")
usr.setupTable();
usr.updUser("age=6;uid=2"));
try{
Thread server = new Server(5000, db);
server.start();
}catch(IOException e){
e.printStackTrace();
}
Thread ti = new TermInput(db);
ti.start();
Thread time = new Time(usr);
time.start();
}
}
User.java:
import java.sql.SQLException;
public class User {
SQLdb db;
String report;
public User(SQLdb db){
this.db = db;
}
public String setupTable(){
if(
db.addTable("users",
"uid INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, " +
"uname TEXT UNIQUE NOT NULL, " +
"pwd TEXT NOT NULL, " +
"mail TEXT UNIQUE NOT NULL, " +
"age INTEGER NOT NULL, " +
"rank INTEGER DEFAULT 0 , " +
"coins INTEGER DEFAULT 100 , " +
"prem INT DEFAULT 0 , " +
"setg TEXT")
)
report = "ok";
else
report = db.report;
return report;
}
public String addUser(String cmd){
try{
String[] _cmd = cmd.split(";");
if(db.addEntry("users", new String[] {"uname, pwd, mail, age",
"'" + _cmd[0] + "', '" + _cmd[1] + "', '" + _cmd[2] + "', " + _cmd[3]}))
report = "ok";
else
report = db.report;
}catch(Exception e){
report = e.getMessage();
}
return report;
}
public String getUser(String cmd){
try{
String[] _cmd = cmd.split(";");
if(db.getEntry("users", new String[] {_cmd[0], _cmd[1]})){
try{
report = "";
while(db.res.next()){
report += Integer.toString(db.res.getInt("uid")) + ";";
report += db.res.getString("uname") + ";";
report += db.res.getString("pwd") + ";";
report += db.res.getString("mail") + ";";
report += Integer.toString(db.res.getInt("age")) + ";";
report += Integer.toString(db.res.getInt("rank")) + ";";
report += Integer.toString(db.res.getInt("coins")) + ";";
report += Integer.toString(db.res.getInt("prem")) + ";";
report += db.res.getString("setg");
report += "-";
}
db.res.close();
db.stmt.close();
}catch(SQLException e){
report = e.getMessage();
}
}
}catch(Exception e){
report = e.getMessage();
}
return report;
}
public String updUser(String cmd){
try{
String[] _cmd = cmd.split(";");
if(db.updEntry("users", new String[] {_cmd[0], _cmd[1]}))
report = "ok";
else
report = db.report;
}catch(Exception e){
report = e.getMessage();
}
return report;
}
public String delUser(String cmd){
try{
if(db.delEntry("users", cmd))
report = "ok";
else
report = db.report;
}catch(Exception e){
report = e.getMessage();
}
return report;
}
}
SQLdb.java:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class SQLdb {
Connection conn;
Statement stmt;
String report;
ResultSet res;
public SQLdb(String db){
try{
Class.forName("org.sqlite.JDBC");
conn = DriverManager.getConnection("jdbc:sqlite:" + db);
report = "";
}catch(Exception e){
report = e.getMessage();
}
}
public boolean addTable(String table, String struct){
try{
stmt = conn.createStatement();
stmt.executeUpdate("CREATE TABLE " + table + " (" + struct + ");");
stmt.close();
report = "";
return true;
}catch(SQLException e){
report = e.getMessage();
return false;
}
}
public boolean resTable(String table){
try{
stmt = conn.createStatement();
stmt.executeUpdate("DELETE FROM " + table + ";");
stmt.close();
report = "";
return true;
}catch(SQLException e){
report = e.getMessage();
return false;
}
}
public boolean delTable(String table){
try{
stmt = conn.createStatement();
stmt.executeUpdate("DROP TABLE " + table + ";");
stmt.close();
report = "";
return true;
}catch(SQLException e){
report = e.getMessage();
return false;
}
}
public boolean addEntry(String table, String[] entry){
try{
stmt = conn.createStatement();
stmt.executeUpdate("INSERT INTO " + table + "(" + entry[0] + ") VALUES (" + entry[1] + ");");
stmt.close();
report = "";
return true;
}catch(SQLException e){
report = e.getMessage();
return false;
}
}
public boolean getEntry(String table, String[] ident){
try{
stmt = conn.createStatement();
String exec = "SELECT " + ident[0] + " FROM " + table;
if(ident[1].equals("-")){
exec += ";";
}else{
exec += " WHERE (" + ident[1] + ");";
}
res = stmt.executeQuery(exec);
report = "";
return true;
}catch(SQLException e){
report = e.getMessage();
return false;
}
}
public boolean updEntry(String table, String[] data){
try{
stmt = conn.createStatement();
stmt.executeUpdate("UPDATE " + table + " set " + data[1] + " WHERE " + data[0] + ";");
stmt.close();
report = "";
return true;
}catch(SQLException e){
report = e.getMessage();
return false;
}
}
public boolean delEntry(String table, String entry){
try{
stmt = conn.createStatement();
stmt.executeUpdate("DELETE FROM " + table + " WHERE (" + entry + ");");
stmt.close();
report = "";
return true;
}catch(SQLException e){
report = e.getMessage();
return false;
}
}
}
TermInput.java:
import java.util.Scanner;
import java.sql.SQLException;
public class TermInput extends Thread {
Scanner s;
SQLdb sql;
public TermInput(SQLdb sql){
s = new Scanner(System.in);
this.sql = sql;
}
public void run(){
System.out.println("\nUse 'help' to get a list of available commands!\n");
boolean exit = false;
while(true){
System.out.print(">> ");
switch(s.next()){
case "help":
case "h":
case "?":{
System.out.println(
" [h]elp/[?]\tList all commands\n" +
" [s]hutdown\tShutdown the server"
);
break;
}
case "shutdown":
case "s":{
exit = true;
break;
}
case "time":{
System.out.println(Time.currentTime());
break;
}
default:{
System.out.println(
" Unknown command!\n" +
" Use 'help' to get a list of available commands!"
);
break;
}
}
if(exit) break;
}
try{
this.sql.conn.close();
}catch(SQLException e){
e.printStackTrace();
}
System.exit(0);
}
}
Time.java:
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.sql.SQLException;
public class Time extends Thread{
User usr;
public Time(User usr){
this.usr = usr;
}
public void run(){
while(true){
checkTime();
}
}
private void checkTime(){
String ret = "";
ret = usr.getUser("*;-");
String[] prem = ret.split("-");
for(int x = 0; x < prem.length; x++)
System.out.println(prem[x].split(";")[7]);
}
public static int currentTime() {
int d = 0;
SimpleDateFormat s;
Calendar c = Calendar.getInstance();
s = new SimpleDateFormat("DDD");
d = (Integer.parseInt(s.format(c.getTime()))-1)*24*60*60;
s = new SimpleDateFormat("HH");
d += (Integer.parseInt(s.format(c.getTime()))-1)*60*60;
s = new SimpleDateFormat("mm");
d += (Integer.parseInt(s.format(c.getTime()))-1)*60;
s = new SimpleDateFormat("ss");
d += Integer.parseInt(s.format(c.getTime()));
return d;
}
}
您可以在Server.java的第76行看到我想要更改ID为2到6年的用户年龄。
但是当我发出getUser请求时，它没有改变（参见我的无限通话函数）。
那么为什么用户没有通过我的功能更新？