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dbh0512:
楼主怎么解决的 我也遇到同样问题
JS传递数组自动以分号分隔 -
body77:
getTablesCount 这个方法没有?
1天奋战,Jacob解析word -
linchangsheng:
将空格转换为\n就行了
关于textarea的innerHTML和value换行问题 -
topbox163:
怎么没有看到下图?
JS传递数组自动以分号分隔 -
w2gavin:
... 为了验证一个null和""的区别, ...
对于Java的null和""及ArrayList的理解
/*
* Copyright (c) 1998 by Gefion software.
*
* Permission to use, copy, and distribute this software for
* NON-COMMERCIAL purposes and without fee is hereby granted
* provided that this copyright notice appears in all copies.
*
*/
package com.hanet.db;
import java.io.*;
import java.sql.*;
import java.util.*;
import java.util.Date;
/**
* This class is a Singleton that provides access to one or many
* connection pools defined in a Property file. A client gets
* access to the single instance through the static getInstance()
* method and can then check-out and check-in connections from a pool.
* When the client shuts down it should call the release() method
* to close all open connections and do other clean up.
*/
public class DBConnectionManager {
static private DBConnectionManager instance; // The single instance
static private int clients;
private Vector drivers = new Vector();
private PrintWriter log;
private Hashtable pools = new Hashtable();
/**
* Returns the single instance, creating one if it's the
* first time this method is called.
*
* @return DBConnectionManager The single instance.
*/
static synchronized public DBConnectionManager getInstance() {
if (instance == null) {
instance = new DBConnectionManager();
}
clients++;
return instance;
}
/**
* A private constructor since this is a Singleton
*/
private DBConnectionManager() {
init();
}
/**
* Returns a connection to the named pool.
*
* @param name The pool name as defined in the properties file
* @param con The Connection
*/
public void freeConnection(String name, Connection con) {
DBConnectionPool pool = (DBConnectionPool) pools.get(name);
if (pool != null) {
pool.freeConnection(con);
}
}
/**
* Returns an open connection. If no one is available, and the max
* number of connections has not been reached, a new connection is
* created.
*
* @param name The pool name as defined in the properties file
* @return Connection The connection or null
*/
public Connection getConnection(String name) {
DBConnectionPool pool = (DBConnectionPool) pools.get(name);
if (pool != null) {
return pool.getConnection();
}
return null;
}
/**
* Returns an open connection. If no one is available, and the max
* number of connections has not been reached, a new connection is
* created. If the max number has been reached, waits until one
* is available or the specified time has elapsed.
*
* @param name The pool name as defined in the properties file
* @param time The number of milliseconds to wait
* @return Connection The connection or null
*/
public Connection getConnection(String name, long time) {
DBConnectionPool pool = (DBConnectionPool) pools.get(name);
if (pool != null) {
return pool.getConnection(time);
}
return null;
}
/**
* Closes all open connections and deregisters all drivers.
*/
public synchronized void release() {
// Wait until called by the last client
if (--clients != 0) {
return;
}
Enumeration allPools = pools.elements();
while (allPools.hasMoreElements()) {
DBConnectionPool pool = (DBConnectionPool) allPools.nextElement();
pool.release();
}
Enumeration allDrivers = drivers.elements();
while (allDrivers.hasMoreElements()) {
Driver driver = (Driver) allDrivers.nextElement();
try {
DriverManager.deregisterDriver(driver);
log("Deregistered JDBC driver " + driver.getClass().getName());
}
catch (SQLException e) {
log(e, "Can't deregister JDBC driver: " + driver.getClass().getName());
}
}
}
/**
* Creates instances of DBConnectionPool based on the properties.
* A DBConnectionPool can be defined with the following properties:
* <PRE>
* <poolname>.url The JDBC URL for the database
* <poolname>.user A database user (optional)
* <poolname>.password A database user password (if user specified)
* <poolname>.maxconn The maximal number of connections (optional)
* </PRE>
*
* @param props The connection pool properties
*/
private void createPools(Properties props) {
Enumeration propNames = props.propertyNames();
while (propNames.hasMoreElements()) {
String name = (String) propNames.nextElement();
if (name.endsWith(".url")) {
String poolName = name.substring(0, name.lastIndexOf("."));
String url = props.getProperty(poolName + ".url");
if (url == null) {
log("No URL specified for " + poolName);
continue;
}
String user = props.getProperty(poolName + ".user");
String password = props.getProperty(poolName + ".password");
String maxconn = props.getProperty(poolName + ".maxconn", "0");
int max;
try {
max = Integer.valueOf(maxconn).intValue();
}
catch (NumberFormatException e) {
log("Invalid maxconn value " + maxconn + " for " + poolName);
max = 0;
}
DBConnectionPool pool =
new DBConnectionPool(poolName, url, user, password, max);
pools.put(poolName, pool);
log("Initialized pool " + poolName);
}
}
}
/**
* Loads properties and initializes the instance with its values.
*/
private void init() {
InputStream is = getClass().getResourceAsStream("/db.properties");
Properties dbProps = new Properties();
try {
dbProps.load(is);
}
catch (Exception e) {
System.err.println("Can't read the properties file. " +
"Make sure db.properties is in the CLASSPATH");
return;
}
String logFile = dbProps.getProperty("logfile", "DBConnectionManager.log");
try {
log = new PrintWriter(new FileWriter(logFile, true), true);
}
catch (IOException e) {
System.err.println("Can't open the log file: " + logFile);
log = new PrintWriter(System.err);
}
loadDrivers(dbProps);
createPools(dbProps);
}
/**
* Loads and registers all JDBC drivers. This is done by the
* DBConnectionManager, as opposed to the DBConnectionPool,
* since many pools may share the same driver.
*
* @param props The connection pool properties
*/
private void loadDrivers(Properties props) {
String driverClasses = props.getProperty("drivers");
StringTokenizer st = new StringTokenizer(driverClasses);
while (st.hasMoreElements()) {
String driverClassName = st.nextToken().trim();
try {
Driver driver = (Driver)
Class.forName(driverClassName).newInstance();
DriverManager.registerDriver(driver);
drivers.addElement(driver);
log("Registered JDBC driver " + driverClassName);
}
catch (Exception e) {
log("Can't register JDBC driver: " +
driverClassName + ", Exception: " + e);
}
}
}
/**
* Writes a message to the log file.
*/
private void log(String msg) {
log.println(new Date() + ": " + msg);
}
/**
* Writes a message with an Exception to the log file.
*/
private void log(Throwable e, String msg) {
log.println(new Date() + ": " + msg);
e.printStackTrace(log);
}
/**
* This inner class represents a connection pool. It creates new
* connections on demand, up to a max number if specified.
* It also makes sure a connection is still open before it is
* returned to a client.
*/
class DBConnectionPool {
private int checkedOut;
private Vector freeConnections = new Vector();
private int maxConn;
private String name;
private String password;
private String URL;
private String user;
/**
* Creates new connection pool.
*
* @param name The pool name
* @param URL The JDBC URL for the database
* @param user The database user, or null
* @param password The database user password, or null
* @param maxConn The maximal number of connections, or 0
* for no limit
*/
public DBConnectionPool(String name, String URL, String user, String password,
int maxConn) {
this.name = name;
this.URL = URL;
this.user = user;
this.password = password;
this.maxConn = maxConn;
}
/**
* Checks in a connection to the pool. Notify other Threads that
* may be waiting for a connection.
*
* @param con The connection to check in
*/
public synchronized void freeConnection(Connection con) {
// Put the connection at the end of the Vector
freeConnections.addElement(con);
checkedOut--;
notifyAll();
}
/**
* Checks out a connection from the pool. If no free connection
* is available, a new connection is created unless the max
* number of connections has been reached. If a free connection
* has been closed by the database, it's removed from the pool
* and this method is called again recursively.
*/
public synchronized Connection getConnection() {
Connection con = null;
if (freeConnections.size() > 0) {
// Pick the first Connection in the Vector
// to get round-robin usage
con = (Connection) freeConnections.firstElement();
freeConnections.removeElementAt(0);
try {
if (con.isClosed()) {
log("Removed bad connection from " + name);
// Try again recursively
con = getConnection();
}
}
catch (SQLException e) {
log("Removed bad connection from " + name);
// Try again recursively
con = getConnection();
}
}
else if (maxConn == 0 || checkedOut < maxConn) {
con = newConnection();
}
if (con != null) {
checkedOut++;
}
return con;
}
/**
* Checks out a connection from the pool. If no free connection
* is available, a new connection is created unless the max
* number of connections has been reached. If a free connection
* has been closed by the database, it's removed from the pool
* and this method is called again recursively.
* <P>
* If no connection is available and the max number has been
* reached, this method waits the specified time for one to be
* checked in.
*
* @param timeout The timeout value in milliseconds
*/
public synchronized Connection getConnection(long timeout) {
long startTime = new Date().getTime();
Connection con;
while ((con = getConnection()) == null) {
try {
wait(timeout);
}
catch (InterruptedException e) {}
if ((new Date().getTime() - startTime) >= timeout) {
// Timeout has expired
return null;
}
}
return con;
}
/**
* Closes all available connections.
*/
public synchronized void release() {
Enumeration allConnections = freeConnections.elements();
while (allConnections.hasMoreElements()) {
Connection con = (Connection) allConnections.nextElement();
try {
con.close();
log("Closed connection for pool " + name);
}
catch (SQLException e) {
log(e, "Can't close connection for pool " + name);
}
}
freeConnections.removeAllElements();
}
/**
* Creates a new connection, using a userid and password
* if specified.
*/
private Connection newConnection() {
Connection con = null;
try {
if (user == null) {
con = DriverManager.getConnection(URL);
}
else {
con = DriverManager.getConnection(URL, user, password);
}
log("Created a new connection in pool " + name);
}
catch (SQLException e) {
log(e, "Can't create a new connection for " + URL);
return null;
}
return con;
}
}
}
* Copyright (c) 1998 by Gefion software.
*
* Permission to use, copy, and distribute this software for
* NON-COMMERCIAL purposes and without fee is hereby granted
* provided that this copyright notice appears in all copies.
*
*/
package com.hanet.db;
import java.io.*;
import java.sql.*;
import java.util.*;
import java.util.Date;
/**
* This class is a Singleton that provides access to one or many
* connection pools defined in a Property file. A client gets
* access to the single instance through the static getInstance()
* method and can then check-out and check-in connections from a pool.
* When the client shuts down it should call the release() method
* to close all open connections and do other clean up.
*/
public class DBConnectionManager {
static private DBConnectionManager instance; // The single instance
static private int clients;
private Vector drivers = new Vector();
private PrintWriter log;
private Hashtable pools = new Hashtable();
/**
* Returns the single instance, creating one if it's the
* first time this method is called.
*
* @return DBConnectionManager The single instance.
*/
static synchronized public DBConnectionManager getInstance() {
if (instance == null) {
instance = new DBConnectionManager();
}
clients++;
return instance;
}
/**
* A private constructor since this is a Singleton
*/
private DBConnectionManager() {
init();
}
/**
* Returns a connection to the named pool.
*
* @param name The pool name as defined in the properties file
* @param con The Connection
*/
public void freeConnection(String name, Connection con) {
DBConnectionPool pool = (DBConnectionPool) pools.get(name);
if (pool != null) {
pool.freeConnection(con);
}
}
/**
* Returns an open connection. If no one is available, and the max
* number of connections has not been reached, a new connection is
* created.
*
* @param name The pool name as defined in the properties file
* @return Connection The connection or null
*/
public Connection getConnection(String name) {
DBConnectionPool pool = (DBConnectionPool) pools.get(name);
if (pool != null) {
return pool.getConnection();
}
return null;
}
/**
* Returns an open connection. If no one is available, and the max
* number of connections has not been reached, a new connection is
* created. If the max number has been reached, waits until one
* is available or the specified time has elapsed.
*
* @param name The pool name as defined in the properties file
* @param time The number of milliseconds to wait
* @return Connection The connection or null
*/
public Connection getConnection(String name, long time) {
DBConnectionPool pool = (DBConnectionPool) pools.get(name);
if (pool != null) {
return pool.getConnection(time);
}
return null;
}
/**
* Closes all open connections and deregisters all drivers.
*/
public synchronized void release() {
// Wait until called by the last client
if (--clients != 0) {
return;
}
Enumeration allPools = pools.elements();
while (allPools.hasMoreElements()) {
DBConnectionPool pool = (DBConnectionPool) allPools.nextElement();
pool.release();
}
Enumeration allDrivers = drivers.elements();
while (allDrivers.hasMoreElements()) {
Driver driver = (Driver) allDrivers.nextElement();
try {
DriverManager.deregisterDriver(driver);
log("Deregistered JDBC driver " + driver.getClass().getName());
}
catch (SQLException e) {
log(e, "Can't deregister JDBC driver: " + driver.getClass().getName());
}
}
}
/**
* Creates instances of DBConnectionPool based on the properties.
* A DBConnectionPool can be defined with the following properties:
* <PRE>
* <poolname>.url The JDBC URL for the database
* <poolname>.user A database user (optional)
* <poolname>.password A database user password (if user specified)
* <poolname>.maxconn The maximal number of connections (optional)
* </PRE>
*
* @param props The connection pool properties
*/
private void createPools(Properties props) {
Enumeration propNames = props.propertyNames();
while (propNames.hasMoreElements()) {
String name = (String) propNames.nextElement();
if (name.endsWith(".url")) {
String poolName = name.substring(0, name.lastIndexOf("."));
String url = props.getProperty(poolName + ".url");
if (url == null) {
log("No URL specified for " + poolName);
continue;
}
String user = props.getProperty(poolName + ".user");
String password = props.getProperty(poolName + ".password");
String maxconn = props.getProperty(poolName + ".maxconn", "0");
int max;
try {
max = Integer.valueOf(maxconn).intValue();
}
catch (NumberFormatException e) {
log("Invalid maxconn value " + maxconn + " for " + poolName);
max = 0;
}
DBConnectionPool pool =
new DBConnectionPool(poolName, url, user, password, max);
pools.put(poolName, pool);
log("Initialized pool " + poolName);
}
}
}
/**
* Loads properties and initializes the instance with its values.
*/
private void init() {
InputStream is = getClass().getResourceAsStream("/db.properties");
Properties dbProps = new Properties();
try {
dbProps.load(is);
}
catch (Exception e) {
System.err.println("Can't read the properties file. " +
"Make sure db.properties is in the CLASSPATH");
return;
}
String logFile = dbProps.getProperty("logfile", "DBConnectionManager.log");
try {
log = new PrintWriter(new FileWriter(logFile, true), true);
}
catch (IOException e) {
System.err.println("Can't open the log file: " + logFile);
log = new PrintWriter(System.err);
}
loadDrivers(dbProps);
createPools(dbProps);
}
/**
* Loads and registers all JDBC drivers. This is done by the
* DBConnectionManager, as opposed to the DBConnectionPool,
* since many pools may share the same driver.
*
* @param props The connection pool properties
*/
private void loadDrivers(Properties props) {
String driverClasses = props.getProperty("drivers");
StringTokenizer st = new StringTokenizer(driverClasses);
while (st.hasMoreElements()) {
String driverClassName = st.nextToken().trim();
try {
Driver driver = (Driver)
Class.forName(driverClassName).newInstance();
DriverManager.registerDriver(driver);
drivers.addElement(driver);
log("Registered JDBC driver " + driverClassName);
}
catch (Exception e) {
log("Can't register JDBC driver: " +
driverClassName + ", Exception: " + e);
}
}
}
/**
* Writes a message to the log file.
*/
private void log(String msg) {
log.println(new Date() + ": " + msg);
}
/**
* Writes a message with an Exception to the log file.
*/
private void log(Throwable e, String msg) {
log.println(new Date() + ": " + msg);
e.printStackTrace(log);
}
/**
* This inner class represents a connection pool. It creates new
* connections on demand, up to a max number if specified.
* It also makes sure a connection is still open before it is
* returned to a client.
*/
class DBConnectionPool {
private int checkedOut;
private Vector freeConnections = new Vector();
private int maxConn;
private String name;
private String password;
private String URL;
private String user;
/**
* Creates new connection pool.
*
* @param name The pool name
* @param URL The JDBC URL for the database
* @param user The database user, or null
* @param password The database user password, or null
* @param maxConn The maximal number of connections, or 0
* for no limit
*/
public DBConnectionPool(String name, String URL, String user, String password,
int maxConn) {
this.name = name;
this.URL = URL;
this.user = user;
this.password = password;
this.maxConn = maxConn;
}
/**
* Checks in a connection to the pool. Notify other Threads that
* may be waiting for a connection.
*
* @param con The connection to check in
*/
public synchronized void freeConnection(Connection con) {
// Put the connection at the end of the Vector
freeConnections.addElement(con);
checkedOut--;
notifyAll();
}
/**
* Checks out a connection from the pool. If no free connection
* is available, a new connection is created unless the max
* number of connections has been reached. If a free connection
* has been closed by the database, it's removed from the pool
* and this method is called again recursively.
*/
public synchronized Connection getConnection() {
Connection con = null;
if (freeConnections.size() > 0) {
// Pick the first Connection in the Vector
// to get round-robin usage
con = (Connection) freeConnections.firstElement();
freeConnections.removeElementAt(0);
try {
if (con.isClosed()) {
log("Removed bad connection from " + name);
// Try again recursively
con = getConnection();
}
}
catch (SQLException e) {
log("Removed bad connection from " + name);
// Try again recursively
con = getConnection();
}
}
else if (maxConn == 0 || checkedOut < maxConn) {
con = newConnection();
}
if (con != null) {
checkedOut++;
}
return con;
}
/**
* Checks out a connection from the pool. If no free connection
* is available, a new connection is created unless the max
* number of connections has been reached. If a free connection
* has been closed by the database, it's removed from the pool
* and this method is called again recursively.
* <P>
* If no connection is available and the max number has been
* reached, this method waits the specified time for one to be
* checked in.
*
* @param timeout The timeout value in milliseconds
*/
public synchronized Connection getConnection(long timeout) {
long startTime = new Date().getTime();
Connection con;
while ((con = getConnection()) == null) {
try {
wait(timeout);
}
catch (InterruptedException e) {}
if ((new Date().getTime() - startTime) >= timeout) {
// Timeout has expired
return null;
}
}
return con;
}
/**
* Closes all available connections.
*/
public synchronized void release() {
Enumeration allConnections = freeConnections.elements();
while (allConnections.hasMoreElements()) {
Connection con = (Connection) allConnections.nextElement();
try {
con.close();
log("Closed connection for pool " + name);
}
catch (SQLException e) {
log(e, "Can't close connection for pool " + name);
}
}
freeConnections.removeAllElements();
}
/**
* Creates a new connection, using a userid and password
* if specified.
*/
private Connection newConnection() {
Connection con = null;
try {
if (user == null) {
con = DriverManager.getConnection(URL);
}
else {
con = DriverManager.getConnection(URL, user, password);
}
log("Created a new connection in pool " + name);
}
catch (SQLException e) {
log(e, "Can't create a new connection for " + URL);
return null;
}
return con;
}
}
}
发表评论
-
1天奋战,Jacob解析word
2008-12-02 13:07 3965由于项目需要,取得word的内容,因研究了下Jacob,尽 ... -
WEB项目开发的进阶二
2008-11-12 17:06 945对于WEB开发,个人认为是这样的,客户端显示+数据处理+ ... -
用数据表实现工作流初想
2008-11-12 10:46 1264最近看了数据结构,其中讲到链我在想是否可以用数据表来实现 ... -
WEB项目开发的进阶---初解
2008-11-10 10:49 1244最近在维护一个项目(包括了解需求,设计,代码,更新,哈 ... -
客户端保存修改的文件至服务器端
2008-10-29 12:32 1043最近因客户需求,想整一个类似于这样的功能: 描述: 一。直 ... -
对于Java的null和""及ArrayList的理解
2008-10-25 12:15 7250最近看了看《Thinking in Java》深有感触,把以前 ... -
对JAVA多线程的理解
2008-10-11 11:09 999最近通过看书和听前辈的讲解,使我对JAVA的多线程有了一些深刻 ... -
Eclipse快捷键操作大全
2008-10-10 19:02 826Eclipse快捷键大全 Ctrl+1 快速修复(最经典的快捷 ... -
JACOB解析WORD的理解
2008-10-09 09:38 9417最近因一个项目需要通过上传后解析WORD里面的TABLE,弄的 ... -
GWT(Google Web Toolkit )--面向 Java 开发人员的 Ajax
2008-10-07 09:15 1269GWT特性 1. GWT编译器 GWT编译器是GWT的核心, ...
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Java JDBC连接池是一种高效管理数据库连接的技术,它允许应用程序重复使用已经建立的数据库连接,从而减少频繁创建和关闭连接带来的开销。在大型系统中,尤其是高并发环境下,使用连接池能够显著提升性能并降低资源...
HikariCP是一款高效、高性能的Java JDBC连接池,它被设计为替代传统连接池如C3P0和DBCP,以提供更快、更稳定的数据访问性能。在HikariCP v3.4.5这个版本中,我们可以深入探讨其在数据库连接管理、性能优化以及配置...
而JDBC连接池是一种管理资源的技术,它能有效地管理和复用数据库连接,提高系统性能并减少系统资源的消耗。在Java应用中,常见的连接池实现有DBCP、C3P0、HikariCP、Druid等。 标题"完美的java jdbc连接池实例.zip...
**JDBC连接池BoneCP_Demo详解** 在Java开发中,数据库操作是不可或缺的一部分,而JDBC(Java Database Connectivity)是Java与数据库交互的标准接口。然而,直接使用JDBC进行数据库连接管理可能会导致资源浪费,...
C3P0是一个开源的JDBC连接池,它实现了数据源和JNDI绑定,支持JDBC3规范和JDBC2的标准扩展。C3P0的主要特点包括: 1. **连接测试**:C3P0提供了多种测试策略,确保获取到的连接是可用的。 2. **连接池初始化和最大...
JDBC连接池是一种资源管理机制,它允许应用程序重复使用已建立的数据库连接,而不是每次需要时都创建新的连接。这显著提高了性能,减少了系统资源的消耗,并有助于避免由于过多的数据库连接导致的问题。在Tomcat早期...
**JDBC连接池DBCP详解** Java数据库连接池(JDBC Connection Pool)是Java应用程序管理数据库连接的一种机制,它能够有效地提高数据库访问效率并优化资源使用。DBCP(Jakarta DBCP,又称为Apache Commons DBCP)是...
C3P0是一个开源的JDBC连接池,它实现了数据源和JNDI绑定,支持JDBC3规范和JDBC2的标准扩展。C3P0的主要特点包括: 1. **自动管理数据库连接**:C3P0会自动创建、配置和管理数据库连接,避免了频繁创建和销毁连接...
关于jdbc连接池连接数据库的原理
这是我写的一个对JDBC连接池的实现,高手见了可不要笑啊!!!! 程序是在linux下用Eclipse下编写的. 用Jude进行建模,数据库使用了mysql. 程序自带了MySql的Connection连接驱动类,你也可以使用别的驱动类和数据库, 在src/...
jdbc连接池代码详解
jdbc连接池属性介绍,
"自定义高并发jdbc连接池"是一个专为处理大量并发请求而设计的解决方案,它允许应用程序高效地管理和复用数据库连接,从而减少数据库连接创建与释放的开销,提高系统的整体性能。 JDBC(Java Database Connectivity...