<? xml version = "1.0" encoding = "gbk" ?>

< Accounts >

< Account type = "by0003" >

< code >100001</ code >

< pass >123</ pass >

< name >李四</ name >

< money >1000000.00</ money >

</ Account >

< Account type = "hz0001" >

< code >100002</ code >

< pass >123</ pass >

< name >张三</ name >

< money >1000.00</ money >

</ Account >

</ Accounts >

java jdbc数据库连接

import java.io.InputStream;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.Properties;

public class JDBConnection {

public Connection conn = null ; // 声明Connection对象的实例

public Statement stmt = null ; // 声明Statement对象的实例

public ResultSet rs = null ; // 声明ResultSet对象的实例

private static String dbClassName = "com.microsoft.jdbc.sqlserver.SQLServerDriver" ; //定义保存数据库驱动的变量

private static String dbUrl = "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=DB_ATM" ;

private static String dbUser = "sa" ;

private static String dbPwd = "sa" ;

public JDBConnection(String propertyFileName) { // 带属性文件名的构造方法

Properties prop = new Properties(); // 属性集合对象

InputStream is = null ;

try {

is = JDBConnection. class .getClassLoader().getResourceAsStream(

propertyFileName); // 属性文件输入流

// is = new FileInputStream("src/" + propertyFileName);

prop.load(is); // 将属性文件流装载到Properties对象中

is.close(); // 关闭流

dbClassName = prop.getProperty( "dbClassName" );

dbUrl = prop.getProperty( "dbUrl" );

dbUser = prop.getProperty( "dbUser" );

dbPwd = prop.getProperty( "dbPwd" );

} catch (Exception e) {

System.out.println( "属性文件 " + propertyFileName + " 打开失败！" );

}

try {

Class.forName(dbClassName); // 1.注册驱动

} catch (ClassNotFoundException e) {

e.printStackTrace();

}

}

public JDBConnection() { // 默认的不带参数的构造函数

try {

Class.forName(dbClassName); // 1.注册驱动

} catch (ClassNotFoundException e) {

e.printStackTrace();

}

}

public static Connection getConnection() {

Connection conn = null ;

try {

// Class.forName(dbClassName);// 1.注册驱动

conn = DriverManager.getConnection(dbUrl, dbUser, dbPwd); //2.建立与数据库的链接

} catch (Exception ee) {

ee.printStackTrace();

}

if (conn == null ) {

System.err

.println( "警告: DbConnectionManager.getConnection() 获得数据库链接失败.rnrn链接类型:"

+ dbClassName

+ "rn链接位置:"

+ dbUrl

+ "rn用户/密码"

+ dbUser + "/" + dbPwd);

}

return conn;

}

/*

* 功能：执行查询语句

*/

public ResultSet executeQuery(String sql) {

try { // 捕捉异常

conn = getConnection(); // 调用getConnection()方法构造Connection对象的一个实例conn

stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,//3.创建语句

ResultSet.CONCUR_READ_ONLY);

rs = stmt.executeQuery(sql);//4.执行查询

} catch (SQLException ex) {

System.err.println(ex.getMessage()); // 输出异常信息

}

return rs; // 返回结果集对象 5.结果处理

}

/*

* 功能:执行更新操作

*/

public int executeUpdate(String sql) {

int result = 0; // 定义保存返回值的变量

try { // 捕捉异常

conn = getConnection(); // 调用getConnection()方法构造Connection对象的一个实例conn

stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,

ResultSet.CONCUR_READ_ONLY);

result = stmt.executeUpdate(sql); // 执行更新操作

} catch (SQLException ex) {

result = 0; // 将保存返回值的变量赋值为0

}

return result; // 返回保存返回值的变量

}

/*

* 功能:关闭数据库的连接

*/

public void close() { //6.释放资源

try { // 捕捉异常

try {

if (rs != null ) { // 当ResultSet对象的实例rs不为空时

rs.close(); // 关闭ResultSet对象

}

} finally {

try {

if (stmt != null ) { // 当Statement对象的实例stmt不为空时

stmt.close(); // 关闭Statement对象

}

} finally {

if (conn != null ) { // 当Connection对象的实例conn不为空时

conn.close(); // 关闭Connection对象

}

}

}

} catch (Exception e) {

e.printStackTrace(System.err); // 输出异常信息

}

}

}属性文件

dbClassName=com.microsoft.jdbc.sqlserver.SQLServerDriver

dbClassName2=com.mysql.jdbc.Driver

dbPwd=sa

dbPwd2=root

dbUrl=jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=DB_ATM

dbUrl2=jdbc:mysql://localhost:3306/db_atm

dbUser=sa

dbUser2=root

java自定义按钮外观

import java.awt.FlowLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.UIManager;

import javax.swing.plaf.synth.SynthLookAndFeel;

public class MyButton {

JFrame frame = new JFrame( "Test Buttons" );

JButton jButton = new JButton( "JButton" ); // 按钮

public MyButton() {

frame.setLayout( new FlowLayout());

frame.getContentPane().add(jButton);

}

public void show() {

frame.pack();

frame.show();

}

public static void main(String[] args) {

MyButton tb = new MyButton();

tb.show();

SynthLookAndFeel slf = new SynthLookAndFeel();

try {

slf.load(MyButton. class .getResourceAsStream( "mybutton.xml" ), MyButton. class );

UIManager.setLookAndFeel(slf);

} catch (Exception e) {

e.printStackTrace();

return ;

}

}

}

< synth >

< style id = "mybutton" >

< state >

< imagePainter method = "buttonBackground" path = "mybutton.png" sourceInsets = "3 6 12 20" paintCenter = "true" stretch = "true" />

< insets top = "3" left = "6" bottom = "12" right = "20" />

< font name = "Aharoni" size = "16" />

</ state >

< property key = "Button.margin" type = "insets" value = "0 0 5 8" />

</ style >

< bind style = "mybutton" type = "region" key = "Button" />

</ synth >

java访问资源文件

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.util.Properties;

public class PropertyEditor {

public static void main(String[] args) throws Exception {

Properties prop = new Properties(); // 属性集合对象

FileInputStream fis = new FileInputStream( "prop.properties" ); // 属性文件输入流 (相对于根目录下的文件名，要加上包名 “src/prop.properties”)

prop.load(fis); // 将属性文件流装载到Properties对象中

fis.close(); // 关闭流

// 获取属性值，sitename已在文件中定义

System.out.println( "获取属性值：sitename=" + prop.getProperty( "sitename" ));

// 获取属性值，country未在文件中定义，将在此程序中返回一个默认值，但并不修改属性文件

System.out.println( "获取属性值：country=" + prop.getProperty( "country" , "中国" ));

// 修改sitename的属性值

prop.setProperty( "sitename" , "中国" );

// 添加一个新的属性studio

prop.setProperty( "studio" , "Boxcode Studio" );

// 文件输出流

FileOutputStream fos = new FileOutputStream( "prop.properties" );

// 将Properties集合保存到流中

prop.store(fos, "Copyright (c) Boxcode Studio" );

fos.close(); // 关闭流

}

}

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