Java Application Ö±½Óͨ¹ýjndiÁ¬½ÓÊý¾Ý¿â
ʹÓÃjar°ü:
commons-pool-1.5.3.jar,tomcat-naming-common.jar,commons-pool-1.5.3-bin.zip,commons-dbcp.jar
×¢Òâ:jdbc Çý¶¯ÒªÓëÊý¾Ý¿â¼æÈÝ.
package test.comm;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Hashtable;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
import org.apache.commons.dbcp.BasicDataSource;
public class DBConnector {
static private InitialContext ic = null;
static private DataSource ds = null;
static private void initContext(){
try {
BasicDataSource bds = new BasicDataSource();
bds.setUrl("jdbc:oracle:thin:@localhost:1521:test");
bds.setDriverClassName("oracle.jdbc.OracleDriver");
bds.setUsername("test");
bds.setPassword("a");
Hashtable<String, String> evn = new Hashtable<String,String>();
evn.put("java.naming.factory.initial","org.apache.naming.java.javaURLContextFactory");
ic = new InitialContext(evn);
ic.bind("mydatasource", bds);
ds = (DataSource) ic.lookup("mydatasource");
} catch (NamingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
static public Connection getConn() throws SQLException{
if (ds == null){
initContext();
}
return ds.getConnection();
}
}
²âÊÔ:
package test;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import test.comm.DBConnector;
public class wfTest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
Connection conn = DBConnector.getConn();
System.out.println("conn = "+conn);
String qSQL = "SELECT USERNAME,LOGINID from S_U_USER";
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(qSQL);
while (rs.next()){
System.out.println(rs.getString("USERNAME"));
System.out.print("
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Ò»¡¢¼ÆËãÔ²µÄÃæ»ýµÄcalArea£¨£©·½·¨£»
¶þ¡¢¼ÆËãÖܳ¤µÄcalLength£¨£©·½·¨£»
Èý¡¢boolean inCircle£¨MyPoint mp£©·½·¨£¬¹¦ÄÜÊDzâÊÔ×÷Ϊ²ÎÊýµÄij¸öµãÊÇ·ñÔÚµ±Ç°¶ÔÏóÔ²ÄÚ£¨Ô²ÄÚ£¬°üÀ¨Ô²ÉÏ·µ»Øtrue£¬ÔÚÔ²Íâ·µ»Øfalse£©¡£
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clas ......
package chape7;
/**
* 檢²é參數µÄÓÐЧÐÔ
* 當編寫·½·¨»òÕß構ÔìÆ÷時£¬應該¿¼慮ËûµÄ參數ÓÐʲ÷áÏÞÖÆ 應該°É這ЩÏÞÖÆ寫ÔÚÎÄ檔ÖУ¬並ÇÒÔÚ這個·½·¨µÄ開頭 ......
package chape8;
import java.math.BigDecimal;
/**
* 8-48
* Èç¹ûÏëÒªÖªµÀ¾«È·µÄ´ð°¸£¬¾ÍÒª±ÜÃâʹÓÃdoubleºÍfloat
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ÄÇ´ó¼Ò¶¼ÖªµÀÔÙÎÒÃǵÄJavaÓïÑÔÀïÃæÓÐÁ½¸ö¸¡µãÊýÀàÐ͵ıäÁ¿floatºÍdouble£¬
¿ÉÄÜ´ó¼Ò»áÈÏΪËûÃǵľ«¶È¶ÔÓÚ½ðÈÚÐÐÒµÕâÑù¶ÔÊý×Öà ......
ÈçÌ⣡½â¾öµÄ·½·¨ÊÇÔö¼ÓÒ»¸öÐé±³¾°¡£Ö®ºó°ÑÐé±³¾°Ôö¼Óµ½ÔÀ´µÄFrameÉÏ¡£ÓÉÓÚrepaint()µ½paint()ÖмäÉæ¼°µ½update(),ËùÒÔ½â¾öÎÊÌâµÄ
¹Ø¼üÊÇÔÚÖØÐ´update(),ÔÚÕâ¸ö·½·¨ÖÐʵÏÖÐé±³¾°µÄÌí¼Ó~~
@Override
public void update(Graphics g)
{
if(offScreenImage == null)
......
java exception ½â¾ö·½°¸ - ÎÒµÄÒì³£Íø|Òì³£|exception 791 - java.lang.NoSuchMethodError 792 - RuntimeException 793 - org.hibernate.exception.SQLGrammarException 794 - Internal Error 795 - ×Ô¶¨ÒåÒì³£ 796 - org.dom4j.DocumentException 797 - java.net.SocketException 798 - Exception¶ÔÏó 799 - SQLE ......