BlogJava-氧气中毒 - J2EE-随笔分类-JSP/SERVLET/JAVA

BlogJava-氧气中毒 - J2EE-随笔分类-JSP/SERVLET/JAVAhttp://www.blogjava.net/kobe09/category/12169.html爪吐奕奕征途zh-cnWed, 28 Feb 2007 08:19:33 GMTWed, 28 Feb 2007 08:19:33 GMT60几则JSP入门知识总结http://www.blogjava.net/kobe09/archive/2006/06/14/52757.html氧气中毒氧气中毒Wed, 14 Jun 2006 07:19:00 GMThttp://www.blogjava.net/kobe09/archive/2006/06/14/52757.htmlhttp://www.blogjava.net/kobe09/comments/52757.htmlhttp://www.blogjava.net/kobe09/archive/2006/06/14/52757.html#Feedback0http://www.blogjava.net/kobe09/comments/commentRss/52757.htmlhttp://www.blogjava.net/kobe09/services/trackbacks/52757.html 1.传递表单参数：
String name = new String(request.getParameter("name"));

2.数据库连接：
~~MYSQL
//设置数据库的URL
String url = "jdbc:mysql://localhost:3306/jspsky";
try
//加载驱动程序
Class.forname("org.gjt.mm.mysql.Driver").newInstance();
//建立连接
java.sql.Connection connection = java.sql.DriverManager.getConnection(url);
java.sql.Statement statement = connection.createStatement();
//SQL语句
String sqlStringi ="insert into commu(name,tel,mobile,oicq,email)values(‘"+name+"',‘"+tel+"',‘"+mobile+"',‘"+oicq+"',‘"+email+"')";
//运行SQL语句，并建立结果集
java.sql.ResultSet rsi = statement.executeQuery(sqlStringi);
//在屏幕上输出库中的内容
while(rss.next())
{
String a_name = rss.getString(1);
out.println(a_name);
{}
//关闭连接
connection.close();
}

//捕捉异常
catch(java.sql.SQLException e)

out.println(e.getMessage());
{}
catch(ClassNotFoundException e)

out.println(e.getMessage());
{}

~~DB2
//定义数据库的URL
String url = "jdbc:db2:portal";
try

//加载驱动程序
Class.forName("COM.ibm.db2.jdbc.app.DB2Driver");
//建立连接，
java.sql.Connection connection = java.sql.DriverManager.getConnection(url,"user","password");
java.sql.Statement statement = connection.createStatement();
//SQL语句
String sqlString = "select * from client";
//执行SQL语句
java.sql.ResultSet rs = statement.executeQuery(sqlString);
//在屏幕上显示所连表中的内容
while(rs.next())
{
String name = rs.getString(1);
out.println(name);
{}
//关闭连接
connection.close();
}
//捕捉异常
catch(java.sql.SQLException e)

out.println(e.getMessage());
{}
catch(ClassNotFoundException e)

out.println(e.getMessage());
{}

3.文件操作

~~将一个字符串写到一个指定的文件中，如果该文件不存在，则新建一个文件，并完成写入；如果存在，则用此字符串覆盖原文件的所有内容
import java.io.*;
String str = "print me 雪峰!";
//定义好打印的目标文件名

//取得当前主机存放WEB页面的绝对路径
String hostdir = System.getProperty("user.dir");
//取得当前主机所采用的路径分隔符
String fileBar = System.getProperty("file.separator");
//书写完整的目标文件存放路径
String nameOfFile=hostdir+fileBar+"test.html";

try
//实例化一个文件输出流对象
FileOutputStream afile = new FileOutputStream(nameOfFile);
//将文件输出流，创建一个打印输出流对象
PrintWriter pw = new PrintWriter(afile);
pw.println(str);
//clean up
pw.close();
{}
catch(IOException e)
out.println(e.getMessage());
{}

~~列出指定目录下的文件列表
import java.io.*;
String cdur = System.getProperty("user.dir");
String fileBar = System.getProperty("file.separator");
String mydir =cdur+fileBar+"doc"+fileBar+"jspsky";
File my = new File(mydir);
String d[] = my.list();
int i;
int l=d.length;
for(i=0;i out.print(d);
{}

4.计数器
Integer count = null;
synchronized (application)
count =(Integer) application.getAttribute("d");
if (count ==null)
count =new Integer("0");
count = new Integer(count.intValue()+1);
application.setAttribute("d",count);
{}
out.println(count);
// 首先定义一个整形对象，并初始化为：NULL，
// 取回APPLICATION对像的属性D的值，并强制转化为整形对象，赋给COUNT
// 判断COUNT是否为空，为空时，将O赋给COUNT对象，
// 否则，通过COUNT。INTVALUE（）方法，实现COUNT对象加1，并赋值给COUNT
// 最后，将COUNT对象保存在APPLICATION对象的D变量中。

氧气中毒 2006-06-14 15:19 发表评论

]]>JAVA全角和半角的转换.http://www.blogjava.net/kobe09/archive/2006/06/14/52742.html氧气中毒氧气中毒Wed, 14 Jun 2006 07:07:00 GMThttp://www.blogjava.net/kobe09/archive/2006/06/14/52742.htmlhttp://www.blogjava.net/kobe09/comments/52742.htmlhttp://www.blogjava.net/kobe09/archive/2006/06/14/52742.html#Feedback0http://www.blogjava.net/kobe09/comments/commentRss/52742.htmlhttp://www.blogjava.net/kobe09/services/trackbacks/52742.html