jdbc_sql.java

自己写的新闻发布系统

package Eclass;
import java.sql.*;
import java.util.*;
import java.text.*;
import java.io.*; 
public class jdbc_sql
{String conn_str="jdbc:microsoft:sqlserver://127.0.0.1:1433;DatabaseName=install_news";//---------数据库
String username="sa";//---------------数据库用户名
String password="wm363400";//-------------数据库密码
private Connection conn=null;
private Statement stmt=null;
ResultSet rs=null;
//----------------------数据库链接----------------
public jdbc_sql()
{
try{Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
}
catch(java.lang.ClassNotFoundException e) {System.err.println("dbclass():"+e.getMessage());}
try{
conn=DriverManager.getConnection(conn_str,username,password);
}
catch(SQLException ex) {
System.err.println("dbclass():"+ex.getMessage());}
}
//---------------------数据库查询-----------------
public ResultSet query(String sql)
{
try{
stmt=conn.createStatement();
rs=stmt.executeQuery(sql);}
catch(SQLException ex) {System.err.println("query():"+ex.getMessage());}
return rs;
}
//－－－－－－－－－－－数据库修改－－－－－－－－－
public void update(String sql)
{
try{
stmt=conn.createStatement();
stmt.executeUpdate(sql);}
catch(SQLException ex) {System.err.println("update():"+ex.getMessage());}
}
//－－－－－－－－－－关闭数据源－－－－－－－
public void closestmt()
{try{stmt.close();}
catch(SQLException ex) {System.err.println("closestmt():"+ex.getMessage());}
}
//－－－－－－－－－－关闭链接－－－－－－－－－
public void closeconn()
{try{conn.close();}
catch(SQLException ex) {System.err.println("closeconn()"+ex.getMessage());}
}
//---------------------转换中文
public String toChinese(String s){
        if(s==null)
            return null;
        try{
            String convert=new String(s.getBytes("ISO8859-1"),"gb2312");
            return convert;
        }catch(Exception e){}
        return null;
    }
//--------------------分页
public String page1(int num,int line,int page_line,int start,int page,String search,String filename){
int pagetotal=line*page_line;//所要显示的总条数
int pagestart;//
int pagenum;//
int total=(num-start+line-1)/line;//取得总页数
int total_start=(num+pagetotal-1)/pagetotal;//取得总偏移数
String returnstr="";
if(start!=0)
{
int old_start=start-pagetotal;
returnstr+="&nbsp;&nbsp;<a href="+filename+"?page=0&start="+old_start+search+"><<</a>";
}
pagestart=start/pagetotal*page_line;//取得当前页数
for(int i=0;i<total&&i<page_line;i++)
{
pagenum=pagestart+i+1;
returnstr+="&nbsp;&nbsp;<a href="+filename+"?page="+i+"&start="+start+search+">"+pagenum+"</a>";
}
if(total_start!=(start/pagetotal+1)&&num!=0)
{
int new_start=start+pagetotal;
returnstr+="&nbsp;&nbsp;<a href="+filename+"?page=0&start="+new_start+search+">>></a>";
}
return returnstr;
}

//-------------------------------取得时间
public String GetPath(){
String dateString="123";
try{
java.text.SimpleDateFormat formatter=new java.text.SimpleDateFormat("yyyy-MM");
java.util.Date currentTime_1=new java.util.Date();
dateString=formatter.format(currentTime_1);
}catch(Exception e){
     }
 return dateString;
 } 

//-------------------------------取得时间
public String strNowtime(){
String dateString="123";
try{
java.text.SimpleDateFormat formatter=new java.text.SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
java.util.Date currentTime_1=new java.util.Date();
dateString=formatter.format(currentTime_1);
}catch(Exception e){
     }
 return dateString;
 } 

//--------------------------去掉html---------------------------
  public String HTMLEncode(String Str){
  	Str=ebbReplace(Str,"<","&lt;");
  	Str=ebbReplace(Str,">","&gt;");
  	Str=ebbReplace(Str,"\n","<BR>");
  	return Str;
  	}
//--------------------------替换变量---------------------------
  public String ebbReplace(String Str,String oldStr,String newStr){
       String ReturnStr="";
      int i,j,t,m,n;
      n=0;
      j=oldStr.length();
      if (Str.indexOf(oldStr)>-1)
      {
      while(Str.indexOf(oldStr,n)>-1)
      {
      i=Str.length();
      if (Str.indexOf(oldStr)==0)
         Str=newStr+Str.substring(j,i);
      else
      {
        t=Str.indexOf(oldStr);
        m=(t+j);
        Str=Str.substring(0,t)+newStr+Str.substring(m,i);
        n=t+newStr.length()-j+1;
      }
      }
      }
      ReturnStr=Str;
      return ReturnStr;

  }
//----------------------------ubb替换--------------------------
  public String LCReplace(String Str,String BStr,String EStr,String ReStr){
  String ReturnStr="",Str1="",Str2="";
  int i,j,n;
  n=0;
  if ((Str.indexOf(BStr)>-1)&&((Str.indexOf(EStr)>-1)))
  {
  	while(Str.indexOf(BStr,n)>-1)
  	{
  		i=Str.indexOf(BStr);
  		j=Str.indexOf(EStr);
  		Str1=Str.substring((i+BStr.length()),j);
                Str2=ebbReplace(ReStr,"$lichao$",Str1);
                Str1=BStr+Str1+EStr;
                Str=ebbReplace(Str,Str1,Str2);
  	            n=i+Str2.length()-Str1.length();
          }
  	}
  	ReturnStr=Str;
  	return ReturnStr;
  }

}