用java程序測試Mysql的最大連接數

以前工作的時候由於Oracle8i數據庫經常出現用戶過多的錯誤,由於數據量大,經常出現ORA:12500錯誤,但主要原因是訪問過多而引起的,後來就用Java寫了個簡單的用JDBC連接來測試Oracle最大連接數的程序.現在常用MySQL,所以又寫了一個簡單的測試其最大連接數的程序，在此介紹給大家：

import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.Statement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.io.IOException;
 class testMaxConn{
   public static void main(String args[]){
     int count=0;
     Connection []conn=new Connection[1000];
     Statement  []stmt =new Statement[1000];
     ResultSet  []rs =new ResultSet[1000];
    try{
     Class.forName
("com.MySQL.jdbc.Driver").newInstance();
for(count=0;count<300;count++){
conn[count] = DriverManager.getConnection
("jdbc:mysql://localhost/MySQL", "root", "");
      stmt[count]=conn[count].createStatement();
      rs[count]=stmt[count].executeQuery
("SELECT * FROM user");
      while (rs[count].next()){
  //System.out.println(rs.getString(1)+
"\t "+rs.getString(2));  
      }
      System.out.print(count+"\t");
     }
    }catch(SQLException ex1){
      System.out.println("\n"+ex1.toString());
    }catch(InstantiationException ex2){
      System.out.println("\n"+ex2.toString());
    }catch(ClassNotFoundException ex3){
      System.out.println("\n"+ex3.toString());
    }catch(IllegalAccessException ex4){
      System.out.println("\n"+ex4.toString());
    }finally{
      try{
        System.out.println("\nSystem has opened 
"+count--+" MySQL connections.\nPress Enter key 
to close the connections");
        System.in.read();
        System.out.println
("\nClose the Connections:");
        for(;count>=0;count--){
         rs[count].close();
         stmt[count].close();
         conn[count].close();
         System.out.print(count+"\t");
        }
      }catch(SQLException ex){
       System.out.println
("\n Close connection exception:"+ex.toString());
      }catch(IOException io_ex){}
    }//end the first "try"
   }
 }