Mysql的最大连接数用java程序测试的方法

以前工作的时候由于Oracle8i数据库经常出现用户过多的错误,由于数据量大,经常出现ORA:12500错误,但主要原因是访问过多而引起的,后来就用Java写了个简单的用JDBC连接来测试Oracle最大连接数的程序.现在常用mysql,所以又写了一个简单的测试其最大连接数的程序，在此介绍给大家：

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"

}

}