druid简单教程

url:jdbc:mysql://localhost:3306/dragoon_v25_masterdb  
driverClassName:com.mysql.jdbc.Driver  
username:root  
password:aaaaaaaa  
       
filters:stat  
   
maxActive:20  
initialSize:1  
maxWait:60000  
minIdle:10  
#maxIdle:15  
   
timeBetweenEvictionRunsMillis:60000  
minEvictableIdleTimeMillis:300000  
   
validationQuery:SELECT ‘x‘  
testWhileIdle:true  
testOnBorrow:false  
testOnReturn:false  
#poolPreparedStatements:true  
maxOpenPreparedStatements:20  
  
#对于长时间不使用的连接强制关闭  
removeAbandoned:true  
#超过30分钟开始关闭空闲连接  
removeAbandonedTimeout:1800  
#将当前关闭动作记录到日志  
logAbandoned:true  

<?xml version="1.0" encoding="UTF-8"?>  
<beans xmlns="http://www.springframework.org/schema/beans"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd  
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">  
    <!-- 给web使用的spring文件 -->  
    <bean id="propertyConfigurer"  
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">  
        <property name="locations">  
            <list>  
                <value>/WEB-INF/classes/dbconfig.properties</value>  
            </list>  
        </property>  
    </bean>  
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"  
        destroy-method="close">  
        <property name="url" value="${url}" />  
        <property name="username" value="${username}" />  
        <property name="password" value="${password}" />  
        <property name="driverClassName" value="${driverClassName}" />  
        <property name="filters" value="${filters}" />  
  
        <property name="maxActive" value="${maxActive}" />  
        <property name="initialSize" value="${initialSize}" />  
        <property name="maxWait" value="${maxWait}" />  
        <property name="minIdle" value="${minIdle}" />  
  
        <property name="timeBetweenEvictionRunsMillis" value="${timeBetweenEvictionRunsMillis}" />  
        <property name="minEvictableIdleTimeMillis" value="${minEvictableIdleTimeMillis}" />  
  
        <property name="validationQuery" value="${validationQuery}" />  
        <property name="testWhileIdle" value="${testWhileIdle}" />  
        <property name="testOnBorrow" value="${testOnBorrow}" />  
        <property name="testOnReturn" value="${testOnReturn}" />  
        <property name="maxOpenPreparedStatements"  
            value="${maxOpenPreparedStatements}" />  
        <property name="removeAbandoned" value="${removeAbandoned}" /> <!-- 打开removeAbandoned功能 -->  
        <property name="removeAbandonedTimeout" value="${removeAbandonedTimeout}" /> <!-- 1800秒，也就是30分钟 -->  
        <property name="logAbandoned" value="${logAbandoned}" /> <!-- 关闭abanded连接时输出错误日志 -->  
    </bean>  
      
    <bean id="dataSourceDbcp" class="org.apache.commons.dbcp.BasicDataSource"  
        destroy-method="close">  
  
        <property name="driverClassName" value="${driverClassName}" />  
        <property name="url" value="${url}" />  
        <property name="username" value="${username}" />  
        <property name="password" value="${password}" />  
          
        <property name="maxActive" value="${maxActive}" />  
        <property name="minIdle" value="${minIdle}" />  
        <property name="maxWait" value="${maxWait}" />  
        <property name="defaultAutoCommit" value="true" />  
          
        <property name="timeBetweenEvictionRunsMillis" value="${timeBetweenEvictionRunsMillis}" />  
        <property name="minEvictableIdleTimeMillis" value="${minEvictableIdleTimeMillis}" />  
          
        <property name="validationQuery" value="${validationQuery}" />  
        <property name="testWhileIdle" value="${testWhileIdle}" />  
        <property name="testOnBorrow" value="${testOnBorrow}" />  
        <property name="testOnReturn" value="${testOnReturn}" />  
        <property name="maxOpenPreparedStatements"  
            value="${maxOpenPreparedStatements}" />  
        <property name="removeAbandoned" value="${removeAbandoned}" />   
        <property name="removeAbandonedTimeout" value="${removeAbandonedTimeout}" />  
        <property name="logAbandoned" value="${logAbandoned}" />  
    </bean>  
  
      
    <!-- jdbcTemplate -->  
    <bean id="jdbc" class="org.springframework.jdbc.core.JdbcTemplate">  
        <property name="dataSource">  
            <ref bean="dataSource" />  
        </property>  
    </bean>  
  
    <bean id="SpringTableOperatorBean" class="com.whyun.druid.model.TableOperator"  
        scope="prototype">  
        <property name="dataSource">  
            <ref bean="dataSource" />  
        </property>  
    </bean>  
      
</beans>

package com.whyun.druid.model;  
  
import java.sql.Connection;  
import java.sql.PreparedStatement;  
import java.sql.SQLException;  
import java.sql.Statement;  
  
import javax.sql.DataSource;  
  
public class TableOperator {  
    private DataSource dataSource;  
    public void setDataSource(DataSource dataSource) {  
        this.dataSource = dataSource;  
    }  
  
    private static final int COUNT = 800;      
  
    public TableOperator() {  
          
    }  
  
    public void tearDown() throws Exception {  
        try {  
            dropTable();  
        } catch (SQLException e) {  
            e.printStackTrace();  
        }         
    }  
  
    public void insert() throws Exception {  
          
        StringBuffer ddl = new StringBuffer();  
        ddl.append("INSERT INTO t_big (");  
        for (int i = 0; i < COUNT; ++i) {  
            if (i != 0) {  
                ddl.append(", ");  
            }  
            ddl.append("F" + i);  
        }  
        ddl.append(") VALUES (");  
        for (int i = 0; i < COUNT; ++i) {  
            if (i != 0) {  
                ddl.append(", ");  
            }  
            ddl.append("?");  
        }  
        ddl.append(")");  
  
        Connection conn = dataSource.getConnection();  
  
//        System.out.println(ddl.toString());  
  
        PreparedStatement stmt = conn.prepareStatement(ddl.toString());  
  
        for (int i = 0; i < COUNT; ++i) {  
            stmt.setInt(i + 1, i);  
        }  
        stmt.execute();  
        stmt.close();  
  
        conn.close();  
    }  
  
    private void dropTable() throws SQLException {  
  
        Connection conn = dataSource.getConnection();  
  
        Statement stmt = conn.createStatement();  
        stmt.execute("DROP TABLE t_big");  
        stmt.close();  
  
        conn.close();  
    }  
  
    public void createTable() throws SQLException {  
        StringBuffer ddl = new StringBuffer();  
        ddl.append("CREATE TABLE t_big (FID INT AUTO_INCREMENT PRIMARY KEY ");  
        for (int i = 0; i < COUNT; ++i) {  
            ddl.append(", ");  
            ddl.append("F" + i);  
            ddl.append(" BIGINT NULL");  
        }  
        ddl.append(")");  
  
        Connection conn = dataSource.getConnection();  
  
        Statement stmt = conn.createStatement();  
        stmt.execute(ddl.toString());  
        stmt.close();  
  
        conn.close();  
    }  
}  

package com.whyun.druid.servelt;  
  
import java.io.IOException;  
import java.io.PrintWriter;  
import java.sql.SQLException;  
  
import javax.servlet.ServletContext;  
import javax.servlet.ServletException;  
import javax.servlet.http.HttpServlet;  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  
  
import org.springframework.web.context.WebApplicationContext;  
import org.springframework.web.context.support.WebApplicationContextUtils;  
  
import com.whyun.druid.model.TableOperator;  
  
public class TestServlet extends HttpServlet {  
    private TableOperator operator;  
      
  
    @Override  
    public void init() throws ServletException {  
          
        super.init();  
         ServletContext servletContext = this.getServletContext();     
           
         WebApplicationContext ctx  
            = WebApplicationContextUtils.getWebApplicationContext(servletContext);  
         operator = (TableOperator)ctx.getBean("SpringTableOperatorBean");  
    }  
  
    /** 
     * The doGet method of the servlet. <br> 
     * 
     * This method is called when a form has its tag value method equals to get. 
     *  
     * @param request the request send by the client to the server 
     * @param response the response send by the server to the client 
     * @throws ServletException if an error occurred 
     * @throws IOException if an error occurred 
     */  
    public void doGet(HttpServletRequest request, HttpServletResponse response)  
            throws ServletException, IOException {  
  
        response.setContentType("text/html");  
        PrintWriter out = response.getWriter();  
  
        boolean createResult = false;  
        boolean insertResult = false;  
        boolean dropResult = false;  
          
        try {  
            operator.createTable();  
            createResult = true;  
        } catch (SQLException e) {  
            e.printStackTrace();  
        }  
        if (createResult) {  
            try {  
                operator.insert();  
                insertResult = true;  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
            try {  
                operator.tearDown();  
                dropResult = true;  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
        }  
          
          
        out.println("{‘createResult‘:"+createResult+",‘insertResult‘:"  
                +insertResult+",‘dropResult‘:"+dropResult+"}");  
          
        out.flush();  
        out.close();  
    }  
  
}