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SpringMVC+JDBC+Druid

Druid GitHub：https://github.com/alibaba/druid/wiki/%E5%B8%B8%E8%A7%81%E9%97%AE%E9%A2%98
工具：idea

步骤：

这里也可以选择自己安装的maven

next然后填写项目名然后 finish

项目构建中...

ok，项目构建完成，如下图所示。左边是项目构建完成的目录结构，右边是maven配置文件，只有一个junit。

下面开始编辑配置文件引入我们需要的库

1  <!--第三方库的配置文件-->
2     <properties>
3         <junit.version>3.8.1</junit.version>
4         <spring.version>4.1.6.RELEASE</spring.version>
5         <mysql.connector.java.version>5.1.26</mysql.connector.java.version>
6         <druid.version>1.0.7</druid.version>
7         <org.slf4j.log4j12.version>1.7.5</org.slf4j.log4j12.version>
8     </properties>

在 <dependencies> 标签上面插入上面的代码，这是库的版本，当然也可以省略这一步骤，下面的库中直接填写版本。

 1  <!-- Log 框架 -->
 2         <dependency>
 3             <groupId>org.slf4j</groupId>
 4             <artifactId>slf4j-log4j12</artifactId>
 5             <version>${org.slf4j.log4j12.version}</version>
 6         </dependency>
 7         <!--springmvc-->
 8         <dependency>
 9             <groupId>org.springframework</groupId>
10             <artifactId>spring-webmvc</artifactId>
11             <version>${spring.version}</version>
12         </dependency>
13         <!--jdbc-->
14         <dependency>
15             <groupId>org.springframework</groupId>
16             <artifactId>spring-jdbc</artifactId>
17             <version>${spring.version}</version>
18         </dependency>
19 
20         <!--mysql驱动-->
21         <dependency>
22             <groupId>mysql</groupId>
23             <artifactId>mysql-connector-java</artifactId>
24             <version>${mysql.connector.java.version}</version>
25         </dependency>
26 
27         <!-- 阿里巴巴 diuid -->
28         <dependency>
29             <groupId>com.alibaba</groupId>
30             <artifactId>druid</artifactId>
31             <version>${druid.version}</version>
32         </dependency>

在 <dependencies> 中插入上面的代码引入这几个库功能不多暂时引用这几个就可以了。

打开maven视图，然后刷新，这个过程可能会很慢，等待库下载完毕。如果idea没有视图在左下角找一下

下载完毕后，可以看到多了很多包

在resource文件夹下新建三个xml文件分别是 spring-druid.xml spring-jdbc.xml spring-mvc.xml 和两个 properties文件分别是config.properties和 log4g.properties

config.properties

1 jdbc_url=jdbc:mysql://127.0.0.1:3306/myblog?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull
2 jdbc_username=root
3 jdbc_password=root
4 driver_name=com.mysql.jdbc.Driver
5 
6 validationQuery=SELECT 1

log4j.properties

 1  ### u8BBEu7F6E###
 2 log4j.rootLogger = info,stdout,logfile
 3 
 4 ### u8F93u51FAu4FE1u606Fu5230u63A7u5236u62AC ###
 5 log4j.appender.stdout = org.apache.log4j.ConsoleAppender
 6 log4j.appender.stdout.Target = System.out
 7 log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
 8 log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n
 9 
10 ### u8F93u51FADEBUG u7EA7u522Bu4EE5u4E0Au7684u65E5u5FD7u5230=E://logs/error.log ###
11 log4j.appender.logfile = org.apache.log4j.DailyRollingFileAppender
12 log4j.appender.logfile.File = D://logs/log.log
13 log4j.appender.logfile.Append = true
14 log4j.appender.logfile.Threshold = DEBUG 
15 log4j.appender.logfile.layout = org.apache.log4j.PatternLayout
16 log4j.appender.logfile.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n
17 
18 ### u8F93u51FAERROR u7EA7u522Bu4EE5u4E0Au7684u65E5u5FD7u5230=E://logs/error.log ###
19 log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
20 log4j.appender.E.File =D://logs/error.log 
21 log4j.appender.E.Append = true
22 log4j.appender.E.Threshold = ERROR 
23 log4j.appender.E.layout = org.apache.log4j.PatternLayout
24 log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

spring-druid.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!-- 配置druid数据源 -->
    <bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
          init-method="init" destroy-method="close">
        <!-- 数据库连接基础信息 -->
        <property name="url" value="${jdbc_url}" />
        <property name="username" value="${jdbc_username}" />
        <property name="password" value="${jdbc_password}" />

        <!-- 初始化连接大小 -->
        <property name="initialSize" value="2" />
        <!-- 连接池最大使用连接数量 -->
        <property name="maxActive" value="20" />
        <!-- 连接池最小空闲 -->
        <property name="minIdle" value="0" />
        <!-- 获取连接最大等待时间 -->
        <property name="maxWait" value="60000" />

        <!-- 是否缓存preparedStatement，也就是PSCache。PSCache对支持游标的数据库性能提升巨大，比如说oracle。在mysql下建议关闭。 -->
        <!-- <property name="poolPreparedStatements" value="true" /> <property
            name="maxPoolPreparedStatementPerConnectionSize" value="33" /> -->

        <!-- 验证数据库连接有效性，要求查询语句 -->
        <property name="validationQuery" value="${validationQuery}" />
        <!-- 建议配置为true，不影响性能，并且保证安全性。申请连接的时候检测，如果空闲时间大于timeBetweenEvictionRunsMillis，执行validationQuery检测连接是否有效。 -->
        <property name="testWhileIdle" value="true" />
        <!-- 申请连接时执行validationQuery检测连接是否有效，配置true会降低性能。 -->
        <property name="testOnBorrow" value="false" />
        <!-- 归还连接时执行validationQuery检测连接是否有效，配置true会降低性能 -->
        <property name="testOnReturn" value="false" />

        <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
        <property name="timeBetweenEvictionRunsMillis" value="60000" />
        <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="25200000" />

        <!-- 对于长时间不使用的连接强制关闭 -->
        <property name="removeAbandoned" value="true" />
        <!-- 关闭超过30分钟的空闲连接，1800秒，也就是30分钟 -->
        <property name="removeAbandonedTimeout" value="1800" />
        <!-- 关闭abanded连接时输出错误日志 -->
        <property name="logAbandoned" value="true" />

        <!-- 监控数据库 -->
        <!-- <property name="filters" value="mergeStat" /> -->
        <property name="filters" value="stat" />
    </bean>

    <!-- 配置druid监控spring jdbc -->
    <bean id="druid-stat-interceptor"
          class="com.alibaba.druid.support.spring.stat.DruidStatInterceptor" />

    <bean id="druid-stat-pointcut" class="org.springframework.aop.support.JdkRegexpMethodPointcut"
          scope="prototype">
        <property name="patterns">
            <list>
                <value>spring.druid.service.*</value>
            </list>
        </property>
    </bean>
    <aop:config>
        <aop:advisor advice-ref="druid-stat-interceptor"
                     pointcut-ref="druid-stat-pointcut" />
    </aop:config>

</beans>

spring-jdbc.xml

<?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/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="jdbcTemplate " class="org.springframework.jdbc.core.JdbcTemplate">
        <constructor-arg ref="dataSource"/>
    </bean>

</beans>

spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">


    <!-- 引入项目配置文件 -->
    <bean
            class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:config.properties</value>
            </list>
        </property>
    </bean>

    <import resource="spring-druid.xml" />
    <import resource="spring-jdbc.xml" />

    <!-- 启动支持 mvc 的注解，比如  @Controller, @RequestMapping 等-->
    <mvc:annotation-driven />

    <!-- 扫描注解Bean -->
    <context:component-scan base-package="com.kangyaba">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Repository"/>
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Service"/>
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    <!-- 隐式地向 Spring 容器注册 -->
    <context:annotation-config/>


    <!-- 设置视图解析工具 -->
    <bean
            class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 设置文件前缀 -->
        <property name="prefix" value="/WEB-INF/pages/" />
        <!-- 设置文件后缀 -->
        <property name="suffix" value=".jsp" />
    </bean>


</beans>

新建如下图所示文件

IUserService：

 1 package com.kangyaba.user;
 2 
 3 import org.springframework.stereotype.Service;
 4 
 5 import java.util.Map;
 6 
 7 /**
 8  * Created by Z on 2016/12/22.
 9  */
10 @Service
11 public interface IUserService {
12     Map findUser();
13 }

UserCtrl：

 1 package com.kangyaba.user;
 2 
 3 import org.springframework.beans.factory.annotation.Autowired;
 4 import org.springframework.stereotype.Controller;
 5 import org.springframework.ui.Model;
 6 import org.springframework.web.bind.annotation.RequestMapping;
 7 import org.springframework.web.bind.annotation.RequestMethod;
 8 
 9 /**
10  * Created by Z on 2016/12/22.
11  */
12 @Controller
13 public class UserCtrl {
14     @Autowired
15     IUserService iUserService;
16 
17     @RequestMapping(value = "/finduser", method = RequestMethod.GET)
18     public String findUser(Model model) {
19         model.addAttribute("user_nickname", iUserService.findUser().get("nickname"));
20         return "user";
21     }
22 }

UserServiceImpl:

 1 package com.kangyaba.user;
 2 
 3 import org.springframework.beans.factory.annotation.Autowired;
 4 import org.springframework.jdbc.core.JdbcTemplate;
 5 import org.springframework.stereotype.Component;
 6 
 7 import java.util.Map;
 8 
 9 /**
10  * Created by Z on 2016/12/22.
11  */
12 @Component
13 public class UserServiceImpl implements IUserService {
14     @Autowired
15     JdbcTemplate jdbcTemplate;
16 
17     public Map findUser() {
18         Map<String, Object> map = jdbcTemplate.queryForMap("select * from USER where id='1'");
19         return map;
20     }
21 }

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
  <display-name>Archetype Created Web Application</display-name>

  <!-- 加载配置文件 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath*:spring-mvc.xml</param-value>
  </context-param>

  <!-- spring -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <listener>
    <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
  </listener>

  <!-- spring mvc -->
  <servlet>
    <servlet-name>springMvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    <async-supported>true</async-supported>
  </servlet>
  <servlet-mapping>
    <servlet-name>springMvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!-- druid 监控 -->
  <filter>
    <filter-name>druidWebStatFilter</filter-name>
    <filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
    <init-param>
      <param-name>exclusions</param-name>
      <param-value>/assets/*,*.css,*.js,*.gif,*.jpg,*.png,*.ico,*.eot,*.svg,*.ttf,*.woff,*.jsp,*.tpl,/druid/*</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>druidWebStatFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <servlet>
    <servlet-name>druidStatView</servlet-name>
    <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>druidStatView</servlet-name>
    <url-pattern>/druid/*</url-pattern>
  </servlet-mapping>


  <!-- log4j -->
  <context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>classpath:log4j.properties</param-value>
  </context-param>
  <context-param>
    <param-name>webAppRootKey</param-name>
    <param-value>spring-druid.root </param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
  </listener>

  <!-- 设置请求编码格式 -->
  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

user.jsp

<%--
  Created by IntelliJ IDEA.
  User: Z
  Date: 2016/12/22
  Time: 15:22
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h2>
用户昵称:${user_nickname}
</h2>
</body>
</html>

至此，已经完成了一个springmvc demo，tomcat配置省略，下面看一下运行情况：

druid:

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原文地址：https://www.cnblogs.com/6324/p/6211686.html