spring-DataSource

spring支持的dataSource有好多，

　　如：自带的org.springframework.jdbc.datasource.DriverManagerDataSource

　　　　ibatis、c3p0、JDBC、hibernate等等；

首先看第一种，使用自带的datasource：

 1、项目结构

　　

　　提示：spring的jar需要放在WEB-INF的lib目录下，只是放在项目的liberaries中会报错！原因：不同的类加载器加载类的时候寻找的是不同路径下的类。

2、web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    
    <!-- 编码过滤器 -->
    <filter>
        <filter-name>EncodeFilter</filter-name>
        <filter-class>com.pt.filter.EncodeFileter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>EncodeFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <!-- 用户管理servlet -->
    <servlet>
        <servlet-name>userManager</servlet-name>
        <servlet-class>com.pt.UserManager</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>userManager</servlet-name>
        <url-pattern>/user</url-pattern>
    </servlet-mapping>
    <welcome-file-list>
      <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    
    <!-- 自动加载spring配置文件 -->
    <context-param>
        <!-- 配置文件路径 -->
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext*.xml</param-value>
    </context-param>
    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>
</web-app>
web.xml

3、spring的配置文件

<?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-2.5.xsd">
    
    <!-- 配置数据源 -->
    <bean name="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />  
        <property name="url" value="jdbc:mysql://192.168.61.28:3306/test" />  
        <property name="username" value="encysys48" />     
        <property name="password" value="encysys48" /> 
    </bean>
    
    <bean id = "user" class = "com.pt.Users" scope="singleton"> </bean>

</beans>
applicationContext.xml

4、spring的datasource的使用

package com.pt;

import java.io.IOException;
import java.sql.Connection;
import java.sql.Statement;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;

import org.springframework.context.ApplicationContext;
import org.springframework.web.context.ContextLoader;


public class UserManager extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        doPost(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        resp.setCharacterEncoding("GBK");
        //获取spring上下文
        ApplicationContext ctx = ContextLoader.getCurrentWebApplicationContext();
        DataSource ds = (DataSource)ctx.getBean("dataSource");
        Connection conn=null;
        Statement stmt = null;
        try{
            conn=ds.getConnection();
            stmt = conn.createStatement();
            if(conn!=null){
                resp.getWriter().write("获取connection成功");
                resp.getWriter().write("
");
            }else{
                resp.getWriter().write("获取connection失败");
                resp.getWriter().write("
");
            }
            String sql = "insert into users(id,name) values('2012001','陶伟基')";
            stmt.executeUpdate(sql);
        }catch(Exception ex){
            
        }finally{
            try{
                conn.close();
                stmt.close();
            }catch(Exception ex){
                
            }
        }
        
        
        
        
        resp.getWriter().write("测试成功");
    }

}
UserManager.java

5、过滤器

package com.pt.filter;
import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class EncodeFileter implements Filter {

    public void destroy() {
        // TODO Auto-generated method stub
        
    }

    public void doFilter(ServletRequest arg0, ServletResponse arg1,
            FilterChain arg2) throws IOException, ServletException {
        // TODO Auto-generated method stub
        System.out.println("进入编码过滤器");
        arg0.setCharacterEncoding("UTF-8");
        arg2.doFilter(arg0, arg1);
        
    }

    public void init(FilterConfig arg0) throws ServletException {
        // TODO Auto-generated method stub
        
    }

}
EncoderFilter.java

其他文件可以不用写！

二、ibatis数据源

<?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-2.5.xsd">
    
    <!-- 配置数据源 -->
    <bean id = "dataSource" name="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />  
        <property name="url" value="jdbc:mysql://192.168.61.28:3306/test" />  
        <property name="username" value="encysys48" />     
        <property name="password" value="encysys48" /> 
    </bean>
    
    <bean id="sqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean">
        <!-- 注入ibatis的配置文件 -->
        <property name="configLocations">
            <!-- 不加classpath:会出现错误 -->
            <value>classpath:SqlMapConfig.xml</value>
        </property>
        <property name="dataSource">
            <!-- 此处填写ID -->
            <ref local="dataSource"/>
        </property>
    </bean>
    
    <bean id = "user" class = "com.pt.Users" scope="singleton">
        <property name="sqlMapClient" ref="sqlMapClient" />
    </bean>

</beans>
applicationCnotext.xml
package com.pt;

import org.springframework.orm.ibatis.support.SqlMapClientDaoSupport;

public class Users extends SqlMapClientDaoSupport implements DataObjManager  {

    private int id;
    private String name;
    private static Users users;
    
    public boolean add(Object obj) {
        // TODO Auto-generated method stub
        if(obj instanceof Users)
            getSqlMapClientTemplate().update("addUser", (Users)obj);
        else
            System.out.println("输入类型错误！！！");
        return false;
    }

    public boolean deleteById(Object obj) {
        // TODO Auto-generated method stub
        return false;
    }

    public Object getById(Object obj) {
        // TODO Auto-generated method stub
        return null;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

}
Users,java
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMap      
    PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"      
    "http://ibatis.apache.org/dtd/sql-map-2.dtd">
<sqlMap>
    <typeAlias    alias = "user" type = "com.pt.Users" />
    <insert id="addUser" parameterClass="user">
        insert into users values(#id#,#name#)
    </insert>
</sqlMap>
Users.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMapConfig  
PUBLIC "-//iBATIS.com//DTD SQL Map Config 2.0//EN"  
"http://www.ibatis.com/dtd/sql-map-config-2.dtd">   
<sqlMapConfig>
    <sqlMap resource="com/pt/xml/Users.xml" />
</sqlMapConfig>
SqlMapConfig.xml
package com.pt;

import java.io.IOException;
import java.sql.Connection;
import java.sql.Statement;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;

import org.springframework.context.ApplicationContext;
import org.springframework.web.context.ContextLoader;


public class UserManager extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        doPost(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        resp.setCharacterEncoding("GBK");
        //获取spring上下文
        ApplicationContext ctx = ContextLoader.getCurrentWebApplicationContext();
        //注意，在这儿不可以自己new对象，必须由spring创建，这样ibatis才生效
        Users user = (Users)ctx.getBean("user");
        user.setId(20111907);
        user.setName("panteng");
        user.add(user);
        resp.getWriter().write("测试成功");
    }

}
UserManager.java
package com.pt;

public interface DataObjManager {
    public boolean add(Object obj);
    public boolean deleteById(Object obj);
    public Object getById(Object obj);
}
DataObjManager.java
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原文地址：https://www.cnblogs.com/tengpan-cn/p/5527195.html