Spring 多数据源配置方法

1、Spring数据源配置如下： 

"1.0" encoding="UTF-8"?>
"-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">




    "ds1"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        "driverClassName" value="org.logicalcobwebs.proxool.ProxoolDriver" />
        "url" value="proxool.db1" />



    "ds2"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        "driverClassName" value="org.logicalcobwebs.proxool.ProxoolDriver" />
        "url" value="proxool.db2" />



    "ds" class="com.a8.web.core.dynads.DynamicDataSource">
        "targetDataSources">
            "java.lang.String">
                "ds1" value-ref="ds1" />
                "ds2" value-ref="ds2" />


        "defaultTargetDataSource" ref="ds1" />

2、代码继承AbstractRoutingDataSource 

import java.sql.Connection;
import java.sql.SQLException;

import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.a8.web.util.ApplicationConstantUtil;

public class DynamicDataSource extends AbstractRoutingDataSource {

    // 主数据库bean名
    private static String MASTER = "ds1";
    // 从数据库bean名
    private static String SLAVEDS = "ds2";

    @Override
    protected Object determineCurrentLookupKey() {

        String dskey = "";

        try {
            // 获取上下文
            WebApplicationContext wac = WebApplicationContextUtils
                    .getRequiredWebApplicationContext(ApplicationConstantUtil
                            .getServletContext());

            // 获取从数据库连接
            DriverManagerDataSource curr_ds = (DriverManagerDataSource) wac
                    .getBean(SLAVEDS);

            Connection conn = curr_ds.getConnection();

            if (conn.isClosed()) {
                // 主数据库
                dskey = MASTER;
            } else {
                // 从数据库
                dskey = SLAVEDS;
            }
        } catch (SQLException e1) {
            dskey = MASTER;
        }

        return dskey;
    }

}