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服务器运作的状态,修改Spring中的applicationContext.xml配置文件

2012-09-13 
服务器运行的状态,修改Spring中的applicationContext.xml配置文件最近在做一个项目,需要访问多个数据库,而

服务器运行的状态,修改Spring中的applicationContext.xml配置文件
最近在做一个项目,需要访问多个数据库,而且需要在服务器运行不重新启动的情况下,动态的修改spring中配置的数据源datasource,在网上找了很多资料,最后找到了适合我的方法,下面总结一下。
spring的配置文件是在容器启动的时候就加载到内存中的,如果手动改了application.xml,我们必须要重新启动服务器配置文件才会生效。而在spring中提供了一个类WebApplicationContext,这个类可以让你获得一些bean,可以修改内存中的信息,我就是通过这个类来实现的。下面是我具体的代码。

package com.southdigital.hospital;

import java.io.IOException;

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.mchange.v2.c3p0.ComboPooledDataSource;

public class ChangeSpringConfig extends HttpServlet
{

private String ipAddress = "127.0.0.1";

/**
* 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
{
doPost(request, response);
}

/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @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 doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
//先取得servleContext对象,提供给spring的WebApplicationUtils来动态修改applicationContext.xml

ipAddress = request.getParameter("ipAddress");
System.out.println(ipAddress);

ServletContext servletContext = this.getServletContext();
WebApplicationContext applicationContext = WebApplicationContextUtils.getWebApplicationContext(servletContext);
    ComboPooledDataSource cpds = (ComboPooledDataSource) applicationContext.getBean("dataSource");
    cpds.setJdbcUrl("jdbc:mysql://"+ipAddress+":3306/ssh");

}

}
注意:通过这种方法修改applicationContext.xml文件的时候用c3p0,而不可以用dbcp,dbcp不支持动态修改读取到内存里面的数据。


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