获取tomcat中web.xml中定义的环境变量(env-entry)

2015-10-06

import java.io.IOException;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 获取tomcat下应用的web.xml文件中的env-entry
 * 本例获取的原定义为：
 * 	<env-entry>
		<env-entry-name>solr/home</env-entry-name>
		<env-entry-value>F:/developer/solr-tomcat/solr</env-entry-value>
		<env-entry-type>java.lang.String</env-entry-type>
	</env-entry>
	
 * @author larry
 *
 */
public class TestServlet extends HttpServlet {
	/**
	 * 
	 */
	private static final long serialVersionUID = -796123516638912971L;

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		try {
			
			Context c = new InitialContext();
			String home = (String)c.lookup("java:comp/env/solr/home");
			System.out.println("solr-home:" + home);
			
		} catch (NamingException e) {
			e.printStackTrace();
		}
		
	}

}


 <env-entry>  
02.    <env-entry-name>DEFAULTDBNAME</env-entry-name>  
03.    <env-entry-value>TESTDB</env-entry-value>  
04.    <env-entry-type>java.lang.String</env-entry-type>  
05.</env-entry>

JSP:

servlet:

public void doPost(HttpServletRequest request, HttpServletResponse response)
02.            throws ServletException, IOException {
03.        try {
04.            Context c = new InitialContext();
05.            String home = (String) c.lookup("java:comp/env/DEFAULTDBNAME");
06.            System.out.println("solr-home:" + home);
07.        } catch (NamingException e) {
08.            e.printStackTrace();
09.        }
10.    }

posted @ 2017-05-05 14:52 sky20080101 阅读(1036) 评论(0) 收藏举报

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获取tomcat中web.xml中定义的环境变量(env-entry)

获取tomcat中web.xml中定义的环境变量(env-entry)

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