ServletContext getInitParameterNames 读取全局初始变量

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工程目录结构



web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">

<servlet>
<servlet-name>ReadInitDataServletContext</servlet-name>
<servlet-class>jizuiku.web.servlet.ReadInitDataServletContext</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ReadInitDataServletContext</servlet-name>
<url-pattern>/ReadInitDataServletContext</url-pattern>
</servlet-mapping>

<context-param>
<param-name>minNum</param-name>
<param-value>10</param-value>
</context-param>

<context-param>
<param-name>count</param-name>
<param-value>100</param-value>
</context-param>

<context-param>
<param-name>maxNum</param-name>
<param-value>1000</param-value>
</context-param>

</web-app>

代码

package jizuiku.web.servlet;

import java.io.IOException;
import java.util.Enumeration;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* 读取 所有 全局初始化变量的名称和值
*
* @author 给最苦
* @version V17.10.21
*/
public class ReadInitDataServletContext extends HttpServlet {

/**
*
*/
private static final long serialVersionUID = 1L;

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
ServletContext application = this.getServletContext();
Enumeration<String> e = application.getInitParameterNames();
String name = null;
while (e.hasMoreElements()) {
name = e.nextElement();
System.out.println(name + " : " + application.getInitParameter(name));
}
}

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

}
}

效果



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