String password = config.getInitParameter(“password”);
try {
Connection conn = DriverManager.getConnection(url,user,password);
}catch(SQLException e){
e.printStackTrace();
}
…
}
}
4.演示
创建ServletConfigDemo
package com;
import java.io.IOException;
import java.io.PrintWriter;
import j 《一线大厂Java面试题解析+后端开发学习笔记+最新架构讲解视频+实战项目源码讲义》无偿开源 威信搜索公众号【编程进阶路】 ava.util.Date;
import java.util.Enumeration;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
- Servlet implementation class ServletConfigDemo
*/
public class ServletConfigDemo extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
- @see HttpServlet#HttpServlet()
*/
public ServletConfigDemo() {
super();
// TODO Auto-generated constructor stub
}
@Override
public void init(ServletConfig config) throws ServletException {
String name = config.getInitParameter(“user”);
String pass = config.getInitParameter(“password”);
String servletName = config.getServletName();
System.out.println(“name值为：”+name);
System.out.println(“pass值为：”+pass);
System.out.println(“servletName值为：”+servletName);
Enumeration eums = config.getInitParameterNames();
while(eums.hasMoreElements()) {
String eum = eums.nextElement();
System.out.println(eum+“对应值为：”+config.getInitParameter(eum));
}
}
/**
- @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
- @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
使用web.xml的方式进行配置：
<?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_4_0.xsd”
id=“WebApp_ID” version=“4.0”>
ClassDemo03
index.html
index.htm
index.jsp
default.html
default.htm
default.jsp
myservlet
com.ServletConfigDemo
user
qst
password
123