servletConfig对象和servletContext对象的例子

以下是servletConfig对象和servletContext对象的例子：

1. servletConfig对象的例子：

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class MyServlet extends HttpServlet {
  private String message;

  public void init() throws ServletException {
    message = "Hello World!";
  }

  public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    response.setContentType("text/html");

    // 获取servletConfig对象
    ServletConfig config = getServletConfig();

    // 从servletConfig对象中获取初始化参数
    String paramValue = config.getInitParameter("paramName");

    // 输出初始化参数和message
    PrintWriter out = response.getWriter();
    out.println("<h1>" + message + "</h1>");
    out.println("<p>Init Parameter Value: " + paramValue + "</p>");
  }

  public void destroy() {
  }
}

2. servletContext对象的例子：

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class MyServlet extends HttpServlet {
  private String message;

  public void init() throws ServletException {
    message = "Hello World!";
  }

  public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    response.setContentType("text/html");

    // 获取servletContext对象
    ServletContext context = getServletContext();

    // 从servletContext对象中获取初始化参数
    String paramValue = context.getInitParameter("paramName");

    // 输出初始化参数和message
    PrintWriter out = response.getWriter();
    out.println("<h1>" + message + "</h1>");
    out.println("<p>Init Parameter Value: " + paramValue + "</p>");
  }

  public void destroy() {
  }
}