wuheng
/
vip21-javaweb


			
				
					
						
						
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							package com.lovecoding.xml.servlet;

import javax.servlet.*;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * 假设说我在这里写业务代码
 * 我们最终要展示给用户看
 * 那么用户呢 只能看到 JSP 页面的HTML
 */

public class DemoServlet implements Servlet {

    public void test(ServletResponse servletResponse) throws IOException {
        /**
         * 我们只需要在 web.xml 里面定义 URL 匹配路径 并指定Servlet 处理类
         * 我们就可以接到前端的请求, web.xml 是Tomcat的配置档
         */
        //System.out.println( "OK" );
        //System.out.println( "我是中国人" );
        PrintWriter writer = servletResponse.getWriter();
        String msg = "<html> <body><h1> HELLO SERVLET!!!! </h1></body> </html>";
        writer.print(msg);
    }

    @Override
    public void init(ServletConfig servletConfig) throws ServletException {
        System.out.println( "ServLet 初始化" );
    }
    @Override
    public ServletConfig getServletConfig() {
        System.out.println( "ServLet 取配置档" );
        return null;
    }
    @Override
    public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
        System.out.println( "ServLet 处理业务消息" );
        test(servletResponse);
    }
    @Override
    public String getServletInfo() {
        System.out.println( "ServLet 获取Servlet信息" );
        return null;
    }
    @Override
    public void destroy() {
        System.out.println( "ServLet 销毁" );
    }
}