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  • 关于servelet入门介绍

    servelet 容器 

    将前台的请求转发给后台        接受 http 表单, 后台处理操作数据库并且放回用户 。(粗劣)

    1, 继承httpservlet 

    2, 重写 doGet() , doPost()

    3, 在web.xml 中注册servlet

    目录结构:

     第一个servlet类

    import java.io.IOException;
    import java.io.PrintWriter;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    public class HelloServlet extends HttpServlet {
    
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 1L;
    
    	@Override
    	protected void doGet(HttpServletRequest req, HttpServletResponse resp) 
            throws ServletException, IOException {
    		
    		System.out.println("处理get");
    		
    		PrintWriter out = resp.getWriter();
    		resp.setContentType("text/html;charset=utf-8");
    		out.println("<strong> i know </strong>");
    		
    	}
    
    	@Override
    	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
              throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		System.out.println("处理post method");
    		PrintWriter out = resp.getWriter();
    		
    		String str = "username: " + req.getParameter("username") + "
    "
    					+ "password: " + req.getParameter("password");
    		
    		out.println(str);
    		
    	}
    
    }
    

      

    1, 当编写的servlet接受的是 get 方法, 就会调用 doGet 方法处理

    2, 当servlet 接受的是 post 方法, 就会调用 doPost 方法。

    获取请求表单里的数据 :

      request,getParameter("name");

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  • 原文地址:https://www.cnblogs.com/lijins/p/10047364.html
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