Servlet原理和Tomcat 初始化/处理请求两部分核心逻辑 | | 构造post请求

• Servlet原理
• Tomcat 的伪代码描述 Tomcat 初始化/处理请求 两部分核心逻辑
• • 初始化
  • Tomcat处理请求
• 构造post请求
• • ajax 构造 post 请求
  • • 代码
    • html代码
    • • 注意:
      • 为啥要用ajax构造post请求
  • 用form构造post请求

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;



@WebServlet("/method")
public class MethodServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("test/html; charset=utf8");//指定编码格式
        resp.getWriter().write("Post响应");
    }
}

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


@WebServlet("/postGetParameter")
public class postGetParameterServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        String username = req.getParameter("username");
        String age = req.getParameter("age");

        resp.getWriter().write("username=" + username+" " + "age=" + age);

    }
}