循循渐进01篇 HttpServlet 请求转发

set类
public class Servletset extends HttpServlet {  //继承HttpServlet  重写 dopost doget 方法
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        ServletContext context = this.getServletContext(); //获取Context
        String str = "mszoor";
        context.setAttribute("aa",str);//添加属性

        context.getRequestDispatcher("/get").forward(req,resp);//请求转发
        //显示 转发页面的数据加上转发之前的数据  直接访问本页面地址


        PrintWriter writer = resp.getWriter();//响应流
        writer.print("Hello,servlet");//写入数据

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }
}
get类

public class Servletget extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String string =(String)  this.getServletContext().getAttribute("aa");
        String url =this.getServletContext().getInitParameter("url");//获取xml 参数

        resp.setContentType("text/html");//设置响应数据格式
        resp.setCharacterEncoding("utf-8");//设置响应数据编码
        PrintWriter writer = resp.getWriter();//响应流
        writer.print("名字是："+string+"<br/>地址是："+url);


    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       doPost(req, resp);
    }
}

备注： 请求转发 访问请求类地址，显示转移类页面数据+转移前代码数据