Ch01_Request

Yang Haoran 5/26/2019 Java

# Request

Post请求和get请求的区别： https://blog.csdn.net/zlczsw/article/details/91046081 (opens new window)

# Ajax & Form

https://blog.csdn.net/xiaolulululululu/article/details/78641124

# HttpServletRequest

只要每次有请求进入tomcat服务器，tomcat都会把这些信息解析好封装到Request对象中，然后传递到service方法（doget，dopost）中。

我们可以通过HttpServletRequest类获取请求的所有信息。

常用方法：

URL=协议+ip+端口+URI

注意获取多个值：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    System.out.println("URI--->" + request.getRequestURI());
    System.out.println("URL--->" + request.getRequestURL());
    System.out.println("client ip --->" + request.getRemoteHost());
    //获取请求头中的某个值
    System.out.println("header--->" + request.getHeader("User-Agent"));
    //获取参数
    System.out.println("username--->" + request.getParameter("username"));
    System.out.println("password--->" + request.getParameter("password"));
    //注意获取多个值一定要用getParamaterValues
    String[] hobby = request.getParameterValues("hobby");
    System.out.println("hobby--->" + Arrays.asList(hobby));


}