获取httpservletrequest

获取HttpServletRequest对象可以通过以下两种方式：

1. 在Servlet的doGet()或doPost()方法中，直接将HttpServletRequest对象作为参数传入方法中，如下所示：

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    //获取HttpServletRequest对象
    HttpServletRequest req = request;
}

2. 在Servlet中，可以通过调用ServletConfig对象的getServletContext()方法获取ServletContext对象，再通过调用ServletContext对象的getRequest()方法获取HttpServletRequest对象，如下所示：

public class MyServlet extends HttpServlet {
    private ServletContext context;

    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        context = config.getServletContext();
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //获取HttpServletRequest对象
        HttpServletRequest req = context.getRequest();
    }
}