如何获取请求标头，远程地址和其他HttpServletRequest特定信息? [英] How to obtain request headers, remote address and other HttpServletRequest-specific information?

问题描述

我有一个JSF 2.0 Web项目，我的Web有一个表单，它必须这样做:

I have a JSF 2.0 web project, my web have a form and it have to do:

1. 获取表单的参数并将其保存在Bean中(完成)

1. Get the parametres of the form and save it in a Bean (Done)

从servlet获取此信息:

Get this information from the servlet:

• 远程地址:
• 远程主机:
• 语言环境:
• 内容类型:
• 边界:
• 内容长度:
• 字符编码:
  
  

• Remote Address:
• Remote Host:
• Locale:
• Content Type:
• Boundary:
• Content Length:
• Character Encoding:
  
  

将Bean数据和Servlet数据插入数据库表中(等待步骤2)

Insert the Bean data and Servlet data in a table of a database (waiting step 2)

我对JSF中的Servlet知之甚少，我是否需要制作一个就不需要.我只有这样的代码，但是在JSP中:

I dont know much about Servlets in JSF, i dont need if i have to make one or not. I only have the code of that but in JSP:

    String informe="";
    Enumeration a = request.getHeaderNames();
    while(a.hasMoreElements() ){
        String h = a.nextElement().toString();
        informe += h+": "+request.getHeader(h)+"\n";
    }
    a = request.getAttributeNames();
    while(a.hasMoreElements() ){
        String h = a.nextElement().toString();
        informe += h+": "+request.getHeader(h)+"\n";
    }
    informe += "Remote Address: "+request.getRemoteAddr()+"\n";
    informe += "Remote Host: "+request.getRemoteHost()+"\n";
    informe += "Locale: "+request.getLocale()+"\n";
    informe += "Content Type: "+request.getContentType()+"\n";
    informe += "Content Length: "+request.getContentLength()+"\n";
            .....
            ..

我不知道如何在JSF中获得请求信息以及必须执行的步骤.我读了很多书，但我认为我并不需要他们做的所有事情.

I don't know how I can get the request information in JSF and wich steps I have to do. I readed a lot of pages but I think that I don't need all things that they do.

推荐答案

HttpServletRequest对象在JSF中，可通过

The HttpServletRequest object is in JSF available by ExternalContext#getRequest().

ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();
HttpServletRequest request = (HttpServletRequest) externalContext.getRequest();
// ...

ExternalContext 方式还提供了一些直接的方法来获取所需的信息.在getRequestXxx()开头的方法，例如getRequestHeaderMap()，getRequestContentType()等. html"rel =" nofollow> javadoc .

The ExternalContext by the way also offers some direct methods to get the desired information. Check the methods starting with getRequestXxx() such as getRequestHeaderMap(), getRequestContentType(), etc in the javadoc.

您不需要其他servlet. JSF已经将FacesServlet作为唯一的请求/响应控制器.

You don't need another servlet for this. JSF has already the FacesServlet as the sole request/response controller.

这篇关于如何获取请求标头，远程地址和其他HttpServletRequest特定信息?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！