request.setCharacterEncoding("utf-8");        //设置请求的字符集,用户提交到servlet的数据以utf-8的形式

 

String user = request.getParameter("user");      //获取用户提交的数据.

 

String contentPath = request.getContextPath();获取项目的根目录!

 

Enumeration<String> en = request.getHeaderNames();  //获取请求头名称,是一组枚举数据,类型为String

 

String s = request.getHeader(obj.toString());   //通过头名称获取到请求的头.

 

以下是示例代码:

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {		request.setCharacterEncoding("utf-8");		String user = request.getParameter("user");		System.out.println("user" + user);		int contentLength = request.getContentLength();		System.out.println("contentLength:" + contentLength);		String contentType = request.getContentType();		String contentPath = request.getContextPath();		System.out.println("contentType:" + contentType + "contentPath: " + contentPath);		Enumeration
    
      en = request.getHeaderNames();		while(en.hasMoreElements()){			Object obj = en.nextElement();			String s = request.getHeader(obj.toString());			System.out.println("obj=" + obj.toString() + "s= "+s);		}	}
    

以下是输出信息:

userruankun

contentLength:-1 contentType:null    contentPath: /mytb obj=hosts= localhost:8080 obj=user-agent          s= Mozilla/5.0 (Windows NT 6.1; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0 obj=accept             s= text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 obj=accept-language              s= zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3 obj=accept-encoding            s= gzip, deflate obj=referer            s= http://localhost:8080/mytb/ obj=connection             s= keep-alive obj=upgrade-insecure-requests               s= 1