HttpServletRequest常用方法介绍

为什么80%的码农都做不了架构师？>>>   

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<String> 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

转载于:https://my.oschina.net/qkmc/blog/778124