这里有新鲜出炉的Java并发编程示例,程序狗速度看过来!
java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言,是由Sun Microsystems公司于1995年5月推出的Java程序设计语言和Java平台(即JavaEE(j2ee), JavaME(j2me), JavaSE(j2se))的总称。
下面小编就为大家带来一篇java 获取HttpRequest Header的几种方法(必看篇)。小编觉得挺不错的,现在就分享给大家,也给大家做个参考。一起跟随小编过来看看吧
在开发应用程序的过程中,如果有多个应用,通常会通过一个portal 门户来集成,这个portal 是所有应用程序的入口,用户一旦在portal 登录之后,进入另外一个系统,就需要类似的单点登录(SSO). 进入各个子系统的时候,就不需要再次登录, 当然类似的功能,你可以通过专业的单点登录软件来实现,也可以自己写数据库token 等方式来实现。其实还有一个比较简单的方法,就是通过 portal 封装已经登录过的用户的消息,写到http header 之中,然后把请求forward 到各个子系统中去,而各子系统从 http header 中获取用户名,作为是否登录过的校验或者合法的校验。
总结了几种处理http Header 的方法:
利用 HttpServletRequest
- import javax.servlet.http.HttpServletRequest;
- //...
- private HttpServletRequest request;
- //get request headers
- private Map<String, String> getHeadersInfo() {
- Map<String, String> map = new HashMap<String, String>();
- Enumeration headerNames = request.getHeaderNames();
- while (headerNames.hasMoreElements()) {
- String key = (String) headerNames.nextElement();
- String value = request.getHeader(key);
- map.put(key, value);
- }
- return map;
- }
一个典型的例子如下:
- "headers": {
- "Host": "yihaomen.com",
- "Accept-Encoding": "gzip,deflate",
- "X-Forwarded-For": "66.249.x.x",
- "X-Forwarded-Proto": "http",
- "User-Agent": "Mozilla/5.0 (compatible; Googlebot/2.1; +
- http://www.google.com/bot.html
- )",
- "X-Request-Start": "1389158003923",
- "Accept": "*/*",
- "Connection": "close",
- "X-Forwarded-Port": "80",
- "From": "googlebot(at)googlebot.com"
- }
获取 user-agent
- import javax.servlet.http.HttpServletRequest;
- //...
- private HttpServletRequest request;
- private String getUserAgent() {
- return request.getHeader("user-agent");
- }
一个典型的例子如下:
- Mozilla/5.0 (compatible; Googlebot/2.1; +
- http://www.google.com/bot.html
- )
利用 spring mvc 获取 HttpRequest Header 的例子
- import java.util.Enumeration;
- import java.util.HashMap;
- import java.util.Map;
- import javax.servlet.http.HttpServletRequest;
- import org.springframework.beans.factory.annotation.Autowired;
- import org.springframework.stereotype.Controller;
- import org.springframework.web.bind.annotation.PathVariable;
- import org.springframework.web.bind.annotation.RequestMapping;
- import org.springframework.web.bind.annotation.RequestMethod;
- import org.springframework.web.servlet.ModelAndView;
- @Controller
- @RequestMapping("/site")
- public class SiteController {
- @Autowired
- private HttpServletRequest request;
- @RequestMapping(value = "/{input:.+}", method = RequestMethod.GET)
- public ModelAndView getDomain(@PathVariable("input") String input) {
- ModelAndView modelandView = new ModelAndView("result");
- modelandView.addObject("user-agent", getUserAgent());
- modelandView.addObject("headers", getHeadersInfo());
- return modelandView;
- }
- //get user agent
- private String getUserAgent() {
- return request.getHeader("user-agent");
- }
- //get request headers
- private Map<String, String> getHeadersInfo() {
- Map<String, String> map = new HashMap<String, String>();
- Enumeration headerNames = request.getHeaderNames();
- while (headerNames.hasMoreElements()) {
- String key = (String) headerNames.nextElement();
- String value = request.getHeader(key);
- map.put(key, value);
- }
- return map;
- }
- }
也许有人会说,Http Header 是可以模拟的,那么自己可以构造一个用来欺骗这些系统, 是的,的确是这样,所以在用Http Header 来传值得时候,一定要记得,所有的请求都必须经过 portal 来处理,然后 forward 到各子系统,就不会出现这个问题了。因为portal 首先拦截用户发起的所有的请求,如果是构造的用户,在portal 的sessiion 也是没有记录的,仍然会跳转到登录页面,如果在protal 的 session 中记录,而且 Http Header 中也有记录,那么在子系统就是合法的用户,然后自己可以根据一些要求处理业务逻辑了
JSP/Java获取HTTP header信息(request)例子
- <%
- //header.jsp
- out.println("Protocol: " + request.getProtocol() + "<br>");
- out.println("Scheme: " + request.getScheme() + "<br>");
- out.println("Server Name: " + request.getServerName() + "<br>" );
- out.println("Server Port: " + request.getServerPort() + "<br>");
- out.println("Protocol: " + request.getProtocol() + "<br>");
- out.println("Server Info: " + getServletConfig().getServletContext().getServerInfo() + "<br>");
- out.println("Remote Addr: " + request.getRemoteAddr() + "<br>");
- out.println("Remote Host: " + request.getRemoteHost() + "<br>");
- out.println("Character Encoding: " + request.getCharacterEncoding() + "<br>");
- out.println("Content Length: " + request.getContentLength() + "<br>");
- out.println("Content Type: "+ request.getContentType() + "<br>");
- out.println("Auth Type: " + request.getAuthType() + "<br>");
- out.println("HTTP Method: " + request.getMethod() + "<br>");
- out.println("Path Info: " + request.getPathInfo() + "<br>");
- out.println("Path Trans: " + request.getPathTranslated() + "<br>");
- out.println("Query String: " + request.getQueryString() + "<br>");
- out.println("Remote User: " + request.getRemoteUser() + "<br>");
- out.println("Session Id: " + request.getRequestedSessionId() + "<br>");
- out.println("Request URL: " + request.getRequestURL() + "<br>");
- out.println("Request URI: " + request.getRequestURI() + "<br>");
- out.println("Servlet Path: " + request.getServletPath() + "<br>");
- out.println("Created : " + session.getCreationTime() + "<br>");
- out.println("LastAccessed : " + session.getLastAccessedTime() + "<br>");
- out.println("Accept: " + request.getHeader("Accept") + "<br>");
- out.println("Host: " + request.getHeader("Host") + "<br>");
- out.println("Referer : " + request.getHeader("Referer") + "<br>");
- out.println("Accept-Language : " + request.getHeader("Accept-Language") + "<br>");
- out.println("Accept-Encoding : " + request.getHeader("Accept-Encoding") + "<br>");
- out.println("User-Agent : " + request.getHeader("User-Agent") + "<br>");
- out.println("Connection : " + request.getHeader("Connection") + "<br>");
- out.println("Cookie : " + request.getHeader("Cookie") + "<br>");
- %>
关于request.getHeader("Referer")的说明
request.getHeader("Referer")获取来访者地址。只有通过链接访问当前页的时候,才能获取上一页的地址;否则request.getHeader("Referer")的值为Null,通过window.open打开当前页或者直接输入地址,也为Null。
以上就是小编为大家带来的java 获取HttpRequest Header的几种方法(必看篇)的全部内容了,希望对大家有所帮助,多多支持PHPERZ~
来源: http://www.phperz.com/article/17/1119/359870.html