java 获取HTTP 头部信息
java 获取HTTP 头部信息
public class TestHttpHeader extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
Enumeration names = request.getHeaderNames();
while(names.hasMoreElements()){
String name = (String)names.nextElement();
out.println("<b>" + name + ":</b>" + request.getHeader(name) + "<br />"); if(name.equals("user-agent")){
out.println("<a href='#'>"+name+":"+request.getHeader(name)+"</a><br />");
}
System.err.println(name + ":" + request.getHeader(name) + "");
}
out.flush();
out.close();
}
}
web.xml
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>TestHttpHeader</servlet-name>
<servlet-class>com.TestHttpHeader</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>TestHttpHeader</servlet-name>
<url-pattern>/servlet/TestHttpHeader</url-pattern>
</servlet-mapping>
访问地址：
http://localhost:8080/httpHeader/servlet/TestHttpHeader
输出：
host:localhost:8080
connection:keep-alive
user-agent:Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.142 Safari/535.19
user-agent:Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.142 Safari/535.19
accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
accept-encoding:gzip,deflate,sdch
accept-language:zh-CN,zh;q=0.8
accept-charset:GBK,utf-8;q=0.7,*;q=0.3
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