Servlet中获取来源URL

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JAVA EE

Servlet Scheme JSP HTML

在Servlet中获取来源URL，即发送当前请求的URL。比如从a.jsp进入Servlet，在Servlet中可以获得a.jsp的路径。以下是代码：

Java代码
public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    request.setCharacterEncoding("utf-8");
    response.setContentType("text/html;charset=utf-8");
    PrintWriter out = response.getWriter();
    out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
    out.println("<HTML>");
    out.println(" <HEAD><TITLE>请求来源</TITLE></HEAD>");
    out.println(" <BODY>");
    String fromURL = request.getHeader("Referer");
    out.print("来源于："+fromURL);
    StringBuffer requestURL = request.getRequestURL();
    String queryString = request.getQueryString();
    if(queryString != null){
        requestURL .append("?").append(queryString);
    }
    out.print("<br />请求："+requestURL.toString());
    out.println(" </BODY>");
    out.println("</HTML>");
    out.flush();
    out.close();
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>请求来源</TITLE></HEAD>");
out.println(" <BODY>");
String fromURL = request.getHeader("Referer");
out.print("来源于："+fromURL);
StringBuffer requestURL = request.getRequestURL();
String queryString = request.getQueryString();
if(queryString != null){
requestURL .append("?").append(queryString);
}
out.print("<br />请求："+requestURL.toString());
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
} 从代码中可以看出获取来源URL，是通过获取HTTP头的方式得到的,代码中String fromURL = request.getHeader("Referer"); 语句。而request.getRequestURL()是获取请求的URL，不包括参数。request.getQueryString()用于获取参数信息。

以下附录在编程常要获取的,包括获取一些常用的HTTP头：

Java代码

out.println("Protocol: " + request.getProtocol());    
out.println("Scheme: " + request.getScheme());    
out.println("Server Name: " + request.getServerName() );    
out.println("Server Port: " + request.getServerPort());    
out.println("Protocol: " + request.getProtocol());    
out.println("Server Info: " + getServletConfig().getServletContext().getServerInfo());    
out.println("Remote Addr: " + request.getRemoteAddr());    
out.println("Remote Host: " + request.getRemoteHost());    
out.println("Character Encoding: " + request.getCharacterEncoding());    
out.println("Content Length: " + request.getContentLength());    
out.println("Content Type: "+ request.getContentType());    
out.println("Auth Type: " + request.getAuthType());    
out.println("HTTP Method: " + request.getMethod());    
out.println("Path Info: " + request.getPathInfo());    
out.println("Path Trans: " + request.getPathTranslated());    
out.println("Query String: " + request.getQueryString());    
out.println("Remote User: " + request.getRemoteUser());    
out.println("Session Id: " + request.getRequestedSessionId());    
out.println("Request URI: " + request.getRequestURI());    
out.println("Servlet Path: " + request.getServletPath());    
out.println("Accept: " + request.getHeader("Accept"));    
out.println("Host: " + request.getHeader("Host"));    
out.println("Referer : " + request.getHeader("Referer"));    
out.println("Accept-Language : " + request.getHeader("Accept-Language"));    
out.println("Accept-Encoding : " + request.getHeader("Accept-Encoding"));    
out.println("User-Agent : " + request.getHeader("User-Agent"));    
out.println("Connection : " + request.getHeader("Connection"));    
out.println("Cookie : " + request.getHeader("Cookie"));    
out.println("Created : " + session.getCreationTime());    
out.println("LastAccessed : " + session.getLastAccessedTime());

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2009-11-10 10:51
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