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Java Servlet 编程及应用之四

王朝java/jsp·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

HttpServlet 是从GenericServlet 继续而来,因此它具有GenericServlet 类似的方法和对象,是我们使用Servlet编程经常用到的包,它支持HTTP 的post 和 get 等方法。

编程思路:下面的例子,运行结果是输出简单地返回客户发送给服务器的请求行和头部信息,以及一些可访问的HTTP 信息等。

SnoopServlet.Java 的源代码如下:

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Enumeration;

import javax.servlet.*;

import javax.servlet.http.*;

public class SnoopServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException

{

PrintWriter out = response.getWriter();

response.setContentType("text/plain");

out.println("Snoop Servlet");

out.println();

out.println("Servlet init parameters:");

Enumeration e = getInitParameterNames();

while (e.hasMoreElements()) {

String key = (String)e.nextElement();

String value = getInitParameter(key);

out.println(" " + key + " = " + value);

}

out.println();

out.println("Context init parameters:");

ServletContext context = getServletContext();

Enumeration enum = context.getInitParameterNames();

while (enum.hasMoreElements()) {

String key = (String)enum.nextElement();

Object value = context.getInitParameter(key);

out.println(" " + key + " = " + value);

}

out.println();

out.println("Context attributes:");

enum = context.getAttributeNames();

while (enum.hasMoreElements()) {

String key = (String)enum.nextElement();

Object value = context.getAttribute(key);

out.println(" " + key + " = " + value);

}

out.println();

out.println("Request attributes:");

e = request.getAttributeNames();

while (e.hasMoreElements()) {

String key = (String)e.nextElement();

Object value = request.getAttribute(key);

out.println(" " + key + " = " + value);

}

out.println();

out.println("Servlet Name: " + getServletName());

out.println("Protocol: " + request.getProtocol());

out.println("Scheme: " + request.getScheme());

out.println("Server Name: " + request.getServerName());

out.println("Server Port: " + request.getServerPort());

out.println("Server Info: " + context.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("Locale: "+ request.getLocale());

out.println("Default Response Buffer: "+ response.getBufferSize());

out.println();

out.println("Parameter names in this request:");

e = request.getParameterNames();

while (e.hasMoreElements()) {

String key = (String)e.nextElement();

String[] values = request.getParameterValues(key);

out.print(" " + key + " = ");

for(int i = 0; i < values.length; i++) {

out.print(values[i] + " ");

}

out.println();

}

out.println();

out.println("Headers in this request:");

e = request.getHeaderNames();

while (e.hasMoreElements()) {

String key = (String)e.nextElement();

String value = request.getHeader(key);

out.println(" " + key + ": " + value);

}

out.println();

out.println("Cookies in this request:");

Cookie[] cookies = request.getCookies();

if (cookies != null) {

for (int i = 0; i < cookies.length; i++) {

Cookie cookie = cookies[i];

out.println(" " + cookie.getName() + " = "+ cookie.getValue());

}

}

out.println();

out.println("Request Is Secure: " + request.isSecure());

out.println("Auth Type: " + request.getAuthType());

out.println("HTTP Method: " + request.getMethod());

out.println("Remote User: " + request.getRemoteUser());

out.println("Request URI: " + request.getRequestURI());

out.println("Context Path: " + request.getContextPath());

out.println("Servlet Path: " + request.getServletPath());

out.println("Path Info: " + request.getPathInfo());

out.println("Path Trans: " + request.getPathTranslated());

out.println("Query String: " + request.getQueryString());

out.println();

HttpSession session = request.getSession();

out.println("Requested Session Id: " +

request.getRequestedSessionId());

out.println("Current Session Id: " + session.getId());

out.println("Session Created Time: " + session.getCreationTime());

out.println("Session Last Accessed Time: " +session.getLastAccessedTime());

out.println("Session Max Inactive Interval Seconds: " + session.getMaxInactiveInterval());

out.println();

out.println("Session values: ");

Enumeration names = session.getAttributeNames();

while (names.hasMoreElements()) {

String name = (String) names.nextElement();

out.println(" " + name + " = " + session.getAttribute(name));

}

}

}

编程技巧说明:

程序输出Init Parameters(初始化参数)、Attribute names in this request、Parameter names in this request、Headers in this request、Cookies in this request 和 Session Information等信息。

 
 
 
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