package firstservlet;import java.util.*;/**
* <p>Title: </p>
*
* <p>Description: </p>
*
* <p>Copyright: Copyright (c) 2007</p>
*
* <p>Company: </p>
*
* @author not attributable
* @version 1.0
*/
public class ContextObject {
private List list = new ArrayList();
private MyTimer timer = null;
private boolean isCont = true; public ContextObject() {
} public void time() {
Date some = new Date();
list.add(some);
} public List getTime() {
return list;
} public void startTimeStamp() {
timer = new MyTimer();
timer.start();
} public void stopTimeStamp() {
isCont = false;
timer.interrupt();
} class MyTimer extends Thread {
public void run() {
while (isCont) {
try {
sleep(1000);
} catch (InterruptedException ex) {
interrupt();
break;
}
time();
}
}
}
}
package firstservlet;import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;import javax.servlet.*;
import javax.servlet.http.*;
import java.util.Date;/**
* <p>Title: </p>
*
* <p>Description: </p>
*
* <p>Copyright: Copyright (c) 2007</p>
*
* <p>Company: </p>
*
* @author not attributable
* @version 1.0
*/
public class SimpleServlet extends HttpServlet {
private static final String CONTENT_TYPE = "text/html; charset=gb2312"; //Initialize global variables
public void init(ServletConfig cnf) throws ServletException {
super.init(cnf);
ServletContext cnt = cnf.getServletContext();
ContextObject obj = new ContextObject();
obj.startTimeStamp();
cnt.setAttribute("obj", obj);
System.out.println("SimpleServlet.init()");
} //Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
response.setContentType(CONTENT_TYPE);
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head><title>ContextObject</title></head>");
out.println("");
out.println("<body><center>");
ServletContext cnt = getServletContext();
Object cobj = cnt.getAttribute("obj");
if (cobj != null) {
ContextObject obj = (ContextObject) cobj;
List list = obj.getTime();
writeTimeTable(out, list);
} else {
out.println("未找到 ContextObject!");
}
out.println("</center></body>");
out.println("</html>");
out.close();
} /**
* writeTimeTable
*
* @param out PrintWriter
* @param list List
*/
private void writeTimeTable(PrintWriter out, List list) {
int size = list.size();
if (size != 0) {
out.println("<table border=\"1\">");
out.println("<tr><th>次数</th><th>时间</th></tr>");
for (int i = 0; i < size; i++) {
out.println("<tr>");
out.println("<td>第" + (i + 1) + "次</td>");
out.println("<td>" + ((Date) list.get(i)).toString() + "</td>");
out.println("</tr>");
}
out.println("</table>");
} else {
out.println("无时间标记!");
}
} //Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
doGet(request, response);
} //Clean up resources
public void destroy() {
ServletContext cnt = getServletContext();
Object cobj = cnt.getAttribute("obj");
if (cobj != null) {
ContextObject obj = (ContextObject) cobj;
obj.stopTimeStamp();
cnt.removeAttribute("obj");
}
System.out.println("SimpleServlet.destroy()");
}
}<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"><web-app>
<servlet>
<servlet-name>simpleservlet</servlet-name>
<servlet-class>firstservlet.SimpleServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>simpleservlet</servlet-name>
<url-pattern>/simpleservlet</url-pattern>
</servlet-mapping>
</web-app>
* <p>Title: </p>
*
* <p>Description: </p>
*
* <p>Copyright: Copyright (c) 2007</p>
*
* <p>Company: </p>
*
* @author not attributable
* @version 1.0
*/
public class ContextObject {
private List list = new ArrayList();
private MyTimer timer = null;
private boolean isCont = true; public ContextObject() {
} public void time() {
Date some = new Date();
list.add(some);
} public List getTime() {
return list;
} public void startTimeStamp() {
timer = new MyTimer();
timer.start();
} public void stopTimeStamp() {
isCont = false;
timer.interrupt();
} class MyTimer extends Thread {
public void run() {
while (isCont) {
try {
sleep(1000);
} catch (InterruptedException ex) {
interrupt();
break;
}
time();
}
}
}
}
package firstservlet;import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;import javax.servlet.*;
import javax.servlet.http.*;
import java.util.Date;/**
* <p>Title: </p>
*
* <p>Description: </p>
*
* <p>Copyright: Copyright (c) 2007</p>
*
* <p>Company: </p>
*
* @author not attributable
* @version 1.0
*/
public class SimpleServlet extends HttpServlet {
private static final String CONTENT_TYPE = "text/html; charset=gb2312"; //Initialize global variables
public void init(ServletConfig cnf) throws ServletException {
super.init(cnf);
ServletContext cnt = cnf.getServletContext();
ContextObject obj = new ContextObject();
obj.startTimeStamp();
cnt.setAttribute("obj", obj);
System.out.println("SimpleServlet.init()");
} //Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
response.setContentType(CONTENT_TYPE);
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head><title>ContextObject</title></head>");
out.println("");
out.println("<body><center>");
ServletContext cnt = getServletContext();
Object cobj = cnt.getAttribute("obj");
if (cobj != null) {
ContextObject obj = (ContextObject) cobj;
List list = obj.getTime();
writeTimeTable(out, list);
} else {
out.println("未找到 ContextObject!");
}
out.println("</center></body>");
out.println("</html>");
out.close();
} /**
* writeTimeTable
*
* @param out PrintWriter
* @param list List
*/
private void writeTimeTable(PrintWriter out, List list) {
int size = list.size();
if (size != 0) {
out.println("<table border=\"1\">");
out.println("<tr><th>次数</th><th>时间</th></tr>");
for (int i = 0; i < size; i++) {
out.println("<tr>");
out.println("<td>第" + (i + 1) + "次</td>");
out.println("<td>" + ((Date) list.get(i)).toString() + "</td>");
out.println("</tr>");
}
out.println("</table>");
} else {
out.println("无时间标记!");
}
} //Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
doGet(request, response);
} //Clean up resources
public void destroy() {
ServletContext cnt = getServletContext();
Object cobj = cnt.getAttribute("obj");
if (cobj != null) {
ContextObject obj = (ContextObject) cobj;
obj.stopTimeStamp();
cnt.removeAttribute("obj");
}
System.out.println("SimpleServlet.destroy()");
}
}<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"><web-app>
<servlet>
<servlet-name>simpleservlet</servlet-name>
<servlet-class>firstservlet.SimpleServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>simpleservlet</servlet-name>
<url-pattern>/simpleservlet</url-pattern>
</servlet-mapping>
</web-app>
out.println("无时间标记!");
}
可我不是想执行else里的啊,我的web.xml文件写的对吗,我这里不怎么清楚
<servlet>
<servlet-name>simpleservlet</servlet-name>
<servlet-class>firstservlet.SimpleServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>这样改就可以了
加System.out.println(list);
或加加System.out.println(list.size());
打印一下list看看它是不是为空,
如果不为空,size就大于一,
就不应该出"无时间标记"了!
第1次Sat Feb 24 15:21:31 CST 2007
第2次Sat Feb 24 15:21:32 CST 2007
第3次Sat Feb 24 15:21:33 CST 2007
第4次Sat Feb 24 15:21:34 CST 2007
第5次Sat Feb 24 15:21:35 CST 2007
第6次Sat Feb 24 15:21:36 CST 2007
我不是让进程睡眠了10秒吗,那间隔应该至少10秒啊,为什么现在是一秒?
你是休息1000毫秒也就是一秒啊