public class ConcurrentTest extends HttpServlet {
PrintWriter output;
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username;
response.setContentType("text/html;charset=gb2312");
username=request.getParameter("Username");
output=response.getWriter();
try {
//为了突出并发问题，在这设置一个延时
Thread.sleep(5000);
output.println("用户名:"+username+"<BR>");
} catch (Exception e) {
e.printStackTrace();
}
}
}部署在tomcat7上public class SimpleServlet extends HttpServlet{
// A variable that is NOT thread-safe!
private int counter = 0;
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
{
resp.getWriter().println("<HTML><BODY>");
resp.getWriter().println(this + " ==> ");
resp.getWriter().println(Thread.currentThread() + ": <br>");
for (int c = 0; c < 10; c++){
resp.getWriter().println("Counter = " + counter + "<BR>");
try {
Thread.sleep((long) Math.random() * 1000);
counter++;
}
catch (InterruptedException exc){}
}
resp.getWriter().println("</BODY></HTML>");
}
}和第一个例子似乎差不多,只是变量由PrintWriter变成了int。 <HTML>
<BODY>
<TABLE>
<TR>
<TD><IFRAME src="./SimpleServlet" name="servlet1" height="200%"> </IFRAME></TD>
</TR>
<TR>
<TD><IFRAME src="./SimpleServlet" name="servlet2" height="200%"> </IFRAME></TD>
</TR>
<TR>
<TD><IFRAME src="./SimpleServlet" name="servlet3" height="200%"> </IFRAME></TD>
</TR>
</TABLE>
</BODY>
</HTML> 在tomcat7下 结果是 参考资料
两个例子分别来自下面两个地址 详细信息大家自己去看看吧
原文：http://blog.csdn.net/dlf123321/article/details/42369817