JSP中设置操作HTTP应答头
发布时间：2023-05-22 14:01:00 所属栏目：教程 来源：
导读：primenumbers.java
注意，该servlet要用到前面给出的servletutilities.java。另外还要用到：primelist.java，用于在后台线程中创建一个素数的vector；primes.java，用于随机生成biginteger类型的大数字，检
注意，该servlet要用到前面给出的servletutilities.java。另外还要用到：primelist.java，用于在后台线程中创建一个素数的vector；primes.java，用于随机生成biginteger类型的大数字，检
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primenumbers.java 注意，该servlet要用到前面给出的servletutilities.java。另外还要用到：primelist.java，用于在后台线程中创建一个素数的vector；primes.java，用于随机生成biginteger类型的大数字，检查它们是否是素数。（此处略去primelist.java和primes.java的代码。） package hall; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.*; public class primenumbers extends httpservlet { private static vector primelistvector = new vector(); private static int maxprimelists = 30; public void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { int numprimes = servletutilities.getintparameter(request, "numprimes", 50); int numdigits = servletutilities.getintparameter(request, "numdigits", 120); primelist primelist = findprimelist(primelistvector, numprimes, numdigits); if (primelist == null) { primelist = new primelist(numprimes, numdigits, true); synchronized(primelistvector) { if (primelistvector.size() ＞= maxprimelists) primelistvector.removeelementat(0); primelistvector.addelement(primelist); } } vector currentprimes = primelist.getprimes(); int numcurrentprimes = currentprimes.size(); int numprimesremaining = (numprimes - numcurrentprimes); boolean islastresult = (numprimesremaining == 0); if (!islastresult) { response.setheader("refresh", "5"); } response.setcontenttype("text/html"); printwriter out = response.getwriter(); string title = "some " + numdigits + "-digit prime numbers"; out.println(servletutilities.headwithtitle(title) + "＜body bgcolor=＼"#fdf5e6＼"＞＼n" + "＜h2 align=center＞" + title + "＜/h2＞＼n" + "＜h3＞primes found with " + numdigits + " or more digits: " + numcurrentprimes + ".＜/h3＞"); if (islastresult) out.println("＜b＞done searching.＜/b＞"); else out.println("＜b＞still looking for " + numprimesremaining + " more＜blink＞...＜/blink＞＜/b＞"); out.println("＜ol＞"); for(int i=0; i＜numcurrentprimes; i++) { out.println(" ＜li＞" + currentprimes.elementat(i)); } out.println("＜/ol＞"); out.println("＜/body＞＜/html＞"); } public void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { doget(request, response); } // 检查是否存在同类型请求（已经完成，或者正在计算）。 // 如存在，则返回现有结果而不是启动新的后台线程。 private primelist findprimelist(vector primelistvector, int numprimes, int numdigits) { synchronized(primelistvector) { for(int i=0; i＜primelistvector.size(); i++) { primelist primes = (primelist)primelistvector.elementat(i); if ((numprimes == primes.numprimes()) && (numdigits == primes.numdigits())) return(primes); } return(null); } } } primenumbers.html ＜!doctype html public "-//w3c//dtd html 4.0 transitional//en"＞ ＜html＞ ＜head＞ ＜title＞大素数计算＜/title＞ ＜/head＞ ＜center＞ ＜body bgcolor="#fdf5e6"＞ ＜form action="/servlet/hall.primenumbers"＞ ＜b＞要计算几个素数:＜/b＞ ＜input type="text" name="numprimes" value=25 size=4＞＜br＞ ＜b＞每个素数的位数:＜/b＞ ＜input type="text" name="numdigits" value=150 size=3＞＜br＞ ＜input type="submit" value="开始计算"＞ ＜/form＞ ＜/center＞ ＜/body＞ ＜/html＞ （编辑：聊城站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
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