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package com.roger.query.util;
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import org.apache.log4j.Logger;
/**
* @ 服务器类型探测
* @Date 2011/04/13
* **/
public class ServerUtil {
public static final String GERONIMO_CLASS = "/org/apache/geronimo/system/main/Daemon.class";
public static final String JBOSS_CLASS = "/org/jboss/Main.class";
public static final String JETTY_CLASS = "/org/mortbay/jetty/Server.class";
public static final String JONAS_CLASS = "/org/objectweb/jonas/server/Server.class";
public static final String OC4J_CLASS = "/oracle/jsp/oc4jutil/Oc4jUtil.class";
public static final String ORION_CLASS = "/com/evermind/server/ApplicationServer.class";
public static final String PRAMATI_CLASS = "/com/pramati/Server.class";
public static final String RESIN_CLASS = "/com/caucho/server/resin/Resin.class";
public static final String REXIP_CLASS = "/com/tcc/Main.class";
public static final String SUN7_CLASS = "/com/iplanet/ias/tools/cli/IasAdminMain.class";
public static final String SUN8_CLASS = "/com/sun/enterprise/cli/framework/CLIMain.class";
public static final String TOMCAT_CLASS = "/org/apache/catalina/startup/Bootstrap.class";
public static final String WEBLOGIC_CLASS = "/weblogic/Server.class";
public static final String WEBSPHERE_CLASS = "/com/ibm/websphere/product/VersionInfo.class";
public static String getServerId() {
ServerUtil sd = _instance;
if (sd._serverId == null) {
if (ServerUtil.isGeronimo()) {
sd._serverId = "geronimo";
} else if (ServerUtil.isJBoss()) {
sd._serverId = "jboss";
} else if (ServerUtil.isJOnAS()) {
sd._serverId = "jonas";
} else if (ServerUtil.isOC4J()) {
sd._serverId = "oc4j";
} else if (ServerUtil.isOrion()) {
sd._serverId = "orion";
} else if (ServerUtil.isResin()) {
sd._serverId = "resin";
} else if (ServerUtil.isWebLogic()) {
sd._serverId = "weblogic";
} else if (ServerUtil.isWebSphere()) {
sd._serverId = "websphere";
}
if (ServerUtil.isJetty()) {
if (sd._serverId == null) {
sd._serverId = "jetty";
} else {
sd._serverId += "-jetty";
}
} else if (ServerUtil.isTomcat()) {
if (sd._serverId == null) {
sd._serverId = "tomcat";
} else {
sd._serverId += "-tomcat";
}
}
if (_log.isInfoEnabled()) {
_log.info("Detected server " + sd._serverId);
}
if (sd._serverId == null) {
throw new RuntimeException("Server is not supported");
}
}
return sd._serverId;
}
public static boolean isGeronimo() {
ServerUtil sd = _instance;
if (sd._geronimo == null) {
Class c = sd.getClass();
if (c.getResource(GERONIMO_CLASS) != null) {
sd._geronimo = Boolean.TRUE;
} else {
sd._geronimo = Boolean.FALSE;
}
}
return sd._geronimo.booleanValue();
}
public static boolean isJBoss() {
ServerUtil sd = _instance;
if (sd._jBoss == null) {
Class c = sd.getClass();
if (c.getResource(JBOSS_CLASS) != null) {
sd._jBoss = Boolean.TRUE;
} else {
sd._jBoss = Boolean.FALSE;
}
}
return sd._jBoss.booleanValue();
}
public static boolean isJetty() {
ServerUtil sd = _instance;
if (sd._jetty == null) {
Class c = sd.getClass();
if (c.getResource(JETTY_CLASS) != null) {
sd._jetty = Boolean.TRUE;
} else {
sd._jetty = Boolean.FALSE;
}
}
return sd._jetty.booleanValue();
}
public static boolean isJOnAS() {
ServerUtil sd = _instance;
if (sd._jonas == null) {
Class c = sd.getClass();
if (c.getResource(JONAS_CLASS) != null) {
sd._jonas = Boolean.TRUE;
} else {
sd._jonas = Boolean.FALSE;
}
}
return sd._jonas.booleanValue();
}
public static boolean isOC4J() {
ServerUtil sd = _instance;
if (sd._oc4j == null) {
Class c = sd.getClass();
if (c.getResource(OC4J_CLASS) != null) {
sd._oc4j = Boolean.TRUE;
} else {
sd._oc4j = Boolean.FALSE;
}
}
return sd._oc4j.booleanValue();
}
public static boolean isOrion() {
ServerUtil sd = _instance;
if (sd._orion == null) {
Class c = sd.getClass();
if (c.getResource(ORION_CLASS) != null) {
sd._orion = Boolean.TRUE;
} else {
sd._orion = Boolean.FALSE;
}
}
return sd._orion.booleanValue();
}
public static boolean isPramati() {
ServerUtil sd = _instance;
if (sd._pramati == null) {
Class c = sd.getClass();
if (c.getResource(PRAMATI_CLASS) != null) {
sd._pramati = Boolean.TRUE;
} else {
sd._pramati = Boolean.FALSE;
}
}
return sd._pramati.booleanValue();
}
public static boolean isResin() {
ServerUtil sd = _instance;
if (sd._resin == null) {
Class c = sd.getClass();
if (c.getResource(RESIN_CLASS) != null) {
sd._resin = Boolean.TRUE;
} else {
sd._resin = Boolean.FALSE;
}
}
return sd._resin.booleanValue();
}
public static boolean isRexIP() {
ServerUtil sd = _instance;
if (sd._rexIP == null) {
Class c = sd.getClass();
if (c.getResource(REXIP_CLASS) != null) {
sd._rexIP = Boolean.TRUE;
} else {
sd._rexIP = Boolean.FALSE;
}
}
return sd._rexIP.booleanValue();
}
public static boolean isSun() {
if (isSun7() || isSun8()) {
return true;
} else {
return false;
}
}
public static boolean isSun7() {
ServerUtil sd = _instance;
if (sd._sun7 == null) {
Class c = sd.getClass();
if (c.getResource(SUN7_CLASS) != null) {
sd._sun7 = Boolean.TRUE;
} else {
sd._sun7 = Boolean.FALSE;
}
}
return sd._sun7.booleanValue();
}
public static boolean isSun8() {
ServerUtil sd = _instance;
if (sd._sun8 == null) {
Class c = sd.getClass();
if (c.getResource(SUN8_CLASS) != null) {
sd._sun8 = Boolean.TRUE;
} else {
sd._sun8 = Boolean.FALSE;
}
}
return sd._sun8.booleanValue();
}
public static boolean isTomcat() {
ServerUtil sd = _instance;
if (sd._tomcat == null) {
Class c = sd.getClass();
if (c.getResource(TOMCAT_CLASS) != null) {
sd._tomcat = Boolean.TRUE;
} else {
sd._tomcat = Boolean.FALSE;
}
}
return sd._tomcat.booleanValue();
}
public static boolean isWebLogic() {
ServerUtil sd = _instance;
if (sd._webLogic == null) {
Class c = sd.getClass();
if (c.getResource(WEBLOGIC_CLASS) != null) {
sd._webLogic = Boolean.TRUE;
} else {
sd._webLogic = Boolean.FALSE;
}
}
return sd._webLogic.booleanValue();
}
public static boolean isWebSphere() {
ServerUtil sd = _instance;
if (sd._webSphere == null) {
Class c = sd.getClass();
if (c.getResource(WEBSPHERE_CLASS) != null) {
sd._webSphere = Boolean.TRUE;
} else {
sd._webSphere = Boolean.FALSE;
}
}
return sd._webSphere.booleanValue();
}
private ServerUtil() {
}
private static Logger _log = Logger.getLogger(ServerUtil.class);
private static ServerUtil _instance = new ServerUtil();
private String _serverId;
private Boolean _geronimo;
private Boolean _jBoss;
private Boolean _jetty;
private Boolean _jonas;
private Boolean _oc4j;
private Boolean _orion;
private Boolean _pramati;
private Boolean _resin;
private Boolean _rexIP;
private Boolean _sun7;
private Boolean _sun8;
private Boolean _tomcat;
private Boolean _webLogic;
private Boolean _webSphere;
}
代码来自 javaRoger 的博客，求采纳
只要能获得三角形的三边长度，就很容易了
假设三边长度为a、b、c
先判断是否为三角形：|a-b|ca+b（三个边）
钝角、锐角用余弦定理，判断cosA（三个点）的正负性
直角用勾股定理
等腰或等边更简单
用java判断浏览器类型可以通过从request里可以获取用户浏览器类型
代码如下：
Enumeration gete = request.getHeaderNames();
while (e.hasMoreElements()) {
String name = (String)gete.nextElement();
String value = request.getHeader(name);
}
这样可以遍历从客户端传来的所有头信息：
解释说明：
request.getHeaderNames();//取得全部头信息
request.getHeader();//取出头信息内容
request.getHeaders("User-Agent"); //request.getHeader(“User-agent”)返回客户端浏览器的版本号
Scanner sc = new Scanner(System.in);
System.out.println("请输入一个整数：");
int num = sc.nextInt();
String str1 = num + "";
// String str1 = Integer.toString(num);
// String str1 = String.valueOf(num);
StringBuilder str2 = new StringBuilder(str1);
str2.reverse();
int count = 0;
for (int i = 0; i str1.length(); i++) {
if (str1.charAt(i) != str2.charAt(i)) {
System.out.println(str1 + "不是回文数");
break;
} else {
count++;
}
}
if (count == str1.length()) {
System.out.println(str1 + "是回文数");
}
望采纳