学步园

使用spring下的JdkVersion.java文件获取当然jdk版本信息。

JdkVersion.java代码：

package org.springframework.core;<br /> /**<br /> * Internal helper class used to find the Java/JVM version<br /> * that Spring is operating on, to allow for automatically<br /> * adapting to the present platform's capabilities.<br /> *<br /> * <p>Note that Spring requires JVM 1.5 or higher, as of Spring 3.0.<br /> *<br /> * @author Rod Johnson<br /> * @author Juergen Hoeller<br /> * @author Rick Evans<br /> */<br /> public abstract class JdkVersion {<br /> /**<br /> * Constant identifying the 1.3.x JVM (JDK 1.3).<br /> */<br /> public static final int JAVA_13 = 0;<br /> /**<br /> * Constant identifying the 1.4.x JVM (J2SE 1.4).<br /> */<br /> public static final int JAVA_14 = 1;<br /> /**<br /> * Constant identifying the 1.5 JVM (Java 5).<br /> */<br /> public static final int JAVA_15 = 2;<br /> /**<br /> * Constant identifying the 1.6 JVM (Java 6).<br /> */<br /> public static final int JAVA_16 = 3;<br /> /**<br /> * Constant identifying the 1.7 JVM (Java 7).<br /> */<br /> public static final int JAVA_17 = 4;<br /> private static final String javaVersion;<br /> private static final int majorJavaVersion;<br /> static {<br /> javaVersion = System.getProperty("java.version");<br /> // version String should look like "1.4.2_10"<br /> if (javaVersion.contains("1.7.")) {<br /> majorJavaVersion = JAVA_17;<br /> }<br /> else if (javaVersion.contains("1.6.")) {<br /> majorJavaVersion = JAVA_16;<br /> }<br /> else {<br /> // else leave 1.5 as default (it's either 1.5 or unknown)<br /> majorJavaVersion = JAVA_15;<br /> }<br /> }<br /> /**<br /> * Return the full Java version string, as returned by<br /> * <code>System.getProperty("java.version")</code>.<br /> * @return the full Java version string<br /> * @see System#getProperty(String)<br /> */<br /> public static String getJavaVersion() {<br /> return javaVersion;<br /> }<br /> /**<br /> * Get the major version code. This means we can do things like<br /> * <code>if (getMajorJavaVersion() < JAVA_14)</code>.<br /> * @return a code comparable to the JAVA_XX codes in this class<br /> * @see #JAVA_13<br /> * @see #JAVA_14<br /> * @see #JAVA_15<br /> * @see #JAVA_16<br /> * @see #JAVA_17<br /> */<br /> public static int getMajorJavaVersion() {<br /> return majorJavaVersion;<br /> }<br /> /**<br /> * Convenience method to determine if the current JVM is at least Java 1.4.<br /> * @return <code>true</code> if the current JVM is at least Java 1.4<br /> * @deprecated as of Spring 3.0 which requires Java 1.5+<br /> * @see #getMajorJavaVersion()<br /> * @see #JAVA_14<br /> * @see #JAVA_15<br /> * @see #JAVA_16<br /> * @see #JAVA_17<br /> */<br /> @Deprecated<br /> public static boolean isAtLeastJava14() {<br /> return true;<br /> }<br /> /**<br /> * Convenience method to determine if the current JVM is at least<br /> * Java 1.5 (Java 5).<br /> * @return <code>true</code> if the current JVM is at least Java 1.5<br /> * @deprecated as of Spring 3.0 which requires Java 1.5+<br /> * @see #getMajorJavaVersion()<br /> * @see #JAVA_15<br /> * @see #JAVA_16<br /> * @see #JAVA_17<br /> */<br /> @Deprecated<br /> public static boolean isAtLeastJava15() {<br /> return true;<br /> }<br /> /**<br /> * Convenience method to determine if the current JVM is at least<br /> * Java 1.6 (Java 6).<br /> * @return <code>true</code> if the current JVM is at least Java 1.6<br /> * @deprecated as of Spring 3.0, in favor of reflective checks for<br /> * the specific Java 1.6 classes of interest<br /> * @see #getMajorJavaVersion()<br /> * @see #JAVA_16<br /> * @see #JAVA_17<br /> */<br /> @Deprecated<br /> public static boolean isAtLeastJava16() {<br /> return (majorJavaVersion >= JAVA_16);<br /> }<br /> }<br />  

GetJdkVersion.java代码：

public class GetJdkVersion {<br /> @SuppressWarnings("static-access")<br /> public static void main(String[] args) {<br /> JdkVersion jdkVersion = new JdkVersion() {<br /> };<br /> System.out.println(jdkVersion.getJavaVersion());<br /> }<br /> }

测试信息：1.6.0_23