spring2.5使用jdk1.7及以上解决办法

1、在项目中创建一个package为org.springframework.core 

2、在该package下面新建JdkVersion.java，内容如下：

package org.springframework.core;
/**
 * 修复spring2.5 使用jdk1.7或者1.8报错(only available on JDK 1.5 and higher)的问题
 * @author VULCAN
 *
 */
public abstract class JdkVersion {
    public static final int JAVA_13 = 0;
    public static final int JAVA_14 = 1;
    public static final int JAVA_15 = 2;
    public static final int JAVA_16 = 3;
    public static final int JAVA_17 = 4;
    //for jre 1.8
    public static final int JAVA_18 = 5;
    private static final String javaVersion = System
            .getProperty("java.version");
    private static final int majorJavaVersion;
    public static String getJavaVersion() {
        return javaVersion;
    }
    public static int getMajorJavaVersion() {
        return majorJavaVersion;
    }
    public static boolean isAtLeastJava14() {
        return true;
    }
    public static boolean isAtLeastJava15() {
        return getMajorJavaVersion() >= 2;
    }
    public static boolean isAtLeastJava16() {
        return getMajorJavaVersion() >= 3;
    }
    static {
        //for jre 1.8
        if (javaVersion.indexOf("1.8.") != -1) {
            majorJavaVersion = 5;
        }else if (javaVersion.indexOf("1.7.") != -1) {
            majorJavaVersion = 4;
        } else if (javaVersion.indexOf("1.6.") != -1) {
            majorJavaVersion = 3;
        } else if (javaVersion.indexOf("1.5.") != -1) {
            majorJavaVersion = 2;
        } else {
            majorJavaVersion = 1;
        }
    }
}

看了一个博客说要把编译以后的class文件 spring-core-2.5.6.jar拷贝出来打开，然后将JdkVersion.class替换jar包中的该文件。 

但是我测试了,完全不用,这样写好了以后就可以了!