摘要：　　　　
　　1.Java的默认编码
内容：

1.Java的默认编码　

java的src.zip包中的java.nio.charset.Charset类中defaultCharset()方法说明java的编码类型是有jvm的file.encoding参数决定的，如果未指定默认是UTF-8

/**
 * Returns the default charset of this Java virtual machine.
 *
 * <p> The default charset is determined during virtual-machine startup and
 * typically depends upon the locale and charset of the underlying
 * operating system.
 *
 * @return  A charset object for the default charset
 *
 * @since 1.5
 */
public static Charset defaultCharset() {
    if (defaultCharset == null) {
        synchronized (Charset.class) {
            String csn = AccessController.doPrivileged(
                new GetPropertyAction("file.encoding"));
            Charset cs = lookup(csn);
            if (cs != null)
                defaultCharset = cs;
            else
                defaultCharset = forName("UTF-8");
        }
    }
    return defaultCharset;
}

Java的默认编码