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< li class = "toctree-l3" > < a class = "reference internal" href = "#id1" > 参数说明< / a > < / li >
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< a href = "https://github.com/alibaba/arthas/blob/master/site/src/site/sphinx/redefine.md" class = "fa fa-github" > Edit on GitHub< / a >
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< h1 > redefine< a class = "headerlink" href = "#redefine" title = "永久链接至标题" > ¶< / a > < / h1 >
< blockquote >
< div > < p > 加载外部的< code class = "docutils literal notranslate" > < span class = "pre" > .class< / span > < / code > 文件， < / p >
< / div > < / blockquote >
< p > 参考：< a class = "reference external" href = "https://docs.oracle.com/javase/8/docs/api/java/lang/instrument/Instrumentation.html#redefineClasses-java.lang.instrument.ClassDefinition...-" > Instrumentation#redefineClasses< / a > < / p >
< blockquote >
< div > < p > 注意， redefine后的原来的类不能恢复， （ ） ， < / p >
< / div > < / blockquote >
< div class = "section" id = "id1" >
< h2 > 参数说明< a class = "headerlink" href = "#id1" title = "永久链接至标题" > ¶< / a > < / h2 >
< table border = "1" class = "docutils" >
< thead >
< tr >
< th align = "right" > 参数名称< / th >
< th align = "left" > 参数说明< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td align = "right" > [c:]< / td >
< td align = "left" > ClassLoader的hashcode< / td >
< / tr >
< tr >
< td align = "right" > [p:]< / td >
< td align = "left" > 外部的< code > .class< / code > 文件的完整路径，支持多个< / td >
< / tr >
< / tbody >
< / table > < / div >
< div class = "section" id = "id2" >
< h2 > 使用参考< a class = "headerlink" href = "#id2" title = "永久链接至标题" > ¶< / a > < / h2 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > redefine /tmp/Test.class
redefine -c 327a647b /tmp/Test.class /tmp/Test\$Inner.class< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "jad-mc" >
< h2 > 结合 jad/mc 命令使用< a class = "headerlink" href = "#jad-mc" title = "永久链接至标题" > ¶< / a > < / h2 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > jad --source-only com.example.demo.arthas.user.UserController > /tmp/UserController.java
mc /tmp/UserController.java -d /tmp
redefine /tmp/com/example/demo/arthas/user/UserController.class< / pre > < / div >
< / div >
< ul class = "simple" >
< li > < p > jad命令反编译， ， < / p > < / li >
< li > < p > mc命令来内存编译修改过的代码< / p > < / li >
< li > < p > 用redefine命令加载新的字节码< / p > < / li >
< / ul >
< / div >
< div class = "section" id = "class" >
< h2 > 上传 .class 文件到服务器的技巧< a class = "headerlink" href = "#class" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > 使用< code class = "docutils literal notranslate" > < span class = "pre" > mc< / span > < / code > 命令来编译< code class = "docutils literal notranslate" > < span class = "pre" > jad< / span > < / code > 的反编译的代码有可能失败。可以在本地修改代码，编译好后再上传到服务器上。有的服务器不允许直接上传文件，可以使用< code class = "docutils literal notranslate" > < span class = "pre" > base64< / span > < / code > 命令来绕过。< / p >
< ol >
< li > < p > 在本地先转换< code class = "docutils literal notranslate" > < span class = "pre" > .class< / span > < / code > 文件为base64， < / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > base64 < Test.class > result.txt< / pre > < / div >
< / div >
< / li >
< li > < p > 到服务器上，新建并编辑< code class = "docutils literal notranslate" > < span class = "pre" > result.txt< / span > < / code > ，复制本地的内容，粘贴再保存< / p > < / li >
< li > < p > 把服务器上的 < code class = "docutils literal notranslate" > < span class = "pre" > result.txt< / span > < / code > 还原为< code class = "docutils literal notranslate" > < span class = "pre" > .class< / span > < / code > < / p >
< div class = "highlight-default notranslate" > < pre class = "literal-block" > base64 -d < result.txt > Test.class< / pre >
< / div >
< / li >
< li > < p > 用md5命令计算哈希值， < / p > < / li >
< / ol >
< / div >
< div class = "section" id = "id3" >
< h2 > redefine的限制< a class = "headerlink" href = "#id3" title = "永久链接至标题" > ¶< / a > < / h2 >
< ul >
< li > < p > 不允许新增加field/method< / p > < / li >
< li > < p > 正在跑的函数，没有退出不能生效，比如下面新增加的< code class = "docutils literal notranslate" > < span class = "pre" > System.out.println< / span > < / code > ，只有< code class = "docutils literal notranslate" > < span class = "pre" > run()< / span > < / code > 函数里的会生效< / p >
< div class = "highlight-java notranslate" > < div class = "highlight hljs" > < pre class = "java" > public class MathGame {
public static void main(String[] args) throws InterruptedException {
MathGame game = new MathGame();
while (true) {
game.run();
TimeUnit.SECONDS.sleep(1);
// 这个不生效，因为代码一直跑在 while里
System.out.println(" in loop" );
}
}
public void run() throws InterruptedException {
// 这个生效，
System.out.println(" call run()" );
try {
int number = random.nextInt();
List< Integer> primeFactors = primeFactors(number);
print(number, primeFactors);
} catch (Exception e) {
System.out.println(String.format(" illegalArgumentCount:%3d, " , illegalArgumentCount) + e.getMessage());
}
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