问题描述
我正在尝试使用库 DigestUtilsAndroid 2.3.1 使用 JDK 1.6，但是在执行应用程序时出现以下错误:
I am trying to use the library DigestUtils in Android 2.3.1 using JDK 1.6, however I get the following error when executing the app:
找不到方法 org.apache.commons.codec.binary.Hex.encodeHexString，引用自方法 org.apache.commons.codec.digest.DigestUtils.shaHex
这里有堆栈跟踪:
02-03 10:25:45.153: I/dalvikvm(1230): Could not find method org.apache.commons.codec.binary.Hex.encodeHexString, referenced from method org.apache.commons.codec.digest.DigestUtils.shaHex
02-03 10:25:45.153: W/dalvikvm(1230): VFY: unable to resolve static method 329: Lorg/apache/commons/codec/binary/Hex;.encodeHexString ([B)Ljava/lang/String;
02-03 10:25:45.153: D/dalvikvm(1230): VFY: replacing opcode 0x71 at 0x0004
02-03 10:25:45.153: D/dalvikvm(1230): VFY: dead code 0x0007-0008 in Lorg/apache/commons/codec/digest/DigestUtils;.shaHex ([B)Ljava/lang/String;
02-03 10:25:45.163: D/AndroidRuntime(1230): Shutting down VM
02-03 10:25:45.163: W/dalvikvm(1230): threadid=1: thread exiting with uncaught exception (group=0x40015560)
02-03 10:25:45.173: E/AndroidRuntime(1230): FATAL EXCEPTION: main
02-03 10:25:45.173: E/AndroidRuntime(1230): java.lang.NoSuchMethodError: org.apache.commons.codec.binary.Hex.encodeHexString
02-03 10:25:45.173: E/AndroidRuntime(1230): at org.apache.commons.codec.digest.DigestUtils.md5Hex(DigestUtils.java:226)
02-03 10:25:45.173: E/AndroidRuntime(1230): at com.caumons.trainingdininghall.ConnectionProfileActivity.onCreate(ConnectionProfileActivity.java:20)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1586)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1638)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.os.Handler.dispatchMessage(Handler.java:99)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.os.Looper.loop(Looper.java:123)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.app.ActivityThread.main(ActivityThread.java:3647)
02-03 10:25:45.173: E/AndroidRuntime(1230): at java.lang.reflect.Method.invokeNative(Native Method)
02-03 10:25:45.173: E/AndroidRuntime(1230): at java.lang.reflect.Method.invoke(Method.java:507)
02-03 10:25:45.173: E/AndroidRuntime(1230): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-03 10:25:45.173: E/AndroidRuntime(1230): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-03 10:25:45.173: E/AndroidRuntime(1230): at dalvik.system.NativeStart.main(Native Method)
导致异常的代码行是:
String hash = DigestUtils.shaHex("textToHash");
我已经在 Android 之外的 Java 类中执行了相同的代码，并且可以正常工作！所以，我不知道为什么在使用 Android 时它不起作用......我将 libraty 放在我的应用程序中的一个新 libs/文件夹中并更新了 BuildPath 以使用它.如果我尝试使用 md5 而不是 sha1，我会得到相同的异常.任何帮助，将不胜感激！谢谢.
I have executed the same code in a Java class outside Android and it works! So, I do not know why when working with Android it does not work... I put the libraty inside a new libs/ folder in my app and updated the BuildPath to use it. If I try to use md5 instead of sha1 I get the same exception. Any help would be appreciated! Thank you.
更新:
由于这是一个非常活跃的问题，我已将接受的答案更改为支持@DA25，因为他的解决方案很简单，而且大量的赞成票证明它有效.
As this is a very active question, I've changed the accepted answer in favour of @DA25, as his solution is straightforward and the high number of upvotes prove that it works.
推荐答案
我在尝试在我的 Android 应用中使用 DigestUtils 时遇到了同样的问题.这是我可以通过搜索找到的最佳答案，但我不愿意在命名空间更改的情况下重建 .jar 文件.在这个问题上花了一些时间后，我找到了一种更简单的方法来解决我的案例问题.我的代码的问题陈述是
I ran into the same issue trying to use DigestUtils in my Android app. This was the best answer I could find by searching, but I was reluctant to rebuild the .jar file with the namespace changed. After spending some time on this issue, I found an easier way to solve the problem for my case. The problem statement for my code was
String s = DigestUtils.md5Hex(data);
将此语句替换为以下内容，它将起作用:
Replace this statement with the following and it will work:
String s = new String(Hex.encodeHex(DigestUtils.md5(data)));
同样，对于 shaHex 示例，您可以将其更改为
Similarly, for shaHex exampl, you can change it to
String hash = new String(Hex.encodeHex(DigestUtils.sha("textToHash")));
这是有效的，因为即使 Android 没有 encodeHexString()，它也有 encodeHex().希望这能帮助遇到同样问题的其他人.
This works because even though Android does not have encodeHexString(), it does have encodeHex(). Hope this would help others who run into the same issue.
这篇关于在 Android 中使用 DigestUtils 找不到方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！