问题描述
我想使用这个库<一href="http://commons.apache.org/$c$cc/apidocs/org/apache/commons/$c$cc/digest/DigestUtils.html">DigestUtils在安卓2.3.1使用JDK 1.6，但是我得到了执行应用程序时，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.en codeHexString，从方法org.apache.commons引用。codec.digest。 DigestUtils.shaHex
在这里，您有堆栈跟踪：
Here you have the stacktrace:
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$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-03 10:25:45.173: E/AndroidRuntime(1230): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-03 10:25:45.173: E/AndroidRuntime(1230): at dalvik.system.NativeStart.main(Native Method)
的code这会导致异常的行是：
The line of code which causes the exception is:
字符串哈希= DigestUtils.shaHex（textToHash）;
我执行了相同的code在安卓之外一个Java类和它的作品！所以，我不知道为什么与Android合作时，这是行不通的......我把libraty一个新的库/文件夹中我的应用程序和更新的构建路径来使用它。如果我尝试使用MD5，而不是SHA1我得到了同样的异常。任何帮助将是AP preciated！谢谢你。
I have executed the same code in a Java class outside Android and it works! So, I do not know why when working with Android it does not work... I put the libraty inside a new libs/ folder in my app and updated the BuildPath to use it. If I try to use md5 instead of sha1 I get the same exception. Any help would be appreciated! Thank you.
更新：
由于这是一个非常活跃的问题，我已经改变了公认的答案赞成@ DA25，因为他的解决办法很简单，高数upvotes的证明，它的作品。
As this is a very active question, I've changed the accepted answer in favour of @DA25, as his solution is straightforward and the high number of upvotes prove that it works.
推荐答案
我碰到了同样的问题，试图用DigestUtils在我的Android应用程序。这是我能找到通过搜索最好的答案，但我舍不得重建的.jar文件，改变了命名空间。花一些时间在这个问题上，我发现了一个更简单的方法来解决这个问题我的情况。我的code中的问题说法是
I ran into the same issue trying to use DigestUtils in my Android app. This was the best answer I could find by searching, but I was reluctant to rebuild the .jar file with the namespace changed. After spending some time on this issue, I found an easier way to solve the problem for my case. The problem statement for my code was
String s = DigestUtils.md5Hex(data);
替换此语句下面，它会工作：
Replace this statement with the following and it will work:
String s = new String(Hex.encodeHex(DigestUtils.md5(data)));
同样，对于shaHex为例，你可以把它改成
Similarly, for shaHex exampl, you can change it to
String hash = new String(Hex.encodeHex(DigestUtils.sha("textToHash");
这工作，因为即使Android不连接codeHexString（）有，但它有连接$ C $环己烷（）。希望这将有助于其他人谁遇到同样的问题。
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.
这篇关于使用DigestUtils Android中未找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！