Java 编译时如何通配符包含JAR文件？
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How to wildcard include JAR files when compiling?
提问by
I have the following in a java file (MyRtmpClient.java):
我在 java 文件 (MyRtmpClient.java) 中有以下内容：
import org.apache.mina.common.ByteBuffer;
and ByteBufferis inside a JAR file (with the proper directory structure of course).
That jar file and others I need are in the same directory as the .java file.
并且ByteBuffer在一个 JAR 文件中（当然有正确的目录结构）。该 jar 文件和我需要的其他文件与 .java 文件位于同一目录中。
Then I compile with the line:
然后我用以下行编译：
javac -cp ".;*.jar" MyRtmpClient.java
But I get the error:
但我收到错误：
MyRtmpClient.java:3: package org.apache.mina.common does not exist
import org.apache.mina.common.ByteBuffer;
MyRtmpClient.java:3: package org.apache.mina.common does not exist
import org.apache.mina.common.ByteBuffer;
How can I include jar files in my project?
如何在我的项目中包含 jar 文件？
采纳答案by cd1
your command line is correct, but there are some considerations:
您的命令行是正确的，但有一些注意事项：
- you must have javac >= 1.6, because only in that version the compiler parses the "*" as various JAR files.
- you must be running Windows, because ";" is the path separator for that operating system only (it doesn't work on Unix, the path separator on Unix is ":").
- 您必须有 javac >= 1.6，因为只有在该版本中，编译器才会将“*”解析为各种 JAR 文件。
- 您必须运行 Windows，因为“;” 仅是该操作系统的路径分隔符（它在 Unix 上不起作用，Unix 上的路径分隔符是“:”）。
I'm assuming that the JAR file has the proper directory structure as you stated.
我假设 JAR 文件具有您所说的正确目录结构。
回答by blispr
try including the jar file in your command line so :
尝试在命令行中包含 jar 文件，以便：
javac MyRtmpClient.java ByteBuffer.jar
javac MyRtmpClient.java ByteBuffer.jar
回答by Mark
javac does not understand *.jar in the classpath argument. You need to explicitly specify each jar. e.g.
javac 不理解类路径参数中的 *.jar。您需要明确指定每个 jar。例如
javac -cp ".;mina.jar" MyRtmpClient.java
回答by thanhduyspkt
In your case, I think JAVAC can not found jars file.
在您的情况下，我认为 JAVAC 找不到 jars 文件。
Please try:
请尝试：
PROJECT_PATH
- lib\a.jar
- src\package\b.java
PROJECT_PATH
- lib\a.jar
- src\package\b.java
cd @PROJECT_PATH
javac -classpath lib\a.jar src\package\b.java
回答by Rewinna
You cannot use -cpwith Javac. You have to use -classpathinstead (assuming the other settings are correct).
您不能-cp与Javac 一起使用。您必须-classpath改用（假设其他设置正确）。
回答by shashank
Probably below syntax will work on windows dos command
可能以下语法适用于 windows dos 命令
javac -cp ".;first.jar;second.jar;third.jar" MyRtmpClient.java
回答by plesiv
If you have utilities findand trat your disposal (e.g. you're working Linux), you could do:
如果您有实用程序find并且tr可以随意使用（例如，您使用的是 Linux），您可以执行以下操作：
javac -cp .:`find * -name "*.jar" | tr "\n" ":"` MyRtmpClient.java
All jarfiles in the current directory and all it's sub-directories will be added (shell command lists all jarfiles and puts colons as separators between them).
所有罐子在当前目录中的文件和它所有的子目录将被添加（shell命令列出所有的jar文件，并提出冒号它们之间的分隔符）。
解释：
- pair of the backticks ( `) denote shell commands to be executed,
find * -name "*.jar"finds and lists all jarfiles in hierarchy whose root is current folder,- vertical bar ( |) is pipe; connects output of
findto the input of next command, tr "\n" ":"replaces all newlinecharacters with coloncharacters.
- 一对反引号 ( `) 表示要执行的 shell 命令，
find * -name "*.jar"查找并列出层次结构中根为当前文件夹的所有jar文件，- 竖线 ( |) 是管道；将 的输出连接
find到下一个命令的输入， tr "\n" ":"用冒号字符替换所有换行符。
回答by Maciej Matys
In javac JDK 6 and above You could use (note lack of .jar):
在 javac JDK 6 及更高版本中，您可以使用（注意缺少 .jar）：
javac -cp ".;*" MyRtmpClient.java
to quote javac - Java programming language compiler
As a special convenience, a class path element containing a basename of * is considered equivalent to specifying a list of all the files in the directory with the extension .jar or .JAR.
For example, if directory foo contains a.jar and b.JAR, then the class path element foo/* is expanded to A.jar;b.JAR, except that the order of jar files is unspecified. All jar files in the specified directory, even hidden ones, are included in the list. A classpath entry consisting simply of * expands to a list of all the jar files in the current directory.
为方便起见，包含基本名称 * 的类路径元素被视为等效于指定目录中所有文件的列表，扩展名为 .jar 或 .JAR。
例如，如果目录 foo 包含 a.jar 和 b.JAR，则类路径元素 foo/* 扩展为 A.jar;b.JAR，只是未指定 jar 文件的顺序。指定目录中的所有 jar 文件，甚至隐藏的，都包含在列表中。仅由 * 组成的类路径条目扩展为当前目录中所有 jar 文件的列表。
回答by Ankush
In Java 8, the option ".;*" etc. which are mentioned above did not seem to work. I tried and found that :
javac -cp '<location of jars>/*' MyRtmpClient.java
在 Java 8 中，上面提到的选项“.;*”等似乎不起作用。我尝试并发现：
javac -cp '<location of jars>/*' MyRtmpClient.java
works:
作品：
<location of jar>can be /usr/local/classes/* or /home/developer/MyProject/*
<location of jar>可以是 /usr/local/classes/* 或 /home/developer/MyProject/*
