在Linux终端中使用-class路径运行java程序
我花了一个小时尝试使用 postgresql 类路径运行以下程序
class Test{
public static void main(String[] args){
try {
Class.forName("org.postgresql.Driver");
} catch (ClassNotFoundException cnfe) {
System.err.println("Couldn't find Postgresql driver class!");
}
}
}
该程序使用 javac 命令编译得很好，但我很难使用 postgresql 类路径运行它。我在与该文件相同的目录中有“postgresql-9.0-801.jdbc4.jar”，我尝试了以下操作，但没有一个起作用
java -classpath ./postgresql-9.0-801.jdbc4.jar Test
java -classpath postgresql-9.0-801.jdbc4.jar Test
java -classpath "postgresql-9.0-801.jdbc4.jar" Test
我做错了什么？
I've been trying for an hour to run the following program with a the postgresql classpath
class Test{
public static void main(String[] args){
try {
Class.forName("org.postgresql.Driver");
} catch (ClassNotFoundException cnfe) {
System.err.println("Couldn't find Postgresql driver class!");
}
}
}
The program compiled fine with the javac command, but I'm having a hard time running it with the postgresql classpath. I have "postgresql-9.0-801.jdbc4.jar" in the same directory as the file and I tried the following, but non of them worked
java -classpath ./postgresql-9.0-801.jdbc4.jar Test
java -classpath postgresql-9.0-801.jdbc4.jar Test
java -classpath "postgresql-9.0-801.jdbc4.jar" Test
What am I doing wrong?
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当您指定类路径时，您需要确保它包含您的应用程序所需的所有类文件，包括您自己创建的类文件。假设 Test.class 与 postgres Jar 文件一起位于当前目录中，您需要类似以下内容：
请参阅 Java术语表了解更多详细信息。
嗯~
When you specify the classpath you need to make sure it includes ALL of the class files your application needs, including the ones you create yourself. Assuming that Test.class is in the current directory along with the postgres Jar file, you need something like:
See the Java Glossary for more details.
bm~
错误是什么？
Test或postgres库的ClassNotFoundException？如果是前者，那是因为您还需要在类路径中添加 Test 。假设您位于 Test.class 和 postgres jar 所在的同一目录中，
What is the error?
ClassNotFoundExceptionforTestor thepostgreslibrary? If former, it is because you need to add Test in your classpath as well.Assuming you are in the same directory where Test.class and the postgres jar is present,
jar 和类都位于运行命令的同一目录中
同时将你的类定义设为公开！！
both the jar and the class are in the same directory from which the command is run
Also make your class definition as public !!