运行具有多个 jar 文件和类的 java 程序 [英] Running a java program with multiple jar files and classes

问题描述

我正在编译一个包含多个 jar 文件(在 lib 文件夹内)和类(在 src/com 文件夹内)的程序:

I am compiling a program with multiple jar files (inside the lib folder) and classes (inside the src/com folder) with:

javac -classpath lib/* src/com/*.java

我输入这个来运行程序:

I typed this to run the program:

java -cp lib/* src/com/okc

但它不起作用.相反，我明白了:

But it doesn't work. Instead, I get this:

Error: Could not find or load main class src.com.okc

okc.java 是包含 main 方法的类.如何运行包含多个 jar 文件和类的 java 程序?

okc.java is the class containing the main method. How can I run a java program with multiple jar files and classes?

推荐答案

Java 类文件不仅仅是文件本身.代表类包的目录结构是类文件的一部分.你的类路径需要指向最顶层包目录的父目录.

A Java class file is not just the file itself. The directory structure which represents a class's package is part of the class file. Your classpath needs to point to the directory which is the parent of the topmost package directory.

假设您的类是用package com; 声明的，那么最顶层的包目录是com.所以你的类路径中需要 com 的 parent:

Assuming your class is declared with package com;, the topmost package directory is com. So you need the parent of com in your classpath:

java -classpath src:lib/* com.okc

如果你的类不包含任何package语句，而你刚好把它放在com目录下，那么它属于空包，其父目录是 com 本身:

If your class does not contain any package statement, and you just happened to put it in a com directory, then it belongs to the null package, whose parent directory is com itself:

java -classpath src/com:lib/* okc

附加说明:Java 约定让类名及其各自的文件名以大写字母开头.原因之一是它使类名易于与包组件区分开来.

An additional note: It is Java convention to have class names, and their respective file names, start with an uppercase letter. One reason is that it makes class names easy to distinguish from package components.

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