第一种：包含package编译运行
// MySocketServer.java文件
package canyou.cys.datapool;
import java.io.*;
import java.net.*;
/**
*@author Administrator
*
*/
//socket 服务端
public class MySocketServer
{
/**
* @param args
*/
public static void main(String[] args)
{
// TODO Auto-generated method stub
}
}
//------------------------------------------------------------------------------
root@bt:/java2# pwd
/java2
root@bt:/java2# ls
MySocketServer.java
root@bt:/java2# javac -d . MySocketServer.java
root@bt:/java2# ls
canyou MySocketServer.java
root@bt:/java2# cd /java2/canyou/cys/datapool/
root@bt:/java2/canyou/cys/datapool# ls
MySocketServer.class
root@bt:/java2/canyou/cys/datapool# java MySocketServer
Exception in thread "main" java.lang.NoClassDefFoundError: MySocketServer (wrong name: canyou/cys/datapool/MySocketServer)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: MySocketServer. Program will exit.
root@bt:/java2/canyou/cys/datapool# cd /java2/
root@bt:/java2# ls
canyou MySocketServer.java
root@bt:/java2# java canyou.cys.datapool.MySocketServer
Listen port :18888 ...
第二种：引用其它package编译运行
// 修改MySocketServer.java文件
package canyou.cys.datapool;
import java.io.*;
import java.net.*;
import com.cys.data.*;
/**
*@author Administrator
*
*/
//socket 服务端
public class MySocketServer
{
/**
* @param args
*/
public static void main(String[] args)
{
// TODO Auto-generated method stub
MyTest t = new MyTest(); //调用MyTest.java的TestPrintl()方法
t.TestPrintln();
}
}
//MyTest.java文件
package com.cys.data;
import java.io.*;
import java.net.*;
/**
*@author Administrator
*
*/
public class MyTest
{
/**
* @param args
*/
public static void TestPrintln ()
{
// TODO Auto-generated method stub
try
{
System.out.println("Creating new TestPrintln() in main");
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
//------------------------------------------------------------------------------
root@bt:/java2# javac -d . MyTest.java
root@bt:/java2# javac -d . MySocketServer.java
root@bt:/java2# java canyou.cys.datapool.MySocketServer
Creating new TestPrintln() in main
Listen port :18888 ...
第三种：引用外部.jar方法编译运行
root@bt:/java2# javac -d . MyTest.java //编译外部文件
root@bt:/java2# jar cvf com.jar com/* //外部文件打包成jar
标明清单(manifest)
增加：com/cys/(读入= 0) (写出= 0)(存储了 0%)
增加：com/cys/data/(读入= 0) (写出= 0)(存储了 0%)
增加：com/cys/data/MyTest.class(读入= 516) (写出= 351)(压缩了 31%)
root@bt:/java2# cat /etc/profile
CLASSPATH=.:/home/jdk1.5.0_22/jre/lib/rt.jar:/java2/com.jar
root@bt:/java2# logout
root@bt:/java2# javac -d . MySocketServer.java
root@bt:/java2# java canyou.cys.datapool.MySocketServer
Creating new TestPrintln() in main
Listen port :18888 ...
CLASSPATH linux是以”:”冒号分开的。修改完记住要注销喔!
第四种：用find命令批量引用外部.jar方法编译运行
root@bt:/java2/lib# ls
a.jar b.jar CanYou d.jar e.jar
root@bt:/java2/lib#
在Linux下可以通过这样的方法把/java2/lib目录下的所有jar文件添加到CLASSPATH'
root@bt:/java2# find /java2/lib -name *.jar|tr '\n' ':'
/java2/lib/a.jar:/java2/lib/e.jar:/java2/lib/d.jar:/java2/lib/b.jar:/java2/lib/CanYou/com.jar:
同样的方法，可以把/java2/lib他下面的目录以及目录下面的子目录和更下层目录也添加到CLASSPATH里面则通过以下方法
root@bt:/java2# find /java2/lib -type d|tr '\n' ':'
/java2/lib:/java2/lib/CanYou:
root@bt:/java2# vim /etc/profile
CLASSPATH=.:/home/jdk1.5.0_22/jre/lib/rt.jar:`find /java2/lib -name *.jar|tr '\n' ':'`
root@bt:/java2# logout
…
root@bt:/java2# set //查看下环境变量
CLASSPATH=.:/home/jdk1.5.0_22/jre/lib/rt.jar:/java2/lib/a.jar:/java2/lib/e.jar:/java2/lib/d.jar:/java2/lib/b.jar:/java2/lib/CanYou/com.jar:
root@bt:/java2# javac -d . MySocketServer.java
root@bt:/java2# java canyou.cys.datapool.MySocketServer
Creating new TestPrintln() in main
Listen port :18888 ...
第五种：java –jar ***.jar文件执行
打包好我们jar文件
root@bt:/java2# javac -d . MySocketServer.java
root@bt:/java2# jar cvf canyou.jar canyou/* //打包成jar
root@bt:/java2# ls
canyou.jar lib //lib包含我们canyou.jar里面class需要调用的第三方jar文件
root@bt:/java2#
…
//制作MANIFEST.MF文件
..
root@bt:/java2# java -jar canyou.jar
Creating new TestPrintln() in main
Listen port :18888 ...
用winrar压缩软件打开我们的canyou.jar，编辑META-INF/MANIFEST.MF文件
Manifest-Version: 1.0
Created-By: 1.5.0_22 (Sun Microsystems Inc.)
Class-Path: lib/CanYou/com.jar
Main-Class: canyou.cys.datapool.MySocketServer
注意最后一行需要一个回车符，每个冒号”:” 有一个空格。 Class-Path指定我们需要的第三方jar；Main-Class指定我们当前需要运行的.jar的main函数所在的类。