生成Jar包META-INF配置

测试mysql数据库连接：

package cn.yws.fuck;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class Fuck {

	public static void main(String[] args) {
		if(args.length!=2)
		{
			args=new String[]{"root","root"};
			System.out.println("user==null password=null");
		}
		// 驱动程序名
		String driver = "com.mysql.jdbc.Driver";
		// URL指向要访问的数据库名scutcs
		String url = "jdbc:mysql://127.0.0.1:3306/mysql";
		// MySQL配置时的用户名
		String user = args[0];
		// MySQL配置时的密码
		String password = args[1];
		try {
			// 加载驱动程序
			Class.forName(driver);
			// 连续数据库f
			Connection conn = DriverManager.getConnection(url, user, password);
			if (!conn.isClosed())
				System.out.println("Succeeded connecting to the Database!");
			// statement用来执行SQL语句
			Statement statement = conn.createStatement();
			// 要执行的SQL语句
			String sql = "select * from user";
			// 结果集
			ResultSet rs = statement.executeQuery(sql);
			while (rs.next()) {
				System.out.println(rs.getString(1)+","+rs.getString(2)+
						rs.getString(3)+","+rs.getString(4)+","+rs.getString(5));
			}
			rs.close();
			conn.close();
			System.out.println("ok");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

生成Jar包META-INF配置

Manifest-Version: 1.0
Main-Class: cn.yws.fuck.Fuck
Class-Path: lib/mysql-connector-java-5.1.6-bin.jar

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.util;

import java.util.Map.Entry;
import java.util.jar.*;

/**
 * A micro-application that prints the main class name out of a jar file.
 */
public class PrintJarMainClass {
  
  /**
   * @param args
   */
  public static void main(String[] args) {
    try {
      JarFile jar_file = new JarFile(args[0]);
      if (jar_file != null) {
        Manifest manifest = jar_file.getManifest();
        if (manifest != null) {
          String value = manifest.getMainAttributes().getValue("Main-Class");
          if (value != null) {
            System.out.println("Main-Class:"+value.replaceAll("/", "."));
            //return;
          }
        }
        for (Entry data : manifest.getMainAttributes().entrySet()) {
			
        	System.out.println(data.getKey()+":"+data.getValue());
		}
      }
    } catch (Throwable e) {
      // ignore it
    	e.printStackTrace();
    }
    System.out.println("UNKNOWN");
    System.exit(1);
  }
  
}