java小工具类

/**
 * 小工具集合类
 * @author hp
 *
 */
public class Utils {
    //JDBC 
    public static final String url = "jdbc:mysql://192.168.*.*:3306/*";  
    public static final String name = "com.mysql.jdbc.Driver";  
    public static final String user = "***";  
    public static final String password = "****";  
    private static Connection conn =null;

    public static Connection getConnection(){  
        try {  
            Class.forName(name);//加载驱动  
            conn = (Connection) DriverManager.getConnection(url,user,password);//获得连接     
        } catch (ClassNotFoundException e) {  
            System.out.println("加载驱动失败！！");  
            e.printStackTrace();  
        }catch (SQLException e) {  
            System.out.println("获取数据库连接失败！！");  
            e.printStackTrace();  
        }
        return conn;  
    }

    /**
     * 读取txt文件
     * @param filePath  文件路径
     */
    public static void readTxtFile(String filePath){
        try {
                String encoding="GBK";
                File file=new File(filePath);
                int num=0;
                if(file.isFile() && file.exists()){ //判断文件是否存在
                    InputStreamReader read = new InputStreamReader(
                    new FileInputStream(file),encoding);//考虑到编码格式
                    BufferedReader bufferedReader = new BufferedReader(read);
                    String lineTxt = null;
                    while((lineTxt = bufferedReader.readLine()) != null){
                        System.out.println(lineTxt);
                        num++;
                    }
                    System.out.println("读取"+num+"行文件！");
                    read.close();
        }else{
            System.out.println("找不到指定的文件");
        }
        } catch (Exception e) {
            System.out.println("读取文件内容出错");
            e.printStackTrace();
        }

    }
    /**
     * 向文件写入
     * @param content  写入内容 
     * @param filePath  文件路径
     */
    public static void writeTxtFile(String content,String filePath){
        FileWriter fw = null;
        try {
                File f=new File(filePath);
                //是否追加文件
                fw = new FileWriter(f, true);
                PrintWriter pw = new PrintWriter(fw);
                pw.println(content); 
                pw.flush();
                fw.flush();
                pw.close();
                fw.close();
        } catch (IOException e) {
                System.out.println("写入文件失败!");
                e.printStackTrace(); 
        }
    }
    /**
     * 生成32位随机ID
     * @return
     */
    public static String newUUID(){
        UUID uuid = UUID.randomUUID();
        String id = uuid.toString().trim().replaceAll("-", "");  
        return id;
    }
    /**
     * 正则工具
     * @param str 需要筛选的字符串
     * @param matcher 匹配器
     * @return 结果
     */
    public static String[] regular(String str,String matcher){
        Pattern p=Pattern.compile(matcher); 
        Matcher m=p.matcher(str);
        String[] result = new String[]{};
        int index=0;
        while(m.find()) {
           result = Arrays.copyOf(result, result.length+1);
           result[index++]=m.group();
           System.out.println(m.group());
        }
        return result;
    }

}