查找包里的所有类名代码,Java代码库,德仔网

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【Java】查找包里的所有类名
作者: / 发布于2016/11/14/ 518
package org.happy.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.net.URL;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ConfigUtils {
	
	private static final Logger LOG = LoggerFactory.getLogger(IOUtils.class);
	
    private IOUtils() {
        super();
    }
	
	public static InputStream getInputStream(String path) throws FileNotFoundException{
		return getInputStream(path, IOUtils.class);
	}
	
	/**
	 * 查找配置文件：
	 * 1） 从用户工作目录查找；
	 * 2）从用户classes类加载路径查找；
	 * 3）从用户给定的类所在的包里开始查找；
	 * 
	 * @param path
	 * @param claz
	 * @return
	 * @throws FileNotFoundException
	 */
	public static InputStream getInputStream(String path, Class<?> claz) throws FileNotFoundException{
		InputStream is = null;
		
		URL clasPath, packPath=null;
		File file = new File(System.getProperty("user.dir"), path);
		if(file.exists()){
			LOG.info("found file: {}", file.getAbsolutePath());
			is = new FileInputStream(file);
		}else{
			// 这里是从classes开始查找
			ClassLoader cl = claz.getClassLoader();
			clasPath = cl.getResource(path);
			is = cl.getResourceAsStream(path);
			if(is != null){
				LOG.info("found file: {}", clasPath);
			}else{
				// 这里是从class对应得包开始查找
				packPath = claz.getResource(path);
				is = claz.getResourceAsStream(path);
				if(is != null){
					LOG.info("found file: {}", packPath);
				}else{
					LOG.error("No found file: {}, search path: \n {} \n {} \n {}", path, file, clasPath, packPath);
				}
			}
		}
		
		return is;
	}
	
	/**
	 * Borrowed from apache IOUtils;
	 * 
     * Unconditionally close an Reader.
     * 
     * Equivalent to {@link Reader#close()}, except any exceptions will be ignored.
     * This is typically used in finally blocks.
     *
     * @param input  the Reader to close, may be null or already closed
     */
    public static void closeQuietly(Reader input) {
        try {
            if (input != null) {
                input.close();
            }
        } catch (IOException ioe) {
            // ignore
        }
    }
    
    /**
     * Unconditionally close an InputStream.
     * 
     * Equivalent to {@link InputStream#close()}, except any exceptions will be ignored.
     * This is typically used in finally blocks.
     *
     * @param input  the InputStream to close, may be null or already closed
     */
    public static void closeQuietly(InputStream input) {
        try {
            if (input != null) {
                input.close();
            }
        } catch (IOException ioe) {
            // ignore
        }
    }

    
    /**
     * Borrowed from apache IOUtils;
     * 
     * Unconditionally close a Writer.
     * 
     * Equivalent to {@link Writer#close()}, except any exceptions will be ignored.
     * This is typically used in finally blocks.
     *
     * @param output  the Writer to close, may be null or already closed
     */
    public static void closeQuietly(Writer output) {
        try {
            if (output != null) {
                output.close();
            }
        } catch (IOException ioe) {
            // ignore
        }
    }
    
    /**
     * Unconditionally close an OutputStream.
     * 
     * Equivalent to {@link OutputStream#close()}, except any exceptions will be ignored.
     * This is typically used in finally blocks.
     *
     * @param output  the OutputStream to close, may be null or already closed
     */
    public static void closeQuietly(OutputStream output) {
        try {
            if (output != null) {
                output.close();
            }
        } catch (IOException ioe) {
            // ignore
        }
    }
    
}
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