Java SE之IO

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * @author Kevin 2018-1-10
 * 
 * io操作工具类。读取office（word）内容建议POI，pdf建议iText。
 * 
 * 学习：http://ifeve.com/java-io/
 *
 */
public class IOUtil {
	
	private static final int DEFAULT_BYTE_SIZE = 1024;

	//can not create object IOUtil
	private IOUtil(){}
	
	/**
	 * 复制文件
	 * @param srcPath
	 * @param descPath
	 */
	private static void copyFile(String srcPath, String descPath) {
		
		InputStream in = null;
		OutputStream out = null;
		
		try {
			in = new FileInputStream(new File(srcPath));
			byte[] bytes = new byte[DEFAULT_BYTE_SIZE];
			
			out = new FileOutputStream(descPath);
			
			int len = 0;
			while((len = in.read(bytes)) != -1){
				out.write(bytes, 0, len);
			}
		} catch (Exception e) {
			
		} finally {
			if(in != null){
				try {
					in.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			
			if(out != null){
				try {
					out.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}
	
	/**
	 * 读取文件为字节数组。
	 * @param path
	 * @return
	 */
	public static byte[] readFile2Byte(String path){
		InputStream in = null;
				
		try {
			in = new FileInputStream(new File(path));
			byte[] bytes = new byte[in.available()];
			
			int len = 0;
			for(int i = 0;(len=in.read())!=-1;i++){
				bytes[i] = (byte) ((char)len);
			}
			return bytes;
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if(in != null){
				try {
					in.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return null;
	}
	
}