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;
    }

}