java-study使用FileInputStream與FileOutputStream文件讀/寫/複製，枚舉的使用

import java.io.FileInputStream;
import java.io.FileOutputStream;
//import org.apache.commons.lang.CharEncoding;

/**
 * file讀寫工具類
 */
public class FileReadAndWrite {
    public static void main(String[] args) {
//        FileReadAndWrite.read("E:\\java-study\\src\\com\\streamTest\\fis2.txt");
//        FileReadAndWrite.write("E:\\java-study\\src\\com\\streamTest\\fos.txt", "linge加油", WriteType.ADD);
        FileReadAndWrite.copy("C:\\Users\\lucklin\\Desktop\\abc.png", "E:\\java-study\\src\\com\\streamTest\\abc.png");
    }
    /**
     * @description 讀取文件內容
     * @param path 文件路徑
     */
    static String read(String path) {
        String res = null;
        try {
            FileInputStream fis = new FileInputStream(path);
            byte[] b = new byte[1024];
            int len = 0;

            while ((len = fis.read(b)) != -1) {
                res = new String(b,0, len);
            }
            fis.close();
        } catch(Exception e) {
            System.out.println("文件讀取異常:"+e.getMessage());
        }
        return res;
    }
    /**
     * @description 寫入文件內容
     * @param path 文件路徑
     * @param content 寫入內容
     */
    static void write(String path, String content) {
        try {
            //new FileOutputStream在文件不存在的情況下會默認創建,所以雖然會拋出不存在異常但是不會阻塞後續執行,前提path要正確
            FileOutputStream fos = new FileOutputStream(path);
            byte[] b = content.getBytes();
//            System.out.println(b.length);
//            fos.write(b,0, b.length);//寫入內存
            fos.write(b);//寫入內存
            fos.flush();//寫入硬盤
            fos.close();
            System.out.println("寫入成功");
        } catch (Exception e) {
            System.out.println("文件寫入異常:"+e.getMessage());
        }
    }
    /**
     * @description 寫入文件內容
     * @param path 文件路徑
     * @param content 寫入內容
     * @param type 寫入方式
     */
    static void write(String path, String content, WriteType type) {
        String oldContent = read(path);
        content = oldContent != null && type.equals(WriteType.ADD) ? oldContent + content : content;
        write(path, content);
    }
    /**
     * @description 複製文件
     * @param source 文件路徑
     * @param target 目標文件路徑
     */
//    static void copy(String source, String target) {//new String()和String.getBytes的編碼問題有時間再研究
//        String content = read(source);
//        if(content != null) write(target, content);
//    }
    static void copy(String source, String target) {
       try {
           FileInputStream fis = new FileInputStream(source);
           FileOutputStream fos = new FileOutputStream(target);
           byte[] b = new byte[1024];
           int len = 0;

           while ((len = fis.read(b)) != -1) {
               fos.write(b, 0, len);
           }
           fos.flush();
           fis.close();
           fos.close();
       }catch (Exception e) {
           e.printStackTrace();
       }
    }

}

enum WriteType{
//    ADD,
//    REPLACE
    ADD("add", "追加寫入"),
    REPLACE("replace", "覆蓋寫入");
    private final String TYPE;
    private final String DESC;
    WriteType(String type, String desc) {
        TYPE = type;
        DESC = desc;
    }
}