java IO流笔记 IO流异常处理

JDK7之前IO流这样处理：

public class Test {
    public static void main(String[] args) {
        /**
         * jdk7之前的标准io异常处理
         */
        FileInputStream fileInputStream = null;
        FileOutputStream fileOutputStream = null;
        try {
            fileInputStream = new FileInputStream("IO流\\aaa\\1.txt");
            fileOutputStream = new FileOutputStream("IO流\\aaa\\1_copy.txt");

            byte[] b = new byte[8192];
            int len = 0;
            while ((len = fileInputStream.read(b))!=-1){
                fileOutputStream.write(b,0,len);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                if(fileOutputStream!=null){
                    fileOutputStream.close(); 
                }
            } catch (IOException e) {
                e.printStackTrace();
            }finally {
                try {
                    if(fileInputStream!=null){
                        fileInputStream.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }
}

/**
 * jdk7开始
 * try-with-resoure语句，该语句保证了每个资源在语句结束是关闭资源
 */

public class Test2 {
    public static void main(String[] args) {
        /**
         * jdk7开始
         * try-with-resoure语句，该语句保证了每个资源在语句结束是关闭资源
         */
        try (
                //把创建流的代码放在（）小括号里面
                FileInputStream fileInputStream = new FileInputStream("IO流\\aaa\\2.txt");
                FileOutputStream fileOutputStream = new FileOutputStream("IO流\\aaa\\2_copy.txt");
            ){



            byte[] b = new byte[8192];
            int len = 0;
            while ((len = fileInputStream.read(b))!=-1){
                fileOutputStream.write(b,0,len);
            }
            //这段代码不用写了
           /* fileOutputStream.close();
            fileInputStream.close();*/
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

以上两种方式都可以，自己看着来使用