IO异常 的处理

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.management.RuntimeErrorException;

/*
 IO异常 的处理

 */
public class Demo1 {

    public static void main(String[] args) {
    //    readTest();
        
        copyImage();
    }

    // 拷贝图片
    public static void copyImage() {
        FileInputStream fileInputStream = null;
        FileOutputStream fileOutputStream = null;

        try {
            // 找到目标文件
            File inFile = new File("F:\\美女\\1.jpg");
            File outFile = new File("E:\\1.jpg");
            // 建立输入输出通道
            fileInputStream = new FileInputStream(inFile);
            fileOutputStream = new FileOutputStream(outFile);
            // 建立缓冲数组，边读边写
            byte[] buf = new byte[1024];
            int length = 0;
            while ((length = fileInputStream.read(buf)) != -1) {
                fileOutputStream.write(buf, 0, length);
            }
        } catch (IOException e) {
            System.out.println("拷贝图片出错...");
            throw new RuntimeException(e);
        } finally {
            // 关闭资源
            try {
                if (fileOutputStream != null) {
                    fileOutputStream.close();
                    System.out.println("关闭输出流对象成功...");
                }
            } catch (IOException e) {
                System.out.println("关闭输出流资源失败...");
                throw new RuntimeException(e);
            } finally {
                if (fileInputStream != null) {
                    try {
                        fileInputStream.close();
                        System.out.println("关闭输入流对象成功...");
                    } catch (IOException e) {
                        System.out.println("关闭输入流对象失败...");
                        throw new RuntimeException(e);
                    }
                }

            }
        }
    }

    public static void readTest() {
        FileInputStream fileInputStream = null;
        try {
            // 找到目标文件
            File file = new File("F:\\aaaaa.txt");
            // 建立数据输入通道
            fileInputStream = new FileInputStream(file);
            // 建立缓冲数组读取数据
            byte[] buf = new byte[1024];
            int length = 0;
            while ((length = fileInputStream.read(buf)) != -1) {
                System.out.print(new String(buf, 0, length));
            }
        } catch (IOException e) {
            /*
             * //处理的代码... 首先你要阻止后面的代码执行,而且要需要通知调用者这里出错了... throw new
             * RuntimeException(e);
             * //把IOException传递给RuntimeException包装一层，然后再抛出，这样子做的目的是
             * 为了让调用者使用变得更加灵活。
             */
            System.out.println("读取文件资源出错....");
            throw new RuntimeException(e);
        } finally {
            try {
                if (fileInputStream != null) {
                    fileInputStream.close();
                    System.out.println("关闭资源成功...");
                }
            } catch (IOException e) {
                System.out.println("关闭资源失败...");
                throw new RuntimeException(e);
            }
        }
    }

}