IO异常 的处理

package cn.itcast.exception;

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);
}
}
}

}