java io流完美关闭,java优雅关闭io流

教科书关闭的方法是每个都需要判断是否为空,每个都调用close。而且每个都需要在自己的try catch里面调用

如下图

InputStream is=null;

InputStreamReader isr=null;

BufferedReader read=null;

try {

is = new FileInputStream(new File(""));

isr = new InputStreamReader(is);

read = new BufferedReader(isr);

String s = read.readLine();

} finally {

try {

if(null!=is){

is.close();

}

}catch (Exception e){

e.printStackTrace();

}

try {

if(null!=isr){

isr.close();

}

}catch (Exception e){

e.printStackTrace();

}

try {

if(null!=read){

read.close();

}

}catch (Exception e){

e.printStackTrace();

}

}

但是io对象都来自接口Closeable,可以通过这个来关闭。

通过apache的ioutil包提供了良好的方法

如下图

InputStream is=null;

InputStreamReader isr=null;

BufferedReader read=null;

try {

is = new FileInputStream(new File(""));

isr = new InputStreamReader(is);

read = new BufferedReader(isr);

String s = read.readLine();

} finally {

IOUtils.closeQuietly(read,isr,is);

}

查看源代码

public static void closeQuietly(Closeable... closeables) {

if (closeables != null) {

Closeable[] arr$ = closeables;

int len$ = closeables.length;

for(int i$ = 0; i$ < len$; ++i$) {

Closeable closeable = arr$[i$];

closeQuietly(closeable);

}

}

}

public static void closeQuietly(Closeable closeable) {

try {

if (closeable != null) {

closeable.close();

}

} catch (IOException var2) {

;

}

}

就是遍历关闭

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