Java的。(Java. What is the valid way try to close all connections? [duplicate])

Java的。(Java. What is the valid way try to close all connections? [duplicate])

例如，我有处理输入/输出流的方法：

public void doSomethingWithStreams () throws FileNotFoundException, IOException { OutputStream out1, out2; InputStream in1, in2; try{ //do something with Streams: read, write, process, etc. } finally{ //There I try to close connections out1.close(); out2.close(); in1.close(); in2.close(); } }

方法可以抛出IOException并且它是有效的行为。 但是如果我在这一行中有异常：

out1.close();

其他三个Stream将不会关闭。 你可以推荐什么解决方案？ 怎么样？ 有多接近？

我只有一个：

public void doSomethingWithStreams () throws FileNotFoundException, IOException { OutputStream out1, out2; InputStream in1, in2; try{ //do something with Streams: read, write, process, etc. } finally{ //There I try to close connections try{out1.close();} finally{ try{out2.close();} finally{ try{in1.close();} finally{ in2.close();} }} } }

正如你所看到的 - 我的方法是使用多个try-finally块。

你认为这是个好主意吗？

This question already has an answer here:

Proper way to close an AutoCloseable 1 answer

For example, I have method for working with input/output streams:

public void doSomethingWithStreams () throws FileNotFoundException, IOException { OutputStream out1, out2; InputStream in1, in2; try{ //do something with Streams: read, write, process, etc. } finally{ //There I try to close connections out1.close(); out2.close(); in1.close(); in2.close(); } }

Method can throws IOException and it is valid behavior. But If I have Exception in this line:

out1.close();

others three Stream will be NOT closed. What solution can you recommend? How? How close all?

I have just one:

public void doSomethingWithStreams () throws FileNotFoundException, IOException { OutputStream out1, out2; InputStream in1, in2; try{ //do something with Streams: read, write, process, etc. } finally{ //There I try to close connections try{out1.close();} finally{ try{out2.close();} finally{ try{in1.close();} finally{ in2.close();} }} } }

As you can see - my approach is using multiple try-finally blocks.

Do you think it is good idea?

最满意答案

如果三个流不相互依赖，可能会为每个流看起来更干净。

就像是：

try{ out1.close(); }catch(Exception e) { .... }finally

{....}

try{ out2.close(); }catch(Exception e) { ..... }finally

{....}

编辑：如iccthedral建议，如果您使用Java7，您可以使用try-with-resource块。

If three streams are not dependent on each other, may be having try/catch for each stream look cleaner.

Something like:

try{ out1.close(); }catch(Exception e) { .... }finally

{.... }

try{ out2.close(); }catch(Exception e) { ..... }finally

{.... }

EDIT: As iccthedral suggested, if you use Java7 you may use try-with-resource block.