如何使用Java将字符串保存到文本文件？ [英] How do I save a String to a text file using Java?

问题描述

在Java中，我从一个名为text的字符串变量中的文本字段获取文本。

如何将text变量的内容保存到如果你只是输出文本，而不是任何二进制数据，下面的工作：

>

  PrintWriter out = new PrintWriter（filename.txt）; 
  

然后，写下你的字符串，就像你对任何输出流一样：

  out.println（text）; 
  

您将需要异常处理。请确保在完成写作时调用 out.close（）。如果您正在使用Java 7或更高版本，您可以使用试用资源声明，它会自动关闭你的 PrintStream 当你完成它（即退出块），如下所示：

<$ （printWriter out = new PrintWriter（filename.txt））{
out.println（text）; pre>



$ b

你仍然需要显式地抛出 java。 io.FileNotFoundException 和以前一样。

In Java, I have text from a text field in a String variable called "text".

How can I save the contents of the "text" variable to a file?

解决方案

If you're simply outputting text, rather than any binary data, the following will work:

PrintWriter out = new PrintWriter("filename.txt");

Then, write your String to it, just like you would to any output stream:

out.println(text);

You'll need exception handling, as ever. Be sure to call out.close() when you've finished writing.

If you are using Java 7 or later, you can use the "try-with-resources statement" which will automatically close your PrintStream when you are done with it (ie exit the block) like so:

try(  PrintWriter out = new PrintWriter( "filename.txt" )  ){
    out.println( text );
}

You will still need to explicitly throw the java.io.FileNotFoundException as before.

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