java 文件打开文件_如何用Java打开文件

太过爱你忘了你带给我的痛 2023-02-28 08:39 215阅读 0赞

java 文件 打开文件

Sometimes we have to open a file in java program. `java.awt.Desktop` can be used to open a file in java. Desktop implementation is platform dependent, so first, we should check if the operating system supports Desktop or not. This class looks for the associated application registered to the current platform to open a file.

有时我们必须在Java程序中打开文件。 `java.awt.Desktop`可用于在Java中打开文件。 桌面实施取决于平台，因此，首先，我们应该检查操作系统是否支持桌面。 此类查找在当前平台上注册的关联应用程序，以打开文件。

## Java打开文件 **(**Java Open File**)** ##

[![java open file, how to open a file in java][java open file_ how to open a file in java]][java open file_ how to open a file in java_java open file_ how to open a file in java]

Let’s have a look at the simple java open file program. If we try to open a file that doesn’t exist, it will throw `java.lang.IllegalArgumentException`.

让我们看一下简单的Java打开文件程序。 如果我们尝试打开一个不存在的文件，它将抛出`java.lang.IllegalArgumentException` 。

Let’s see Desktop class example for java open file.

让我们看一下Java打开文件的Desktop类示例。

`JavaOpenFile.java`

package com.journaldev.files;
    
    import java.awt.Desktop;
    import java.io.File;
    import java.io.IOException;
    
    public class JavaOpenFile {
    
        public static void main(String[] args) throws IOException {
            //text file, should be opening in default text editor
            File file = new File("/Users/pankaj/source.txt");
            
            //first check if Desktop is supported by Platform or not
            if(!Desktop.isDesktopSupported()){
                System.out.println("Desktop is not supported");
                return;
            }
            
            Desktop desktop = Desktop.getDesktop();
            if(file.exists()) desktop.open(file);
            
            //let's try to open PDF file
            file = new File("/Users/pankaj/java.pdf");
            if(file.exists()) desktop.open(file);
        }
    
    }

When you run the above program, the text file will be opened in the default text editor. Similarly, a PDF file will be opened in adobe acrobat reader.

当您运行上述程序时，该文本文件将在默认的文本编辑器中打开。 同样，将在Adobe Acrobat Reader中打开PDF文件。

If there are no application associated with given file type or the application is failed to launch, `open` method throws `java.io.IOException`.

如果没有与给定文件类型关联的应用程序，或者应用程序启动失败，则`open`方法将抛出`java.io.IOException` 。

That’s all for a simple program to open a file in java.

这就是一个简单的程序来用Java打开文件。

> 翻译自: [https://www.journaldev.com/864/java-open-file][https_www.journaldev.com_864_java-open-file]

java 文件 打开文件

[java open file_ how to open a file in java]: http://imgconvert.csdnimg.cn/aHR0cHM6Ly9jZG4uam91cm5hbGRldi5jb20vd3AtY29udGVudC91cGxvYWRzLzIwMTIvMTIvamF2YS1vcGVuLWZpbGUuanBn?x-oss-process=image/format,png
[java open file_ how to open a file in java_java open file_ how to open a file in java]: https://cdn.journaldev.com/wp-content/uploads/2012/12/java-open-file.jpg
[https_www.journaldev.com_864_java-open-file]: https://www.journaldev.com/864/java-open-file