Java 无法解析符号“IOUtils”
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Cannot resolve symbol 'IOUtils'
提问by Harikrishnan
I have used the following code to create a temporary file in my android app:
我使用以下代码在我的 android 应用程序中创建了一个临时文件：
public File streamToFile (InputStream in) throws IOException {
File tempFile = File.createTempFile("sample", ".tmp");
tempFile.deleteOnExit();
FileOutputStream out = new FileOutputStream(tempFile);
IOUtils.copy(in, out);
return tempFile;
}
Now the problem is Cannot resolve symbol 'IOUtils'. I did a little bit of googling and discovered that for using IOUtils I need to download and include a jar file. I downloaded the jar file from here(commons-io-2.4-bin.zip). I added the jar named commons-io-2.4.jarfrom the zip to my bundle and when I tried to import it using:
现在的问题是Cannot resolve symbol 'IOUtils'。我做了一点谷歌搜索，发现要使用 IOUtils，我需要下载并包含一个 jar 文件。我从这里下载了 jar 文件（commons-io-2.4-bin.zip）。我将commons-io-2.4.jarzip 中命名的 jar 添加到我的包中，当我尝试使用以下命令导入它时：
import org.apache.commons.io.IOUtils;
It is showing error Cannot resolve symbol 'io'. So I tried to import it like:
它显示错误Cannot resolve symbol 'io'。所以我试着像这样导入它：
import org.apache.commons.*
But still I am getting the error Cannot resolve symbol 'IOUtils'.
但我仍然收到错误Cannot resolve symbol 'IOUtils'。
Question 1 : Why am I getting this error? How to resolve it?
问题 1：为什么会出现此错误？如何解决？
Question 2 : Is there any way to create a temp file from an InputStream without using an external library? Or is this the most efficient way to do that? I am using android studio.
问题 2：有没有办法在不使用外部库的情况下从 InputStream 创建临时文件？或者这是最有效的方法吗？我正在使用安卓工作室。
采纳答案by Harikrishnan
Right clicking on the commons-io-2.4.jarfile in project navigator and clicking 'Add to project' solved the issue.
右键单击commons-io-2.4.jar项目导航器中的文件并单击“添加到项目”解决了该问题。
回答by Ivo Stoyanov
For Android Studio:
对于安卓工作室：
- File -> Project Structure... -> Dependencies
- Click '+' in the upper right corner and select "Library dependency"
- In the search field type: "org.apache.commons.io" and click Search
- Select "org.apache.directory.studio:org.apache.commons.io:
- 文件 -> 项目结构... -> 依赖项
- 单击右上角的“+”并选择“库依赖项”
- 在搜索字段中键入：“org.apache.commons.io”并单击“搜索”
- 选择“org.apache.directory.studio:org.apache.commons.io：
Happy coding :)
快乐编码:)
回答by iamjoshua
For those who encountered this while working on a Netbeans Java project. What I did is I downloaded the Binaries Zip of IO here
对于在处理 Netbeans Java 项目时遇到此问题的人。我所做的是在这里下载了 IO 的 Binaries Zip
Commons IO Util Jar Download Here
Then Right clicked on my Project>Properties>
然后右键单击我的项目>属性>
On the Categories Pane, Click Libraries
在类别窗格中，单击库
Then Click Add Jar/Folder
然后单击添加 Jar/文件夹
Locate the jar file/folder of the extracted IO Util that was downloaded.
找到已下载的解压 IO Util 的 jar 文件/文件夹。
Then click Ok. That fixed mine. :)
然后单击确定。那个固定的我的。:)
