我正在使用 CSVReader 类,该类将本地文件作为输入。但现在,我需要能够读取本地文件以及具有 URL 路径的文件(例如http://example.com/example.txt http://example.com/example.txt)。为此,我想从 CSVReader 派生一个类,用于标识文件是本地文件还是 URL,然后在构造函数的第一行中使用 super() 将 InputStream 传递给父级。这样做的优雅方法是什么?
public class FileReader extends CsvReader{
public FileReader(){
if (fileName != null) {
if (fileName.trim().startsWith("http:")) {
// it is URL
URL url = new URL(fileName);
inputStream = new BufferedReader(new InputStreamReader(
url.openStream(), charset),
StaticSettings.MAX_FILE_BUFFER_SIZE);
}else{
//it is a local file
inputStream = new BufferedReader(new InputStreamReader(
new FileInputStream(fileName), charset),
StaticSettings.MAX_FILE_BUFFER_SIZE);
}
}
//Now pass the input stream to CsvReader
super(inputStream, delimiter, charset); //error - super has to be first line of constructor
}
}
您可以编写辅助方法:
super(createReader(createInputStream(resouce), "UTF-8"), ";");
您的辅助方法可能如下所示:
public static InputStream createInputStream(String resource)
{
resource = resource.trim();
if (resource.startsWith("http:"))
{
return new URL(resource).openStream();
} else
{
return new FileInputStream(new File(resource));
}
}
public static BufferedReader createReader(InputStream is, String charset)
{
return new BufferedReader(new InputStreamReader(is, charset));
}
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