Question

请考虑以下事项。

val br = new BufferedReader(new FileReader(inputFileName))

但是我想直接从网络上读取一个文件，而不是一个文件，即来自ftp或http。那么，从URL读取的等价物是什么？

Answer 1

URLConnection 。

以下是Java文档中的示例：Reading from and Writing to a URLConnection：

import java.net.*;
import java.io.*;

public class URLConnectionReader {
    public static void main(String[] args) throws Exception {
        URL oracle = new URL("http://www.oracle.com/");
        URLConnection yc = oracle.openConnection();
        BufferedReader in = new BufferedReader(new InputStreamReader(
                                    yc.getInputStream()));
        String inputLine;
        while ((inputLine = in.readLine()) != null) 
            System.out.println(inputLine);
        in.close();
    }
}

Answer 2

你可以使用java.io.InputStream

import java.net。; import java.io。;

public class URLConnectionReader { 
    public static void main(String[] args) throws Exception {
        URL oracle = new URL("http://www.oracle.com/");
        URLConnection yc = oracle.openConnection();
        BufferedReader in = new BufferedReader(new InputStreamReader(
                                    yc.getInputStream()));
        String inputLine;
        while ((inputLine = in.readLine()) != null) 
            System.out.println(inputLine);
        in.close();
    } 
}

有关详细信息，请参阅Reading Directly from a URL

Java中的URL是否有等效的FileReader？

2 个答案: