使用 BufferedReader 的 Java 中的过早 EOF 异常

问：

我正在尝试将 url（它只是文本）转换为字符串，并且我正在使用 BufferedReader 读取 url。但是，我不断收到过早的 EOF 异常。这是我到目前为止所拥有的。

 try {
        URL sUrl = new URL(url);
        String result = "";
        BufferedReader br = null;
        try {
            br = new BufferedReader(new InputStreamReader(sUrl.openStream()));
            String av;
            while ((av = br.readLine()) != null) {
                result += av;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        System.out.println(result.length());
    } catch (Exception e) {
        e.printStackTrace();
    }

此外，我尝试实现此解决方案，我在另一个 stackoverflow 线程上看到了该解决方案。

try {
        URL oracle = new URL(url);
        BufferedReader in = new BufferedReader(
                new InputStreamReader(oracle.openStream()));

        StringBuffer input = new StringBuffer();
        int BUFFER_SIZE = 2000000;
        char[] buffer = new char[BUFFER_SIZE];
        int charsRead = 0;
        while ((charsRead = in.read(buffer, 0, BUFFER_SIZE)) != -1) {
            input.append(buffer, 0, charsRead);
        }
        in.close();
        System.out.println(input.toString().length());

    } catch (Exception e) {
        e.printStackTrace();
    }

这两种方法都会导致在我代码的 .read / .readLine 部分发生相同的错误。

这是堆栈跟踪。

java.io.IOException: Premature EOF
at java.base/sun.net.www.http.ChunkedInputStream.fastRead(ChunkedInputStream.java:257)
at java.base/sun.net.www.http.ChunkedInputStream.read(ChunkedInputStream.java:689)
at java.base/java.io.FilterInputStream.read(FilterInputStream.java:133)
at java.base/sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:3501)
at java.base/sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
at java.base/sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
at java.base/sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
at java.base/java.io.InputStreamReader.read(InputStreamReader.java:185)
at java.base/java.io.BufferedReader.fill(BufferedReader.java:161)
at java.base/java.io.BufferedReader.readLine(BufferedReader.java:326)
at java.base/java.io.BufferedReader.readLine(BufferedReader.java:392)
at com.github.doomsdayrs.jikan4java.ExampleClass.main(ExampleClass.java:99)