java.io.IOException: Premature EOF

最新推荐文章于 2024-09-25 11:28:31 发布

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本文解决了一个在HTTP访问第三方系统接口时遇到的小概率异常：java.io.IOException: PrematureEOF。通过修改读取流的方式，使用字符数组替代逐行读取，成功解决了因第三方接口可能未发送完整HTTP协议结束行导致的问题。

http访问第三方系统的接口时，小概率抛出下面的异常：

java.io.IOException: Premature EOF

public static String getHttpsContent(HttpsURLConnection conn,
        String characterCode) throws IOException {
    InputStream inputStream = conn.getInputStream();
    InputStreamReader inputStreamReader = new InputStreamReader(
            inputStream, characterCode);
    BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
    String str = null;
    StringBuffer buffer = new StringBuffer();
    while ((str = bufferedReader.readLine()) != null) {
        buffer.append(str);
    }
    // 释放资源
    bufferedReader.close();
    inputStreamReader.close();
    inputStream.close();
    conn.disconnect();
 
    return buffer.toString();
}

在

while ((str = bufferedReader.readLine()) != null) {
            buffer.append(str);
        }

while语句有时会抛出异常：

java.io.IOException: Premature EOF

at sun.net.www.http.ChunkedInputStream.readAheadBlocking(ChunkedInputStream.java:565)

搜索发现，这个是普遍性的一个问题，解决方法：

https://stackoverflow.com/questions/13210108/reading-a-web-page-in-java-ioexception-premature-eof

修改

public static String getHttpsContent(HttpsURLConnection conn, String characterCode) throws IOException {
    InputStream inputStream = conn.getInputStream();
    InputStreamReader inputStreamReader = new InputStreamReader(
            inputStream, characterCode);
    BufferedReader bufferedReader = new BufferedReader(
            inputStreamReader);
    // fix bug:  java.io.IOException: Premature EOF
    //        at sun.net.www.http.ChunkedInputStream.readAheadBlocking(ChunkedInputStream.java:565)
    // https://stackoverflow.com/questions/13210108/reading-a-web-page-in-java-ioexception-premature-eof
    StringBuffer sb = new StringBuffer();
    int BUFFER_SIZE = 1024;
    char[] buffer = new char[BUFFER_SIZE]; // or some other size,
    int charsRead = 0;
    while ( (charsRead  = bufferedReader.read(buffer, 0, BUFFER_SIZE)) != -1) {
        sb.append(buffer, 0, charsRead);
    }
 
    return sb.toString();
}

搞定。原因是第三方接口可能没有发送http协议需要的结束行。

The issue for you it may be that the server is not pushing that last end line character