Question

嗨，下面是这段代码。在下面的代码中，当我写完后关闭写程序时，服务器给出了预期的结果。但是，如果在最终阻止中关闭它，则会返回400错误请求。有这种现象的原因吗？

BufferedReader br = null;
HttpURLConnection conn = null;
OutputStreamWriter writer = null;
String ip = "test"
try {
    URL url = new URL(http://someurl));
    conn = (HttpURLConnection) url.openConnection();
    conn.setDoInput(true);
    conn.setDoOutput(true);
    conn.setRequestMethod("POST");
    conn.setConnectTimeout(0);
    conn.setRequestProperty("Content-Type", "application/json");
    writer = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
    writer.write(ip);
    // writer.close();

    br = new BufferedReader(new InputStreamReader(conn.getInputStream()));

    String line;
    while ((line = br.readLine()) != null) {
        jsonString.append(line);
    }
} catch (final Exception e) {
    LOG.error("Error" + e);
}
finally 
{
    //Closing writer in finally block.
    if(writer != null)
    {
        try 
        {
            writer.close();
        } 
        catch (IOException e) {                      
            LOG.error("Error in closing Writer", e);
        }
    }
    if (br != null) 
    {
       try 
       {
            br.close();
        } 
        catch (final IOException e) 
        {
            LOG.error("Error: ", e);
        } 
    }
    if(conn != null){
        conn.disconnect();
    }             
}

Answer 1

您需要将内容刷新到服务器。完成写入请求后，在读取响应之前，请使用writer.flush（）而不是writer.close（）。

IOException：服务器返回了400个错误代码

1 个答案: