Java:如何使用 UrlConnection 发布授权请求？

Question

我想向需要身份验证的服务器生成 POST 请求。我尝试使用以下方法:

private synchronized String CreateNewProductPOST (String urlString, String encodedString, String title, String content, Double price, String tags) {

    String data = "product[title]=" + URLEncoder.encode(title) +
                "&product[content]=" + URLEncoder.encode(content) + 
                "&product[price]=" + URLEncoder.encode(price.toString()) +
                "&tags=" + tags;
    try {
        URL url = new URL(urlString);
        URLConnection conn;
        conn = url.openConnection();
        conn.setRequestProperty ("Authorization", "Basic " + encodedString);
        conn.setDoOutput(true);
        conn.setDoInput(true);
        OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
        wr.write(data);
        wr.flush(); 
        // Get the response 
        BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream())); 
        String line; 
        while ((line = rd.readLine()) != null) { 
            // Process line... 
            } 
        wr.close(); 
        rd.close(); 
        return rd.toString();
    } catch (MalformedURLException e) {

        e.printStackTrace();
        return e.getMessage();
    }
    catch (IOException e) {

        e.printStackTrace();
        return e.getMessage();
    } 
}

但服务器没有收到授权数据。应该添加授权数据的行如下:

conn.setRequestProperty ("Authorization", "Basic " + encodedString);

和线

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

还会引发 IOException。

无论如何，如果有人可以建议对上述逻辑进行任何修复，以便使用带有 UrlConnection 的 POST 启用授权，我将非常感激。

但显然它不能按预期工作，尽管如果对 GET 请求使用相同的逻辑，一切正常。

Answer 1

罚款example found here . Powerlord没看错，below , 对于 POST，您需要 HttpURLConnection , 而不是。

以下是执行此操作的代码，

    URL url = new URL(urlString);
    URLConnection conn = url.openConnection();
    conn.setDoOutput(true);
    conn.setRequestProperty ("Authorization", encodedCredentials);

    OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());

    writer.write(data);
    writer.flush();
    String line;
    BufferedReader reader = new BufferedReader(new 
                                     InputStreamReader(conn.getInputStream()));
    while ((line = reader.readLine()) != null) {
      System.out.println(line);
    }
    writer.close();
    reader.close();

将URLConnection改为HttpURLConnection，使其成为POST请求。

    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setRequestMethod("POST");

建议(...在评论中):

您可能还需要设置这些属性，

conn.setRequestProperty( "Content-type", "application/x-www-form-urlencoded");
conn.setRequestProperty( "Accept", "*/*" );