Question

我正在尝试向node.js服务器发帖子但是由于某种原因，无论我尝试什么，身体对我来说总是空的。我现在正在测试requestb.in，它也总是空着。

这是我用于发布的代码：

public static String post(String url, String json) {
    StringBuilder stringBuffer = new StringBuilder();
    BufferedReader bufferedReader = null;
    try {
        HttpClient httpClient = new DefaultHttpClient();
        HttpContext localContext = new BasicHttpContext();
        HttpPost httpPost = new HttpPost("http://requestb.in/14a9s7m1");
        StringEntity se = new StringEntity("{'string':'string'}", HTTP.UTF_8);
        se.setContentType("application/json; charset=UTF-8");
        httpPost.setEntity(se);
        httpPost.setHeader("Accept", "application/json");
        httpPost.setHeader("Content-type", "application/json");
        httpPost.setHeader("hmac", Methods.getMethods().getHmac(json));

        HttpResponse httpResponse = httpClient.execute(httpPost, localContext);
        InputStream inputStream = httpResponse.getEntity().getContent();
        bufferedReader = new BufferedReader(new InputStreamReader(inputStream));

        String readLine = bufferedReader.readLine();
        while (readLine != null) {
            stringBuffer.append(readLine);
            stringBuffer.append("\n");
            readLine = bufferedReader.readLine();
        }
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (bufferedReader != null) {
            try {
                bufferedReader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return stringBuffer.toString();
}

这是requestb.in http://requestb.in/14a9s7m1?inspect raw body应该包含json字符串，对吧？

有什么建议吗？

Answer 1

使用HttpUrlConnection时可能会犯很多错误。我承认我没有看到任何错误，但这并不意味着什么。

由于Google不建议使用HttpClient和AndroidHttpClient（FROYO或更早版本除外），而是使用we should use HttpUrlConnection，因此您采用正确的方式（从Android角度来看）。

当为名为DavidWebb的HttpUrlConnection使用非常轻量级的包装器时，代码看起来像这样（我省略了hmac-generation）：

public class TestWebbRequestBin {

    @Test public void stackOverflow20543115() throws Exception {
        Webb webb = Webb.create();
        webb.setBaseUri("http://requestb.in");

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("string", "string");
        String json = jsonObject.toString(); // {"string":"string"}

        Response<String> response = webb
                .post("/1g7afwn1")
                .header("Accept", "application/json")
                .header("Content-type", "application/json")
                .header("hmac", "some-hmac-just-a-test")
                .body(json)
                .asString();

        assertEquals(200, response.getStatusCode());
        assertTrue(response.isSuccess());

        String body = response.getBody();
        assertEquals("ok\n", body);
    }

}

当我的帖子中的JSON发布时，requestb.in确实接受了它：

    json = "{'string':'string'}";

但这不是有效的JSON（这里在node.js中测试过）：

> JSON.parse("{'string':'string'}")
    SyntaxError: Unexpected token '
    at Object.parse (native)
    at repl:1:7
    at REPLServer.self.eval (repl.js:110:21)
    at Interface.<anonymous> (repl.js:239:12)

<强> TL;博士

注意发送有效的JSON
掌握HttpUrlConnection或使用简单的抽象库

对于讨厌的错误，您可以调试node.js代码（或console.log(req)）或使用Wireshark之类的工具。

Answer 2

尝试使用此代码发送字符串....在HttpPost中，您应该使用键值对来发送数据。

HttpPost httppost = new HttpPost(SERVER_URL);
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("REQUEST", req));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
HttpResponse response = httpclient.execute(httppost);

Answer 3

我无法让HttpPost工作，但是HttpUrlConnection可以工作。它解决了我的问题，但没有解决httpPost的神秘无身体问题。

这是我的解决方案：

public static String post(String ur2l, String json) {
    StringBuilder stringBuffer = new StringBuilder();
    BufferedReader bufferedReader = null;
    try {
        URL url = new URL(ur2l);
        HttpURLConnection conn;
        conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Accept", "application/json");
        conn.setRequestProperty("Content-type", "application/json");
        conn.setRequestProperty("hmac", Methods.getMethods().getHmac(json));
        conn.setDoOutput(true);

        OutputStream os = null;
        try {
            os = conn.getOutputStream();
            os.write(json.getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        }
        os.close();

        conn.connect();
        int respCode = conn.getResponseCode();

        if (respCode == 200) {
            InputStream inputStream = conn.getInputStream();
            bufferedReader = new BufferedReader(new InputStreamReader(inputStream));

            String readLine = bufferedReader.readLine();
            while (readLine != null) {
                stringBuffer.append(readLine);
                stringBuffer.append("\n");
                readLine = bufferedReader.readLine();
            }
        }
    } catch (MalformedURLException e1) {
        e1.printStackTrace();
    } catch (IOException e1) {
        e1.printStackTrace();
    } finally {
        if (bufferedReader != null) {
            try {
                bufferedReader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return stringBuffer.toString();
}

Answer 4

我不确定这是问题所在。你能试一试吗？

您正在发送无效的JSON格式字符串。这使得服务器无法接受您的无效json字符串，因此您的正文为空。要解决此问题，请更改以下代码。

StringEntity se = new StringEntity("{\"string\":\"string\"}", HTTP.UTF_8);

httpPost setEntity总是为空

4 个答案: