java - httpPost setEntity 始终为空

Question

我正在尝试向 node.js 服务器发帖，但出于某种原因，无论我尝试什么，正文对我来说总是空的。我现在正在对 requestb.in 进行测试，它在那里也总是空的。

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();
}

这是请求b.in http://requestb.in/14a9s7m1?inspect原始正文应该包含 json 字符串，对吗？

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)，但 we should use HttpUrlConnection相反，您的方法是正确的(从 Android 的角度来看)。

当使用名为 DavidWebb 的非常轻量级的 HttpUrlConnection 包装器时，代码如下所示(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);
    }

}

当我发布的 JSON 类似于您的示例时，requestb.in 会接受它:

    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)

tl;dr

• 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，您可以调试您的 node.js 代码(或 console.log(req))或使用类似 Wireshark 的工具.