我在Java中使用POST方法时遇到411 HTTP错误 [英] I am getting 411 HTTP Error while using POST method in Java

问题描述

如今在Java中使用POST方法时遇到问题.我收到了

I am facing a problem while using POST Method in Java nowadays. I am receiving

线程"main"中的异常java.lang.RuntimeException:服务器返回URL的HTTP响应代码:411.

我在任何地方都找不到任何可用的文档.它们都没有用.我该如何解决?

I couldn't find any available document anywhere. None of them were useful. How do I fix it?

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class req {
    public static void main(String[] args) {
        sendPostRequest(requestURL);
    }

    private static String sendPostRequest(String requestUrl) {
        StringBuilder jsonString = new StringBuilder();
        try {
            URL url = new URL(requestUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            byte[] data = requestUrl.getBytes("UTF-8");


            connection.setDoInput(true);
            connection.setDoOutput(true);
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Accept", "application/json");
            connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
            connection.setRequestProperty("Content-Length", String.valueOf(data.length));
            connection.setRequestProperty("Authorization", "Basic " + "usename:password");

            BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            while ((line = br.readLine()) != null) {
                jsonString.append(line);
            }
            br.close();
            connection.disconnect();
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage());
        }

        return jsonString.toString();
    }
}

推荐答案

完全有效的方法:

public String sendPostRequest(String requestURL, HashMap<String, String> postDataParams) {

    URL url;
    String response = "";
    try {
        url = new URL(requestURL);

        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setReadTimeout(15000);
        conn.setConnectTimeout(15000);
        conn.setRequestMethod("POST");
        conn.setDoInput(true);
        conn.setDoOutput(true);


        OutputStream os = conn.getOutputStream();
        BufferedWriter writer = new BufferedWriter(
                new OutputStreamWriter(os, "UTF-8"));
        writer.write(getPostDataString(postDataParams));

        writer.flush();
        writer.close();
        os.close();
        int responseCode=conn.getResponseCode();

        if (responseCode == HttpsURLConnection.HTTP_OK) {
            BufferedReader br=new BufferedReader(new InputStreamReader(conn.getInputStream()));
            response = br.readLine();
        }
        else {
            response="Error Registering";
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    return response;
}


private String getPostDataString(HashMap<String, String> params) throws UnsupportedEncodingException {
        StringBuilder result = new StringBuilder();
        boolean first = true;
        for(Map.Entry<String, String> entry : params.entrySet()){
            if (first)
                first = false;
            else
                result.append("&");

            result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
            result.append("=");
            result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
        }

        return result.toString();
    }

如果您在响应中返回JSON:

If you are returning a JSON in your response:

public JSONObject getPostResult(String json){
    if(!json.isEmpty()) {
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON_ERROR", "Error parsing data " + e.toString());
        }
    }
    return jObj;
}

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