Java HTTP Response getResponse(HttpURLConnection httpConn, StringBuilder responseContent, StringBuilder responseCode, HashMap headers)

Description

Get the response content and headers as string

License

Apache License

Parameter

Parameter	Description
httpConn	a parameter

Exception

Parameter	Description
IOException	an exception

Declaration

public static void getResponse(HttpURLConnection httpConn, StringBuilder responseContent,
        StringBuilder responseCode, HashMap<String, String> headers) throws IOException 

Method Source Code

//package com.java2s;
// Licensed under the Apache License, Version 2.0 (the "License");

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URLConnection;
import java.util.HashMap;

public class Main {
    /**//from   ww w.  ja  v  a2 s. c o  m
     * Get the response content and headers as string
     * 
     * @param httpConn
     * @return
     * @throws IOException
     */
    public static void getResponse(HttpURLConnection httpConn, StringBuilder responseContent,
            StringBuilder responseCode, HashMap<String, String> headers) throws IOException {
        String s = getResponseContent(httpConn);
        responseContent.setLength(0);
        responseContent.append(s);

        s = getResponseHeaders(httpConn, headers);
        responseCode.setLength(0);
        responseCode.append(s);

        return;
    }

    /**
     * Get the response (or error response) as a string
     * 
     * @param httpConn
     * @return
     * @throws IOException
     */
    public static String getResponseContent(HttpURLConnection httpConn) throws IOException {
        try {
            if (httpConn.getInputStream() == null) {
                return null;
            } else {
                StringBuilder sb = new StringBuilder();
                BufferedReader in = new BufferedReader(new InputStreamReader(httpConn.getInputStream()));
                String str;
                while ((str = in.readLine()) != null) {
                    sb.append(str + "\n");
                }
                in.close();

                return sb.toString();
            }
        } catch (Exception ex) {
            return getResponseErrorContent(httpConn);
        }
    }

    /**
     * Gets the headers
     * 
     * @param conn
     * @param headers
     * @return 1st response line
     */
    public static String getResponseHeaders(URLConnection conn, HashMap<String, String> headers) {
        headers.clear();
        String responseCode = "";
        for (int i = 0;; i++) {
            String name = conn.getHeaderFieldKey(i);
            String value = conn.getHeaderField(i);
            if (name == null && value == null) {
                break;
            }
            if (name == null) {
                responseCode = value;
            } else {
                headers.put(name, value);
            }
        }
        return responseCode;
    }

    /**
     * Gets the error response as a string
     * 
     * @param httpConn
     * @return
     * @throws IOException
     */
    public static String getResponseErrorContent(HttpURLConnection httpConn) throws IOException {
        if (httpConn.getErrorStream() == null) {
            return null;
        } else {
            StringBuilder sb = new StringBuilder();
            BufferedReader in = new BufferedReader(new InputStreamReader(httpConn.getErrorStream()));
            String str;
            while ((str = in.readLine()) != null) {
                sb.append(str + "\n");
            }
            in.close();

            return sb.toString();
        }
    }
}

Related

1. getResourceLastModified(URLConnection connection)
2. getResourceModifiedTime(URL url)
3. getResponse(URL request)
4. getResponse(URL url)
5. getResponseAsString(HttpURLConnection conn)
6. getResponseBody(HttpURLConnection conn)