post JSON to URL - Java Network

Java examples for Network:URL

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Description

post JSON to URL

Demo Code


//package com.java2s;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

import java.io.Reader;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.ProtocolException;
import java.net.URL;

public class Main {
    public static void postJSON(String json, URL endpoint, Writer output)
            throws Exception {
        HttpURLConnection urlc = null;
        try {/*  w  w w  . j  a  va 2  s  .c  om*/
            urlc = (HttpURLConnection) endpoint.openConnection();

            try {
                urlc.setRequestMethod("POST");
            } catch (ProtocolException e) {
                throw new Exception(
                        "Shouldn't happen: HttpURLConnection doesn't support POST??",
                        e);
            }

            urlc.setDoOutput(true);
            urlc.setDoInput(true);
            urlc.setUseCaches(false);
            urlc.setAllowUserInteraction(false);
            urlc.setRequestProperty("Content-type", "application/xml;"); //"text/xml; charset=" + "UTF-8");
            OutputStream out = urlc.getOutputStream();

            try {
                Writer writer = new OutputStreamWriter(out, "UTF-8");
                writer.write(json);
                writer.flush();
                writer.close();
            } catch (IOException e) {
                throw new Exception("IOException while posting data", e);
            } finally {
                if (out != null)
                    out.close();
            }

            InputStream in = urlc.getInputStream();
            try {
                Reader reader = new InputStreamReader(in);
                pipe(reader, output);
                reader.close();
            } catch (IOException e) {
                throw new Exception("IOException while reading response", e);
            } finally {
                if (in != null)
                    in.close();
            }
        } catch (IOException e) {
            throw new Exception("Connection error (is server running at "
                    + endpoint + " ?): " + e);
        } finally {
            if (urlc != null)
                urlc.disconnect();
        }
    }

    /**
     * Pipes everything from the reader to the writer via a buffer
     */
    private static void pipe(Reader reader, Writer writer)
            throws IOException {
        char[] buf = new char[1024];
        int read = 0;
        while ((read = reader.read(buf)) >= 0) {
            writer.write(buf, 0, read);
        }
        writer.flush();
    }
}

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