post to a URL and set HTTP connection parameter, connection status, charset, content-type - Android Network

Android examples for Network:Network Connection

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Description

post to a URL and set HTTP connection parameter, connection status, charset, content-type

Demo Code


//package com.java2s;

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import java.net.HttpURLConnection;
import java.net.URL;

import java.util.Map;

public class Main {

    public static String post(String actionUrl, Map<String, String> params,
            Map<String, File> files) throws IOException {
        String BOUNDARY = java.util.UUID.randomUUID().toString();
        String PREFIX = "--", LINEND = "\r\n";
        String MULTIPART_FROM_DATA = "multipart/form-data";
        String CHARSET = "UTF-8";
        URL uri = new URL(actionUrl);
        HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
        conn.setReadTimeout(5 * 1000); // 
        conn.setDoInput(true);// 
        conn.setDoOutput(true);// 
        conn.setUseCaches(false); // 
        conn.setRequestMethod("POST");
        conn.setRequestProperty("connection", "keep-alive");
        conn.setRequestProperty("Charsert", "UTF-8");
        conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA
                + ";boundary=" + BOUNDARY);
        // /*from   w  w  w. j  a v  a  2  s  .  com*/
        StringBuilder sb = new StringBuilder();
        for (Map.Entry<String, String> entry : params.entrySet()) {
            sb.append(PREFIX);
            sb.append(BOUNDARY);
            sb.append(LINEND);
            sb.append("Content-Disposition: form-data; name=\""
                    + entry.getKey() + "\"" + LINEND);
            sb.append("Content-Type: text/plain; charset=" + CHARSET
                    + LINEND);
            sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
            sb.append(LINEND);
            sb.append(entry.getValue());
            sb.append(LINEND);
        }

        DataOutputStream outStream = new DataOutputStream(
                conn.getOutputStream());
        outStream.write(sb.toString().getBytes());
        // 
        if (files != null)
            for (Map.Entry<String, File> file : files.entrySet()) {
                StringBuilder sb1 = new StringBuilder();
                sb1.append(PREFIX);
                sb1.append(BOUNDARY);
                sb1.append(LINEND);
                sb1.append("Content-Disposition: form-data; name=\"file\"; filename=\""
                        + file.getKey() + "\"" + LINEND);
                sb1.append("Content-Type: application/octet-stream; charset="
                        + CHARSET + LINEND);
                sb1.append(LINEND);
                outStream.write(sb1.toString().getBytes());
                InputStream is = new FileInputStream(file.getValue());
                byte[] buffer = new byte[1024];
                int len = 0;
                while ((len = is.read(buffer)) != -1) {
                    outStream.write(buffer, 0, len);
                }
                is.close();
                outStream.write(LINEND.getBytes());
            }
        // 
        byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
        outStream.write(end_data);
        outStream.flush();
        // 
        int res = conn.getResponseCode();
        InputStream in = null;
        if (res == 200) {
            in = conn.getInputStream();
            int ch;
            StringBuilder sb2 = new StringBuilder();
            while ((ch = in.read()) != -1) {
                sb2.append((char) ch);
            }
        }
        outStream.close();
        conn.disconnect();
        return in.toString();
    }
}

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