Java tutorial
/* * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.openideals.android.net; import java.io.BufferedReader; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.InputStream; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.Enumeration; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Properties; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.mime.MultipartEntity; import org.apache.http.entity.mime.content.FileBody; import org.apache.http.entity.mime.content.StringBody; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.apache.http.protocol.HTTP; import android.util.Log; /* * General HTTP handler class */ public class HttpManager { private final static String TAG = "HttpManager"; private final static String POST_MIME_TYPE = "application/x-www-form-urlencoded"; private final static String POST_MIME_TYPE_FILE = "multipart/form-data"; public static String doGet(String serviceEndpoint, Properties props) throws Exception { HttpClient httpClient = new DefaultHttpClient(); StringBuilder uriBuilder = new StringBuilder(serviceEndpoint); StringBuffer sbResponse = new StringBuffer(); Enumeration<Object> enumProps = props.keys(); String key, value = null; uriBuilder.append('?'); while (enumProps.hasMoreElements()) { key = (String) enumProps.nextElement(); value = (String) props.get(key); uriBuilder.append(key); uriBuilder.append('='); uriBuilder.append(java.net.URLEncoder.encode(value)); uriBuilder.append('&'); } HttpGet request = new HttpGet(uriBuilder.toString()); HttpResponse response = httpClient.execute(request); int status = response.getStatusLine().getStatusCode(); // we assume that the response body contains the error message if (status != HttpStatus.SC_OK) { ByteArrayOutputStream ostream = new ByteArrayOutputStream(); response.getEntity().writeTo(ostream); Log.e("HTTP CLIENT", ostream.toString()); return null; } else { InputStream content = response.getEntity().getContent(); // <consume response> BufferedReader reader = new BufferedReader(new InputStreamReader(content)); String line; while ((line = reader.readLine()) != null) sbResponse.append(line); content.close(); // this will also close the connection } return sbResponse.toString(); } public static String doPost(String serviceEndpoint, Properties props) throws Exception { HttpClient httpClient = new DefaultHttpClient(); HttpPost request = new HttpPost(serviceEndpoint); HttpResponse response = null; HttpEntity entity = null; StringBuffer sbResponse = new StringBuffer(); Enumeration<Object> enumProps = props.keys(); String key, value = null; List<NameValuePair> nvps = new ArrayList<NameValuePair>(); while (enumProps.hasMoreElements()) { key = (String) enumProps.nextElement(); value = (String) props.get(key); nvps.add(new BasicNameValuePair(key, value)); Log.i(TAG, "adding nvp:" + key + "=" + value); } UrlEncodedFormEntity uf = new UrlEncodedFormEntity(nvps, HTTP.UTF_8); Log.i(TAG, uf.toString()); request.setEntity(uf); request.setHeader("Content-Type", POST_MIME_TYPE); Log.i(TAG, "http post request: " + request.toString()); // Post, check and show the result (not really spectacular, but works): response = httpClient.execute(request); entity = response.getEntity(); int status = response.getStatusLine().getStatusCode(); // we assume that the response body contains the error message if (status != HttpStatus.SC_OK) { ByteArrayOutputStream ostream = new ByteArrayOutputStream(); entity.writeTo(ostream); Log.e(TAG, " error status code=" + status); Log.e(TAG, ostream.toString()); return null; } else { InputStream content = response.getEntity().getContent(); // <consume response> BufferedReader reader = new BufferedReader(new InputStreamReader(content)); String line; while ((line = reader.readLine()) != null) sbResponse.append(line); content.close(); // this will also close the connection return sbResponse.toString(); } } public static String uploadFile(String serviceEndpoint, Properties properties, String fileParam, String file) throws Exception { HttpClient httpClient = new DefaultHttpClient(); HttpPost request = new HttpPost(serviceEndpoint); MultipartEntity entity = new MultipartEntity(); Iterator<Map.Entry<Object, Object>> i = properties.entrySet().iterator(); while (i.hasNext()) { Map.Entry<Object, Object> entry = (Map.Entry<Object, Object>) i.next(); String key = (String) entry.getKey(); String val = (String) entry.getValue(); entity.addPart(key, new StringBody(val)); } File upload = new File(file); Log.i("httpman", "upload file (" + upload.getAbsolutePath() + ") size=" + upload.length()); entity.addPart(fileParam, new FileBody(upload)); request.setEntity(entity); HttpResponse response = httpClient.execute(request); int status = response.getStatusLine().getStatusCode(); if (status != HttpStatus.SC_OK) { } else { } return response.toString(); } }