Android Http编程之HttpClient
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- package com.lingdududu.http;
- import java.io.InputStream;
- import org.apache.http.HttpResponse;
- import org.apache.http.HttpStatus;
- import org.apache.http.client.HttpClient;
- import org.apache.http.client.methods.HttpGet;
- import org.apache.http.impl.client.DefaultHttpClient;
- import android.app.Activity;
- import android.os.Bundle;
- import android.util.Log;
- public class HttpGetActivity extends Activity {
- String uri = "http://developer.android.com/";
- final String TAG_STRING = "TAG";
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- try {
- //得到HttpClient对象
- HttpClient getClient = new DefaultHttpClient();
- //得到HttpGet对象
- HttpGet request = new HttpGet(uri);
- //客户端使用GET方式执行请教,获得服务器端的回应response
- HttpResponse response = getClient.execute(request);
- //判断请求是否成功
- if(response.getStatusLine().getStatusCode()==HttpStatus.SC_OK){
- Log.i(TAG_STRING, "请求服务器端成功");
- //获得输入流
- InputStream inStrem = response.getEntity().getContent();
- int result = inStrem.read();
- while (result != -1){
- System.out.print((char)result);
- result = inStrem.read();
- }
- //关闭输入流
- inStrem.close();
- }else {
- Log.i(TAG_STRING, "请求服务器端失败");
- }
- } catch (Exception e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- }
- }
- package com.androidbook.services.httppost;
- import java.io.BufferedReader;
- import java.io.IOException;
- import java.io.InputStreamReader;
- import java.util.ArrayList;
- import java.util.List;
- import org.apache.http.HttpResponse;
- import org.apache.http.NameValuePair;
- import org.apache.http.client.HttpClient;
- import org.apache.http.client.entity.UrlEncodedFormEntity;
- import org.apache.http.client.methods.HttpPost;
- import org.apache.http.impl.client.DefaultHttpClient;
- import org.apache.http.message.BasicNameValuePair;
- import android.app.Activity;
- import android.os.Bundle;
- public class HttpPostActivity extends Activity {
- String uri = "http://developer.android.com/";
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- BufferedReader in = null;
- try {
- HttpClient client = new DefaultHttpClient();
- HttpPost request = new HttpPost("http://code.google.com/android/");
- //使用NameValuePair来保存要传递的Post参数
- List<NameValuePair> postParameters = new ArrayList<NameValuePair>();
- //添加要传递的参数
- postParameters.add(new BasicNameValuePair("id", "12345"));
- postParameters.add(new BasicNameValuePair("username", "dave"));
- //实例化UrlEncodedFormEntity对象
- UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(
- postParameters);
- /*
- 可以用UrlEncodedFormEntity的第二个参数指定编码类型HTTP.UTF_8
- UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity( postParameters,HTTP.UTF_8);
- */
- //使用HttpPost对象来设置UrlEncodedFormEntity的Entity
- request.setEntity(formEntity);
- HttpResponse response = client.execute(request);
- if(response.getStatusLine().getStatusCode()==200) {
/*String msg=EntityUtils.toString(response.getEntity());//String msg=EntityUtils.toString(response.getEntity(),"utf-8");return msg;或者*/Byte[] data =EntityUtils.toByteArray(response.getEntity());Byte[] data =EntityUtils.toByteArray(response.getEntity(),"utf-8");return data;InputStream is =response.getEntity().getContent();
- in = new BufferedReader(new InputStreamReader(is));
- StringBuffer string = new StringBuffer("");
- String lineStr = "";
- while ((lineStr = in.readLine()) != null) {
- string.append(lineStr + "\n");
- }
- in.close();
- String resultStr = string.toString();
- System.out.println(resultStr);
- } catch(Exception e) {
- // Do something about exceptions
- } finally {
- if (in != null) {
- try {
- in.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- httpClient.getConnectionManager().shutdo
- }
- }
- }
2.2. Apache接口
Apache HttpClient 是一个开源项目,弥补了 java.net.* 灵活性不足的缺点,为客户端的HTTP编程提供高效、最新、功能丰富的工具包支持。Android 平台引入了 Apache HttpClient 的同时还提供了对它的一些封装和扩展,例如设置缺省的HTTP超时和缓存大小等。早期的 Android 曾同时包括 Commons HttpClient(org.apache.commons.httpclient.*) 和 HttpComponents (org.apache.http.client.* ),不过当前版本 (1.5) 中开发者只能使用后者,也就是说类似以下的一些类:
使用这部分接口的基本操作与 java.net.* 基本类似,主要包括:
·创建 HttpClient 以及 GetMethod / PostMethod, HttpRequest 等对象
·设置连接参数
·执行 HTTP 操作
·处理服务器返回结果
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.params. HttpConnectionParams;
import org.apache.http.client.params. HttpClientParams;
try {
// 创建 HttpParams 以用来设置 HTTP 参数(这一部分不是必需的)
HttpParams params = new BasicHttpParams();
// 设置连接超时和 Socket 超时,以及 Socket 缓存大小
HttpConnectionParams.setConnectionTimeout(params, 20 * 1000);
HttpConnectionParams.setSoTimeout(params, 20 * 1000);
HttpConnectionParams.setSocketBufferSize(params, 8192);
// 设置重定向,缺省为 true
HttpClientParams.setRedirecting(params, true);
// 设置 user agent
HttpProtocolParams.setUserAgent(params, userAgent);
// 创建一个 HttpClient 实例
// 注意 HttpClient httpClient = new HttpClient(); 是Commons HttpClient
// 中的用法,在 Android 1.5 中我们需要使用 Apache 的缺省实现 DefaultHttpClient
HttpClient httpClient = new DefaultHttpClient(params);
// 创建 HttpGet 方法,该方法会自动处理 URL 地址的重定向
HttpGet httpGet = new HttpGet ("http://www.test_test.com/");
HttpResponse response = client.execute(httpGet);
if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
// 错误处理,例如可以在该请求正常结束前将其中断
httpGet.abort();
}
// 读取更多信息
Header[] headers = response.getHeaders();
HttpEntity entity = response.getEntity();
Header header = response.getFirstHeader("Content-Type");
} catch (Exception ee) {
//
} finally {
// 释放连接
client.getConnectionManager().shutdown();
}
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.params. HttpConnectionParams;
import org.apache.http.client.params. HttpClientParams;
try {
// 创建 HttpParams 以用来设置 HTTP 参数(这一部分不是必需的)
HttpParams params = new BasicHttpParams();
// 设置连接超时和 Socket 超时,以及 Socket 缓存大小
HttpConnectionParams.setConnectionTimeout(params, 20 * 1000);
HttpConnectionParams.setSoTimeout(params, 20 * 1000);
HttpConnectionParams.setSocketBufferSize(params, 8192);
// 设置重定向,缺省为 true
HttpClientParams.setRedirecting(params, true);
// 设置 user agent
HttpProtocolParams.setUserAgent(params, userAgent);
// 创建一个 HttpClient 实例
// 注意 HttpClient httpClient = new HttpClient(); 是Commons HttpClient
// 中的用法,在 Android 1.5 中我们需要使用 Apache 的缺省实现 DefaultHttpClient
HttpClient httpClient = new DefaultHttpClient(params);
// 创建 HttpGet 方法,该方法会自动处理 URL 地址的重定向
HttpGet httpGet = new HttpGet ("http://www.test_test.com/");
HttpResponse response = client.execute(httpGet);
if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {HttpStatus.SC_OK是200
// 错误处理,例如可以在该请求正常结束前将其中断
httpGet.abort();
}
// 读取更多信息
Header[] headers = response.getHeaders();
HttpEntity entity = response.getEntity();
Header header = response.getFirstHeader("Content-Type");
} catch (Exception ee) {
//
} finally {
// 释放连接
client.getConnectionManager().shutdown();
}
以下例子以 HttpGet 方式通过代理访问 HTTPS 网站:
try {
HttpClient httpClient = new HttpClient();
// 设置认证的数据
httpClient.getCredentialsProvider().setCredentials(
new AuthScope("your_auth_host", 80, "your_realm"),
new UsernamePasswordCredentials("username", "password"));
// 设置服务器地址,端口,访问协议
HttpHost targetHost = new HttpHost("www.test_test.com", 443, "https");
// 设置代理
HttpHost proxy = new HttpHost("192.168.1.1", 80);
httpClient.getParams().setParameter
(ConnRoutePNames.DEFAULT_PROXY, proxy);
// 创建一个 HttpGet 实例
HttpGet httpGet = new HttpGet("/a/b/c");
// 连接服务器并获取应答数据
HttpResponse response = httpClient.execute(targetHost, httpGet);
// 读取应答数据
int statusCode = response.getStatusLine().getStatusCode();
Header[] headers = response.getHeaders();
HttpEntity entity = response.getEntity();
} catch (Exception ee) {
//
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