HttpClient是Apache Jakarta Common下的子项目，用来提供高效的、最新的、功能丰富的支持HTTP协议的客户端编程工具包，并且它支持HTTP协议最新的版本和建议。HttpClient已经应用在很多的项目中，比如Apache Jakarta上很著名的另外两个开源项目Cactus和HTMLUnit都使用了HttpClient。
HttpClient:是一个接口.
特性：
1. 基于标准、纯净的java语言。实现了Http1.0和Http1.1
2. 以可扩展的面向对象的结构实现了Http全部的方法（GET, POST, PUT, DELETE, HEAD, OPTIONS, and TRACE）。
3. 支持HTTPS协议。
4. 通过Http代理建立透明的连接。
5. 利用CONNECT方法通过Http代理建立隧道的https连接。
6. Basic, Digest, NTLMv1, NTLMv2, NTLM2 Session, SNPNEGO/Kerberos认证方案。
7. 插件式的自定义认证方案。
8. 便携可靠的套接字工厂使它更容易的使用第三方解决方案。
9. 连接管理器支持多线程应用。支持设置最大连接数，同时支持设置每个主机的最大连接数，发现并关闭过期的连接。
10. 自动处理Set-Cookie中的Cookie。
11. 插件式的自定义Cookie策略。
12. Request的输出流可以避免流中内容直接缓冲到socket服务器。
13. Response的输入流可以有效的从socket服务器直接读取相应内容。
14. 在http1.0和http1.1中利用KeepAlive保持持久连接。
15. 直接获取服务器发送的response code和 headers。
16. 设置连接超时的能力。
17. 实验性的支持http1.1 response caching。
18. 源代码基于Apache License 可免费获取。
案例效果图：
MainActivity.java
public class MainActivity extends Activity implements OnClickListener {
public static String urls = "http://gpj.zhangwoo.cn/app.php?platform=android&appkey=5a379b5eed8aaae531df5f60b12100cfb6dff2c1";
private TextView mTextView;
private ImageView imagegvoew;
String resultStr = "";
String resultStr1 = "";
private Bitmap mBitmap = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
findViewById(R.id.btn1).setOnClickListener(this);
findViewById(R.id.btn2).setOnClickListener(this);
findViewById(R.id.btn3).setOnClickListener(this);
findViewById(R.id.btn4).setOnClickListener(this);
mTextView = (TextView) findViewById(R.id.Text);
imagegvoew = (ImageView) findViewById(R.id.imagegvoew);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn1:
Thread visitBaiduThread = new Thread(new VisitWebRunnable());
visitBaiduThread.start();
try {
visitBaiduThread.join();
if (!resultStr.equals("")) {
mTextView.setText(resultStr);
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case R.id.btn2:
Thread visitBaiduThreads = new Thread(new VisitWebRunnables());
visitBaiduThreads.start();
try {
visitBaiduThreads.join();
if (!resultStr1.equals("")) {
mTextView.setText(resultStr1);
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case R.id.btn3:
new DownImgAsyncTask()
.execute("http://avatar.csdn.net/8/6/0/2_dickyqie.jpg");
break;
case R.id.btn4:
//Util.addFile("url");//图片路径
break;
default:
break;
}
}
/** 这里重写handleMessage方法，接受到子线程数据后更新UI **/
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
// 关闭
imagegvoew.setImageBitmap(mBitmap);
break;
}
}
};
class DownImgAsyncTask extends AsyncTask {
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
}
@Override
protected Bitmap doInBackground(String... params) {
// TODO Auto-generated method stub
Bitmap b = Util.getImageBitmap(params[0]);
return b;
}
@Override
protected void onPostExecute(Bitmap result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if (result != null) {
imagegvoew.setImageBitmap(result);
}
}
}
/***
* get
*
* @author zq
*
*/
class VisitWebRunnable implements Runnable {
@Override
public void run() {
// TODO Auto-generated method stub
HttpClient httpCLient = new DefaultHttpClient();
// 创建get请求实例
HttpGet httpget = new HttpGet("http://www.baidu.com");
try {
HttpResponse response = httpCLient.execute(httpget);
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
String result = EntityUtils.toString(response.getEntity(),
"UTF-8");
resultStr = result;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/***
* Post
*
* @author zq
*
*/
class VisitWebRunnables implements Runnable {
@Override
public void run() {
// TODO Auto-generated method stub
List formparams = new ArrayList();
formparams.add(new BasicNameValuePair("c", "member"));
formparams.add(new BasicNameValuePair("a", "getdepartments"));
HttpClient client = null;
HttpPost request = null;
try {
client = new DefaultHttpClient();
request = new HttpPost(urls);
request.setEntity(new UrlEncodedFormEntity(formparams,
HTTP.UTF_8));
HttpResponse response = client.execute(request);
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
String result = EntityUtils.toString(response.getEntity(),
"UTF-8");
System.out.println(result);
resultStr1 = result;
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
public class Util {
/**
* 图片加载
*
* @param url
* @return
*/
public static Bitmap getImageBitmap(String url) {
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(url);
try {
HttpResponse resp = httpclient.execute(httpget);
// 判断是否正确执行
if (HttpStatus.SC_OK == resp.getStatusLine().getStatusCode()) {
// 将返回内容转换为bitmap
HttpEntity entity = resp.getEntity();
InputStream in = entity.getContent();
Bitmap mBitmap = BitmapFactory.decodeStream(in);
// 向handler发送消息，执行显示图片操作
return mBitmap;
}
} catch (Exception e) {
} finally {
httpclient.getConnectionManager().shutdown();
}
return null;
}
/***
* 上传文件
*/
public static void addFile(String url) {
CloseableHttpClient httpclient = HttpClients.createDefault();
try {
HttpPost httppost = new HttpPost(url);
FileBody bin = new FileBody(new File(url));
StringBody comment = new StringBody("A binary file of some kind",
ContentType.TEXT_PLAIN);
HttpEntity reqEntity = MultipartEntityBuilder.create()
.addPart("bin", bin).addPart("comment", comment).build();
httppost.setEntity(reqEntity);
System.out
.println("executing request " + httppost.getRequestLine());
CloseableHttpResponse response = httpclient.execute(httppost);
try {
System.out.println(response.getStatusLine());
HttpEntity resEntity = response.getEntity();
if (resEntity != null) {
System.out.println("Response content length: "
+ resEntity.getContentLength());
}
} finally {
response.close();
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
httpclient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
记得加网络权限
完成以上功能需要 httpclient.jar, httpcore.jar htttpmime.jar 点击下载即可
源码下载： http://download.csdn.net/detail/dickyqie/9707202