Android http

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方法一：从应用程序中发起一个HTTP连接。

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ImageView iv = new ImageView(context);
iv.setId(12351);
String imageUrl = "http://i.pbase.com/o6/92/229792/1/80199697.uAs58yHk.50pxCross_of_the_Knights_Templar_svg.png"; //标准HTTP地址即可
try {
URL myurl = new URL(imageUrl);
HttpURLConnection conn = (HttpURLConnection) myurl.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(is);
is.close();
iv.setImageBitmap(bitmap);
} catch (Exception e) {
// TODO: handle exception
}
layout.addView(iv);

在Manifest.xml中加入uses-permission配置，允许进行网络访问

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.studio.crusoe.sample.android" android:versionCode="1"
android:versionName="1.0">
<uses-permission android:name="android.permission.INTERNET" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".ActivityMain" android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="2" />
</manifest>

方法二：使用Apache API：

1、使用Map来存储参数

Map<String, String> map = new HashMap<String, String>();
map.put(“name”, “wusheng”);
map.put(“password”, “pwd”);

2、使用DefaultHttpClient创建HttpClient实例

DefaultHttpClient httpClient = new DefaultHttpClient();

3、构建HttpPost

HttpPost post = new HttpPost(“http://wu-sheng.iteye.com”);

4、将由Map存储的参数转化为键值参数

List<BasicNameValuePair> postData = new ArrayList<BasicNameValuePair>();
for (Map.Entry<String, String> entry : map.entrySet()) {
postData.add(new BasicNameValuePair(entry.getKey(),
entry.getValue()));
}

5、使用编码构建Post实体

UrlEncodedFormEntity entity = new UrlEncodedFormEntity(
postData, HTTP.UTF_8);

6、设置Post实体

post.setEntity(entity);

7、执行Post方法

HttpResponse response = httpClient.execute(post);

8、获取返回实体

HttpEntity httpEntity = response.getEntity();

9、将H中返回实体转化为输入流

InputStream is = httpEntity.getContent();

10、读取输入流，即返回文本内容

StringBuffer sb = new StringBuffer();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String line = “”;
while((line=br.readLine())!=null){
sb.append(line);
}

例如：Android 通过Http访问Web端的Servlet

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//Http工具类
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 org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.util.EntityUtils;
public class HttpUtil {
public static String getHttpJSON(String url) {
HttpGet httpRequest = new HttpGet(url);
try {
HttpClient httpclient = new DefaultHttpClient();
HttpResponse httpResponse = httpclient.execute(httpRequest);
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
String jsonStr = EntityUtils.toString(httpResponse.getEntity(),
"UTF-8");
return jsonStr;
}
} catch (Exception e) {
e.printStackTrace();
System.out.println("==============e.printStackTrace() : "
+ e.getMessage());
}
return null;
}
public static int getHttpStatus() {
int status = 0;
HttpGet httpRequest = new HttpGet(
"http://192.168.0.214/vote/AndroidConnServlet");
try {
HttpParams httpParameters = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParameters, 5000);
HttpConnectionParams.setSoTimeout(httpParameters, 5000);
HttpConnectionParams.setTcpNoDelay(httpParameters, true);
HttpClient httpclient = new DefaultHttpClient(httpParameters);
HttpResponse httpResponse = httpclient.execute(httpRequest);
status = httpResponse.getStatusLine().getStatusCode();
} catch (Exception e) {
e.printStackTrace();
System.out
.println("==============connection wifi fail,e.printStackTrace() : "
+ e.getMessage());
}
return status;
}
}
//调用方法
public void ensureVote() {
String URL = "http://192.168.0.214/vote/VoteServlet";
codeText = codeEdit.getText().toString();
if (codeText == null || codeText.length() == 0) {
Toast.makeText(VoteActivity.this, "投票失败,请输入投票码.",
Toast.LENGTH_LONG).show();
return;
}
URL = URL + "?project=" + radioVoteText + "&voteCode=" + codeText
+ "&source=Android";
String httpStatus = "0";
httpStatus = HttpUtil.getHttpJSON(URL);
if (httpStatus != null && httpStatus.equals("1")) {
new AlertDialog.Builder(VoteActivity.this).setTitle("success")
.setMessage("投票成功,非常感谢.").setNeutralButton("返回",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dlg,
int sumthin) {
}
}).show();
} else if (httpStatus != null && httpStatus.equals("2")) {
new AlertDialog.Builder(VoteActivity.this).setTitle("warn")
.setMessage("投票失败,投票码已经使用.").setNeutralButton("返回",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dlg,
int sumthin) {
}
}).show();
} else if (httpStatus != null && httpStatus.equals("0")) {
new AlertDialog.Builder(VoteActivity.this).setTitle("error")
.setMessage("投票失败,请联系网管.").setNeutralButton("返回",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dlg,
int sumthin) {
}
}).show();
}
}
}