HttpClient为Android开发人员提供了跟简洁的操作Http网络连接的方法，在连接过程中也有两种方式，get和post，先看一下怎样实现的
默认是get方式
//先将參数放入List，再对參数进行URL编码
List<BasicNameValuePair> params = new LinkedList<BasicNameValuePair>();
params.add(new BasicNameValuePair("param1", "中国"));
params.add(new BasicNameValuePair("param2", "value2"));
//baseUrl
String baseUrl = "http://www.baidu.com"; //将URL与參数拼接
HttpGet getMethod = new HttpGet(baseUrl + "?" + param); HttpClient httpClient = new DefaultHttpClient(); try {
HttpResponse response = httpClient.execute(getMethod); //发起GET请求 Log.i(TAG, "resCode = " + response.getStatusLine().getStatusCode()); //获取响应码
Log.i(TAG, "result = " + EntityUtils.toString(response.getEntity(), "utf-8"));//获取server响应内容
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
post方式
//和GET方式一样，先将參数放入List
params = new LinkedList<BasicNameValuePair>();
params.add(new BasicNameValuePair("param1", "Post方法"));
params.add(new BasicNameValuePair("param2", "第二个參数")); try {
HttpPost postMethod = new HttpPost(baseUrl);
postMethod.setEntity(new UrlEncodedFormEntity(params, "utf-8")); //将參数填入POST Entity中 HttpResponse response = httpClient.execute(postMethod); //运行POST方法
Log.i(TAG, "resCode = " + response.getStatusLine().getStatusCode()); //获取响应码
Log.i(TAG, "result = " + EntityUtils.toString(response.getEntity(), "utf-8")); //获取响应内容 } catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
假设须要在获得网络资源后，去更新UI的一些东西，须要使用异步的方式，否则会错误发生
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg.what == 0x123) {
tv.setText(result);
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.tv);
result = "";
final HttpClient httpclient = new DefaultHttpClient();
new Thread() {
public void run() {
HttpGet httpRequest = new HttpGet(
"http://www.baidu.com");
try {
HttpResponse httpResponse = httpclient.execute(httpRequest);
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
// 取得返回的字符串
result = EntityUtils.toString(httpResponse.getEntity());
//tv.setText(result);//假设在这里来使用会报错
Message msg = new Message();
msg.what = 0x123;
handler.sendMessage(msg);
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}.start();
}