Android之HttpClient的GET和POST区别

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我们通过AsyncTask这个异步类来执行和界面的交互，然后将返回的数据给UI主线程。

你可以把HttpClient想象成一个浏览器，通过它的API我们可以很方便的发出GET，POST请求。

userName = (EditText) findViewById(R.id.editText1);passWord = (EditText) findViewById(R.id.editText2);

Get传值方式：

MyAsyncTaskGet task = new MyAsyncTaskGet(result);String user = userName.getText().toString();String pass = passWord.getText().toString();task.execute("http://192.168.0.17:8080/HttpDemo/login.jsp?username="+user+"&password="+pass);

Android虚拟机ip使用10.0.2.2 实体机需要使用真实ip

Get处理方式：

import java.io.IOException;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils;import android.os.AsyncTask;import android.widget.TextView;public class MyAsyncTaskGet extends AsyncTask<String, Void, String> {private TextView textView;public MyAsyncTaskGet(TextView textView){this.textView = textView;}protected String doInBackground(String... params) {String httpUrl = params[0];//打开一个浏览器HttpClient client = new DefaultHttpClient();//输入网址HttpGet get = new HttpGet(httpUrl);//回车try {HttpResponse response = client.execute(get);//服务器响应状态int code = response.getStatusLine().getStatusCode();if(code == 200){//返回数据HttpEntity entity = response.getEntity();String result = EntityUtils.toString(entity);                               //EntityUtils是一个工具类，通过它可以将数据转换成想要的格式                                return result;}} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return null;}protected void onPostExecute(String result) {super.onPostExecute(result);textView.setText(result);}}

POST传值方式：

MyAsyncTaskPost taskPost = new MyAsyncTaskPost(result);taskPost.execute("http://192.168.0.17:8080/HttpDemo/login.jsp",userName.getText().toString(),passWord.getText().toString());

POST处理方式：

由于POST方式不能在url上直接传递参数，故通过HttpPost的setEntity方法设置键值对来作为参数。

import java.io.IOException;import java.io.UnsupportedEncodingException;import java.util.ArrayList;import java.util.List;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.ClientProtocolException;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 org.apache.http.util.EntityUtils;import android.os.AsyncTask;import android.widget.TextView;public class MyAsyncTaskPost extends AsyncTask<String, Void, String> {private TextView textView;public MyAsyncTaskPost(TextView textView){this.textView = textView;}protected String doInBackground(String... params) {String httpUrl = params[0];String username = params[1];String password = params[2];HttpClient client = new DefaultHttpClient();HttpPost post = new HttpPost(httpUrl);//UrlEncodedFormEntity里面的参数是一个List<NameValuePair>集合List<NameValuePair> list = new ArrayList<NameValuePair>();list.add(new BasicNameValuePair("username", username));list.add(new BasicNameValuePair("password", password));try {//setEntity里的参数是一个HttpEntity实体，这是一个接口，不能new出对象，所以用了一个继承它的类post.setEntity(new UrlEncodedFormEntity(list));HttpResponse response = client.execute(post);int code = response.getStatusLine().getStatusCode();if(code == 200){HttpEntity entity = response.getEntity();//通过EntityUtils工具类将返回的数据转换String result = EntityUtils.toString(entity);return result;}} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return null;}protected void onPostExecute(String result) {super.onPostExecute(result);textView.setText(result);}}

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