HttpClient接口Post方式

import java.util.ArrayList;import java.util.List;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.HttpStatus;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 org.apache.http.util.EntityUtils;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.widget.TextView;public class mainActivity extends Activity {    TextView tv;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        tv = (TextView) findViewById(R.id.tv1);        // HttpPost连接对象        HttpPost httpRequset = new HttpPost("http://10.0.2.2:8080/dem/");        // 使用NameValuePair来保存要传递的Post参数        List<NameValuePair> params = new ArrayList<NameValuePair>();        // 添加要传递的参数        params.add(new BasicNameValuePair("par", "asdf"));        try {            // 设置字符集            HttpEntity httpentity = new UrlEncodedFormEntity(params, "gb2312");            // 请求httpRequset            httpRequset.setEntity(httpentity);            // 取得HttpClient            HttpClient httpClient = new DefaultHttpClient();            // 取得HttpResponse            HttpResponse httpResponse = httpClient.execute(httpRequset);            if(httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {                String strResult = EntityUtils.toString(httpResponse                        .getEntity());                tv.setText(strResult);            }            else {                tv.setText("请求错误");            }        }        catch(Exception e) {            Log.e("", e.getMessage());        }    }}