android与web交互-post请求

package org.lxh.demo;    import java.util.ArrayList;import java.util.List;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;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.protocol.HTTP;import org.apache.http.util.EntityUtils;import android.app.Activity;import android.os.Bundle;import android.widget.TextView;public class MyWebDemo extends Activity {    private TextView info = null;    private static final String URL = "http://114.249.165.249/mldn/android.jsp"; // 请求地址    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        super.setContentView(R.layout.main);        this.info = (TextView) super.findViewById(R.id.info);        boolean flag = false; // 成功与否的标记        try {            HttpPost request = new HttpPost(URL);            List<NameValuePair> params = new ArrayList<NameValuePair>();            params.add(new BasicNameValuePair("id", "lixinghua"));            params.add(new BasicNameValuePair("password", "mldn"));            request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));            HttpResponse response = new DefaultHttpClient().execute(request);            if(response.getStatusLine().getStatusCode() != 404) {   // 现在已经发现了数据了                flag = Boolean.parseBoolean(EntityUtils.toString(                        response.getEntity()).trim());            }        } catch (Exception e) {            info.setText("WEB服务器连接失败！");        }        if (flag) {            info.setText("用户登录成功！");        } else {            info.setText("用户登录失败！");        }    }}
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