27.httpClien提交数据

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使用HttpClient发送请求、接收响应很简单，一般需要如下几步即可。
1. 创建HttpClient对象。
2. 创建请求方法的实例，并指定请求URL。如果需要发送GET请求，创建HttpGet对象；如果需要发送POST请求，创建HttpPost对象。
3. 如果需要发送请求参数，可调用HttpGet、HttpPost共同的setParams(HetpParams params)方法来添加请求参数；对于HttpPost对象而言，也可调用setEntity(HttpEntity entity)方法来设置请求参数。
4. 调用HttpClient对象的execute(HttpUriRequest request)发送请求，该方法返回一个HttpResponse。
5. 调用HttpResponse的getAllHeaders()、getHeaders(String name)等方法可获取服务器的响应头；调用HttpResponse的getEntity()方法可获取HttpEntity对象，该对象包装了服务器的响应内容。程序可通过该对象获取服务器的响应内容。
6. 释放连接。无论执行方法是否成功，都必须释放连接

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <EditText        android:id="@+id/et_name"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:hint="请输入用户名" />    <EditText        android:id="@+id/et_pass"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:hint="请输入密码" />    <Button         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="get"        android:text="get方式提交"        />    <Button         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="post"        android:text="post方式提交"        /></RelativeLayout>MainActivity.javaimport java.io.IOException;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.net.URLEncoder;import java.util.ArrayList;import java.util.List;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.StatusLine;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.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity {Handler handler = new Handler(){public void handleMessage(android.os.Message msg){Toast.makeText(MainActivity.this, (String) msg.obj, Toast.LENGTH_SHORT).show();}};    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void get(View v){        EditText et_name = (EditText) findViewById(R.id.et_name);    EditText et_pass = (EditText) findViewById(R.id.et_pass);        final String name = et_name.getText().toString();    final String pass = et_pass.getText().toString();        Thread t = new Thread(){        @Override    public void run(){    final String path = "http://192.168.0.102/web2/servlet/LoginServlet?name=" + URLEncoder.encode(name) + "&pass=" + pass;        //使用httpClient框架实现get提交        //1.获取httpClient对象        HttpClient hc = new DefaultHttpClient();                //2.创建httpGet对象,参数是网址        HttpGet hg = new HttpGet(path);                //3.使用客户端对象，把get请求发送出去        try {    HttpResponse hr = hc.execute(hg);    //拿到状态行    StatusLine sl = hr.getStatusLine();    if(sl.getStatusCode() == 200){    HttpEntity he = hr.getEntity();    //拿到实体中的内容，是服务器返回的输入流    InputStream is = he.getContent();    String text = Utils.getTextFromStream(is);        //刷新主线程显示text    Message msg = handler.obtainMessage();    msg.obj = text;        handler.sendMessage(msg);    }    } catch (ClientProtocolException e) {    // TODO Auto-generated catch block    e.printStackTrace();    } catch (IOException e) {    // TODO Auto-generated catch block    e.printStackTrace();    }    }    };    t.start();        }        public void post(View v){    EditText et_name = (EditText) findViewById(R.id.et_name);    EditText et_pass = (EditText) findViewById(R.id.et_pass);        final String name = et_name.getText().toString();    final String pass = et_pass.getText().toString();            Thread t = new Thread(){        @Override    public void run(){    final String path = "http://192.168.0.102/web2/servlet/LoginServlet";        //创建客户端对象        HttpClient hc = new DefaultHttpClient();        //创建post请求对象        HttpPost hp = new HttpPost(path);                //封装form表单提交的数据        BasicNameValuePair bnvp1 = new BasicNameValuePair("name", name);        BasicNameValuePair bnvp2 = new BasicNameValuePair("pass", pass);        //BasicNameValuePair放入集合中        List<BasicNameValuePair> parameters = new ArrayList<BasicNameValuePair>();        parameters.add(bnvp1);        parameters.add(bnvp2);    try {    //把集合传给实体对象    UrlEncodedFormEntity entity = new UrlEncodedFormEntity(parameters, "utf-8");        //设置post请求对象的额事体，把提交的对象封装在post请求的输出流中        hp.setEntity(entity);        //3.使用客户端发送post请求    HttpResponse hr = hc.execute(hp);    if(hr.getStatusLine().getStatusCode() == 200){    InputStream is = hr.getEntity().getContent();    String text = Utils.getTextFromStream(is);        //刷新主线程显示text    Message msg = handler.obtainMessage();    msg.obj = text;        handler.sendMessage(msg);        }    } catch (Exception e) {    // TODO Auto-generated catch block    e.printStackTrace();    }    }    };    t.start();        }    }Utils.javaimport java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;public class Utils {public static String getTextFromStream(InputStream is){byte[] b = new byte[1024];int len = 0;//创建字节输出流，读取输入流的文本数据时，同时把数据写入到输出流ByteArrayOutputStream bos = new ByteArrayOutputStream();try {while((len = is.read(b)) != -1){bos.write(b, 0, len);}//把字节数组输出流里面的数据，转换成字节数组String text = new String(bos.toByteArray());return text;} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}}

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