HttpClient提交数据

用代码模拟浏览器的行为

* 轻量级的开源的框架

* Android在6.0 23 以后移除了httpclient ,所以开发中用的少了

* 编写步骤：

1. 打开浏览器

2. 输入网址

3. 敲回车

HttpClient中的类：

HttpClient ：想服务器提交数据或者接受服务器返回的数据
NameValuePair ：post方式提交数据的键值对
UrlEncodedFormEntity
：经过form表单编码的数据实体
HttpResponse ：Http响应的
响应头和响应体
StatusLine ：状态行
HttpEntity ：服务器返给客户端的数据实体

GET请求示例代码: 

import java.io.InputStream;

import java.net.URLEncoder;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.StatusLine;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.DefaultHttpClient;

import android.app.Activity;

import android.os.Bundle;

import android.text.TextUtils;

import android.view.View;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends Activity {

   private EditText   etPwd;

   private EditText   etQQ;

   private String     pwd;

   private String     qq;

   @Override

   protected void onCreate(Bundle savedInstanceState) {

      super.onCreate(savedInstanceState);

      setContentView(R.layout.activity_main);

      etPwd = (EditText) findViewById(R.id.et_pwd);

      etQQ = (EditText) findViewById(R.id.et_qq);

   }

   /**

    * 1. 在子线程中进行网络通讯 2. 获取服务器返回的信息 3. 用Handler去展示服务器返回的信息

    */

   public void login(View v) {

      pwd = etPwd.getText().toString().trim();

      qq = etQQ.getText().toString().trim();

      if (TextUtils.isEmpty(pwd) || TextUtils.isEmpty(qq)) {

         Toast.makeText(this, "亲，请输入QQ号码或者密码！ :) ", 0).show();

         return;

      }

   // 开启子线程

      new Thread() {

         public void run() {

            requestNetWork();

         };

      }.start();

   }

   /**

    * 网络通信

    */

   private void requestNetWork() {

      try {

         String path = "http://192.168.25.70:8080/web/LoginServlet?" + "qq="

                + URLEncoder.encode(qq) + "&pwd=" + URLEncoder.encode(pwd, "utf-8");

         // 1. 打开浏览器

         HttpClient client = new DefaultHttpClient();

         // 2. 输入网址

         HttpGet urlGet = new HttpGet(path);

         // 3. 敲回车

         HttpResponse response = client.execute(urlGet);

         //状态行

         StatusLine statusLine = response.getStatusLine();

         //状态码

         int code = statusLine.getStatusCode();

         if (code == 200) {

            // * 2xxx 请求成 3xxx重定向 4xxx资源错误 5xxx服务器错误

            // 获取服务器返回的二进制输入流

            //响应体

            HttpEntity entity = response.getEntity();

            InputStream is = entity.getContent();

            // 把流转成字符串

            String text = StringUtils.parseStream2String(is);

            showToast(text);

         } else {

            showToast(code + "");

         }

      } catch (Exception e) {

         e.printStackTrace();

         showToast("服务器忙！");

      }

   }

   /**

    * 在任意线程弹土司

    */

   public void showToast(final String text) {

      this.runOnUiThread(new Runnable() {

         @Override

         public void run() {

            Toast.makeText(MainActivity.this, text, 0).show();

         }

      });

   }

}

POST请求示例代码:

import java.io.InputStream;

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.StatusLine;

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 android.app.Activity;

import android.os.Bundle;

import android.text.TextUtils;

import android.view.View;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends Activity {

   private EditText   etPwd;

   private EditText   etQQ;

   private String     pwd;

   private String     qq;

   @Override

   protected void onCreate(Bundle savedInstanceState) {

      super.onCreate(savedInstanceState);

      setContentView(R.layout.activity_main);

      etPwd = (EditText) findViewById(R.id.et_pwd);

      etQQ = (EditText) findViewById(R.id.et_qq);

   }

   /**

    * 1. 在子线程中进行网络通讯

    *  2. 获取服务器返回的信息

    *  3. 用Handler去展示服务器返回的信息

    */

   public void login(View v) {

      pwd = etPwd.getText().toString().trim();

      qq = etQQ.getText().toString().trim();

      if (TextUtils.isEmpty(pwd) || TextUtils.isEmpty(qq)) {

         Toast.makeText(this, "亲，请输入QQ号码或者密码！ :) ", 0).show();

         return;

      }

      // 开启子线程

      new Thread() {

         public void run() {

            requestNetWork();

         };

      }.start();

   }

   /**

    * 网络通信

    */

   private void requestNetWork() {

      try {

         String path = "http://192.168.3.100:8080/web/LoginServlet";

         // 1. 打开浏览器

         HttpClient client = new DefaultHttpClient();

         // 2. 输入网址

         HttpPost urlPost = new HttpPost(path);

//       String data = "qq="+URLEncoder.encode(qq)+"&pwd="+URLEncoder.encode(pwd, "utf-8");

         //要提交的数据

         List<NameValuePair> parameters = new ArrayList<NameValuePair>();

         parameters.add(new BasicNameValuePair("qq", qq));

         parameters.add(new BasicNameValuePair("pwd", pwd));

         //经过Url表单编码

         UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(parameters,"utf-8");

         //设置要提交的数据

         urlPost.setEntity(urlEncodedFormEntity);

         // 3. 敲回车

         HttpResponse response = client.execute(urlPost);

         //状态行

         StatusLine statusLine = response.getStatusLine();

         //状态码

         int code = statusLine.getStatusCode();

         if (code == 200) {

            // * 2xxx 请求成 3xxx重定向 4xxx资源错误 5xxx服务器错误

            // 获取服务器返回的二进制输入流

            //响应体

            HttpEntity entity = response.getEntity();

            InputStream is = entity.getContent();

            // 把流转成字符串

            String text = StringUtils.parseStream2String(is);

            showToast(text);

         } else {

            showToast(code + "");

         }

      } catch (Exception e) {

         e.printStackTrace();

         showToast("服务器忙！");

      }

   }

   /**

    * 在任意线程弹土司

    */

   public void showToast(final String text) {

      this.runOnUiThread(new Runnable() {

         @Override

         public void run() {

           Toast.makeText(MainActivity.this, text, 0).show();

         }

      });

   }

}

import java.io.ByteArrayOutputStream;

import java.io.InputStream;

/**

 * 操作字符串

 */

public class StringUtils {

   /**

    * 从流中转成字符串

    * @param is

    *            输入流

    * @return null表示失败

    */

   public static String parseStream2Str(InputStream is) {

      //内存输出流

      ByteArrayOutputStream baos = new ByteArrayOutputStream();

      int len = -1;

      byte[] buffer = new byte[1024*8];

      try {

         while((len = is.read(buffer)) != -1){

            baos.write(buffer, 0, len);

         }

         return new String(baos.toByteArray());

      } catch (Exception e) {

         e.printStackTrace();

         return null;

      }

   }

}

巴特西

HttpClient提交数据

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