android 与服务器交互

服务器端代码：

testServlet.java

package com.liuxiang;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class testServlet extends HttpServlet
{
	private static final long serialVersionUID = 1L;

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException
	{
		doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException
	{
		response.setContentType("text/html;charset=utf-8");
		response.setCharacterEncoding("UTF-8");
		String name=request.getParameter("name");
		String pwd=request.getParameter("pwd");
		String message = ":Welcome to android!";
		
		if (name.equals("admin")&&pwd.equals("liuxiang"))
			response.getWriter().write(name+message);
		else
			response.getWriter().write("Input Error!");
	}

}

Android 客户端代码：

HttpAndroidActivity.java

package liuxiang.com.http;

import java.net.URI;
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.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.app.AlertDialog;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class HttpAndroidActivity extends Activity
{
	EditText e1, e2;
	Button b_get, b_post;

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		e1 = (EditText) findViewById(R.id.editText1);
		e2 = (EditText) findViewById(R.id.editText2);
		b_get = (Button) findViewById(R.id.buttonget);

		b_get.setOnClickListener(new OnClickListener()  // GET 请求
		{
			@Override
			public void onClick(View v)
			{
				String url = "http://10.0.2.2:8080/aboutAndroid/servlet/testServlet";
				url = url+"?name="+e1.getText().toString()+"&pwd="+e2.getText().toString();
				HttpClient client = new DefaultHttpClient();
				try
				{
					HttpPost httpPost = new HttpPost(new URI(url));
					HttpResponse httpResponse = client.execute(httpPost);
					HttpEntity httpEntity = httpResponse.getEntity();
					String out = EntityUtils.toString(httpEntity);
					new AlertDialog.Builder(HttpAndroidActivity.this).setMessage(out).create().show();

				} catch (Exception e)
				{
					// TODO Auto-generated catch block
					e.printStackTrace();
				}

			}
		});

		b_post = (Button) findViewById(R.id.buttonpost);
		b_post.setOnClickListener(new OnClickListener()  // POST 请求
		{

			@Override
			public void onClick(View arg0)
			{
				String url = "http://10.0.2.2:8080/aboutAndroid/servlet/testServlet";
				String name = e1.getText().toString();
				String pwd = e2.getText().toString();
				NameValuePair nameValuePair1 = new BasicNameValuePair("name", name);
				NameValuePair nameValuePair2 = new BasicNameValuePair("pwd", pwd);
				List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
				nameValuePairs.add(nameValuePair1);
				nameValuePairs.add(nameValuePair2);
				try
				{
					HttpEntity requestHttpEntity = new UrlEncodedFormEntity(nameValuePairs);
					HttpPost httpPost = new HttpPost(url);
					httpPost.setEntity(requestHttpEntity);
					HttpClient httpClient = new DefaultHttpClient();
					HttpResponse httpResponse = httpClient.execute(httpPost);
					HttpEntity httpEntity = httpResponse.getEntity();
					String out = EntityUtils.toString(httpEntity);
					new AlertDialog.Builder(HttpAndroidActivity.this).setMessage(out).create().show();

				} catch (Exception e)
				{
					// TODO Auto-generated catch block
					e.printStackTrace();
				}

			}
		});

	}
}

mail.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="输入进入服务器的用户名和密码：" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/buttonget"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Get进入" />
    <Button
        android:id="@+id/buttonpost"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Post进入" />

</LinearLayout>

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