网上有不少例子来演示Android客户端和服务器端数据如何实现交互不过这些例子大多比较繁杂，对于初学者来讲这是不利的，如今介绍几种代码简单、逻辑清晰的交互例子，本篇博客介绍第一种：html
1、服务器端：java
代码1：添加名为“AndroidServerServlet.java”的文件
android
package com.ghj.packageofservlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class AndroidServerServlet extends HttpServlet {
private static final long serialVersionUID = 6792396567928634227L;
public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
response.setContentType("text/plain; charset=UTF-8");
request.setCharacterEncoding("UTF-8");
System.err.println(request.getParameter("clientData"));
PrintWriter printWriter = response.getWriter();
printWriter.print("您好Android客户端！");
printWriter.flush();
printWriter.close();
}
}
代码2：修更名为“web.xml”的文件web
xmlns:xsi="/2001/XMLSchema-instance"
xsi:schemaLocation="/xml/ns/javaee
/xml/ns/javaee/web-app_2_5.xsd">
AndroidServerServlet
com.ghj.packageofservlet.AndroidServerServlet
AndroidServerServlet
/AndroidServerServlet
2、Android手机客户端：
apache
代码1：添加名为“AndroidClientActivity.java”的文件
服务器
package com.example.androidclient;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
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.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.os.StrictMode;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class AndroidClientActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.android_client);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
Button sendButton = (Button) findViewById(R.id.send_button);
sendButton.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
HttpPost httpRequest = new HttpPost("http://172.16.99.207:8080/AndroidServer/AndroidServerServlet");
List params = new ArrayList();
params.add(new BasicNameValuePair("clientData", "您好服务器端！"));
try {
httpRequest.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));//设置请求参数项
HttpClient httpClient = new DefaultHttpClient();
HttpResponse httpResponse = httpClient.execute(httpRequest);//执行请求返回响应
if(httpResponse.getStatusLine().getStatusCode() == 200){//判断是否请求成功
Toast.makeText(AndroidClientActivity.this, EntityUtils.toString(httpResponse.getEntity()), Toast.LENGTH_LONG).show();
}else{
Toast.makeText(AndroidClientActivity.this, "没有获取到Android服务器端的响应！", Toast.LENGTH_LONG).show();
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
} 注意：请注意“AndroidClientActivity.java”文件中3四、3五、36和37这4行代码——若是没有这几行代码，则会出现workOnMainThreadException异常，关于该异常请参见另外一篇名为《
代码2：添加名为“android_client.xml”的文件
app
xmlns:tools="/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" >
android:id="@+id/send_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="@string/hello_server" />
