【Android系统之Web交换Demo】
一、系统介绍
Android系统发送请求到Web系统，Web系统可以是PHP语言、Python语言、java语言、ASP语言开发的，但是必须满足异构JVM的交换协议，可以是WebService请求、HTTP请求(普通表单请求和Restful格式的json请求)、Socket等请求。
二、系统源码
本例子以Android模拟登录发送数据到Web系统，Web系统采用JAVA语言中的Servlet
Android代码如下：
1)编写xml界面文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/username"/>
<EditText
android:id="@+id/userName"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/password"/>
<EditText
android:id="@+id/passwd"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/ok"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/ok"/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/cacel"/>
</LinearLayout>
2）编写JAVA注册事件
package cn.com.gaojs.demo;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import cn.com.gaojs.service.impl.NetWorkTools;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class LoginActivity extends Activity {
public static final String url ="http://192.168.1.100:8080/AndroidWeb/servlet/PDAServlet";
private Button btn;
private EditText userName;
private EditText passwd;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
userName = (EditText) this.findViewById(R.id.userName);
passwd = (EditText) this.findViewById(R.id.passwd);
btn = (Button) this.findViewById(R.id.ok);
btn.setOnClickListener(new LoginOnClickListener());
}
private class LoginOnClickListener implements OnClickListener{
@Override
public void onClick(View v) {
String userName1 = userName.getText().toString();
String passwd1 = passwd.getText().toString();
Toast.makeText(LoginActivity.this, "Hello"+userName1+passwd1, 10).show();
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("userName",userName1));
params.add(new BasicNameValuePair("passwd",passwd1));
params.add(new BasicNameValuePair("method","login"));
System.out.println("------begin call---NetWorkTools---");
NetWorkTools.test(params);
System.out.println("------end call---NetWorkTools---");
}
}
}
3) 封装http请求
package cn.com.gaojs.service.impl;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
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 cn.com.gaojs.demo.LoginActivity;
public class NetWorkTools {
public static void test(List<NameValuePair> params){
try {
System.out.println(params);
HttpPost post = new HttpPost(LoginActivity.url);
//params.add(new BasicNameValuePair("",""));
post.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));
HttpResponse response = new DefaultHttpClient().execute(post);
String content = EntityUtils.toString(response.getEntity()).trim();
System.out.println(content);
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
Web端代码如下：
1)声明servlet
package cn.com.android.servlet;
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 PDAServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String method = request.getParameter("method");
String userName = request.getParameter("userName");
String passwd = request.getParameter("passwd");
System.out.println(method +",username="+userName+",passwd="+passwd);
//此处代码是处理登录逻辑的
if("login".equalsIgnoreCase(method)){
//doLogin(request, response);
}else if ("XXXX".equalsIgnoreCase(method)){
//doXXXX(request, response);
}else if ("YYY".equalsIgnoreCase(method)){
//doYYY(request, response);
}
}
}
2）Web.xml配置请求路径
<servlet>
<servlet-name>PDAServlet</servlet-name>
<servlet-class>cn.com.android.servlet.PDAServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>PDAServlet</servlet-name>
<url-pattern>/servlet/PDAServlet</url-pattern>
</servlet-mapping>
3）启动，验证
三、验证
