android 38 Abdroid客户端和服务端交互
服务端：
package com.sxt.day05; import java.io.IOException; import java.util.ArrayList; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.codehaus.jackson.map.ObjectMapper; import com.sxt.day05.entity.User; @WebServlet("/Login") public class Login extends HttpServlet { private static final long serialVersionUID = 1L; ArrayList<User> users; public Login() { super(); User user=new User("张飞", "1234", "13377889966", "zf@qq.com"); users=new ArrayList<>(); users.add(user); user=new User("王菲", "1234", "13577889966", "wf@qq.com"); users.add(user); user=new User("刘亦菲", "1234", "133077889966", "lyf@qq.com"); users.add(user); user=new User("咖啡", "1234", "13877889966", "kf@qq.com"); users.add(user); } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String name=request.getParameter("name");//获取客户端发过来的名字 if(name==null){ return ; } name=new String(name.getBytes("iso8859-1"),"utf-8"); String pwd=request.getParameter("pwd"); for(int i=0;i<users.size();i++){ User user=users.get(i); if(name.equals(user.getName())&&pwd.equals(user.getPwd())){ ObjectMapper om=new ObjectMapper();//jackson-core-asl.jar om.writeValue(response.getOutputStream(), user);//将user对象以输出流发送给客户端 System.out.println(user.toString()); break; } } } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ArrayList<User> list=new ArrayList<>(); request.setCharacterEncoding("utf-8"); String name=request.getParameter("name"); for(int i=0;i<users.size();i++){ User user=users.get(i); if(user.getName().indexOf(name)>=0){//name在user的名字中 list.add(user); } } ObjectMapper om=new ObjectMapper(); om.writeValue(response.getOutputStream(), list); } }
客户端：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <EditText android:id="@+id/etName" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="输入姓名" android:text="菲"/> <EditText android:id="@+id/etPassword" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="输入登陆密码" android:text="123456" android:password="true"/> <Button android:id="@+id/btnLogin" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="GET方式登陆" /> <Button android:id="@+id/btnQuery" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="POST方式查询" /> </LinearLayout>
客户端Activity：
package com.sxt.day06_03; import java.io.IOException; import java.io.OutputStream; import java.io.UnsupportedEncodingException; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.net.URLEncoder; import java.util.List; import org.apache.http.client.utils.URLEncodedUtils; import org.codehaus.jackson.map.ObjectMapper; import com.sxt.day06.entity.User; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends Activity { private static final String PATH="http://10.0.2.2:8080/Day06_Servlet/Login_Servlet";//服务端地址 EditText metName,metPwd; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); setListener(); } private void setListener() { setLoginClickListener(); setQueryClickListener(); } private void setQueryClickListener() {//查询，POST方式 findViewById(R.id.btnQuery).setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { new Thread(){//访问网络要在工作线程搞 public void run() { String name=metName.getText().toString(); name="name="+name; try { byte[] data=name.getBytes("utf-8"); URL url=new URL(PATH); HttpURLConnection conn=(HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5000); conn.setReadTimeout(5000); conn.setRequestMethod("POST"); conn.setDoOutput(true);//像服务端发送数据 OutputStream out = conn.getOutputStream(); out.write(data); out.flush(); if(conn.getResponseCode()!=200){ return ; } ObjectMapper om=new ObjectMapper(); List<User> users=om.readValue(conn.getInputStream(), List.class); Log.i("main",users.toString()); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }; }.start(); } }); } private void setLoginClickListener() { findViewById(R.id.btnLogin).setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { new Thread(){//访问网络要在工作线程搞 public void run() { String name=metName.getText().toString(); String password=metPwd.getText().toString(); StringBuilder sb=new StringBuilder(PATH);//PATH地址 try { sb.append("?name=").append(URLEncoder.encode(name, "utf-8")) .append("&password=").append(password); URL url=new URL(sb.toString());// HttpURLConnection conn=(HttpURLConnection)url.openConnection(); conn.setReadTimeout(5000);//读取权限5秒，否则断开 conn.setConnectTimeout(5000);//连接时间5秒，否则断开 conn.setRequestMethod("GET");// if(conn.getResponseCode()!=200){ Toast.makeText(MainActivity.this, "连接服务端失败", 2000).show(); return ; } ObjectMapper om=new ObjectMapper(); User user = om.readValue(conn.getInputStream(), User.class); Log.i("main",user.toString()); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }; }.start(); } }); } private void initView() { metName=(EditText) findViewById(R.id.etName); metPwd=(EditText) findViewById(R.id.etPassword); } }
客户端项目描述文件：
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.sxt.day06_03" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="18" /> <uses-permission android:name="android.permission.INTERNET"/> 安卓想访问网络要申请网络权限 <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.sxt.day06_03.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
