android的互联网开发上-低调大师

android的互联网开发上

2017-11-12 552

一、java socket编程的介绍http://www.cnblogs.com/linzheng/archive/2011/01/23/1942328.html

二、URL、UrlConnection网络编程介绍

三、HTTP网络编程介绍

http协议-简介 http协议-C#获取网页源代码 http协议-多线程文件传输

四、 Web Service网络编程介绍

五、 android WebView网络编程介绍

实例代码-----------------------------------------------

服务器端模拟

MyServer.java

package com.amaker.socket;
import java.io.IOException;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
/**
*
* Socket 服务器，向客户端写Hello Android!
*/
public class MyServer {
public static void main(String[] args) {
try {
ServerSocket server = new ServerSocket(8888);
while(true){
Socket client = server.accept();
OutputStream out = client.getOutputStream();
String msg = "Hello Android!";
out.write(msg.getBytes());
client.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

LoginServlet.java

package com.amaker.http;
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;
/**
*
* 响应登录Servlet
*/
public class LoginServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
System.out.println(username+":"+password);
response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
String msg = null;
if(username!=null&&username.equals("admin")&&password!=null&&password.equals("1")){
msg = "登录成功!";
}else{
msg = "登录失败!";
}
out.print(msg);
out.flush();
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.amaker.http.LoginServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/servlet/LoginServlet</url-pattern>
</servlet-mapping>

</web-app>

android客户端

MainActivity.java

package com.amaker.ch13;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import com.amaker.ch13.http.LoginActivity;
import com.amaker.ch13.socket.TestSocketActivity;
import com.amaker.ch13.url.TestURLActivity;
import com.amaker.ch13.webservice.TestWebServiceActivity;
import com.amaker.ch13.webservice.WeatherActivity;
import com.amaker.ch13.webview.TestWebViewActivity;
public class MainActivity extends ListActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 菜单项数组
String[] items = {"测试 Socket","测试URL、UrlConnection","测试 HTTP","测试 Web Service","天气预报","Test WebView"};
// 将菜单项数组设置为ListView的列表项展示
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, items));
getListView().setTextFilterEnabled(true);
}
// 响应菜单项的单击事件
protected void onListItemClick(ListView l, View v, int position, long id) {
Intent intent = null;
switch (position) {
case 0:
intent = new Intent(MainActivity.this,TestSocketActivity.class);
startActivity(intent);
break;
case 1:
intent = new Intent(MainActivity.this,TestURLActivity.class);
startActivity(intent);
break;
case 2:
intent = new Intent(MainActivity.this,LoginActivity.class);
startActivity(intent);
break;
case 3:
intent = new Intent(MainActivity.this,TestWebServiceActivity.class);
startActivity(intent);
break;
case 4:
intent = new Intent(MainActivity.this,WeatherActivity.class);
startActivity(intent);
break;
case 5:
intent = new Intent(MainActivity.this,TestWebViewActivity.class);
startActivity(intent);
break;
}
}
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.amaker.ch13"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".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>
<activity android:name="com.amaker.ch13.http.LoginActivity"/>
<activity android:name="com.amaker.ch13.socket.TestSocketActivity"/>
<activity android:name="com.amaker.ch13.url.TestURLActivity"/>
<activity android:name="com.amaker.ch13.webservice.TestWebServiceActivity"/>
<activity android:name="com.amaker.ch13.webservice.WeatherActivity"/>
<activity android:name="com.amaker.ch13.webview.TestWebViewActivity"/>
</application>
<uses-sdk android:minSdkVersion="3" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
</manifest>

一、socket编程

TestSocketActivity.java

代码
package com.amaker.ch13.socket;
import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import com.amaker.ch13.R;
/**
*
* Android　Socket 客户端接收服务器信息
*/
public class TestSocketActivity extends Activity {
private TextView myTextView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.socket);
myTextView = (TextView)findViewById(R.id.msgTextView01);
try {
Socket socket = new Socket("192.168.1.101",8888);
InputStream in = socket.getInputStream();
byte[] buffer = new byte[in.available()];
in.read(buffer);
String msg = new String(buffer);
myTextView.setText(msg);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}

socket.xml

代码
<?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:text="等待接收服务器信息..."
android:id="@+id/msgTextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></TextView>
</LinearLayout>

二、URL、UrlConnection编程

TestURLActivity.java

代码
package com.amaker.ch13.url;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.widget.ImageView;
import com.amaker.ch13.R;
/**
* 通过URL进行网络连接
*/
public class TestURLActivity extends Activity {
private ImageView imageView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test_url);
imageView = (ImageView)findViewById(R.id.ImageView01);
String urlStr = "http://192.168.1.101:8080/Chapter_13_Networking_server/upload/zs.jpg";
try {
URL url = new URL(urlStr);
// 1. 直接使用URL获得输入流
//InputStream in = url.openStream();
// 2. 获得URLconnection
URLConnection conn = url.openConnection();
InputStream in = conn.getInputStream();
// 3. 如果是HTTP协议可以使用HttpURLConnection
//HttpURLConnection httpConn = (HttpsURLConnection)conn;
//in = httpConn.getInputStream();
Bitmap bm = BitmapFactory.decodeStream(in);
imageView.setImageBitmap(bm);
} catch (Exception e) {
e.printStackTrace();
}
}
}

test_url.xml

代码
<?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"
>
<ImageView
android:id="@+id/ImageView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></ImageView>
</LinearLayout>

三、 HTTP编程

LoginActivity.java

代码
package com.amaker.ch13.http;
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.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.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import com.amaker.ch13.R;
public class LoginActivity extends Activity {
/*
* 声明使用到的Button和EditText视图组件
*/
private Button cancelBtn,loginBtn;
private EditText userEditText,pwdEditText;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.http1);
/*
* 实例化视图组件
*/
cancelBtn = (Button)findViewById(R.id.cancelButton);
loginBtn = (Button)findViewById(R.id.loginButton);
userEditText = (EditText)findViewById(R.id.userEditText);
pwdEditText = (EditText)findViewById(R.id.pwdEditText);
/*
* 设置登录监听器
*/
loginBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String username = userEditText.getText().toString();
String pwd = pwdEditText.getText().toString();
login(username,pwd);
}
});
/*
* 设置取消监听器
*/
cancelBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
}
/*
* 定义一个显示提示信息的对话框
*/
private void showDialog(String msg){
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(msg)
.setCancelable(false)
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
AlertDialog alert = builder.create();
alert.show();
}
/*
* 通过用户名称和密码进行查询，发送Post请求，获得响应结果。
*/
private void login(String username,String password){
// 1. 使用 HttpURLConnection 实现
/*String urlStr = "http://192.168.1.101:8080/Chapter_13_Networking_server/servlet/LoginServlet?";
String queryString = "username="+username+"&password="+password;
urlStr+=queryString;
try {
URL url = new URL(urlStr);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
if(conn.getResponseCode()==HttpURLConnection.HTTP_OK){
InputStream in = conn.getInputStream();
byte[] b = new byte[in.available()];
in.read(b);
String msg = new String(b);
showDialog(msg);
in.close();
}
conn.disconnect();
} catch (Exception e) {
showDialog(e.getMessage());
}*/
// 2. 使用 Apache HTTP 客户端实现
String urlStr = "http://192.168.1.101:8080/Chapter_13_Networking_server/servlet/LoginServlet";
HttpPost request = new HttpPost(urlStr);
// 如果传递参数个数比较多的话，我们可以对传递的参数进行封装
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", username));
params.add(new BasicNameValuePair("password", password));
try {
request.setEntity( new UrlEncodedFormEntity(params,HTTP.UTF_8));
HttpResponse response = new DefaultHttpClient().execute(request);
if(response.getStatusLine().getStatusCode()==200){
String msg = EntityUtils.toString(response.getEntity());
showDialog(msg);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

本文转自linzheng 51CTO博客，原文链接:http://blog.51cto.com/linzheng/1079279

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原文链接：https://yq.aliyun.com/articles/467295

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