安卓向伺服器傳送資料和伺服器接收資料全過程
阿新 • • 發佈：2019-01-03
注意：如果開啟輸出流了 客戶端的請求方法是GET，就會請求到伺服器的POST方法去
安卓端：
package com.example.k.servletdemo; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.TextView; import java.io.BufferedReader; import java.io.DataOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.UnsupportedEncodingException; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.net.URLDecoder; import java.net.URLEncoder; public class MainActivity extends Activity { private final int GETVALUE = 0,POSTVALUE = 1; Button sendGET, sendPOST; TextView t, sendPOSTtextView; String str = "樑嘉亮"; String str1; Handler handler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case GETVALUE: try { msg.obj = URLDecoder.decode(msg.obj + "", "UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } t.setText("" + msg.obj); break; case POSTVALUE: sendPOSTtextView.setText("" + msg.obj); break; default: break; } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.layout); t = (TextView) findViewById(R.id.textView); sendPOSTtextView = (TextView) findViewById(R.id.textView2); sendPOST = (Button) findViewById(R.id.button1); sendGET = (Button) findViewById(R.id.button); sendGET.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { new Thread(new Runnable() { @Override public void run() { HttpURLConnection connection; try { //用GET方法向伺服器傳送資料，在連結裡面傳值 str1 = URLEncoder.encode(str, "UTF-8"); URL url = new URL("http://120.27.103.151:8088/JWebDemoByIDE/MyServlet?name=" + str1 + "&age=23"); connection = (HttpURLConnection) url.openConnection(); connection.setReadTimeout(5000); connection.setRequestMethod("GET"); connection.setRequestProperty("charset", "UTF-8"); connection.setConnectTimeout(5000); connection.setDoInput(true); if (connection.getResponseCode() == 200) { InputStream in = connection.getInputStream(); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); StringBuilder s = new StringBuilder(); String line; while ((line = reader.readLine()) != null) { s.append(line); } reader.close(); Message message = new Message(); message.what = GETVALUE; message.obj = s.toString(); handler.sendMessage(message); } } catch (Exception e) { Log.i("ok", "有錯誤！"); } } }).start(); } }); sendPOST.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { new Thread(new Runnable() { @Override public void run() { try { URL url = new URL("http://120.27.103.151:8088/JWebDemoByIDE/MyServlet"); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setRequestMethod("POST"); connection.setConnectTimeout(5000); connection.setReadTimeout(5000); connection.setRequestProperty("charset", "UTF-8"); connection.setDoOutput(true); DataOutputStream out = new DataOutputStream(connection.getOutputStream()); //向伺服器傳送資料 out.writeBytes("Im Liang Jia Liang!"); if (connection.getResponseCode() == 200) { InputStream in = connection.getInputStream(); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); StringBuilder s = new StringBuilder(); String line; //讀取伺服器返回的資料 while ((line = reader.readLine()) != null) { s.append(line); } Message message = new Message(); message.what = POSTVALUE; message.obj = s.toString(); handler.sendMessage(message); reader.close(); } out.close(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }).start(); } }); } }
記得要宣告一下網路許可權：
佈局檔案：<?xml version="1.0" encoding="UTF-8"?> <manifest package="com.example.k.servletdemo" xmlns:android="http://schemas.android.com/apk/res/android"> <uses-permission android:name="android.permission.INTERNET"/> <application android:theme="@style/AppTheme" android:supportsRtl="true" android:label="@string/app_name" android:icon="@mipmap/ic_launcher" android:allowBackup="true"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN"/> <category android:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> </application> </manifest>
<?xml version="1.0" encoding="UTF-8"?> <LinearLayout android:layout_height="match_parent" android:layout_width="match_parent" android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android"> <Button android:layout_height="wrap_content" android:layout_width="match_parent" android:text="sendGET" android:id="@+id/button"/> <TextView android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/textView"/> <Button android:layout_height="wrap_content" android:layout_width="match_parent" android:text="sendPOST" android:id="@+id/button1"/> <TextView android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/textView2"/> </LinearLayout>
以下是伺服器端：（伺服器用的是tomcat，虛擬主機是阿里雲的ECS）
package com.iotek.jee.servlet;
import java.io.BufferedReader;
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 MyServlet extends HttpServlet {
private static final long serialVersionUID = -9122125709896866661L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//獲取http://120.27.103.151:8088/JWebDemoByIDE/MyServlet?name=liangjialiang 問號後面的值
String name = req.getParameter("name");
String age = req.getParameter("age");
resp.getWriter().write(name);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
BufferedReader b = req.getReader();
String line;
StringBuilder s = new StringBuilder();
while((line = b.readLine())!=null){
s.append(line);
}
resp.getWriter().write(s.toString());
}
@Override
protected void doDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
}
@Override
protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
}
}
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>JWebDemoByIDE</display-name>
<servlet>
<servlet-name>MyServlet</servlet-name>
<servlet-class>com.iotek.jee.servlet.MyServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MyServlet</servlet-name>
<url-pattern>/MyServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
執行效果圖如下：
