java web和Android第一次互動（登入）
一.開發環境
Android程式碼用eclipse開發 javaweb用Ide開發
二.Android程式碼
新建Android專案
package com.example.testlogin;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLDecoder;
import java.net.URLEncoder;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
public static String Home="http://192.168.1.45:8080/Test/login";//換成自己的地址
private static TextView tv;
private TextView top2;
public static Handler mHandler=new Handler(){
public void handleMessage(android.os.Message msg) {
tv.setText((String)msg.obj);
};
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText user=(EditText)findViewById(R.id.edittext);
final EditText pass=(EditText)findViewById(R.id.edittext2);
tv=(TextView)findViewById(R.id.top);
top2=(TextView)findViewById(R.id.top2);
top2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
loginByPost(user.getText().toString(),pass.getText().toString()); //測試帳號123 密碼123
}
}).start();
}
});
}
public static String loginByPost(String username,String password){
try {
URL url = new URL(Home);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("POST");
String data = "username="+URLEncoder.encode(username)+"&password="
+URLEncoder.encode(password);
System.out.println(data);
conn.setRequestProperty("Content=Type", "application/x-wwww-form-urlencoded");
conn.setRequestProperty("Content-length", data.length()+"");
conn.setRequestProperty("Accept-Charset", "utf-8");
conn.setRequestProperty("contentType", "utf-8");
conn.setDoOutput(true);
OutputStream os = conn.getOutputStream();
os.write(data.getBytes());
int code = conn.getResponseCode();
System.out.println(code);
if (code == 200) {
InputStream is = conn.getInputStream();
String text =URLDecoder.decode( ReadInputStream(is), "UTF-8");
Message msg=new Message();
msg.obj=text;
mHandler.sendMessage(msg);
return text;
}else {
return null;
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println("111111");
} catch (ProtocolException e) {
System.out.println("222222");
e.printStackTrace();
} catch (IOException e) {
System.out.println("33333");
e.printStackTrace();
}
return null;
}
//讀取輸入流
public static String ReadInputStream(InputStream is) {
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int len = 0;
byte[] buffer = new byte[1024];
while ((len = is.read(buffer)) != -1) {
baos.write(buffer, 0, len);
}
is.close();
baos.close();
byte[] result = baos.toByteArray();
return new String(result);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
return "將輸入流轉化為字串失敗";
}
}
}
佈局檔案
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/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"
android:background="@android:color/white"
tools:context="com.example.testlogin.MainActivity" >
<TextView
android:id="@+id/top"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<EditText
android:layout_below="@id/top"
android:layout_width="100dp"
android:layout_height="50dp"
android:id="@+id/edittext"/>
<EditText
android:layout_width="100dp"
android:layout_height="50dp"
android:layout_below="@id/edittext"
android:id="@+id/edittext2"/>
<TextView
android:id="@+id/top2"
android:layout_below="@id/edittext2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
</RelativeLayout>
主配置檔案 新增聯網許可權
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
三.服務端 配置tomcat
1. 新建web專案，在web下新建libs包 匯入servlet-api.jar
2.配置web.xml
<servlet> <servlet-name>login</servlet-name> <servlet-class>com.marven.web.Login</servlet-class> </servlet> <servlet-mapping> <servlet-name>login</servlet-name> <url-pattern>/login</url-pattern> </servlet-mapping>3.Login程式碼
package com.marven.web; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.swing.*; import java.awt.*; import java.io.IOException; /** * Created by Marven on 2016/8/2. */ public class Login extends HttpServlet{ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); String username = request.getParameter("username"); String password = request.getParameter("password"); if ("123".equals(username)&&"123".equals(password)) { System.out.println("登入成功"); response.getOutputStream().write("登入成功".getBytes("utf-8")); System.out.println("返回的資料：" + "登入成功".getBytes("utf-8")); }else { System.out.println("登入失敗"); response.getOutputStream().write("登入失敗".getBytes("utf-8")); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setCharacterEncoding("UTF-8"); response.setHeader("content-type", "text/html;charset=UTF-8"); doGet(request, response); } }完畢 。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。