Android Tomcat 的應用之用戶端部分

       最近因為做一個用戶端的登入部分，最後選擇了使用Tomcat作為servlet伺服器，MySQL作為資料庫，今天就先寫了一下用戶端的部分，主要就是Android的網路編程部分，伺服器端編程明天再寫吧，今天有點累了。

       首先是布局檔案，如下：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/hello" />    <TableLayout >        <TableRow >        <TextView             android:id="@+id/tv_name"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/nameStr"/>        <EditText             android:id="@+id/et_name"            android:layout_width="fill_parent"            android:layout_height="wrap_content"/>        </TableRow>        <TableRow >            <TextView                 android:id="@+id/tv_passwd"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="@string/passwdStr"/>            <EditText                 android:id="@+id/et_passwd"                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:password="true"/>        </TableRow>        <TableRow >            <Button                 android:id="@+id/btn_confirm"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="@string/btn_confirm"/>            <Button                 android:id="@+id/btn_cancel"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="@string/btn_cancel"/>        </TableRow>    </TableLayout>    </LinearLayout>

         然後就是進行網路編程部分了，肯定是要用到post方式，這個部分就做一個單獨的工具類，大家看一下就明白：

package com.chenlong12580.app.tomcat;import java.io.IOException;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils;public class HttpUtil {// 基礎URLpublic static final String BASE_URL="http://222.20.60.132:8080/WebRoot/";// 獲得Get請求對象requestpublic static HttpGet getHttpGet(String url){HttpGet request = new HttpGet(url); return request;}// 獲得Post請求對象requestpublic static HttpPost getHttpPost(String url){ HttpPost request = new HttpPost(url); return request;}// 根據請求獲得響應對象responsepublic static HttpResponse getHttpResponse(HttpGet request) throws ClientProtocolException, IOException{HttpResponse response = new DefaultHttpClient().execute(request);return response;}// 根據請求獲得響應對象responsepublic static HttpResponse getHttpResponse(HttpPost request) throws ClientProtocolException, IOException{HttpResponse response = new DefaultHttpClient().execute(request);return response;}// 發送Post請求，獲得響應查詢結果public static String queryStringForPost(String url){// 根據url獲得HttpPost對象HttpPost request = HttpUtil.getHttpPost(url);String result = null;try {// 獲得響應對象HttpResponse response = HttpUtil.getHttpResponse(request);// 判斷是否請求成功if(response.getStatusLine().getStatusCode()==200){// 獲得響應result = EntityUtils.toString(response.getEntity());return result;}} catch (ClientProtocolException e) {e.printStackTrace();result = "網路異常！";return result;} catch (IOException e) {e.printStackTrace();result = "網路異常！";return result;}        return null;    }// 獲得響應查詢結果public static String queryStringForPost(HttpPost request){String result = null;try {// 獲得響應對象HttpResponse response = HttpUtil.getHttpResponse(request);// 判斷是否請求成功if(response.getStatusLine().getStatusCode()==200){// 獲得響應result = EntityUtils.toString(response.getEntity());return result;}} catch (ClientProtocolException e) {e.printStackTrace();result = "網路異常！";return result;} catch (IOException e) {e.printStackTrace();result = "網路異常！";return result;}        return null;    }// 發送Get請求，獲得響應查詢結果public static  String queryStringForGet(String url){// 獲得HttpGet對象HttpGet request = HttpUtil.getHttpGet(url);String result = null;try {// 獲得響應對象HttpResponse response = HttpUtil.getHttpResponse(request);// 判斷是否請求成功if(response.getStatusLine().getStatusCode()==200){// 獲得響應result = EntityUtils.toString(response.getEntity());return result;}} catch (ClientProtocolException e) {e.printStackTrace();result = "網路異常！";return result;} catch (IOException e) {e.printStackTrace();result = "網路異常！";return result;}        return null;    }}

      最後就是在Activity裡面實現功能了，也就是設定按鈕的事件監聽器，如下：

package com.chenlong12580.app.tomcat;import android.app.Activity;import android.app.AlertDialog;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;public class TomcatActivity extends Activity {    /** Called when the activity is first created. */private EditText et_name, et_passwd;private Button btn_confirm, btn_cancel;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                et_name = (EditText)findViewById(R.id.et_name);        et_passwd = (EditText)findViewById(R.id.et_passwd);        btn_confirm = (Button)findViewById(R.id.btn_confirm);        btn_cancel = (Button)findViewById(R.id.btn_cancel);                btn_cancel.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubfinish();}});                btn_confirm.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubString queryStr = "username=" + et_name.getText().toString()+"&password=" + et_passwd.getText().toString();String urlStr = HttpUtil.BASE_URL+"servlet/tomcat?"+queryStr;String result = HttpUtil.queryStringForPost(urlStr);if(result != null) {showDialog("登入成功！");}else {showDialog("登入失敗！");}}});    }        private void showDialog(String str) {    AlertDialog.Builder builder = new AlertDialog.Builder(this);    builder.setMessage(str).setPositiveButton("確定", null);    AlertDialog dialog = builder.create();    dialog.show();    }}

       現在還不能測試，等明天寫好伺服器端再測試吧！