安卓的网络编程（重点是自己写web接口）

作为一名安卓开发者可以自己给自己写接口，甚至会javaweb可以说是我一直以来渴望的，今天终于小有所成^–^
事先说明一下：
关注的小伙伴们注意一下，我上一篇写的是web访问数据库的元数据封装，今天用的就是上一次的那个javaweb小项目登录和注册，今天用到上次的内容，需要的小伙伴们可以下载我的项目^–^
点击下载：小javaweb项目

登录接口代码：

package com.zbv.servlet.jiekou;

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;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;
import com.zbv.dao.DBUserDao;
import com.zbv.dao.impl.DBUserDaoImpl;
import com.zbv.javabean.User;

public class AndroidLogin extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        DBUserDao dbDao=new DBUserDaoImpl();
        //同样的简单格式要求可以在客户端判断
        String username=request.getParameter("username");
        String password=request.getParameter("password");
        User user=dbDao.findUserByUsernameAndPassword(username, password);
        if(user!=null){
            //合法登陆成功
            JsonObject json=new JsonObject();
            json.add("ResultCode", new JsonPrimitive("200"));
            response.getWriter().write(json.toString());
        }else{
            //不合法
            JsonObject json=new JsonObject();
            json.add("ResultCode", new JsonPrimitive("300"));//用户名或者密码错误
            response.getWriter().write(json.toString());
        }
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }
}

注册接口代码：

package com.zbv.servlet.jiekou;

import java.io.IOException;
import java.io.PrintWriter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;
import com.zbv.dao.DBUserDao;
import com.zbv.dao.impl.DBUserDaoImpl;
import com.zbv.javabean.User;

public class AndroidRegister extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        DBUserDao dbDao=new DBUserDaoImpl();
        //服务端不作判断：会上传给我-用户名 密码 邮箱以及生日 。那么首先我必须判断此用户是否已注册，如果没有则添加到数据库并且返回结果给客户端
        String uname=request.getParameter("username");//依据字段username获取客户端post的信息
        User u=dbDao.findUserByUsername(uname);
        if(u==null){
            //说明该用户没有注册过，那么需要进行注册
            //创建对象并将数据封装进去
            User user=new User();
            user.setUsername(request.getParameter("username"));
            user.setPassword(request.getParameter("password"));
            user.setEmail(request.getParameter("email"));
            String birthday=request.getParameter("birthday");
            SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
            try {
                Date birth=sdf.parse(birthday);
                user.setBirthday(birth);
            } catch (ParseException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            //操作数据库，把数据添加到数据库，并且返回结果至客户端
            dbDao.addUser(user);
            JsonObject json=new JsonObject();
            json.add("ResultCode", new JsonPrimitive("200"));
            response.getWriter().write(json.toString());
        }else{
            //该用户已经存在了，不需要再注册了
            JsonObject json=new JsonObject();
            json.add("ResultCode", new JsonPrimitive("100"));
            //输出响应
            response.getWriter().write(json.toString());
        }
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }
}

注意啦，上面的两段代码也是放在javaweb项目中的，我把浏览器部分的servlet和安卓接口的servlet放在各自不同的包中。我的登录接口为：http:192.168.1.105:8080/LittleTest/Login;注册接口为：http:192.168.1.105:8080/LittleTest/Register;我把MyEclipse中默认的访问地址/Servlet/AndroidLogin/AndroidRegister改为Login和Register。可能这几句解释有些小伙伴不明白，但是不要紧，想要了解的可以深入了解一下web知识即可！

安卓布局—我尝试用TableLayout来布局也是无意中看到决定试试水，效果还挺不错的
登录布局：

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="300dp"
    android:layout_height="match_parent"
    android:gravity="center_vertical"
    android:layout_gravity="center_horizontal"
    android:stretchColumns="1"
    >

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/logo" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="welcom to login"
        android:textSize="25sp"
        android:gravity="center_horizontal" />
    <TableRow >
        <TextView 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="username:"
            />
        <EditText 
            android:id="@+id/username"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="text"
            />
    </TableRow>
     <TableRow >
        <TextView 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="password:"
            />
        <EditText 
            android:id="@+id/password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textPassword"
            />
    </TableRow>

     <LinearLayout 
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:orientation="horizontal"
          android:gravity="center_horizontal"
          android:layout_marginTop="10dp"
         >
         <Button 
             android:id="@+id/btn_login"
             android:layout_width="100dp"
             android:layout_height="wrap_content"
             android:text="Login"
             android:background="@drawable/btn_bg_selector"
             android:layout_marginRight="30dp"
             />
          <Button 
             android:id="@+id/btn_register"
             android:layout_width="100dp"
             android:layout_height="wrap_content"
             android:text="Register"
             android:background="@drawable/btn_bg_selector"
             />
     </LinearLayout>
</TableLayout>

注册布局：

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/bg"
    android:stretchColumns="1" >

    <TableRow>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="用户名:"
            android:textColor="@android:color/white"
            android:textSize="20sp" />

        <EditText
            android:id="@+id/uname"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textColor="@android:color/white"
            android:textSize="20sp" />
    </TableRow>

    <TableRow>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密    码:"
            android:textColor="@android:color/white"
            android:textSize="20sp" />

        <EditText
            android:id="@+id/r_pwd"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textPassword"
            android:textColor="@android:color/white"
            android:textSize="20sp" />
    </TableRow>

    <TableRow>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="邮    箱:"
            android:textColor="@android:color/white"
            android:textSize="20sp" />

        <EditText
            android:id="@+id/email"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textColor="@android:color/white"
            android:textSize="20sp" />
    </TableRow>

    <TableRow>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="生    日:"
            android:textColor="@android:color/white"
            android:textSize="20sp" />

        <EditText
            android:id="@+id/birthday"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textColor="@android:color/white"
            android:textSize="20sp" />
    </TableRow>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:gravity="center_horizontal"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/toRegister"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_marginRight="50dp"
            android:background="@drawable/btn_bg_selector"
            android:text="register" />

        <Button
            android:id="@+id/toBack"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:background="@drawable/btn_bg_selector"
            android:text="back" />
    </LinearLayout>
</TableLayout>

安卓代码如下：—再次温习一下HttpURLConnection以及HttpClient,因为现在网络连接类实在太丰富了，功能也十分强大例如Volley甚至xUtils，还用基础类基本很少了，今天算是温习一下，都快忘完了，顺带记录一下，以后好复习，万丈高楼也要平地起嘛！注意啦：代码中的MainActivity也就是一个跳转界面而已
Constant类：主要放一些常量例如url

package com.zbv.testforjavaweb;

public class Constant {
    public static String MAIN="http://192.168.1.105:8080/LittleTest/";
    public static String LOGIN="Login";
    public static String REGISTER="Register";
}

Login登录类—activity

package com.zbv.testforjavaweb;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class LoginActivity extends Activity implements OnClickListener {

    EditText u_name;
    EditText pwd;
    Button btn_login;
    Button btn_register;
    Handler mHandler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_login);
        u_name = (EditText) findViewById(R.id.username);
        pwd = (EditText) findViewById(R.id.password);
        btn_login = (Button) findViewById(R.id.btn_login);
        btn_register = (Button) findViewById(R.id.btn_register);
        btn_login.setOnClickListener(this);
        btn_register.setOnClickListener(this);
        mHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what) {
                case 0x100:
                    Toast.makeText(LoginActivity.this, "访问出错了",
                            Toast.LENGTH_SHORT).show();
                    break;
                case 0x200:
                    String text=(String) msg.obj;
                    //json解析
                    try {
                        JSONObject json=new JSONObject(text);
                        String result=json.getString("ResultCode");
                        Toast.makeText(LoginActivity.this, result, Toast.LENGTH_SHORT).show();
                        Intent intent=new Intent(LoginActivity.this, MainActivity.class);
                        startActivity(intent);
                    } catch (JSONException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    break;
                }
            }
        };
    }

    @Override
    public void onClick(View v) {
        int id = v.getId();
        switch (id) {
        case R.id.btn_login:
            /**
             * HttpURLConnection:Post
             * */
            new Thread(new Runnable() {

                @Override
                public void run() {
                    try {
                        URL url = new URL(Constant.MAIN + Constant.LOGIN);
                        HttpURLConnection huc = (HttpURLConnection) url
                                .openConnection();
                        huc.setDoInput(true);
                        huc.setDoOutput(true);
                        huc.setReadTimeout(5000);
                        huc.setConnectTimeout(5000);
                        huc.setRequestMethod("POST");
//                      huc.setRequestProperty("Content-Type", "appliction/x-www-form-urlencoded");
//                      huc.setRequestProperty("Content-Length", "")
                        OutputStream os = huc.getOutputStream();
                        String strs = "username=" + u_name.getText().toString()
                                + "&password=" + pwd.getText().toString();
                        os.write(strs.getBytes("utf-8"));
                        if (huc.getResponseCode() == 200) {
                            InputStream is = huc.getInputStream();
                            byte[] bytes = new byte[1024];
                            int len = 0;
                            ByteArrayOutputStream baos = new ByteArrayOutputStream();
                            while ((len = is.read(bytes)) != -1) {
                                baos.write(bytes, 0, len);
                            }
                            String result = new String(baos.toByteArray());
                            Message msg = mHandler.obtainMessage();
                            msg.what = 0x200;
                            msg.obj = result;
                            mHandler.sendMessage(msg);
                        } else {
                            // 出错了
                            mHandler.sendEmptyMessage(0x100);
                        }
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }).start();

            break;
        case R.id.btn_register:
            Intent intent = new Intent(this, RegisterActivity.class);
            startActivity(intent);
            break;
        }
    }
}

Register注册类—activity

package com.zbv.testforjavaweb;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
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 org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class RegisterActivity extends Activity implements OnClickListener{

    EditText[] edits;
    Button btn_register;
    Button btn_back;
    Handler mHandler;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_register);
        edits=new EditText[4];
        edits[0]=(EditText) findViewById(R.id.uname);//username
        edits[1]=(EditText) findViewById(R.id.r_pwd);//username
        edits[2]=(EditText) findViewById(R.id.email);//username
        edits[3]=(EditText) findViewById(R.id.birthday);//username
        btn_back=(Button) findViewById(R.id.toBack);
        btn_register=(Button) findViewById(R.id.toRegister);
        btn_back.setOnClickListener(this);
        btn_register.setOnClickListener(this);
        mHandler=new Handler(){
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what) {
                case 0x100:
                    Toast.makeText(RegisterActivity.this, "访问出错了", Toast.LENGTH_SHORT).show();
                    break;
                case 0x200:
                    String text=(String) msg.obj;
                    try {
                        JSONObject json=new JSONObject(text);
                        String result=json.getString("ResultCode");
                        Toast.makeText(RegisterActivity.this, result, Toast.LENGTH_SHORT).show();
                        Intent intent=new Intent(RegisterActivity.this, MainActivity.class);
                        startActivity(intent);
                    } catch (JSONException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    break;
                }
            }
        };
    }

    @Override
    public void onClick(View v) {
        int id=v.getId();
        switch (id) {
        case R.id.toRegister:

            new Thread(new Runnable() {

                @Override
                public void run() {
                    HttpClient client=new DefaultHttpClient();
                    HttpPost post=new HttpPost(Constant.MAIN+Constant.REGISTER);
                    //post.setParams(new BasicNameValuePair("username", value))
                    List<NameValuePair> list=new ArrayList<NameValuePair>();
                    list.add(new BasicNameValuePair("username", edits[0].getText().toString()));
                    list.add(new BasicNameValuePair("password", edits[1].getText().toString()));
                    list.add(new BasicNameValuePair("email", edits[2].getText().toString()));
                    list.add(new BasicNameValuePair("birthday", edits[3].getText().toString()));
                    try {

                        post.setEntity(new UrlEncodedFormEntity(list,HTTP.UTF_8));
                        HttpResponse response=client.execute(post);
                        Log.d("tag", "register......"+response.getStatusLine().getStatusCode());
                        if(response.getStatusLine().getStatusCode()==200){
                            String result=EntityUtils.toString(response.getEntity());
                            //InputStream is=response.getEntity().getContent();
                            Message msg=mHandler.obtainMessage();
                            msg.what=0x200;
                            msg.obj=result;
                            mHandler.sendMessage(msg);
                        }else{
                            mHandler.sendEmptyMessage(0x100);
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }).start();
            break;
        case R.id.toBack:
            Intent intent=new Intent(this, LoginActivity.class);
            startActivity(intent);
            break;
        }
    }
}

励志一番：分享是为了共同进步，小伙伴们愿我们继续加油^__^！
欢迎大神的指正和建议，谢谢啦！