Android(安卓)使用HTTP（get和post）方式登陆服务器

package com.wuyou.submittoserver;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.text.TextUtils;import android.view.View;import android.widget.EditText;import android.widget.Toast;import java.io.BufferedReader;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLEncoder;public class MainActivity extends ActionBarActivity {    private static final int OK = 200;    private EditText usernameEditText;    private EditText passwrodEditText;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        usernameEditText = (EditText) findViewById(R.id.username);        passwrodEditText = (EditText) findViewById(R.id.password);    }    /**     * post方法多了三个东西：     * ①请求的表单类型     * ②请求的数据长度     * ③请求的数据并且写给服务器     */    public void post(View view) {        final String username = usernameEditText.getText().toString().trim();        final String password = passwrodEditText.getText().toString().trim();        //Android默认模拟器外部的地址为10.0.2.2，而不是localhost和127.0.0.1        final String serverPath = "http://10.0.2.2:8080/LoginServlet";        if (TextUtils.isEmpty(username) || TextUtils.isEmpty(password)) {            //给出提示：账号密码不许为空        } else {            new Thread(new Runnable() {                @Override                public void run() {                    try {                        //向服务器请求的数据                        String data = "username=" + URLEncoder.encode(username,"UTF-8") + "&password=" + URLEncoder.encode(password,"UTF-8");                        URL url = new URL(serverPath);                        HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();                        httpURLConnection.setRequestMethod("POST");                        httpURLConnection.setConnectTimeout(3000);                        httpURLConnection.setDoOutput(true);//打开输出流，以便向服务器提交数据                        //设置请求体的类型是文本类型                        httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");                        //设置请求体的长度                        httpURLConnection.setRequestProperty("Content-Length", String.valueOf(data.length()));                        //获得输出流，向服务器写入数据                        OutputStream outputStream = httpURLConnection.getOutputStream();                        outputStream.write(data.getBytes());                        int responseCode = httpURLConnection.getResponseCode();                        if (200 == responseCode) {                            InputStream inputStream = httpURLConnection.getInputStream();                            final String responseMsg = StreamTool.getString(inputStream);                            runOnUiThread(new Runnable() {                                @Override                                public void run() {                                    Toast.makeText(MainActivity.this, responseMsg, Toast.LENGTH_LONG).show();                                }                            });                        } else {                            System.out.println("responseCode = " + responseCode);                            //连接服务器出错，错误代码为：responseCode 根据代码值告诉用户出错的原因                            //....                        }                    } catch (Exception e) {                        e.printStackTrace();                    }                }            }).start();        }    }    public void get(View view) {        final String username = usernameEditText.getText().toString().trim();        final String password = passwrodEditText.getText().toString().trim();        //Android默认模拟器外部的地址为10.0.2.2，而不是localhost和127.0.0.1        final String serverPath = "http://10.0.2.2:8080/LoginServlet";        if (TextUtils.isEmpty(username) || TextUtils.isEmpty(password)) {            //给出提示：账号密码不许为空        } else {            new Thread(new Runnable() {                @Override                public void run() {                    try {                        //使用GET方式请求服务器只能这样                        URL url = new URL(serverPath + "?username=" + URLEncoder.encode(username,"UTF-8") + "&password=" + URLEncoder.encode(password,"UTF-8"));                        HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();                        httpURLConnection.setRequestMethod("GET");                        httpURLConnection.setConnectTimeout(5000);                        httpURLConnection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0");                        int responseCode = httpURLConnection.getResponseCode();                        if (200 == responseCode) {                            InputStream inputStream = httpURLConnection.getInputStream();                            final String responseMsg = StreamTool.getString(inputStream);                            runOnUiThread(new Runnable() {                                @Override                                public void run() {                                    Toast.makeText(MainActivity.this, responseMsg, Toast.LENGTH_LONG).show();                                }                            });                        } else {                            System.out.println("responseCode = " + responseCode);                            //连接服务器出错，错误代码为：responseCode 根据代码值告诉用户出错的原因                            //....                        }                    } catch (Exception e) {                        e.printStackTrace();                    }                }            }).start();        }    }}class StreamTool {    public static String getString(InputStream inputStream) throws IOException {        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();        byte[] buf = new byte[1024];        int length;        while((length = inputStream.read(buf)) >0) {            byteArrayOutputStream.write(buf, 0 ,length);        }        byte[] stringBytes = byteArrayOutputStream.toByteArray();        String str = new String(stringBytes);        return str;    }}
界面就不写了。
要注意几个地方：
①模拟器访问本机服务器127.0.01（locahost）的话，使用的地址是：10.0.2.2
②post比get方法多了三个要发送的数据头(header)
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