Android 连接tomcat模拟登陆账号

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity"
tools:ignore="MergeRootFrame">

<TextView
android:text="请输入账号"
android:layout_height="wrap_content"
android:layout_width="wrap_content" />

<EditText
android:id="@+id/username"
android:text="heyiyong"
android:layout_height="wrap_content"
android:layout_width="fill_parent" />

<TextView
android:text="请输入密码"
android:layout_height="wrap_content"
android:layout_width="wrap_content" />

<EditText
android:text="123"
android:inputType="textPassword"
android:id="@+id/password"
android:layout_height="wrap_content"
android:layout_width="fill_parent" />

<Button
android:onClick="click"
android:text="登陆"
android:layout_height="wrap_content"
android:layout_width="wrap_content" />

</LinearLayout>

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.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

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);
}

public void click(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/login.jsp";
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=" + username + "&password=" + password);
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();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
final String responseMsg = bufferedReader.readLine();
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();
}

}
}

<%
String username = request.getParameter("username");
String password = request.getParameter("password");
System.out.println("username = " + username);
System.out.println("password = " + password);
if("heyiyong".equals(username) && "123".equals(password)) {
response.getOutputStream().write("login successful!".getBytes());
} else {
response.getOutputStream().write("wrong username or password.".getBytes());
}
%>