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();        }    }}

不要忘记权限：

<uses-permission android:name="android.permission.INTERNET"/>

jsp页面为：

<%    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());    }%>

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