客户端：
1、登录时检查网络状态
2、登录加载进度条
3、登录服务器端进行验证，如果用户名和密码存在且正确，则登录，否则失败
4、注册时将用户信息保存到服务器端数据库中(MySQL)
5、记住密码功能（还不完善，只是测试）
6、对密码信息进行md5()单向加密
服务器端：
1、接收客户端发来的登录请求，如果用户名和密码存在于MySQL数据库中则返回客户端一个响应信息"success"
2、接收客户端发来的注册请求，将用户名和密码存放到MySQL数据库中
不过目前还存在很多问题，以后有时间继续更新
下面是效果图：
完整代码下载：http://115.com/file/bexv3qlf#LoginDemo.zip
备份地址：
http://download.csdn.net/detail/az44yao/4871847
客户端代码：
登录代码：这里是使用HttpClient来进行与服务器端的交互的，密码加密部分只是简单的用了下md5()，如果正式的项目中可以选用非对称加密算法会更加安全
package com.loulijun.logindemo;
import java.security.MessageDigest;
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.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.net.ConnectivityManager;
import android.net.NetworkInfo.State;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.provider.Settings;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.Toast;
public class LoginDemoActivity extends Activity {
/** Called when the activity is first created. */
private Button loginBtn;
private Button registerBtn;
private EditText inputUsername;
private EditText inputPassword;
private CheckBox saveInfoItem;
private ProgressDialog mDialog;
private String responseMsg = "";
private static final int REQUEST_TIMEOUT = 5*1000;//设置请求超时10秒钟
private static final int SO_TIMEOUT = 10*1000; //设置等待数据超时时间10秒钟
private static final int LOGIN_OK = 1;
private SharedPreferences sp;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
loginBtn = (Button)findViewById(R.id.login_btn_login);
registerBtn = (Button)findViewById(R.id.login_btn_zhuce);
inputUsername = (EditText)findViewById(R.id.login_edit_account);
inputPassword = (EditText)findViewById(R.id.login_edit_pwd);
saveInfoItem = (CheckBox)findViewById(R.id.login_cb_savepwd);
sp = getSharedPreferences("userdata",0);
//初始化数据
LoadUserdata();
//检查网络
CheckNetworkState();
//监听记住密码选项
saveInfoItem.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()
{
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
//载入用户信息
Editor editor = sp.edit();
if(saveInfoItem.isChecked())
{
//获取已经存在的用户名和密码
String realUsername = sp.getString("username", "");
String realPassword = sp.getString("password", "");
editor.putBoolean("checkstatus", true);
editor.commit();
if((!realUsername.equals(""))&&!(realUsername==null)||(!realPassword.equals(""))||!(realPassword==null))
{
//清空输入框
inputUsername.setText("");
inputPassword.setText("");
//设置已有值
inputUsername.setText(realUsername);
inputPassword.setText(realPassword);
}
}else
{
editor.putBoolean("checkstatus", false);
editor.commit();
//清空输入框
inputUsername.setText("");
inputPassword.setText("");
}
}
});
//登录
loginBtn.setOnClickListener(new Button.OnClickListener()
{
@Override
public void onClick(View arg0) {
mDialog = new ProgressDialog(LoginDemoActivity.this);
mDialog.setTitle("登陆");
mDialog.setMessage("正在登陆服务器，请稍后...");
mDialog.show();
Thread loginThread = new Thread(new LoginThread());
loginThread.start();
}
});
registerBtn.setOnClickListener(new Button.OnClickListener()
{
@Override
public void onClick(View arg0) {
Intent intent = new Intent();
intent.setClass(LoginDemoActivity.this, RegisterActivity.class);
startActivity(intent);
}
});
}
private boolean loginServer(String username, String password)
{
boolean loginValidate = false;
//使用apache HTTP客户端实现
String urlStr = "http://192.168.1.101:8080/LoginServlet/LoginServlet";
HttpPost request = new HttpPost(urlStr);
//如果传递参数多的话，可以丢传递的参数进行封装
List<NameValuePair> params = new ArrayList<NameValuePair>();
//添加用户名和密码
params.add(new BasicNameValuePair("username",username));
params.add(new BasicNameValuePair("password",password));
try
{
//设置请求参数项
request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
HttpClient client = getHttpClient();
//执行请求返回相应
HttpResponse response = client.execute(request);
//判断是否请求成功
if(response.getStatusLine().getStatusCode()==200)
{
loginValidate = true;
//获得响应信息
responseMsg = EntityUtils.toString(response.getEntity());
}
}catch(Exception e)
{
e.printStackTrace();
}
return loginValidate;
}
//初始化HttpClient，并设置超时
public HttpClient getHttpClient()
{
BasicHttpParams httpParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParams, REQUEST_TIMEOUT);
HttpConnectionParams.setSoTimeout(httpParams, SO_TIMEOUT);
HttpClient client = new DefaultHttpClient(httpParams);
return client;
}
//判断是否记住密码，默认记住
private boolean isRemembered() {
try {
if (saveInfoItem.isChecked()) {
return true;
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return false;
}
//初始化用户数据
private void LoadUserdata()
{
boolean checkstatus = sp.getBoolean("checkstatus", false);
if(checkstatus)
{
saveInfoItem.setChecked(true);
//载入用户信息
//获取已经存在的用户名和密码
String realUsername = sp.getString("username", "");
String realPassword = sp.getString("password", "");
if((!realUsername.equals(""))&&!(realUsername==null)||(!realPassword.equals(""))||!(realPassword==null))
{
inputUsername.setText("");
inputPassword.setText("");
inputUsername.setText(realUsername);
inputPassword.setText(realPassword);
}
}else
{
saveInfoItem.setChecked(false);
inputUsername.setText("");
inputPassword.setText("");
}
}
//检查网络状态
public void CheckNetworkState()
{
boolean flag = false;
ConnectivityManager manager = (ConnectivityManager)getSystemService(
Context.CONNECTIVITY_SERVICE);
State mobile = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();
State wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();
//如果3G、wifi、2G等网络状态是连接的，则退出，否则显示提示信息进入网络设置界面
if(mobile == State.CONNECTED||mobile==State.CONNECTING)
return;
if(wifi == State.CONNECTED||wifi==State.CONNECTING)
return;
showTips();
}
private void showTips()
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setIcon(android.R.drawable.ic_dialog_alert);
builder.setTitle("没有可用网络");
builder.setMessage("当前网络不可用，是否设置网络？");
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// 如果没有网络连接，则进入网络设置界面
startActivity(new Intent(Settings.ACTION_WIRELESS_SETTINGS));
}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
LoginDemoActivity.this.finish();
}
});
builder.create();
builder.show();
}
//Handler
Handler handler = new Handler()
{
public void handleMessage(Message msg)
{
switch(msg.what)
{
case 0:
mDialog.cancel();
Toast.makeText(getApplicationContext(), "登录成功！", Toast.LENGTH_SHORT).show();
Intent intent = new Intent();
intent.setClass(LoginDemoActivity.this, MainActivity.class);
startActivity(intent);
finish();
break;
case 1:
mDialog.cancel();
Toast.makeText(getApplicationContext(), "密码错误", Toast.LENGTH_SHORT).show();
break;
case 2:
mDialog.cancel();
Toast.makeText(getApplicationContext(), "URL验证失败", Toast.LENGTH_SHORT).show();
break;
}
}
};
//LoginThread线程类
class LoginThread implements Runnable
{
@Override
public void run() {
String username = inputUsername.getText().toString();
String password = inputPassword.getText().toString();
boolean checkstatus = sp.getBoolean("checkstatus", false);
if(checkstatus)
{
//获取已经存在的用户名和密码
String realUsername = sp.getString("username", "");
String realPassword = sp.getString("password", "");
if((!realUsername.equals(""))&&!(realUsername==null)||(!realPassword.equals(""))||!(realPassword==null))
{
if(username.equals(realUsername)&&password.equals(realPassword))
{
username = inputUsername.getText().toString();
password = inputPassword.getText().toString();
}
}
}else
{
password = md5(password);
}
System.out.println("username="+username+":password="+password);
//URL合法，但是这一步并不验证密码是否正确
boolean loginValidate = loginServer(username, password);
System.out.println("----------------------------bool is :"+loginValidate+"----------response:"+responseMsg);
Message msg = handler.obtainMessage();
if(loginValidate)
{
if(responseMsg.equals("success"))
{
msg.what = 0;
handler.sendMessage(msg);
}else
{
msg.what = 1;
handler.sendMessage(msg);
}
}else
{
msg.what = 2;
handler.sendMessage(msg);
}
}
}
/**
* MD5单向加密，32位，用于加密密码，因为明文密码在信道中传输不安全，明文保存在本地也不安全
* @param str
* @return
*/
public static String md5(String str)
{
MessageDigest md5 = null;
try
{
md5 = MessageDigest.getInstance("MD5");
}catch(Exception e)
{
e.printStackTrace();
return "";
}
char[] charArray = str.toCharArray();
byte[] byteArray = new byte[charArray.length];
for(int i = 0; i < charArray.length; i++)
{
byteArray[i] = (byte)charArray[i];
}
byte[] md5Bytes = md5.digest(byteArray);
StringBuffer hexValue = new StringBuffer();
for( int i = 0; i < md5Bytes.length; i++)
{
int val = ((int)md5Bytes[i])&0xff;
if(val < 16)
{
hexValue.append("0");
}
hexValue.append(Integer.toHexString(val));
}
return hexValue.toString();
}
}
注册代码
package com.loulijun.logindemo;
import java.security.MessageDigest;
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.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import com.loulijun.logindemo.LoginDemoActivity.LoginThread;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class RegisterActivity extends Activity {
private EditText newUser,newPassword,confirmPassword;
private Button registerBtn, clearBtn;
private ProgressDialog mDialog;
private String responseMsg = "";
private static final int REQUEST_TIMEOUT = 5*1000;//设置请求超时10秒钟
private static final int SO_TIMEOUT = 10*1000; //设置等待数据超时时间10秒钟
private static final int LOGIN_OK = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.register);
newUser = (EditText)findViewById(R.id.newUser_input);
newPassword = (EditText)findViewById(R.id.newPassword_input);
confirmPassword = (EditText)findViewById(R.id.Confirm_input);
registerBtn = (Button)findViewById(R.id.registerbtn);
clearBtn = (Button)findViewById(R.id.clearbtn);
registerBtn.setOnClickListener(new Button.OnClickListener()
{
@Override
public void onClick(View v) {
String newusername = newUser.getText().toString();
String newpassword = md5(newPassword.getText().toString());
String confirmpwd = md5(confirmPassword.getText().toString());
if(newpassword.equals(confirmpwd))
{
SharedPreferences sp = getSharedPreferences("userdata",0);
Editor editor = sp.edit();
editor.putString("username", newusername);
editor.putString("password", newpassword);
editor.commit();
mDialog = new ProgressDialog(RegisterActivity.this);
mDialog.setTitle("登陆");
mDialog.setMessage("正在登陆服务器，请稍后...");
mDialog.show();
Thread loginThread = new Thread(new RegisterThread());
loginThread.start();
}else
{
Toast.makeText(getApplicationContext(), "您两次输入的密码不一致！", Toast.LENGTH_SHORT).show();
}
}
});
clearBtn.setOnClickListener(new Button.OnClickListener()
{
@Override
public void onClick(View v) {
newUser.setText("");
newPassword.setText("");
confirmPassword.setText("");
}
});
}
//初始化HttpClient，并设置超时
public HttpClient getHttpClient()
{
BasicHttpParams httpParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParams, REQUEST_TIMEOUT);
HttpConnectionParams.setSoTimeout(httpParams, SO_TIMEOUT);
HttpClient client = new DefaultHttpClient(httpParams);
return client;
}
private boolean registerServer(String username, String password)
{
boolean loginValidate = false;
//使用apache HTTP客户端实现
String urlStr = "http://192.168.1.101:8080/LoginServlet/RegisterServlet";
HttpPost request = new HttpPost(urlStr);
//如果传递参数多的话，可以丢传递的参数进行封装
List<NameValuePair> params = new ArrayList<NameValuePair>();
//添加用户名和密码
params.add(new BasicNameValuePair("username",username));
params.add(new BasicNameValuePair("password",password));
try
{
//设置请求参数项
request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
HttpClient client = getHttpClient();
//执行请求返回相应
HttpResponse response = client.execute(request);
//判断是否请求成功
if(response.getStatusLine().getStatusCode()==200)
{
loginValidate = true;
//获得响应信息
responseMsg = EntityUtils.toString(response.getEntity());
}
}catch(Exception e)
{
e.printStackTrace();
}
return loginValidate;
}
//Handler
Handler handler = new Handler()
{
public void handleMessage(Message msg)
{
switch(msg.what)
{
case 0:
mDialog.cancel();
showDialog("注册成功！");
break;
case 1:
mDialog.cancel();
Toast.makeText(getApplicationContext(), "注册失败", Toast.LENGTH_SHORT).show();
break;
case 2:
mDialog.cancel();
Toast.makeText(getApplicationContext(), "URL验证失败", Toast.LENGTH_SHORT).show();
break;
}
}
};
//RegisterThread线程类
class RegisterThread implements Runnable
{
@Override
public void run() {
String username = newUser.getText().toString();
String password = md5(newPassword.getText().toString());
//URL合法，但是这一步并不验证密码是否正确
boolean registerValidate = registerServer(username, password);
//System.out.println("----------------------------bool is :"+registerValidate+"----------response:"+responseMsg);
Message msg = handler.obtainMessage();
if(registerValidate)
{
if(responseMsg.equals("success"))
{
msg.what = 0;
handler.sendMessage(msg);
}else
{
msg.what = 1;
handler.sendMessage(msg);
}
}else
{
msg.what = 2;
handler.sendMessage(msg);
}
}
}
private void showDialog(String str)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("注册");
builder.setMessage(str);
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
Intent intent = new Intent();
intent.setClass(RegisterActivity.this, LoginDemoActivity.class);
startActivity(intent);
finish();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}
/**
* MD5单向加密，32位，用于加密密码，因为明文密码在信道中传输不安全，明文保存在本地也不安全
* @param str
* @return
*/
public static String md5(String str)
{
MessageDigest md5 = null;
try
{
md5 = MessageDigest.getInstance("MD5");
}catch(Exception e)
{
e.printStackTrace();
return "";
}
char[] charArray = str.toCharArray();
byte[] byteArray = new byte[charArray.length];
for(int i = 0; i < charArray.length; i++)
{
byteArray[i] = (byte)charArray[i];
}
byte[] md5Bytes = md5.digest(byteArray);
StringBuffer hexValue = new StringBuffer();
for( int i = 0; i < md5Bytes.length; i++)
{
int val = ((int)md5Bytes[i])&0xff;
if(val < 16)
{
hexValue.append("0");
}
hexValue.append(Integer.toHexString(val));
}
return hexValue.toString();
}
}
主界面的布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/loginRoot"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/linear1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/default_bg"
android:orientation="vertical"
>
<RelativeLayout
android:id="@+id/relativelayout2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15.0px"
android:layout_marginRight="15.0px"
android:layout_marginTop="62.0px"
android:background="@drawable/login_back"
android:paddingBottom="10.0px"
android:paddingTop="21.0px"
>
<ImageView
android:id="@+id/faceImg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/login_head"
/>
<EditText
android:id="@+id/login_edit_account"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginBottom="5.0dip"
android:layout_marginLeft="5.0dip"
android:layout_marginTop="5.0dip"
android:layout_marginRight="5.0dip"
android:layout_toRightOf="@+id/faceImg"
android:background="@drawable/edit_login"
android:hint="@string/username_hint"
android:singleLine="true"
android:paddingLeft="45.0sp"
android:saveEnabled="true"
android:textColor="#ff3f3f3f"
/>
<TextView
android:id="@+id/textview01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/login_edit_account"
android:layout_alignLeft="@+id/login_edit_account"
android:layout_alignTop="@+id/login_edit_account"
android:layout_marginRight="15.0sp"
android:gravity="center_vertical"
android:paddingLeft="7.0sp"
android:text="@string/username_input"
android:textColor="#ff3f3f3f"
android:textSize="16.0dip"
/>
<ImageButton
android:id="@+id/usernamespinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/login_edit_account"
android:layout_alignRight="@+id/login_edit_account"
android:layout_alignTop="@+id/login_edit_account"
android:layout_marginRight="1.0dip"
android:background="@drawable/more_select"
/>
<EditText
android:id="@+id/login_edit_pwd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/login_edit_account"
android:layout_alignRight="@+id/login_edit_account"
android:layout_below="@+id/login_edit_account"
android:layout_marginRight="1.0dip"
android:background="@drawable/edit_login"
android:password="true"
android:singleLine="true"
android:paddingLeft="45.0sp"
android:saveEnabled="true"
android:hint="@string/password_hint"
/>
<TextView
android:id="@+id/textview02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/login_edit_pwd"
android:layout_alignRight="@+id/textview01"
android:layout_alignTop="@+id/login_edit_pwd"
android:gravity="center_vertical"
android:paddingLeft="7.0sp"
android:text="@string/password_input"
android:textColor="#ff3f3f3f"
android:textSize="16.0dip"
/>
<CheckBox
android:id="@+id/login_cb_savepwd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/login_btn_login"
android:button="@drawable/btn_check"
android:paddingLeft="39.0px"
android:text="@string/opt_remember"
android:textColor="#ff222222"
android:textSize="16.0sp"
/>
<Button
android:id="@+id/login_btn_login"
android:layout_width="90.0dp"
android:layout_height="wrap_content"
android:layout_below="@+id/textview02"
android:layout_toLeftOf="@+id/login_btn_zhuce"
android:layout_marginTop="7.0px"
android:text="@string/login" />
<Button
android:id="@+id/login_btn_zhuce"
android:layout_width="90.0dp"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@+id/textview02"
android:layout_marginTop="7.0px"
android:text="@string/zhuce" />
</RelativeLayout>
</LinearLayout>
</LinearLayout>
服务器端：
服务器端采用的是Servlet，比较简单
需要创建一个表，MySQL的，这部分还没有放到代码中处理，数据库名：monitordb，表：username varchar(30),password(50)。注意配置一下MySQL的驱动
web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.loulijun.login.LoginServlet</servlet-class>
</servlet>
<!-- Define the Manager Servlet Mapping -->
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/LoginServlet</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>RegisterServlet</servlet-name>
<servlet-class>com.loulijun.login.RegisterServlet</servlet-class>
</servlet>
<!-- Define the Manager Servlet Mapping -->
<servlet-mapping>
<servlet-name>RegisterServlet</servlet-name>
<url-pattern>/RegisterServlet</url-pattern>
</servlet-mapping>
</web-app>
LoginServlet.java：用于登录信息的Servlet
package com.loulijun.login;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet
{
public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException
{
Connection conn;
PreparedStatement sql;
ResultSet rs;
try
{
Class.forName("com.mysql.jdbc.Driver");
}
catch (Exception e)
{
System.out.print(e);
}
String username = request.getParameter("username");
String password = request.getParameter("password");
response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
String msg = null;
String uri = "jdbc:mysql://127.0.0.1/monitordb";
String selectsql = "select username,password from user where username=? and password=?";
try
{
conn = DriverManager.getConnection(uri, "root", "loulijun");
sql = conn.prepareStatement(selectsql);
if(username!=null&&password!=null)
{
sql.setString(1,username);
sql.setString(2,password);
rs = sql.executeQuery();
boolean bool = rs.next();
if(bool == true)
{
msg = "success";
}else
{
msg = "failed";
}
}else
{
msg = "failed";
}
conn.close();
}
catch (SQLException e)
{
System.out.print(e);
}
out.print(msg);
out.flush();
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException,IOException
{
doGet(request, response);
}
}
RegisterServlet.java：用于处理注册信息的Servlet
package com.loulijun.login;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class RegisterServlet extends HttpServlet
{
public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException
{
Connection conn;
PreparedStatement sql;
try
{
Class.forName("com.mysql.jdbc.Driver");
}
catch (Exception e)
{
System.out.print(e);
}
String username = request.getParameter("username");
String password = request.getParameter("password");
response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
String msg = null;
if(username!=null&&password!=null)
{
msg = "success";
try
{
String uri = "jdbc:mysql://127.0.0.1/monitordb";
String insertSql = "insert into user values(?,?)";
conn = DriverManager.getConnection(uri, "root", "loulijun");
sql = conn.prepareStatement(insertSql);
sql.setString(1,username);
sql.setString(2,password);
int status = sql.executeUpdate();
if(status!=0)
{
System.out.print("添加数据成功！");
}else
{
System.out.print("添加数据失败");
}
conn.close();
}
catch (SQLException e)
{
System.out.print(e);
}
}else
{
msg = "failed";
}
out.print(msg);
out.flush();
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException,IOException
{
doGet(request, response);
}
}
