diff --git a/.idea/dictionaries/.xml b/.idea/dictionaries/.xml
new file mode 100644
index 0000000..b7a9395
--- /dev/null
+++ b/.idea/dictionaries/.xml
@@ -0,0 +1,7 @@
+<component name="ProjectDictionaryState">
+  <dictionary name="盛洁">
+    <words>
+      <w>sttmt</w>
+    </words>
+  </dictionary>
+</component>
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 1f6cb0d..c2cb9c1 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -32,4 +32,5 @@ dependencies {
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test.ext:junit:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    implementation files('libs/mysql-connector-java-5.1.39-bin.jar')
 }
diff --git a/app/libs/mysql-connector-java-5.1.39-bin.jar b/app/libs/mysql-connector-java-5.1.39-bin.jar
new file mode 100644
index 0000000..dac6e14
Binary files /dev/null and b/app/libs/mysql-connector-java-5.1.39-bin.jar differ
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 3a8fd60..07c38dc 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,9 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="hunnu.sj.raise_money">
-
     <uses-permission android:name="android.permission.INTERNET" />
-
     <application
         android:allowBackup="true"
         android:icon="@drawable/img_2"
diff --git a/app/src/main/java/hunnu/sj/raise_money/DataBase/DatabaseHelper.java b/app/src/main/java/hunnu/sj/raise_money/DataBase/DatabaseHelper.java
index b3ed2bc..8693f41 100644
--- a/app/src/main/java/hunnu/sj/raise_money/DataBase/DatabaseHelper.java
+++ b/app/src/main/java/hunnu/sj/raise_money/DataBase/DatabaseHelper.java
@@ -3,9 +3,15 @@ import android.content.Context;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteDatabase.CursorFactory;
 import android.database.sqlite.SQLiteOpenHelper;
+import android.provider.ContactsContract;
 
-public class DatabaseHelper extends SQLiteOpenHelper {
-    static String name="user.db";
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+
+public class DatabaseHelper /*extends SQLiteOpenHelper*/ {
+    /*static String name="user.db";
     static int dbVersion=1;
     public DatabaseHelper(Context context) {
         super(context, name, null, dbVersion);
@@ -17,6 +23,33 @@ public class DatabaseHelper extends SQLiteOpenHelper {
     }
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
 
+    }*/
+    private static DatabaseHelper db = null;
+    private static Connection conn = null;
+    public static DatabaseHelper getDb(){
+        if(db ==null){
+            db = new DatabaseHelper();
+        }
+        return  db;
+    }
+
+
+    public static Connection getConnection(){
+        String username = "root";
+        String password ="";
+        if(conn==null){
+            try {
+                Class.forName("com.mysql.jdbc.Driver");
+                String url = "jdbc:mysql://172.18.22.77:3306/dogson?useSSL=true&characterEncoding=utf-8";
+                conn = DriverManager.getConnection(url,username,password);
+                return conn;
+            }catch(Exception e){
+                e.printStackTrace();
+            }
+            return null;
+        }
+        return conn;
+
     }
 
 }
diff --git a/app/src/main/java/hunnu/sj/raise_money/DataBase/UserService.java b/app/src/main/java/hunnu/sj/raise_money/DataBase/UserService.java
index 2510d25..a136e99 100644
--- a/app/src/main/java/hunnu/sj/raise_money/DataBase/UserService.java
+++ b/app/src/main/java/hunnu/sj/raise_money/DataBase/UserService.java
@@ -1,51 +1,72 @@
 package hunnu.sj.raise_money.DataBase;
-
-import android.content.Context;
-import android.database.Cursor;
-import android.database.sqlite.SQLiteDatabase;
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
 
 import hunnu.sj.raise_money.User;
 
 public class UserService {
-    public DatabaseHelper dbHelper;
-    public UserService(Context context){
-        dbHelper=new DatabaseHelper(context);
+    public DatabaseHelper db = null;
+    public Connection conn = null;
+    public UserService(){
+        this.db = DatabaseHelper.getDb();
     }
-
     public int login(String username,String password){
-        SQLiteDatabase sdb=dbHelper.getReadableDatabase();
-        String sql1 = "select * from user where username = ?";
-        String sql2 = "select * from user where username=? and password=?";
-        Cursor cursor1=sdb.rawQuery(sql1, new String[]{username});
-        Cursor cursor2=sdb.rawQuery(sql2, new String[]{username,password});
-        if(cursor1.moveToFirst()==false){
-            cursor1.close();
-            cursor2.close();
-            return 0;
+        conn = db.getConnection();
+        try{
+            Statement sttmt = conn.createStatement();
+            ResultSet rs1 = sttmt.executeQuery("select * from user where username = '"+username+"'");
+            boolean flag1 = rs1.next();
+            if(!flag1){
+                sttmt.close();
+                return 0;
+            }
+            ResultSet rs2 = sttmt.executeQuery("select * from user where username = '"+username+"'&&password = '"+password+"'");
+            boolean flag2 = rs2.next();
+            if(!flag2){
+                rs2.close();
+                sttmt.close();
+                return 1;
+            }
+            sttmt.close();
+            return 2;
+        }catch (Exception e){
+            e.printStackTrace();
         }
-        if(cursor2.moveToFirst()==false){
-            cursor1.close();
-            cursor2.close();
-            return 1;
-        }
-        cursor1.close();
-        cursor2.close();
-        return 2;
+            return 0;
     }
+
     public boolean register(User user){
-        SQLiteDatabase sdb=dbHelper.getReadableDatabase();
-        String sql="insert into user(username,password,role) values(?,?,?)";
-        Object obj[]={user.getName(),user.getPasd(),user.getRole()};
-        sdb.execSQL(sql, obj);
-        return true;
+        conn = db.getConnection();
+        try{
+            String sql = "insert into user(username,password,role) values('"+user.getName()+"','"+user.getPasd()+"','"+user.getRole()+"')";
+            Statement sttmt = conn.createStatement();
+            sttmt.executeUpdate(sql);
+            sttmt.close();
+            return true;
+        }catch (Exception e){
+            e.printStackTrace();
+        }
+        return false;
     }
 
     public String getRole(String username){
-        SQLiteDatabase sdb=dbHelper.getReadableDatabase();
-        String sql="select role from user where username = ?";
-        Cursor cursor=sdb.rawQuery(sql, new String[]{username});
-        cursor.moveToFirst();
-        String role = cursor.getString(cursor.getColumnIndex("role"));
-        return role;
+        //SQLiteDatabase sdb=dbHelper.getReadableDatabase();
+        String sql="select role from user where username = '" + username+"'";
+        conn = db.getConnection();
+        try{
+            Statement sttmt = conn.createStatement();
+            ResultSet rs = sttmt.executeQuery(sql);
+            rs.next();
+            String role = rs.getString(1);
+            rs.close();
+            sttmt.close();
+            return role;
+        }catch (SQLException e){
+            e.printStackTrace();
+        }
+        return null;
     }
+
 }
diff --git a/app/src/main/java/hunnu/sj/raise_money/RegiteActivity.java b/app/src/main/java/hunnu/sj/raise_money/RegiteActivity.java
index 6f9871a..f7cc146 100644
--- a/app/src/main/java/hunnu/sj/raise_money/RegiteActivity.java
+++ b/app/src/main/java/hunnu/sj/raise_money/RegiteActivity.java
@@ -1,9 +1,12 @@
 package hunnu.sj.raise_money;
 
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 
 import android.content.Intent;
 import android.os.Bundle;
+import android.os.Handler;
+import android.os.Message;
 import android.provider.MediaStore;
 import android.view.View;
 import android.widget.EditText;
@@ -15,7 +18,34 @@ import hunnu.sj.raise_money.DataBase.UserService;
 
 
 public class RegiteActivity extends AppCompatActivity {
-
+    EditText user_name;
+    EditText pass_word;
+    EditText repass_word;
+    RadioButton radio1;
+    RadioButton radio2;
+    String role;
+    Handler rHandler = new Handler(){
+        @Override
+        public void handleMessage(@NonNull Message msg) {
+            super.handleMessage(msg);
+            String txt = (String) msg.obj;
+            switch (msg.what){
+                case 0:
+                    user_name.setError(txt);
+                    break;
+                case 1:
+                    pass_word.setError(txt);
+                    break;
+                case 2:
+                    repass_word.setText("");
+                    repass_word.setError(txt);
+                    break;
+                case 3:
+                    user_name.setError(txt);
+                    break;
+            }
+        }
+    };
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -23,41 +53,54 @@ public class RegiteActivity extends AppCompatActivity {
     }
 
     public void onRegister(View view){
-        EditText user_name = findViewById(R.id.user_name);
-        EditText pass_word = findViewById(R.id.pass_word);
-        EditText repass_word = findViewById(R.id.repass_word);
-        String role = "默认角色";
-        RadioButton radio1 = findViewById(R.id.ratio1);
-        RadioButton radio2 = findViewById(R.id.radio2);
+        user_name = findViewById(R.id.user_name);
+        pass_word = findViewById(R.id.pass_word);
+        repass_word = findViewById(R.id.repass_word);
+        role = "默认角色";
+        radio1 = findViewById(R.id.ratio1);
+        radio2 = findViewById(R.id.radio2);
         if(radio1.isChecked()){
             role = "爱心人士";
         }else if(radio2.isChecked()){
             role = "贫困学生";
         }
-        String username = user_name.getText().toString();
-        String password = pass_word.getText().toString();
-        String repassword = repass_word.getText().toString();
-        UserService uService = new UserService(RegiteActivity.this);
-        if(username.trim().equals("")){
-            user_name.setError("请输入昵称");
-        }else if(password.trim().equals("")){
-            pass_word.setError("请输入密码");
-        }
-        if(!password.equals(repassword)){
-            repass_word.setText("");
-            repass_word.setError("密码验证错误");
-        }else if(uService.login(username,password)==1){
-            user_name.setError("用户已存在");
-        }else{
-            User user = new User();
-            user.setName(username);
-            user.setPasd(password);
-            user.setRole(role);
-            uService.register(user);
-            Intent intent = new Intent(this,SignInActivity.class);
-            startActivity(intent);
-        }
-
+        new RegiteThread().start();
+    }
 
+    class RegiteThread extends Thread{
+        @Override
+        public void run() {
+            String username = user_name.getText().toString();
+            String password = pass_word.getText().toString();
+            String repassword = repass_word.getText().toString();
+            UserService uService = new UserService();
+            Message message = rHandler.obtainMessage();
+            if(username.trim().equals("")){
+                message.what = 0;
+                message.obj = "请输入用户名";
+                rHandler.sendMessage(message);
+            }else if(password.trim().equals("")){
+                message.what = 1;
+                message.obj = "请输入密码";
+                rHandler.sendMessage(message);
+            }
+            if(!password.equals(repassword)){
+                message.what = 2;
+                message.obj = "密码验证错误";
+                rHandler.sendMessage(message);
+            }else if(uService.login(username,password)==1){
+                message.what = 3;
+                message.obj = "用户已存在";
+            }else{
+                User user = new User();
+                user.setName(username);
+                user.setPasd(password);
+                user.setRole(role);
+                uService.register(user);
+                Intent intent = new Intent(RegiteActivity.this,SignInActivity.class);
+                startActivity(intent);
+                finish();
+            }
+        }
     }
 }
diff --git a/app/src/main/java/hunnu/sj/raise_money/SignInActivity.java b/app/src/main/java/hunnu/sj/raise_money/SignInActivity.java
index 11c5046..e39abbc 100644
--- a/app/src/main/java/hunnu/sj/raise_money/SignInActivity.java
+++ b/app/src/main/java/hunnu/sj/raise_money/SignInActivity.java
@@ -1,23 +1,45 @@
 package hunnu.sj.raise_money;
 
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 
 import android.content.Intent;
 import android.os.Bundle;
+import android.os.Handler;
 import android.os.Message;
 import android.view.View;
 import android.widget.EditText;
 
-import java.io.Serializable;
-import java.sql.Connection;
-import java.sql.PreparedStatement;
-import java.sql.ResultSet;
-import java.sql.SQLException;
 
 import hunnu.sj.raise_money.DataBase.UserService;
 
 public class SignInActivity extends AppCompatActivity {
     public static final String IS_SIGNIN = "is.user.sign.in";
+    public static final int SEND = 0;
+    EditText usnm;
+    EditText pswd;
+    User user;
+    Handler mHandler  = new Handler(){
+        int flag = -1;
+        @Override
+        public void handleMessage(@NonNull Message msg) {
+            super.handleMessage(msg);
+            String txt;
+            switch (msg.what){
+                case 0:
+                    flag = 0;
+                    txt = (String) msg.obj;
+                    usnm.setError(txt);
+                    break;
+                case 1:
+                    flag = 1;
+                    txt = (String) msg.obj;
+                    pswd.setError(txt);
+                    break;
+            }
+
+        }
+    };
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -25,36 +47,46 @@ public class SignInActivity extends AppCompatActivity {
     }
 
     public void user_commit(View view){
-        EditText usnm = findViewById(R.id.user_name);
-        EditText pswd = findViewById(R.id.pass_word);
-        String name = usnm.getText().toString();
-        String pasd = pswd.getText().toString();
-
-
-        UserService uService = new UserService(SignInActivity.this);
-        if(uService.login(name,pasd)==0){
-            usnm.setError("用户名错误");
-        }else if(uService.login(name,pasd)==1){
-            pswd.setError("密码错误");
-        }else{
+        usnm = findViewById(R.id.user_name);
+        pswd = findViewById(R.id.pass_word);
+        new LoginThread().start();
+    }
+
+    public void onToRegister(View view){
+        Intent intent = new Intent(this,RegiteActivity.class);
+        startActivity(intent);
+    }
+
+    class LoginThread extends Thread{
+        @Override
+        public void run() {
+            int flag = -1;
+            String name = usnm.getText().toString();
+            String pasd = pswd.getText().toString();
+            UserService uService = new UserService();
+            flag = uService.login(name,pasd);
+            Message message = mHandler.obtainMessage();
+            if(flag==0){
+                message.what = 0;
+                message.obj = "用户名不存在";
+                mHandler.sendMessage(message);
+            }else if(flag==1){
+                message.what = 1;
+                message.obj = "密码错误";
+                mHandler.sendMessage(message);
+            }else{
             User user = new User();
             user.setName(name);
             user.setPasd(pasd);
             String role = uService.getRole(name);
             user.setRole(role);
-            //String role = uService.getRole(name);
-            //user.setRole(role);
             Bundle bundle = new Bundle();
             bundle.putSerializable("user",user);
-            Intent intent =new Intent(this,MainActivity.class);
+            Intent intent =new Intent(SignInActivity.this,MainActivity.class);
             intent.putExtras(bundle);
             startActivity(intent);
+            finish();
+            }
         }
-
-    }
-
-    public void onToRegister(View view){
-        Intent intent = new Intent(this,RegiteActivity.class);
-        startActivity(intent);
     }
 }