JSON

myeclipse接口

public String loginb(String phone, String pwd) throws  Exception,SQLException {
            
            ConnectDatabase();
    
            
            String sql="select id,flag from user where phone=? and password=?";
            ps=con.prepareStatement(sql);
            ps.setString(1, phone);
            ps.setString(2, pwd);
            rs=ps.executeQuery();
                
            if(rs.next()){


                int id=rs.getInt(1);
                int flag=rs.getInt(2);
                User u =new User();
                u.setId(id);
                u.setId(flag);
                u.setPhone(phone);
                u.setPassword(pwd);
//                return u;
//                写成json数据
                if(u!=null){
                Gson gson=new Gson();
                String json=gson.toJson(u);
                return json;
                
                }
                
            }
            closeResource();
            return null;
    }
    

Android Studio

package com.qh.androiddemo;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.os.StrictMode;
import android.renderscript.Int2;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.app.LoaderManager.LoaderCallbacks;
import android.content.ContentResolver;
import android.content.CursorLoader;
import android.content.Loader;
import android.database.Cursor;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build.VERSION;
import android.os.Build;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.EditorInfo;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.qh.androiddemo.util.ConfigUtil;
import com.qh.androiddemo.util.SoapUtil;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;

import static android.Manifest.permission.READ_CONTACTS;
import static android.R.attr.id;

/**
 * A login screen that offers login via email/password.
 */
public class LoginActivity extends AppCompatActivity  {

    /**
     * Id to identity READ_CONTACTS permission request.
     */
    private static final int REQUEST_READ_CONTACTS = 0;

    /**
     * A dummy authentication store containing known user names and passwords.
     * TODO: remove after connecting to a real authentication system.
     */
    private static final String[] DUMMY_CREDENTIALS = new String[]{
            "foo@example.com:hello", "bar@example.com:world"
            //           Toast.makeText(getApplicationContext(), "登录失败！", Toast.LENGTH_LONG).show();

    };
    /**
     * Keep track of the login task to ensure we can cancel it if requested.
     */
    private UserLoginTask mAuthTask = null;

    // UI references.
    private AutoCompleteTextView mEmailView;
    private EditText mPasswordView;
    private View mProgressView;
    private View mLoginFormView;
    ConfigUtil configUtil;


    private SharedPreferences sp;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        // Set up the login form.
        //获得实例对象
        sp = this.getSharedPreferences("userInfo", Context.MODE_WORLD_READABLE);

        if(sp.getBoolean("AUTO_ISCHECK", true))
        {


            //跳转界面
            Intent intent = new Intent(LoginActivity.this,index.class);
            LoginActivity.this.startActivity(intent);

        }
        configUtil=new ConfigUtil(this);

        mEmailView = (AutoCompleteTextView) findViewById(R.id.email);



        mPasswordView = (EditText) findViewById(R.id.password);
        mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
                if (id == R.id.login || id == EditorInfo.IME_NULL) {
                    attemptLogin();
                    return true;
                }
                return false;
            }
        });

        Button mEmailSignInButton = (Button) findViewById(R.id.email_sign_in_button);


        StrictMode.ThreadPolicy policy=new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);

        mEmailSignInButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                attemptLogin();
            }
        });

        mLoginFormView = findViewById(R.id.login_form);
        mProgressView = findViewById(R.id.login_progress);
    }

    public void reg(View v) {

        Intent intent=new Intent(LoginActivity.this,RegActivity.class);
        startActivity(intent);

    }
    public void wjmm(View v){
        Intent intent=new Intent(LoginActivity.this,PasswordActivity.class);
        startActivity(intent);

    }

    /**
     * Attempts to sign in or register the account specified by the login form.
     * If there are form errors (invalid email, missing fields, etc.), the
     * errors are presented and no actual login attempt is made.
     */
    private void attemptLogin() {
        if (mAuthTask != null) {
         return ;

        }



        // Reset errors.
        mEmailView.setError(null);
        mPasswordView.setError(null);

        // Store values at the time of the login attempt.
        String email = mEmailView.getText().toString();
        String password = mPasswordView.getText().toString();

        boolean cancel = false;
        View focusView = null;

        // Check for a valid password, if the user entered one.
        if (!TextUtils.isEmpty(password) && !isPasswordValid(password)) {
            mPasswordView.setError(getString(R.string.error_invalid_password));
            focusView = mPasswordView;
            cancel = true;
        }

        // Check for a valid email address.
        if (TextUtils.isEmpty(email)) {
            mEmailView.setError(getString(R.string.error_field_required));
            focusView = mEmailView;
            cancel = true;
        } else if (!isEmailValid(email)) {
            mEmailView.setError(getString(R.string.error_invalid_email));
            focusView = mEmailView;
            cancel = true;
        }

        if (cancel) {
            // There was an error; don't attempt login and focus the first
            // form field with an error.
            focusView.requestFocus();
        } else {
            // Show a progress spinner, and kick off a background task to
            // perform the user login attempt.
            showProgress(true);
            mAuthTask = new UserLoginTask(email, password);
            mAuthTask.execute((Void) null);
            login();

        }
    }
    private void login(){
        String endPort = "cre_ServicePort";
        String method="loginb_service";
        Object[] objects=new Object[]{
                mEmailView.getText().toString(),
                mPasswordView.getText().toString()
        };
        SoapUtil soapUtil = new SoapUtil();
        Object object = soapUtil.connect(endPort,method,objects);


    if(object.toString()!=null){

//        configUtil.setUserJson(object.toString());

        //记住用户名、密码、
        SharedPreferences.Editor editor = sp.edit();
        editor.putString("USER_NAME", object.toString());
        editor.putBoolean("AUTO_ISCHECK", true);
        editor.commit();

//        SharedPreferences sharedPreferences= getSharedPreferences("test", Activity.MODE_PRIVATE);
        //实例化SharedPreferences.Editor对象
//        SharedPreferences.Editor editor = sharedPreferences.edit();
        //用putString的方法保存数据
//        editor.putBoolean("USER_ISLOGIN",true);
//        editor.putString("USER_ID", object.toString());
//        editor.putString("USER_PWD", "pwd123");
        //提交当前数据
//        editor.apply();

//        Toast.makeText(getApplicationContext(),
//                sp.getString("USER_NAME",object.toString())+ sp.getBoolean("AUTO_ISCHECK",true),
//                Toast.LENGTH_LONG).show();

//        解析json数据
        String jsonString=sp.getString("USER_NAME",object.toString());

        JSONObject demoJson = null;
        try {
            demoJson = new JSONObject(jsonString);
//            String name = demoJson.getString("phone");
            int id=demoJson.getInt("id");
            String flag = demoJson.getString("flag");

            Toast.makeText(getApplicationContext(),
                    "flag:"+flag+",id:"+id,
                    Toast.LENGTH_LONG).show();
        } catch (JSONException e) {
            e.printStackTrace();
        }




//        Toast.makeText(getApplicationContext(), object.toString(), Toast.LENGTH_LONG).show();
       ;
        Intent intent = new Intent(LoginActivity.this, index.class);
        startActivity(intent);

    }else {
        Intent intent = new Intent(LoginActivity.this, LoginActivity.class);
        startActivity(intent);
        Toast.makeText(getApplicationContext(), "登录失败！", Toast.LENGTH_LONG).show();
    }




//        if (Integer.parseInt(object.toString()) != 0) {
//
//            SharedPreferences sharedPreferences= getSharedPreferences("test", Activity.MODE_PRIVATE);
//            //实例化SharedPreferences.Editor对象
//            SharedPreferences.Editor editor = sharedPreferences.edit();
//            //用putString的方法保存数据
//            editor.putBoolean("USER_ISLOGIN",true);
//            editor.putString("USER_ID", "123456");
//            editor.putString("USER_PWD", "pwd123");
//            //提交当前数据
//            editor.apply();
//
//            Intent intent = new Intent(LoginActivity.this, index.class);
//            startActivity(intent);
////                        Toast.makeText(getApplicationContext(), "登录成功！", Toast.LENGTH_LONG).show();
//
//        } else {
//            Intent intent = new Intent(LoginActivity.this, LoginActivity.class);
//            startActivity(intent);
//            Toast.makeText(getApplicationContext(), "登录失败！", Toast.LENGTH_LONG).show();
//        }
   }



    private boolean isEmailValid(String email) {
        //TODO: Replace this with your own logic
//        return email.contains("@");
        return email.length() == 11;
    }

    private boolean isPasswordValid(String password) {
        //TODO: Replace this with your own logic
        return password.length() > 4;
    }

    /**
     * Shows the progress UI and hides the login form.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
    private void showProgress(final boolean show) {
        // On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
        // for very easy animations. If available, use these APIs to fade-in
        // the progress spinner.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
            int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);

            mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
            mLoginFormView.animate().setDuration(shortAnimTime).alpha(
                    show ? 0 : 1).setListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
                }
            });

            mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
            mProgressView.animate().setDuration(shortAnimTime).alpha(
                    show ? 1 : 0).setListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
                }
            });
        } else {
            // The ViewPropertyAnimator APIs are not available, so simply show
            // and hide the relevant UI components.
            mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
            mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
        }
    }



    private void addEmailsToAutoComplete(List<String> emailAddressCollection) {
        //Create adapter to tell the AutoCompleteTextView what to show in its dropdown list.
        ArrayAdapter<String> adapter =
                new ArrayAdapter<>(LoginActivity.this,
                        android.R.layout.simple_dropdown_item_1line, emailAddressCollection);

        mEmailView.setAdapter(adapter);
    }

    private interface ProfileQuery {
        String[] PROJECTION = {
                ContactsContract.CommonDataKinds.Email.ADDRESS,
                ContactsContract.CommonDataKinds.Email.IS_PRIMARY,
        };

        int ADDRESS = 0;
        int IS_PRIMARY = 1;
    }

    /**
     * Use an AsyncTask to fetch the user's email addresses on a background thread, and update
     * the email text field with results on the main UI thread.
     */
    class SetupEmailAutoCompleteTask extends AsyncTask<Void, Void, List<String>> {

        @Override
        protected List<String> doInBackground(Void... voids) {
            ArrayList<String> emailAddressCollection = new ArrayList<>();

            // Get all emails from the user's contacts and copy them to a list.
            ContentResolver cr = getContentResolver();
            Cursor emailCur = cr.query(ContactsContract.CommonDataKinds.Email.CONTENT_URI, null,
                    null, null, null);
            while (emailCur.moveToNext()) {
                String email = emailCur.getString(emailCur.getColumnIndex(ContactsContract
                        .CommonDataKinds.Email.DATA));
                emailAddressCollection.add(email);
            }
            emailCur.close();

            return emailAddressCollection;
        }

        @Override
        protected void onPostExecute(List<String> emailAddressCollection) {
            addEmailsToAutoComplete(emailAddressCollection);
        }
    }

    /**
     * Represents an asynchronous login/registration task used to authenticate
     * the user.
     */
    public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {

        private final String mEmail;
        private final String mPassword;

        UserLoginTask(String email, String password) {
            mEmail = email;
            mPassword = password;
        }

        @Override
        protected Boolean doInBackground(Void... params) {
            // TODO: attempt authentication against a network service.

            try {
                // Simulate network access.
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                return false;
            }

            for (String credential : DUMMY_CREDENTIALS) {
                String[] pieces = credential.split(":");
                if (pieces[0].equals(mEmail)) {
                    // Account exists, return true if the password matches.
                    return pieces[1].equals(mPassword);
                }
            }

            // TODO: register the new account here.
            return true;
        }

        @Override
        protected void onPostExecute(final Boolean success) {
            mAuthTask = null;
            showProgress(false);

            if (success) {
                finish();
            } else {
                mPasswordView.setError(getString(R.string.error_incorrect_password));
                mPasswordView.requestFocus();
            }
        }

        @Override
        protected void onCancelled() {
            mAuthTask = null;
            showProgress(false);
        }
    }
}

http://www.cnblogs.com/51ss/articles/2424815.html