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Java 远程MySQL数据库的Android登录验证_Java_Android - Fatal编程技术网

Java 远程MySQL数据库的Android登录验证

Java 远程MySQL数据库的Android登录验证,java,android,Java,Android,以下是我的java代码: btnLogin.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { ArrayList < NameValuePair > postParameters = new ArrayList < NameValuePair > (); postParameters.add(new BasicNameVal

以下是我的java代码:

btnLogin.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
    ArrayList < NameValuePair > postParameters = new ArrayList < NameValuePair > ();
    postParameters.add(new BasicNameValuePair("username", txtUsername.getText().toString()));
    postParameters.add(new BasicNameValuePair("password", txtPassword.getText().toString()));

    //String valid = "1";  
    String response = null;
    try {
      response = CustomHttpClient.executeHttpPost("http://www.sampleweb.com/imba.php", postParameters);
      String res = response.toString();
      // res = res.trim();  
      res = res.replaceAll("\\s+", "");
      //error.setText(res);  
      if (res.equals("1")) {
        txtError.setText("Correct Username or Password");
        //Intent i = new Intent(CDroidMonitoringActivity.this, MenuClass.class);
        //startActivity(i);
      } else {
        txtError.setText("Sorry!! Incorrect Username or Password");
      }
    } catch (Exception e) {
      txtUsername.setText(e.toString());
    }
  }
});
btnLogin.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
ArrayListpostParameters=新的ArrayList();
添加(新的BasicNameValuePair(“用户名”,txtUsername.getText().toString());
添加(新的BasicNameValuePair(“密码”,txtPassword.getText().toString());
//字符串valid=“1”;
字符串响应=null;
试一试{
响应=CustomHttpClient.executeHttpPost(“http://www.sampleweb.com/imba.php“,后参数);
String res=response.toString();
//res=res.trim();
res=res.replaceAll(“\\s+”,”);
//错误.setText(res);
如果(相对等于(“1”)){
setText(“正确的用户名或密码”);
//意图i=新意图(CDroidMonitoringActivity.this,MenuClass.class);
//星触觉(i);
}否则{
setText(“对不起!!用户名或密码不正确”);
}
}捕获(例外e){
setText(例如toString());
}
}
});

我认为我的res.equals中有一个错误,因为它一直在说“无效的用户名或密码”,即使我输入了正确的用户名或密码。但是当我将res.equals更改为res.contains时,它会一直说“正确的用户名或密码”,即使我输入了正确的用户名和密码。我真的需要你的帮助。所有人都精通android开发。希望你能在这方面帮助我。而且,当我更改txterro.setText(res)只是为了检查它是否返回1和0时,它不会返回

这需要在php文件中完成,而不是在Android代码中:

<?php

define('DB_USER', "root"); //username used to connect to the database.
define('DB_PASSWORD', ""); //password used to connect to the database.
define('DB_DATABASE', "dbname"); //database name
define('DB_SERVER', "127.0.0.1"); //database server address

?>

使用JSON解析器,您需要解析服务器上的数据。您需要使用类似于以下内容的内容:

public class JSONParser {

    static InputStream is = null;
    static JSONObject jObj = null;
    static String json = "";

    public JSONParser() {

    }

    //Method to connect to the database
    public JSONObject makeHttpRequest(String url, String method, List<NameValuePair> params) {

        //The following works just as in normal GET and POST methods
        try {
            if(method == "POST"){
                // request method is POST
                // defaultHttpClient
                DefaultHttpClient httpClient = new DefaultHttpClient();
                HttpPost httpPost = new HttpPost(url);
                httpPost.setEntity(new UrlEncodedFormEntity(params));

                HttpResponse httpResponse = httpClient.execute(httpPost);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();

            }else if(method == "GET"){
                // request method is GET
                DefaultHttpClient httpClient = new DefaultHttpClient();
                String paramString = URLEncodedUtils.format(params, "utf-8");
                url += "?" + paramString;
                HttpGet httpGet = new HttpGet(url);

                HttpResponse httpResponse = httpClient.execute(httpGet);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();
            }           

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            json = sb.toString();
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }

        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }

        // return JSON String
        return jObj;

    }
}
公共类JSONParser{
静态InputStream为空;
静态JSONObject jObj=null;
静态字符串json=“”;
公共JSONParser(){
}
//方法连接到数据库
公共JSONObject makeHttpRequest(字符串url、字符串方法、列表参数){
//下面的工作方式与正常的GET和POST方法相同
试一试{
如果(方法==“POST”){
//请求方法为POST
//defaultHttpClient
DefaultHttpClient httpClient=新的DefaultHttpClient();
HttpPost HttpPost=新的HttpPost(url);
setEntity(新的UrlEncodedFormEntity(参数));
HttpResponse HttpResponse=httpClient.execute(httpPost);
HttpEntity HttpEntity=httpResponse.getEntity();
is=httpEntity.getContent();
}else if(方法==“GET”){
//请求方法是GET
DefaultHttpClient httpClient=新的DefaultHttpClient();
String paramString=URLEncodedUtils.format(params,“utf-8”);
url+=“?”+参数字符串;
HttpGet HttpGet=新的HttpGet(url);
HttpResponse HttpResponse=httpClient.execute(httpGet);
HttpEntity HttpEntity=httpResponse.getEntity();
is=httpEntity.getContent();
}           
}捕获(不支持的编码异常e){
e、 printStackTrace();
}捕获(客户端协议例外e){
e、 printStackTrace();
}捕获(IOE异常){
e、 printStackTrace();
}
试一试{
BufferedReader reader=新的BufferedReader(新的InputStreamReader(
is,“iso-8859-1”),8);
StringBuilder sb=新的StringBuilder();
字符串行=null;
而((line=reader.readLine())!=null){
sb.追加(第+行“\n”);
}
is.close();
json=sb.toString();
}捕获(例外e){
Log.e(“缓冲区错误”,“错误转换结果”+e.toString());
}
//尝试将字符串解析为JSON对象
试一试{
jObj=新的JSONObject(json);
}捕获(JSONException e){
Log.e(“JSON解析器”,“错误解析数据”+e.toString());
}
//返回JSON字符串
返回jObj;
}
}
在第二个类中,您需要按如下方式定义连接参数:

public class UserFunctions {

    private JSONParser jsonParser;

    private static String loginURL = "http://www.sampleweb.com/login.php";
    private static String registerURL = "http://www.sampleweb.com/register.php";

    private static String login_tag = "login";
    private static String register_tag = "register";

    // constructor
    public UserFunctions(){
        jsonParser = new JSONParser();
    }

    /**
     * function make Login Request
     * @param email
     * @param password
     * */
    public JSONObject loginUser(String email, String password){
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("tag", login_tag));
        params.add(new BasicNameValuePair("email", email));
        params.add(new BasicNameValuePair("password", password));
        JSONObject json = jsonParser.getJSONFromUrl(loginURL, params);
        // return json
        // Log.e("JSON", json.toString());
        return json;
    }

    /**
     * function make Login Request
     * @param name
     * @param email
     * @param password
     * */
    public JSONObject registerUser(String name, String email, String password){
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("tag", register_tag));
        params.add(new BasicNameValuePair("name", name));
        params.add(new BasicNameValuePair("email", email));
        params.add(new BasicNameValuePair("password", password));

        // getting JSON Object
        JSONObject json = jsonParser.getJSONFromUrl(registerURL, params);
        // return json
        return json;
    }

    /**
     * Function get Login status
     * */
    public boolean isUserLoggedIn(Context context){
        DatabaseHandler db = new DatabaseHandler(context);
        int count = db.getRowCount();
        if(count > 0){
            // user logged in
            return true;
        }
        return false;
    }

    /**
     * Function to logout user
     * Reset Database
     * */
    public boolean logoutUser(Context context){
        DatabaseHandler db = new DatabaseHandler(context);
        db.resetTables();
        return true;
    }

}
公共类用户函数{
私有JSONParser JSONParser;
专用静态字符串loginURL=”http://www.sampleweb.com/login.php";
专用静态字符串注册表URL=”http://www.sampleweb.com/register.php";
私有静态字符串login_tag=“login”;
专用静态字符串寄存器\u tag=“寄存器”;
//建造师
公共用户函数(){
jsonParser=新的jsonParser();
}
/**
*函数发出登录请求
*@param电子邮件
*@param密码
* */
公共JSONObject登录用户(字符串电子邮件、字符串密码){
//建筑参数
List params=new ArrayList();
添加(新的BasicNameValuePair(“标签”,登录标签));
参数添加(新的BasicNameValuePair(“电子邮件”),电子邮件);
添加(新的BasicNameValuePair(“密码”,password));
JSONObject json=jsonParser.getJSONFromUrl(loginURL,params);
//返回json
//Log.e(“JSON”,JSON.toString());
返回json;
}
/**
*函数发出登录请求
*@param name
*@param电子邮件
*@param密码
* */
公共JSONObject注册表服务器(字符串名称、字符串电子邮件、字符串密码){
//建筑参数
List params=new ArrayList();
参数添加(新的BasicNameValuePair(“标记”,寄存器_标记));
参数添加(新的BasicNameValuePair(“名称”),名称);
参数添加(新的BasicNameValuePair(“电子邮件”),电子邮件);
添加(新的BasicNameValuePair(“密码”,password));
//获取JSON对象
JSONObject json=jsonParser.getJSONFr