我是Android新手我希望在数据库中存储登录和注册详细信息我正在关注javatpoints教程但是我现在收到错误。我跟着很多教程然后同样的问题只有在任何一个是免费的帮助时我请。我想知道如何连接数据库以及如何存储以及如何从数据库中检索请帮我堆叠流量.......
public class MainActivity extends AppCompatActivity {
EditText password,userName;
Button login,resister;
ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
password=(EditText) findViewById(R.id.editText2);
userName=(EditText) findViewById(R.id.editText1);
login=(Button) findViewById(R.id.button1);
resister=(Button) findViewById(R.id.button2);
//progess_msz.setVisibility(View.GONE);
progressBar=(ProgressBar) findViewById(R.id.progressBar1);
progressBar.setVisibility(View.GONE);
resister.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent intent=new Intent(MainActivity.this,RegisterUserActivity.class);
startActivity(intent);
}
});
login.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
progressBar.setVisibility(View.VISIBLE);
String s1=userName.getText().toString();
String s2=password.getText().toString();
new ExecuteTask().execute(s1,s2);
}
});
}
class ExecuteTask extends AsyncTask<String, Integer, String>
{
@Override
protected String doInBackground(String... params) {
String res=PostData(params);
return res;
}
@Override
protected void onPostExecute(String result) {
progressBar.setVisibility(View.GONE);
//progess_msz.setVisibility(View.GONE);
Toast.makeText(getApplicationContext(), result, 3000).show();
}
}
public String PostData(String[] valuse) {
String s="";
try
{
HttpClient httpClient=new DefaultHttpClient();
HttpPost httpPost=new HttpPost("http://192.168.1.11/javatpoints/Login.php");
List<NameValuePair> list=new ArrayList<NameValuePair>();
list.add(new BasicNameValuePair("name", valuse[0]));
list.add(new BasicNameValuePair("pass",valuse[1]));
httpPost.setEntity(new UrlEncodedFormEntity(list));
HttpResponse httpResponse= httpClient.execute(httpPost);
HttpEntity httpEntity=httpResponse.getEntity();
s= readResponse(httpResponse);
}
catch(Exception exception) {}
return s;
}
public String readResponse(HttpResponse res) {
InputStream is=null;
String return_text="";
try {
is=res.getEntity().getContent();
BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(is));
String line="";
StringBuffer sb=new StringBuffer();
while ((line=bufferedReader.readLine())!=null)
{
sb.append(line);
}
return_text=sb.toString();
} catch (Exception e)
{
}
return return_text;
}
}
RegistreuserActivity.java
public class RegisterUserActivity extends Activity {
EditText userName,passwprd;
Button resister,login;
ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register_user);
userName=(EditText) findViewById(R.id.editText1);;
passwprd=(EditText) findViewById(R.id.editText2);
resister=(Button) findViewById(R.id.button1);
progressBar=(ProgressBar) findViewById(R.id.progressBar1);
progressBar.setVisibility(View.GONE);
resister.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
progressBar.setVisibility(View.VISIBLE);
String s1=userName.getText().toString();
String s2=passwprd.getText().toString();
new ExecuteTask().execute(s1,s2);
}
});
}
class ExecuteTask extends AsyncTask<String, Integer, String>
{
@Override
protected String doInBackground(String... params) {
PostData(params);
return null;
}
@Override
protected void onPostExecute(String result) {
progressBar.setVisibility(View.GONE);
}
}
public void PostData(String[] valuse) {
try
{
HttpClient httpClient=new DefaultHttpClient();
HttpPost httpPost=new HttpPost(
"http://192.168.1.11/javatpoints/registre.php");
List<NameValuePair> list=new ArrayList<NameValuePair>();
list.add(new BasicNameValuePair("name", valuse[0]));
list.add(new BasicNameValuePair("pass",valuse[1]));
httpPost.setEntity(new UrlEncodedFormEntity(list));
httpClient.execute(httpPost);
}
catch(Exception e)
{
System.out.println(e);
}
}
}
Login.java
public class Login extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
ObjectOutputStream out=new ObjectOutputStream(response.getOutputStream());
String n=request.getParameter("name");
String p=request.getParameter("pass");
System.out.println(n);
System.out.println(p);
if(validate(n, p)){
out.writeObject("success");
}
else{
out.writeObject("Sorry username or password error");
}
out.close();
}
public static boolean validate(String name,String pass){
boolean status=false;
try{
Class.forName("oracle.jdbc.driver.OracleDriver") Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","system", oracle");
PreparedStatement ps=con.prepareStatement( "select * from javatpoint_user where name=? and password=?");
ps.setString(1,name);
ps.setString(2,pass);
ResultSet rs=ps.executeQuery();
status=rs.next();
}catch(Exception e){System.out.println(e);}
return status;
}
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
httpPostServlet
public class httpPostServlet extends HttpServlet {
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
String recived_data="";
String s1=request.getParameter("name");
String s2=request.getParameter("pass");
System.out.println(s1);
System.out.println(s2);
try
{
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con=DriverManager.getConnection(
"jdbc:oracle:thin:@localhost:1521:xe","system","oracle");
PreparedStatement ps=con.prepareStatement(
"insert into javatpoint_user(name,password) values(?,?)");
ps.setString(1, s1);
ps.setString(2,s2);
ps.executeUpdate();
con.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
应该感谢任何帮助