通过变量连接android studio中的sql server

Question

如果我像这样使用 variavle，我会尝试连接到 android studio 中的 sqlserver：

String server ="192.168.1.2";
String database = "Db2020";
String user = "sa";
String password = "23457633";

它工作正常并且连接，当从这样的文件中读取变量时放置：

    ReadFile readFile=new ReadFile(fileEvents);
    server=readFile.servername;
    database=readFile.database;
    user=readFile.username;
    password=readFile.password;

它没有连接。 我没有办法？？？？？？

听听我的代码：

---

公共类 ReadFile {

String servername ,username,password,database;

public ReadFile (String fileEvents) {
    StringBuilder text = new StringBuilder();

    try {
        BufferedReader br = new BufferedReader(new FileReader(fileEvents));
        String line;

        while ((line = br.readLine()) != null) {
            text.append(line);
            text.append('\n');
        }
        br.close();
    } catch (
            IOException e) {
    }
    String result = text.toString();
    int xStart = 0, xOptin = 1;
    for (int xx = 0; xx != result.length(); xx = xx + 1) {
        if (result.substring(xx, xx + 1).equals("-")) {
            if (xOptin == 1) {
               servername = result.substring(xStart, xx -1);
            }
            if (xOptin == 2) {
                username = result.substring(xStart, xx-1);
            }
            if (xOptin == 3) {
                password = result.substring(xStart, xx-1);
            }
            if (xOptin == 4) {
                database = result.substring(xStart, xx-1);
            }
            xStart = xx + 2;
            xOptin++;
        }
    }
}

}

---

类连接类：

公共类连接类 {

@SuppressLint("NewApi")
String server ="192.168.1.2";
String database = "Db2020";
String user = "sa";
String password = "23457633";
public Connection Conn(String fileEvents){
    ReadFile readFile=new ReadFile(fileEvents);
    server=readFile.servername;
    database=readFile.database;
    user=readFile.username;
    password=readFile.password;

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

    Connection conn=null;
    String ConnectionURL =null;
    try {
        Class.forName("net.sourceforge.jtds.jdbc.Driver").newInstance();
        ConnectionURL = "jdbc:jtds:sqlserver://"+server+";databaseName="+database+";user="+user+";password="+password;
        conn= DriverManager.getConnection(ConnectionURL);
    }catch (SQLException se){

    }catch (ClassNotFoundException e){

    }catch (Exception e){}
    return conn;
}

}

---

公共类 SettingActivity 扩展 AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_setting);
    
    File fileEvents = new File( getFilesDir()+"/text/sample");

Connectionclass con = new Connectionclass();
conn = con.Conn(fileEvents.toString());
if (conn == null) {
    Toast.makeText(getApplicationContext(), "Connection Not Establish...", Toast.LENGTH_LONG).show();
} else {
    Toast.makeText(getApplicationContext(), " Connection Establish...", Toast.LENGTH_LONG).show();        
  }
}

}

Answer 1

把文件读成大字符串然后再解析好像没必要。

试试类似的东西

public ReadFile (String fileEvents) {
    BufferedReader br = new BufferedReader(new FileReader(fileEvents));
    servername = br.ReadLine();
    username = br.ReadLine();
    password = br.ReadLine();
    database = br.ReadLine();
    br.close();
}