Android讀寫properties配置文件

寫這篇文章之前可以成功運行,文章后就各種找不到文件.所以並沒有采用此種方式,后期完善.詳見下篇解決方案.

配置文件讀取很容易,修改需要注意權限,比如assets目錄下就不允許修改.

配置文件的創建:

New --- File

命名后選擇properties方式打開

配置文件設置

contrastIP = 192.166.1.65:8011

assets目錄創建

在main目錄下,與java res 目錄同級創建.

New --- Folder --- Assets Folder

assets目錄詳解: http://blog.csdn.net/chuntiandejiaobu10/article/details/52352128

權限配置

在 AndroidManifest.xml 中添加:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

其實我去掉后測試也可以成功運行.還是加上.預防萬一.

先讀配置:

方法一 讀取assets目錄下的配置

Properties props = new Properties();
props.load(context.getAssets().open(configName));

將configName文件從assets目錄下放出來,放在main目錄下:

方法二  會出現錯誤 open failed: ENOENT (No such file or directory) 然而並不知道目錄路徑該如何填

Properties props = new Properties();
props.load(new FileInputStream(configName));

方法三  這樣就能成功運行

Properties props = new Properties();
props.load(context.openFileInput(configName));

 

修改配置:

Properties props = new Properties();
props.load(context.openFileInput(configPath));
props.setProperty(keyName, keyValue);

// 讀取assets目錄下的,但是根本無法修改
// FileOutputStream out = context.getAssets().openFd(configPath).createOutputStream();

// 提示 open failed: EROFS (Read-only file system) 
// FileOutputStream out = new FileOutputStream(configPath);

// 這樣就可以了
FileOutputStream out = context.openFileOutput(configPath,Context.MODE_PRIVATE);

 

參考Context.MODE_PRIVATE說明: http://www.cnblogs.com/yjpjy/p/5407251.html

 

完整代碼

類

ProperTies 類

package com.lemon.demo.utils;
import android.content.Context;
 import android.util.Log;
import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.util.Properties;
public class ProperTies {
 //private static String configPath = getExternalStorageDirectory() + File.separator + "appConfig";
 private static String configPath = "appConfig";
</span><span style="color: #0000ff">public</span> <span style="color: #0000ff">static</span><span style="color: #000000"> Properties getProperties(Context context) {
    Log.e(</span>"configPath"<span style="color: #000000">, configPath);

    Properties urlProps;
    Properties props </span>= <span style="color: #0000ff">new</span><span style="color: #000000"> Properties();
    </span><span style="color: #0000ff">try</span><span style="color: #000000"> {
        </span><span style="color: #008000">//</span><span style="color: #008000">方法一：通過activity中的context攻取setting.properties的FileInputStream
        </span><span style="color: #008000">//</span><span style="color: #008000">注意這地方的參數appConfig在eclipse中應該是appConfig.properties才對,但在studio中不用寫后綴
        </span><span style="color: #008000">//</span><span style="color: #008000">InputStream in = c.getAssets().open("appConfig.properties");

        </span><span style="color: #008000">//</span><span style="color: #008000">props.load(context.getAssets().open(configName));

        </span><span style="color: #008000">//</span><span style="color: #008000">方法二：通過class獲取setting.properties的FileInputStream
        </span><span style="color: #008000">//</span><span style="color: #008000">InputStream in = PropertiesUtill.class.getResourceAsStream("/assets/  setting.properties "));

        </span><span style="color: #008000">//</span><span style="color: #008000"> 方法三</span>

 props.load(context.openFileInput(configPath));
 // props.load(new FileInputStream(configPath));
 
 } catch (Exception e1) {
 // TODO Auto-generated catch block
  e1.printStackTrace();
 }
    urlProps </span>=<span style="color: #000000"> props;
    </span><span style="color: #0000ff">return</span><span style="color: #000000"> urlProps;
}

</span><span style="color: #008000">//</span><span style="color: #008000">保存配置文件</span>
<span style="color: #0000ff">public</span> <span style="color: #0000ff">static</span><span style="color: #000000"> String setProperties(Context context, String keyName, String keyValue) {
    Properties props </span>= <span style="color: #0000ff">new</span><span style="color: #000000"> Properties();
    </span><span style="color: #0000ff">try</span><span style="color: #000000"> {
        props.load(context.openFileInput(configPath));
        props.setProperty(keyName, keyValue);
        </span><span style="color: #008000">//</span><span style="color: #008000"> FileOutputStream out = context.getAssets().openFd(configPath).createOutputStream();</span>
        FileOutputStream out =<span style="color: #000000"> context.openFileOutput(configPath,Context.MODE_PRIVATE);
        </span><span style="color: #008000">//</span><span style="color: #008000"> FileOutputStream out = new FileOutputStream(configPath);</span>
        props.store(out, <span style="color: #0000ff">null</span><span style="color: #000000">);

    } </span><span style="color: #0000ff">catch</span><span style="color: #000000"> (Exception e) {
        e.printStackTrace();
        Log.e(</span>"setPropertiesError"<span style="color: #000000">, e.toString());
        </span><span style="color: #0000ff">return</span> "修改配置文件失敗!"<span style="color: #000000">;
    }
    </span><span style="color: #0000ff">return</span> "設置成功"<span style="color: #000000">;
}

}

 

UrlString類:

package com.lemon.demo.json;
import android.content.Context;
 import com.lemon.demo.utils.ProperTies;
import java.util.Properties;
/**

    
    
   
   
           
 
            
讀寫配置屬性類
 */
 
           
public class UrlString {
<span style="color: #0000ff">private</span> String contrastIPName = "contrastIP"<span style="color: #000000">;

</span><span style="color: #008000">//</span><span style="color: #008000"> 上傳路徑</span>
<span style="color: #0000ff">private</span><span style="color: #000000"> String ip;
</span><span style="color: #0000ff">private</span><span style="color: #000000"> String ipAddress;

</span><span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> setIPAddress(Context context) {
    Properties proper </span>=<span style="color: #000000"> ProperTies.getProperties(context);
    </span><span style="color: #0000ff">this</span>.ip = proper.getProperty(contrastIPName, ""<span style="color: #000000">);
    </span><span style="color: #0000ff">this</span>.ipAddress = "http://" + <span style="color: #0000ff">this</span>.ip + "/index.html"<span style="color: #000000">;
}

</span><span style="color: #0000ff">public</span><span style="color: #000000"> String setIPAddress(Context context, String keyValue) {
    String result </span>=<span style="color: #000000"> ProperTies.setProperties(context, contrastIPName, keyValue);
    </span><span style="color: #0000ff">this</span>.ip =<span style="color: #000000"> keyValue;
    </span><span style="color: #0000ff">this</span>.ipAddress = "http://" + <span style="color: #0000ff">this</span>.ip + "/index.html"<span style="color: #000000">;
    </span><span style="color: #0000ff">return</span><span style="color: #000000"> result;
}

</span><span style="color: #0000ff">public</span><span style="color: #000000"> String getIP() {
    </span><span style="color: #0000ff">return</span> <span style="color: #0000ff">this</span><span style="color: #000000">.ip;
}

</span><span style="color: #0000ff">public</span><span style="color: #000000"> String getIPAddress() {
    </span><span style="color: #0000ff">return</span> <span style="color: #0000ff">this</span><span style="color: #000000">.ipAddress;
}

}

 

在activity中使用:

加載配置文件:

private UrlString urlString = new UrlString();
editText = (EditText) findViewById(R.id.et_ip);
 // 加載配置的信息 --- IP地址
 urlString.setIPAddress(this);
 editText.setText(urlString.getIP());

// 獲取完整地址
// urlString.getIPAddress()

修改配置文件:

String value = editText.getText().toString();
String result = urlString.setIPAddress(this,value);
tools.customToast(result, ConfigActivity.this);