-、 放在res中的properties文件的读取,例如对放在assets目录中的setting.properties的读取:
PS:之所以这里只是有读取操作,而没有写的操作,是因为我发现不能对res下的资源文件进行操作,当然包括assets下的properties文件了。如对res资源目录下的properties进行写的操作,那么在你获得properties的FileOutputStream的实例时会报FileNotFoundException的异常。
代码如下(操作写成一个PropertiesUtil工具类):
setting.properties中的代码:
url=http://localhost:8080
PropertiesUtil 工具类:
public class PropertiesUtil {
private static Properties urlProps;
public static Properties getProperties(Context c){
Properties props = new Properties();
try {
//方法一:通过activity中的context攻取setting.properties的FileInputStream
//方法一:通过activity中的context攻取setting.properties的FileInputStream
InputStream in = c.getAssets().open(" setting.properties ");
//方法二:通过class获取setting.properties的FileInputStream
//InputStream in = PropertiesUtill.class.getResourceAsStream("/assets/ setting.properties "));
//方法二:通过class获取setting.properties的FileInputStream
//InputStream in = PropertiesUtill.class.getResourceAsStream("/assets/ setting.properties "));
props.load(in);
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
urlProps = props;
//测试是否能获得setting.properties中url的值
System.out.println(urlProps.getProperty("url"));
return urlProps;
//测试是否能获得setting.properties中url的值
System.out.println(urlProps.getProperty("url"));
return urlProps;
}
}
二、对不是放在res资源目录下的properties文件的操作,如放在activity 的 包(package)目录下的setting.properties文件的读写操作。
setting.properties的代码还是一样的,只是路径不同,而是在activity的包(如:com.jansun.activity)目录下:
setting.properties的代码还是一样的,只是路径不同,而是在activity的包(如:com.jansun.activity)目录下:
url=http://localhost:8080
PropertiesUtil工具类:
public class PropertiesUtil {
private static Properties urlProps;
private static final path = "/data/data/com.jansun.activity/setting.properties";
//private FileUtils fu = new FileUtils();
public static Properties getProperties(){
Properties props = new Properties();
try {
InputStream in = new FileInputStream(getSettingFile());
props.load(in);
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
urlProps = props;
return urlProps;
}
public static void setProperties( String param, String value ){
Properties props = new Properties();
try {
props.load(new FileInputStream( getSettingFile() ));
OutputStream out = new FileOutputStream(FileUtils.setting);
Enumeration<?> e = props.propertyNames();
if(e.hasMoreElements()){
while(e.hasMoreElements()){
String s = (String)e.nextElement();
if(!s.equals(param))
props.setProperty(s, props.getProperty(s));
}
}
props.setProperty(param, value);
props.store(out, null);
//测试是否能够打印出最新的,刚刚修改的url的值
//测试是否能够打印出最新的,刚刚修改的url的值
//System.out.println("setProperty success: " + props.getProperty(param));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private static File getSettingFile(){
File setting = new File(path);
if(!setting.exists()) setting.createNewFile();
return setting;
}
File setting = new File(path);
if(!setting.exists()) setting.createNewFile();
return setting;
}
}