Java读取Properties文件的六种方法

　1。使用java.util.Properties类的load()方法

示例： InputStream in = lnew BufferedInputStream(new FileInputStream(name));

Properties p = new Properties();

p.load(in);

2。使用java.util.ResourceBundle类的getBundle()方法

示例： ResourceBundle rb = ResourceBundle.getBundle(name, Locale.getDefault());

3。使用java.util.PropertyResourceBundle类的构造函数

示例： InputStream in = new BufferedInputStream(new FileInputStream(name));

ResourceBundle rb = new PropertyResourceBundle(in);

4。使用class变量的getResourceAsStream()方法

示例： InputStream in = JProperties.class.getResourceAsStream(name);

Properties p = new Properties();

p.load(in);

5。使用class.getClassLoader()所得到的https://www.sodocs.net/doc/9612894539.html,ng.ClassLoader的getResourceAsStream()方法

示例： InputStream in = JProperties.class.getClassLoader().getResourceAsStream(name);

Properties p = new Properties();

p.load(in);

6。使用https://www.sodocs.net/doc/9612894539.html,ng.ClassLoader类的getSystemResourceAsStream()静态方法

示例： InputStream in = ClassLoader.getSystemResourceAsStream(name);

Properties p = new Properties();

p.load(in);

补充

Servlet中可以使用javax.servlet.ServletContext的getResourceAsStream()方法

示例：InputStream in = context.getResourceAsStream(path);

Properties p = new Properties();

p.load(in);

JProperties.java文件

public class JProperties {

public final static int BY_PROPERTIES = 1;

public final static int BY_RESOURCEBUNDLE = 2;

public final static int BY_PROPERTYRESOURCEBUNDLE = 3;

public final static int BY_CLASS = 4;

public final static int BY_CLASSLOADER = 5;

public final static int BY_SYSTEM_CLASSLOADER = 6;

public final static Properties loadProperties(final String name, final int type) throws IOException {

Properties p = new Properties();

InputStream in = null;

if (type == BY_PROPERTIES) {

in = new BufferedInputStream(new FileInputStream(name));

assert (in != null);

p.load(in);

} else if (type == BY_RESOURCEBUNDLE) {

ResourceBundle rb = ResourceBundle.getBundle(name, Locale.getDefault());

assert (rb != null);

p = new ResourceBundleAdapter(rb);

} else if (type == BY_PROPERTYRESOURCEBUNDLE) {

in = new BufferedInputStream(new FileInputStream(name));

assert (in != null);

ResourceBundle rb = new PropertyResourceBundle(in);

p = new ResourceBundleAdapter(rb);

} else if (type == BY_CLASS) {

assert (JProperties.class.equals(new JProperties().getClass()));

in = JProperties.class.getResourceAsStream(name);

assert (in != null);

p.load(in);

// return new JProperties().getClass().get

ResourceAsStream(name);

} else if (type == BY_CLASSLOADER) {

assert (JProperties.class.getClassLoader().equals(new JProperties().getClass().getClassLoader()));

in = JProperties.class.getClassLoader().getResourceAsStream(name);

assert (in != null);

p.load(in);

// return new JProperties().getClass().getClassLoader().getResourceAsStream(name);

} else if (type == BY_SYSTEM_CLASSLOADER) {

in = ClassLoader.getSystemResourceAsStream(name);

assert (in != null);

p.load(in);

}

if (in != null) {

in.close();

}

return p;

}

// ---------------------------------------------- servlet used

// ---------------------------------------------- support class

public static class ResourceBundleAdapter extends Properties {

public ResourceBundleAdapter(ResourceBundle rb) {

assert (rb instanceof java.util.PropertyResourceBundle);

this.rb = rb;

java.util.Enumeration e = rb.getKeys();

while (e.hasMoreElements()) {

Object o = e.nextElement();

this.put(o, rb.getObject((String) o));

}

}

private ResourceBundle rb = null;

public ResourceBundle getBundle(String baseName) {

return ResourceBundle.getBundle(baseName);

}

public ResourceBundle getBundle(String baseName, Locale locale) {

return ResourceBundle.getBundle(baseName, locale);

}

public ResourceBundle getBundle(String baseName, Locale locale, ClassLoader loader) {

return ResourceBundle.getBundle(baseName, locale, loader);

}