Java加载properties文件的六种方法

p.load(in);
完整的示例，可以参考附件文件 如何上传文件，谁知道请告诉以下。 只好把 source 都贴上来了 JProperties.java 文件
package com.kindani;
//import javax.servlet.ServletContext; import java.util.*; import java.io.InputStream; import java.io.IOException; import java.io.BufferedInputStream; import java.io.FileInputStream;
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 class JPropertiesTest extends TestCase { JProperties jProperties; String key = "helloworld.title"; String value = "Hello World!";
public void testLoadProperties() throws Exception { String name = null; Properties p = new Properties();
if (in != null) {
in.close(); } return p;
}
// ---------------------------------------------- servlet used
// ---------------------------------------------- support class
}
}
JPropertiesTest.java 文件
package com.kindani.test;
import junit.framework.*; import com.kindani.JProperties;
//import javax.servlet.ServletContext; import java.util.Properties;
public String[] getStringArray(String key) { return rb.getStringArray(key); }
protected Object handleGetObject(String key) { return ((PropertyResourceBundle) rb).handleGetObject(key); }
public ResourceBundle getBundle(String baseName, Locale locale, ClassLoader loader) { return ResourceBundle.getBundle(baseName, locale, loader); }
public Enumeration getKeys() { return rb.getKeys(); }
6。使用 ng.ClassLoader 类的 getSystemResourceAsStream()静态方 法 示例：InputStream in = ClassLoader.getSystemResourceAsStream(name); Properties p = new Properties(); p.load(in);
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);
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);
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().getResourceAsStream(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); }
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();
public Locale getLocale() { return rb.getLocale();
}
public Object getObject(String key) { return rb.getObject(key); }
public String getString(String key) { return rb.getString(key); }
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来自CLASSLOADER = 6;
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)); } }