h2SE API读取Properties文件的六种方法
发布时间:2007.07.10 06:25 来源:赛迪网 作者:dxaw |
使用J2SE API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java.lang.ClassLoader的getResourceAsStream()方法 示例: InputStream in = JProperties.class.getClassLoader().getResourceAsStream(name); Properties p = new Properties(); p.load(in); 6.使用java.lang.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); |
- 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;
- /**
- * 使用J2SE API?取Properties文件的六种方法
- * User: SYNFORM
- * Date: 2005/07/12
- * Time: 18:40:55
- * To change this template use File | Settings | File Templates.
- */
- 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().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);
- }
- if (in != null) {
- in.close();
- }
- return p;
- }
- // ---------------------------------------------- servlet used
- /*
- public static Properties loadProperties(
- ServletContext context, String path) throws IOException {
- assert (context != null);
- InputStream in = context.getResourceAsStream(path);
- assert (in != null);
- Properties p = new Properties();
- p.load(in);
- in.close();
- return p;
- }
- */
- // ---------------------------------------------- support class
- /**
- * ResourceBundle Adapter 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);
- }
- public Enumeration
getKeys() { - return rb.getKeys();
- }
- 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 String[] getStringArray(String key) {
- return rb.getStringArray(key);
- }
- protected Object handleGetObject(String key) {
- return ((PropertyResourceBundle) rb).handleGetObject(key);
- }
- }
- }
- package com.kindani.test;
- import junit.framework.*;
- import com.kindani.JProperties;
- //import javax.servlet.ServletContext;
- import java.util.Properties;
- 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();
- name = "C:\\IDEAP\\Properties4Methods\\src\\com\\
- kindani\\test\\LocalStrings.properties";
- p = JProperties.loadProperties(name, JProperties.BY_PROPERTIES);
- assertEquals(value, p.getProperty(key));
- name = "com.kindani.test.LocalStrings";
- p = JProperties.loadProperties(name,JProperties.BY_RESOURCEBUNDLE);
- assertEquals(value, p.getProperty(key));
- assertEquals(value,((JProperties.ResourceBundleAdapter)p).getString(key));
- name = "C:\\IDEAP\\Properties4Methods\\src\\com\\
- kindani\\test\\LocalStrings.properties";
- p = JProperties.loadProperties(name, JProperties.BY_PROPERTYRESOURCEBUNDLE);
- assertEquals(value, p.getProperty(key));
- assertEquals(value,((JProperties.ResourceBundleAdapter)p).getString(key));
- name = "\\com\\kindani\\test\\LocalStrings.properties";
- p = JProperties.loadProperties(name, JProperties.BY_SYSTEM_CLASSLOADER);
- assertEquals(value, p.getProperty(key));
- name = "\\com\\kindani\\test\\LocalStrings.properties";
- p = JProperties.loadProperties(name, JProperties.BY_CLASSLOADER);
- assertEquals(value, p.getProperty(key));
- name = "test\\LocalStrings.properties";
- p = JProperties.loadProperties(name, JProperties.BY_CLASS);
- assertEquals(value, p.getProperty(key));
- }
- /*
- public void testLoadProperties2() throws Exception {
- ServletContext context = null;
- String path = null;
- Properties p = null;
- path = "/WEB-INF/classes/LocalStrings.properties";
- p = JProperties.loadProperties(context, path);
- assertEquals(value, p.getProperty(key));
- }
- */
- }
properties文件与JPropertiesTest.java文件相同的目录下
LocalStrings.properties文件
- # $Id: LocalStrings.properties,v 1.1 2000/08/17 00:57:52 horwat Exp $
- # Default localized resources for example servlets
- # This locale is en_US
- helloworld.title=Hello World!
- requestinfo.title=Request Information Example
- requestinfo.label.method=Method:
- requestinfo.label.requesturi=Request URI:
- requestinfo.label.protocol=Protocol:
- requestinfo.label.pathinfo=Path Info:
- requestinfo.label.remoteaddr=Remote Address:
- requestheader.title=Request Header Example
- requestparams.title=Request Parameters Example
- requestparams.params-in-req=Parameters in this request:
- requestparams.no-params=No Parameters, Please enter some
- requestparams.firstname=First Name:
- requestparams.lastname=Last Name:
- cookies.title=Cookies Example
- cookies.cookies=Your browser is sending the following cookies:
- cookies.no-cookies=Your browser isn't sending any cookies
- cookies.make-cookie=Create a cookie to send to your browser
- cookies.name=Name:
- cookies.value=Value:
- cookies.set=You just sent the following cookie to your browser:
- sessions.title=Sessions Example
- sessions.id=Session ID:
- sessions.created=Created:
- sessions.lastaccessed=Last Accessed:
- sessions.data=The following data is in your session:
- sessions.adddata=Add data to your session
- sessions.dataname=Name of Session Attribute:
- sessions.datavalue=Value of Session Attribute: