java读取properties的方法
在日常使用中经常会读取properties文件,现在把自己在网上搜集的一些java读取properties的方法汇总如下:
1、使用java.util.Properties类的load()方法
如:
- InputStream is = new BufferedInputStream(new FileInputStream(new File(properties文件所在路径));
- Properties properties = new Properties();
- properties.load(is);
2、使用java.util.ResourceBundle类的getBundle()方法
如:
- ResourceBundle rb = ResourceBundle.getBundle(name, Locale.getDefault());
3、使用java.util.PropertyResourceBundle类的构造函数
如:
- InputStream is = new BufferedInputStream(new FileInputStream(name));
- ResourceBundle rb = new PropertyResourceBundle(is);
4、使用class变量的getResourceAsStream()方法
如:
- InputStream in = 类名.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
如:
- InputStream in = 类名.class.getClassLoader().getResourceAsStream(name);
- Properties p = new Properties();
- p.load(in);
6、使用java.lang.ClassLoader类的getSystemResourceAsStream()静态方法
如:
- InputStream in = ClassLoader.getSystemResourceAsStream(name);
- Properties p = new Properties();
- p.load(in);
下面附上一些代码
ResourceBundleAdapter类:
- package com.dengsilinming.read.properties;
- import java.util.Enumeration;
- import java.util.Locale;
- import java.util.Properties;
- import java.util.PropertyResourceBundle;
- import java.util.ResourceBundle;
- /**
- * TODO Comment of ResourceBundleAdapter
- *
- * @author dengsilinming
- * @version $Id: ResourceBundleAdapter.java 2013-1-30 下午1:35:47 $
- */
- public class ResourceBundleAdapter extends Properties {
- /**
- *
- */
- private static final long serialVersionUID = 1L;
- public ResourceBundleAdapter(ResourceBundle rb) {
- assert (rb instanceof java.util.PropertyResourceBundle);
- this.rb = rb;
- Enumeration<String> 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);
- }
- }
OperateProperties类:
- package com.dengsilinming.read.properties;
- import java.io.BufferedInputStream;
- import java.io.FileInputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.util.Enumeration;
- import java.util.Locale;
- import java.util.Properties;
- import java.util.PropertyResourceBundle;
- import java.util.ResourceBundle;
- /**
- * TODO Comment of JProperties
- *
- * @author dengsilinming
- * @version $Id: JProperties.java 2013-1-30 下午1:34:32 $
- */
- public class OperateProperties {
- 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.ENGLISH);
- 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 (OperateProperties.class.equals(new OperateProperties().getClass()));
- in = OperateProperties.class.getResourceAsStream(name);
- assert (in != null);
- p.load(in);
- // return new JProperties().getClass().getResourceAsStream(name);
- } else if (type == BY_CLASSLOADER) {
- assert (OperateProperties.class.getClassLoader().equals(new OperateProperties().getClass().getClassLoader()));
- in = OperateProperties.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;
- }
- public static class ResourceBundleAdapter extends Properties {
- /**
- *
- */
- private static final long serialVersionUID = 1L;
- public ResourceBundleAdapter(ResourceBundle rb) {
- assert (rb instanceof java.util.PropertyResourceBundle);
- this.rb = rb;
- Enumeration<String> 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);
- }
- }
- }
PropertiesTest类:
- package com.dengsilinming.read.properties;
- import java.util.Properties;
- import junit.framework.TestCase;
- /**
- * TODO Comment of PropertiesTest
- *
- * @author dengsilinming
- * @version $Id: PropertiesTest.java 2013-1-30 下午1:40:52 $
- */
- public class PropertiesTest extends TestCase {
- OperateProperties jProperties;
- String key = "helloworld.title";
- String value = "Hello World!";
- public void testLoadProperties() throws Exception {
- String name = null;
- Properties p = new Properties();
- name = "F:/workspace/DailyPractise/src/com/dengsilinming/read/properties/localeProperties.properties";
- p = OperateProperties.loadProperties(name, OperateProperties.BY_PROPERTIES);
- assertEquals(value, p.getProperty(key));
- name = "com.dengsilinming.read.properties";
- p = OperateProperties.loadProperties(name, OperateProperties.BY_RESOURCEBUNDLE);
- assertEquals(value, p.getProperty(key));
- assertEquals(value, ((OperateProperties.ResourceBundleAdapter) p).getString(key));
- name = "F:/workspace/DailyPractise/src/com/dengsilinming/read/properties/localeProperties.properties";
- p = OperateProperties.loadProperties(name, OperateProperties.BY_PROPERTYRESOURCEBUNDLE);
- assertEquals(value, p.getProperty(key));
- assertEquals(value, ((OperateProperties.ResourceBundleAdapter) p).getString(key));
- name = "\\com\\dengsilinming\\read\\properties\\localeProperties.properties";
- p = OperateProperties.loadProperties(name, OperateProperties.BY_SYSTEM_CLASSLOADER);
- assertEquals(value, p.getProperty(key));
- name = "\\com\\dengsilinming\\read\\properties\\localeProperties.properties";
- p = OperateProperties.loadProperties(name, OperateProperties.BY_CLASSLOADER);
- assertEquals(value, p.getProperty(key));
- name = "\\properties\\localeProperties.properties";
- p = OperateProperties.loadProperties(name, OperateProperties.BY_CLASS);
- assertEquals(value, p.getProperty(key));
- }
- }
上面附上的代码在运行时是会报错的,大家自己去修改吧,都是一些很容易的问题,可不要偷懒哦
需要说明的一点是:这是我在网上看到的一篇文章,自己稍稍的改动过一些代码;由于当时没太注意文章的出处,所以在此对原作者表示抱歉

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