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());
ResourceBundle类是java自带的类,类路径:java.util.ResourceBundle,用来读取项目中后缀为properties的配置文件。
下面简单举例说明一下用法:
1. 数据准备
1)配置文件名称:application.properties(可将文件存放在工程的resource目录下,或者lib目录下)
2)配置文件内容:
dataBaseIp=127.0.0.1
user.name=root
user.password=123456
2. ResourceBundle类实现读取application.properties中key对应的value的步骤:
1)获取配置文件的名称,使用getBundle()方法
3. 在工程中调用步骤2中读取到的值即可,不赘述。
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);
完整的示例,可以参考附件文件
JProperties.java文件
import java.util.*; import java.io.InputStream; import java.io.IOException; import java.io.BufferedInputStream; import java.io.FileInputStream; 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; }
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