Properties类加载properties文件和xml文件

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)

****************************************************************************************************************************************************************

测试的properties文件：

#格式良好的properties文件
aaa=111
bbb=222

 

测试类：

package stu;

import java.io.*;
import java.util.Properties;

/**
* Properties类测试
* User: xiaohui
* Date: 2008-11-4 21:04:54
*/
public class TestProperties {
        public static void main(String args[]) throws IOException {
                testProperties();
                test1();
        }

        public static void testProperties() throws IOException {
                System.out.println("------------testProperties-------------");
                //将properties文件加载到输入字节流中
                InputStream is = new FileInputStream("D:\\myprojects\\lession4\\src\\stu\\ttt.properties");
                //创建一个Properties容器
                Properties prop = new Properties();
                //从流中加载properties文件信息
                prop.load(is);
                //循环输出配置信息
                for (Object key : prop.keySet()) {
                        System.out.println(key + "=" + prop.get(key));
                }

                //定义一个输出流
                OutputStream os1 = new FileOutputStream("C:\\ttt.xml");
                OutputStream os2 = new FileOutputStream("C:\\ttt.properties");

                //从Properties对象导出导出到xml
                prop.storeToXML(os1, "我从properties导出的XML配置文件");
                //从Properties对象导出properties文件
                prop.store(os2, "我从properties导出的XML配置文件");

                is.close();
                os1.close();
                os2.close();

                //从xml加载配置信息，填充Properties容器
                prop.loadFromXML(new FileInputStream("C:\\ttt.xml"));
                //循环输出配置信息
                System.out.println("我从导出的xml加载配置文件信息！");
                for (Object key : prop.keySet()) {
                        System.out.println(key + "=" + prop.get(key));
                }

                //修改Properties对象，并持久化到一个文件
                prop.put("呵呵呵", "嘎嘎嘎");
                OutputStream os3 = new FileOutputStream("C:\\ttt1.xml");
                prop.storeToXML(os3, "我从properties导出的XML配置文件");
                os3.close();
        }

        /**
         * 以相对路径方式加载properties文件
         *
         * @throws IOException
         */
        public static void test1() throws IOException {
                System.out.println("------------test1-------------");
                Properties p = new Properties();
                p.load(TestProperties.class.getResourceAsStream("/stu/ttt.properties"));
                for (Object key : p.keySet()) {
                        System.out.println(key + "=" + p.get(key));
                }
        }
}

运行结果：

------------testProperties-------------
bbb=222
aaa=111
我从导出的xml加载配置文件信息！
bbb=222
aaa=111
------------test1-------------
bbb=222
aaa=111

Process finished with exit code 0