java加载properties文件的六种方法总结
java加载properties文件的六中基本方式实现
java加载properties文件的方式主要分为两大类：
》一种是通过import java.util.Properties类中的load(InputStream in)方法加载；
》另一种是通过import java.util.ResourceBundle类的getBundle(String baseName)方法加载。
注意：一定要区分路径格式
实现代码如下:
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | package com.util; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.util.Properties; import java.util.PropertyResourceBundle; import java.util.ResourceBundle; public class PropertiesUtil { private static String basePath = "src/prop.properties" ; private static String name = "" ; private static String nickname = "" ; private static String password = "" ; /** * 一、 使用java.util.Properties类的load(InputStream in)方法加载properties文件 * */ public static String getName1() { try { Properties prop = new Properties(); InputStream is = new FileInputStream(basePath); prop.load(is); name = prop.getProperty( "username" ); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return name; } /** * 二、 使用class变量的getResourceAsStream()方法 * 注意：getResourceAsStream()读取路径是与本类的同一包下 * */ public static String getName2() { Properties prop = new Properties(); InputStream is = PropertiesUtil. class .getResourceAsStream( "/com/util/prop.properties" ); try { prop.load(is); name = prop.getProperty( "username" ); } catch (IOException e) { e.printStackTrace(); } return name; } /** * 三、 * 使用class.getClassLoader()所得到的java.lang.ClassLoader的getResourceAsStream()方法 * getResourceAsStream(name)方法的参数必须是包路径+文件名+.后缀 否则会报空指针异常 * */ public static String getName3() { Properties prop = new Properties(); InputStream is = PropertiesUtil. class .getClassLoader() .getResourceAsStream( "com/util/prop.properties" ); try { prop.load(is); } catch (IOException e) { e.printStackTrace(); } return name; } /** * 四、 使用java.lang.ClassLoader类的getSystemResourceAsStream()静态方法 * getSystemResourceAsStream()方法的参数格式也是有固定要求的 * */ public static String getName4() { Properties prop = new Properties(); InputStream is = ClassLoader .getSystemResourceAsStream( "com/util/prop.properties" ); try { prop.load(is); name = prop.getProperty( "username" ); } catch (IOException e) { e.printStackTrace(); } return name; } /** * 五、 使用java.util.ResourceBundle类的getBundle()方法 * 注意：这个getBundle()方法的参数只能写成包路径+properties文件名，否则将抛异常 * */ public static String getName5() { ResourceBundle rb = ResourceBundle.getBundle( "com/util/prop" ); password = rb.getString( "password" ); return password; } /** * 六、 使用java.util.PropertyResourceBundle类的构造函数 * */ public static String getName6() { try { InputStream is = new FileInputStream(basePath); ResourceBundle rb = new PropertyResourceBundle(is); nickname = rb.getString( "nickname" ); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return nickname; } /** * 测试 * */ public static void main(String[] args) { System.out.println( "name1:" + PropertiesUtil.getName1()); System.out.println( "name2:" + PropertiesUtil.getName2()); System.out.println( "name3:" + PropertiesUtil.getName3()); System.out.println( "name4:" + PropertiesUtil.getName4()); System.out.println( "password:" + PropertiesUtil.getName5()); System.out.println( "nickname:" + PropertiesUtil.getName6()); } } |