java加载properties文件的六种方法总结

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:

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 = "";

  
  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;
  }

  
  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;
  }

  
  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;
  }

  
  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;
  }

  
  public static String getName5() {
    ResourceBundle rb = ResourceBundle.getBundle("com/util/prop");
    password = rb.getString("password");
    return password;
  }

  
  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;
  }

  
  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());
  }
}

 文件路径：

prop.properties文件：

1 username=mamama
2 nickname=xiaoma
3 password=123456

输出结果：

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