Properties文件读取工具类-PropertiesUtils

所需工具类：org.springframework.core-3.1.1.RELEASE.jar

代码：

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Properties;

import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.util.DefaultPropertiesPersister;
import org.springframework.util.PropertiesPersister;

/**
* Properties文件读取工具类.
*
* @author calvin
*/
public class PropertiesUtils {

private static final String DEFAULT_ENCODING = "UTF-8";

private static PropertiesPersister propertiesPersister = new DefaultPropertiesPersister();
private static ResourceLoader resourceLoader = new DefaultResourceLoader();

/**
* 载入多个properties文件, 相同的属性在最后载入的文件中的值将会覆盖之前的载入. 文件路径使用Spring Resource格式,
* 文件编码使用UTF-8.
*
* @see org.springframework.beans.factory.config.PropertyPlaceholderConfigurer
*/
public static Properties loadProperties(String... resourcesPaths)
throws IOException {
Properties props = new Properties();

for (String location : resourcesPaths) {

   InputStream is = null;
   try {
    Resource resource = resourceLoader.getResource(location);
    is = resource.getInputStream();
    propertiesPersister.load(props, new InputStreamReader(is,
      DEFAULT_ENCODING));
   } catch (IOException ex) {
    ex.printStackTrace();
   } finally {
    if (is != null) {
     is.close();
    }
   }
  }
  return props;
}

/**
*
* <p>
* Description:根据key值,从配置文件中读取相关配置信息<br />
* </p>
*
* @author gang.li
* @version 0.1 2012-12-6
* @param key
* @return String
*/
public static String getConfigByKey(String propertyName, String key) {
  Properties properties;
  String propertyValue = null;
  try {
   properties = PropertiesUtils.loadProperties(propertyName);
   // properties = PropertiesUtils.loadProperties("config.properties");
   propertyValue = properties.getProperty(key);
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  return propertyValue;
}

public static void main(String[] args) throws IOException {
  Properties properties = PropertiesUtils
    .loadProperties("config.properties");
  String bandingPath = properties.getProperty("BOOKING_PATH");
  System.out.println("BOOKING_PATH = " + bandingPath);

}

/**  
 * 获取整个配置文件中的属性 
 * @param filePath 文件路径，即文件所在包的路径，例如：java/util/config.properties  
 */    
public static Properties readData(String filePath) {    
    filePath = getRealPath(filePath);  
    Properties props = new Properties();
    try {    
        InputStream in = new BufferedInputStream(new FileInputStream(filePath));    
        props.load(in);    
        in.close();    
        return props;    
    } catch (Exception e) {    
        e.printStackTrace();    
        return null;    
    }    
}    
  
private static String getRealPath(String filePath) {  
    //获取绝对路径 并截掉路径的”file:/“前缀    
    return PropertiesConfig.class.getResource("/" + filePath).toString().substring(6);  
}

}

Properties文件读取工具类-PropertiesUtils

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