Properties文件读取工具类-PropertiesUtils

淩亂°似流年 2022-05-21 08:00 484阅读 0赞

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);  
    }