Web项目Java读取Properties文件出现“The system cannot find the file specified”解决

向右看齐 2022-03-19 07:24 1578阅读 0赞

### 环境 ###

MyEclipse 8.6 + JDK 1.6.31

### 问题 ###

控制台测试读取配置文件正常，但部署到Tomcat后，再次读取，出现如下错误：

The system cannot find the file specified

### 解决 ###

首先请读者参考控制台可以正常读取的代码：

package com.axt.sms.util;
    
    import java.io.BufferedInputStream;
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.Properties;
    /**
     * 
     * @version 1.0
     * @since JDK 1.6
     */
    public class PropertiesConfig {  
    	  
        /** 
         */  
        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;  
            }  
        }  
        
        public static Properties readDBData(){
        	Properties props = new Properties();
        	try {
    			props.load(new FileInputStream("db.properties").getClass().getResourceAsStream("db.properties"));
    		} catch (FileNotFoundException e) {
    			e.printStackTrace();
    		} catch (IOException e) {
    			e.printStackTrace();
    		}
        	return props;
        }
        private static String getRealPath(String filePath) {
        	return PropertiesConfig.class.getResource("/" + filePath).toString().substring(6);
        }
    }

再次看改进后的代码：

package com.axt.sms.util;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.UnsupportedEncodingException;
    import java.util.Properties;
    
    public class PropertiesUtil {
    	private InputStream inputStream;
    	private Properties properties;
    	
    	public PropertiesUtil(String fileName) {
    		inputStream = this.getClass().getClassLoader().getResourceAsStream(fileName);    
    		properties = new Properties();  
    	}
    		
    	/**
    	 * 获得签名
    	 * @return
    	 * @throws UnsupportedEncodingException
    	 */
    	public String getSignature() throws UnsupportedEncodingException{
    		try {    
    			properties.load(inputStream);    
    		} catch (IOException e1) {    
    			e1.printStackTrace();    
    		} 
    		return new String(properties.getProperty("signature").getBytes("ISO-8859-1"), "UTF-8");
    	}
    		
    	public static void main(String[] args) {
    		try {
    			System.out.println(new PropertiesUtil("sms.properties").getSignature());
    		} catch (UnsupportedEncodingException e) {
    			e.printStackTrace();
    		}
    	}
    }

### 总结 ###

部署到Tomcat服务器后，应该采取绝对路径。因部署到服务器后，目录路径是动态变化的，应该使用getResourceAsStream方法。

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