获取properties文件

妖狐艹你老母 2022-05-22 13:27 232阅读 0赞

获取properties文件的信息

代码如下：

import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.Properties;
    
    /**
     * 读取配置文件信息工具类
     * 
     * @author 
     *
     */
    public class PropertiesUtil {
    
        /**
         * 获取某配置文件的值 带默认值
         * 
         * @param url
         *            properties文件名路劲
         * @param propName
         *            获取关键字
         * @param defaultValue
         *            默认值
         * @return
         * @throws FileNotFoundException
         * @throws IOException
         */
        public static String loadProperties(String url, String propName, String defaultValue)
                throws FileNotFoundException, IOException {
            Properties prop = new Properties();
            FileInputStream fis = null;
            try {
                fis = new FileInputStream(url);
                prop.load(fis);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (fis != null) {
                    try {
                        fis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            String returnValue = prop.getProperty(propName, defaultValue);
            return returnValue;
        }
    
        /**
         * 获取某配置文件的值 不带默认值
         * 
         * @param fileName
         *            配置文件名
         * @param key
         *            获取关键字
         * @return
         * @throws FileNotFoundException
         * @throws IOException
         */
        public static String getProperty(String fileName, String key) {
            Properties prop = new Properties();
            InputStream in = PropertiesUtil.class.getResourceAsStream("/" + fileName);
            System.out.println(in == null ? "in=null" : in.toString());
            try {
                prop.load(in);
                String value = prop.getProperty(key);
                return value;
            } catch (IOException e) {
                e.printStackTrace();
                return "false";
            } finally {
                if (in != null) {
                    try {
                        in.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
    
        }
    
        /**
         * 获取某配置文件的所有值
         * 
         * @param fileName
         *            配置文件名
         * @return
         * @throws FileNotFoundException
         * @throws IOException
         */
        public Properties getProperties(String fileName) {
            Properties prop = new Properties();
            InputStream in = PropertiesUtil.class.getResourceAsStream("/" + fileName);
            try {
                prop.load(in);
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (in != null) {
                    try {
                        in.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            return prop;
        }
    
        public static void main(String[] args) throws FileNotFoundException, IOException {
            System.out.println(PropertiesUtil.getProperty("ConstVar.properties", "FILE_UPLOAD_DIR"));
        }
    }

在src/main/resource/ConstVar.properties如图：

![70][]

运行结果：

![70 1][]

[70]: /images/20220522/fb2b954924ce465ca9e127d15e71514c.png
[70 1]: /images/20220522/771b520e058c40ffb68e816c12b39f0d.png