java properties 文件读写工具类

电玩女神 2022-06-06 14:09 206阅读 0赞

package com.design.utils;
    
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.util.Properties;
    
    /** * 配置文件工具类 * @author zhangtengda * */
    public class PropertiesUtils { 
        private String filePath;
    
        public PropertiesUtils(String filePath) {
            super();
            this.filePath = filePath;
        }
        /** * 获取key对应的值 * @param key * @return */
        public Object getProperty(String key) {
            Properties pro = new Properties();
            FileInputStream in = null;
            try {
                in = new FileInputStream(filePath);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            try {
                pro.load(in);
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return pro.get(key);
        }
    
    
        /** * 更新键值对，有就更新，没有就新增 * @param key * @param value */
        public void setProperty(String key, Object value) {
            // 1.读取原来的数据
            Properties pro = new Properties();
            FileInputStream in = null;
            try {
                File f = new File(filePath);
                if(!f.exists()) {
                    try {
                        f.createNewFile();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                in = new FileInputStream(filePath);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            try {
                pro.load(in);
            } catch (IOException e1) {
                e1.printStackTrace();
            } finally {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            FileOutputStream out = null;
            try {
                out = new FileOutputStream(filePath);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            // 2.更新数据
            pro.setProperty(key, (String) value);
            try {
                pro.store(out, null);
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    
        public static void main(String[] args) {
            String filePath = PropertiesUtils.class.getResource("").getPath() + "\\a.properties";
            PropertiesUtils property = new PropertiesUtils(filePath);
            // 读取属性
            property.setProperty("age", "20");
            System.out.println(property.getProperty("age"));
            property.setProperty("name", "dadadd");
    
        } 
    
    }