package com.hxzkoa.util;
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import java.io.BufferedInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.util.Properties;
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public class ModifyConfig {
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/**
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* 根据KEY，读取文件对应的值
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* @param filePath 文件路径，即文件所在包的路径，例如：java/util/config.properties
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* @param key 键
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* @return key对应的值
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*/
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public static String readData(String filePath, String key) {
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//获取绝对路径
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// filePath = PropertiesConfig.class.getResource("/" + filePath).toString();
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// filePath = PropertiesConfig.class.getResource("/" + filePath).toString();
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//截掉路径的”file:“前缀
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// filePath = filePath.substring(6);
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Properties props = new Properties();
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try {
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InputStream in = new BufferedInputStream(new FileInputStream(filePath));
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props.load(in);
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in.close();
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String value = props.getProperty(key);
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return value;
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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}
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/**
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* 修改或添加键值对 如果key存在，修改, 反之，添加。
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* @param filePath 文件路径，即文件所在包的路径，例如：java/util/config.properties
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* @param key 键
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* @param value 键对应的值
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*/
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public static void writeData(String filePath, String key, String value) {
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//获取绝对路径
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// filePath = PropertiesConfig.class.getResource("/" + filePath).toString();
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//截掉路径的”file:/“前缀
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// filePath = filePath.substring(6);
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Properties prop = new Properties();
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try {
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File file = new File(filePath);
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if (!file.exists())
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file.createNewFile();
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InputStream fis = new FileInputStream(file);
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prop.load(fis);
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//一定要在修改值之前关闭fis
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fis.close();
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OutputStream fos = new FileOutputStream(filePath);
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prop.setProperty(key, value);
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//保存，并加入注释
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prop.store(fos, "Update '" + key + "' value");
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fos.close();
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} catch (IOException e) {
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System.err.println("Visit " + filePath + " for updating " + value + " value error");
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}
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}
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public static void main(String[] args) {
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String fileName = Config.getBaowenConfig();
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System.out.println(ModifyConfig.readData(fileName, "server.port"));
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ModifyConfig.writeData(fileName, "server.port", "12345");
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}
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}
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