读取修改配置文件

来源：互联网发布：arin whois 数据库编辑：程序博客网时间：2024/04/29 18:42
ResourceBundle
PropertiesUtil.class.getClassLoader().getResource
PropertiesLoaderUtils.loadProperties(new ClassPathResource(propertyName));
package com.ffcs.aaa.utils;import java.io.BufferedWriter;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStreamWriter;import java.net.URLDecoder;import java.util.ArrayList;import java.util.Enumeration;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Properties;import java.util.ResourceBundle;import org.apache.log4j.Logger;import org.springframework.core.io.ClassPathResource;import org.springframework.core.io.support.PropertiesLoaderUtils;public class PropertiesUtil {static Logger log = Logger.getLogger("smsTaskLog");/** * 获取指定配置文件中所以的数据 *  * @param propertyName *            调用方式： 1.配置文件放在resource源包下，不用加后缀 *            PropertiesUtil.loadWarningMessage("warn_message"); 2.放在包里面的 *            PropertiesUtil.loadWarningMessage("com.test.message"); * @return */public static Map<String, String> loadProperties(String propertyName) {// 获得资源包ResourceBundle rb=null;try {rb = ResourceBundle.getBundle(propertyName.trim());} catch (Exception e) {log.error(e.getMessage()); }// 通过资源包拿到所有的keyEnumeration<String> allKey = rb.getKeys();// 遍历key 得到 valueMap<String, String> messageMap=new HashMap<String, String>();while (allKey.hasMoreElements()) {String key = allKey.nextElement();String value = (String) rb.getString(key);messageMap.put(key, value);}return messageMap;}/** * 传递键值对的Map，更新properties文件 *  * @param fileName  *            文件名(放在resource源包目录下)，需要后缀 warn_message.properties * @param keyValueMap *            键值对Map */public static void updateProperties(String fileName,Map<String, String> keyValueMap) {//getResource方法使用了utf-8对路径信息进行了编码，当路径中存在中文和空格时，他会对这些字符进行转换，这样，//得到的往往不是我们想要的真实路径，在此，调用了URLDecoder的decode方法进行解码，以便得到原始的中文及空格路径。String filePath = PropertiesUtil.class.getClassLoader().getResource(fileName).getFile();Properties props = null;BufferedWriter bw = null;try {filePath = URLDecoder.decode(filePath,"utf-8");    log.debug("updateProperties propertiesPath:" + filePath);props = PropertiesLoaderUtils.loadProperties(new ClassPathResource(fileName));//log.debug("updateProperties old:"+props);// 写入属性文件bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filePath)));props.clear();// 清空旧的文件for (String key : keyValueMap.keySet())props.setProperty(key, keyValueMap.get(key));log.debug("updateProperties new:"+props);props.store(bw, "");} catch (IOException e) {log.error(e.getMessage());} finally {try {bw.close();} catch (IOException e) {e.printStackTrace();}}}/** * 判断指定配置文件中是否存在该项 Spring 提供的 PropertiesLoaderUtils 允许您直接通过基于类路径的文件地址加载属性资源 * 最大的好处就是：实时加载配置文件，修改后立即生效，不必重启 *  * @param propertyName *            要加上后缀：warn_message.properties * @param key * @return true:false */public static boolean containKey(String propertyName, String key) {Properties props = null;try {props = PropertiesLoaderUtils.loadProperties(new ClassPathResource(propertyName));} catch (IOException e) {log.error(e.getMessage());}log.debug("props content:"+props);return props.containsKey(key);}private  void test() {List<String> l = new ArrayList<String>();l.add("192.168.14.63");l.add("192.168.14.62");l.add("192.168.14.61");Map<String, String> map = new HashMap<String, String>();for (String key : l) {boolean containKey = PropertiesUtil.containKey("warn_message.properties", key);log.debug(key+":"+containKey);map.put(key, "");}PropertiesUtil.updateProperties("message.properties", map);System.out.println("================================================");for (String key : l) {boolean containKey = PropertiesUtil.containKey("warn_message.properties", key);log.debug(key+":"+containKey);map.put(key, "");}}public static void main(String[] args) {loadProperties("a");}}
0 0