package com.javacui.lucene.jdbc;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.Properties;
import org.apache.log4j.Logger;
public class PropertieUtil {
 private static Logger logger = Logger.getLogger(PropertieUtil.class);
 private PropertieUtil() {
 }
 /**
  * 读取配置文件某属性
  */
 public static String readValue(String filePath, String key) {
  Properties props = new Properties();
  try {
   // 注意路径以 / 开始，没有则处理
   if (!filePath.startsWith("/"))
    filePath = "/" + filePath;
   InputStream in = PropertieUtil.class.getResourceAsStream(filePath);
   props.load(in);
   String value = props.getProperty(key);
   return value;
  } catch (Exception e) {
   logger.error(e);
   return null;
  }
 }
 /**
  * 打印配置文件全部内容（filePath，配置文件名，如果有路径，props/test.properties）
  */
 public static void readProperties(String filePath) {
  Properties props = new Properties();
  try {
   // 注意路径以 / 开始，没有则处理
   if (!filePath.startsWith("/"))
    filePath = "/" + filePath;
   InputStream in = PropertieUtil.class.getResourceAsStream(filePath);
   props.load(in);
   Enumeration<?> en = props.propertyNames();
   // 遍历打印
   while (en.hasMoreElements()) {
    String key = (String) en.nextElement();
    String Property = props.getProperty(key);
    logger.info(key + ":" + Property);
   }
  } catch (Exception e) {
   logger.error(e);
  }
 }
 /**
  * 将值写入配置文件
  */
 public static void writeProperties(String fileName, String parameterName, String parameterValue) throws Exception {
  // 本地测试特别注意，如果是maven项目，请到\target目录下查看文件，而不是源代码下
  // 注意路径不能加 / 了，加了则移除掉
  if (fileName.startsWith("/"))
   fileName.substring(1);
  String filePath = PropertieUtil.class.getResource("/").getPath()+fileName;
  // 获取配置文件
  Properties pps = new Properties();
  InputStream in = new BufferedInputStream(new FileInputStream(filePath));
  pps.load(in);
  in.close();
  OutputStream out = new FileOutputStream(filePath);
  // 设置配置名称和值
  pps.setProperty(parameterName, parameterValue);
  // comments 等于配置文件的注释
  pps.store(out, "Update " + parameterName + " name");
  out.flush();
  out.close();
 }
 public static void main(String[] args) throws Exception {
  readProperties("jdbc.properties");
//  logger.info(readValue("jdbc.properties", "JAVABLOG_WRITE_URL"));
//  writeProperties("test.properties", "test", "test");
 }
}