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在开发中常用properties文件来存储系统配置信息，下面就properties文件的读写，信息追加作简要介绍，顺便也解决乱码问题。
1、首先介绍一下properties类
properties类继承自Hashtable

package com.gmi.client.util;import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;/*** @author xiaoxin.tang**/
public class PropUtil {public static String readProperty(String file, String key) {InputStream is = null;FileInputStream fis = null;Properties prop = null;try {prop = new Properties();fis = new FileInputStream(file);is = new BufferedInputStream(fis);prop.load(is);String value = new String(prop.getProperty(key, "").getBytes("ISO-8859-1"), "UTF-8");return value;} catch (Exception e) {e.printStackTrace();return "";} finally {if (prop != null) prop = null;//fistry {if (fis != null) {fis.close();fis = null;}} catch (Exception e) {e.printStackTrace();}//istry {if (is != null) {is.close();is = null;}} catch (Exception e) {e.printStackTrace();}}}public static String readLocalProperty(String key) {String path = "";try {path = (PropUtil.class.getClassLoader().getResource("").toURI()).getPath();} catch (URISyntaxException e) {e.printStackTrace();}return readProperty(path + "conf.properties", key);}public static void writeProperty(String filename,String key,String value){FileInputStream fis = null;Properties properties = new Properties();try {fis = new FileInputStream(filename);BufferedReader bf = new BufferedReader(new InputStreamReader(fis,"UTF-8"));properties.load(bf);OutputStream out = new FileOutputStream(filename);BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(out,"UTF-8"));properties.setProperty(key, value);properties.store(bw, "propertylist");out.close();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}public static void writeLocalProperty(String key,String value){String path = "";try {path = (PropUtil.class.getClassLoader().getResource("").toURI()).getPath();} catch (URISyntaxException e) {e.printStackTrace();}writeProperty(path+"conf.properties", key, value);}public static List<Integer> parseNum2List(String numStr) {List<Integer> list = new ArrayList<Integer>();StringBuilder sb = null;int len = numStr.length();for (int i = 0;i < len;i++) {char ch = numStr.charAt(i);if (Character.isDigit(ch)) {if(null == sb){sb = new StringBuilder();}sb.append(ch);} else {if (null != sb) {list.add(Integer.parseInt(sb.toString()));sb = null;}}}// Add the last numif (null != sb) {list.add(Integer.parseInt(sb.toString()));}return list;}}

获取部署项目的properties文件路径：PropUtil.class.getClassLoader().getResource(“”).toURI()).getPath();
配置信息追加：首先把properties文件中原有的信息load出来，然后在store，这样就不存在清空原信息的问题了
fis = new FileInputStream(filename);
BufferedReader bf = new BufferedReader(new InputStreamReader(fis,”UTF-8”));
properties.load(bf);
解决中文乱码问题：由于采用字节流提取/写回信息，打开properties后发现乱码问题，把字节流转换成字符流，问题就迎刃而解了！