Properties文件解析-蒲公英云

Properties文件解析

package com.winskysoft.bbk.tools;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServlet;
/**
 * 读取配置文件
 *
 */
public class PropertiesUtil {
    private String filename;
    private Properties p;
    private FileInputStream in;
    private FileOutputStream out;
    public PropertiesUtil(String filename) {
        this.filename = filename;
        File file = new File(filename);
        try {
            in = new FileInputStream(file);
            p = new Properties();
            p.load(in);
            in.close();
        } catch (FileNotFoundException e) {
            System.err.println("配置文件config.properties找不到！");
            e.printStackTrace();
        } catch (IOException e) {
            System.err.println("读取配置文件config.properties错误！");
            e.printStackTrace();
        }
    }
    public PropertiesUtil(InputStream in){
        try {
            p = new Properties();
            p.load(in);
        } catch (IOException e) {
            System.err.println("读取配置文件config.properties错误！");
            e.printStackTrace();
        }
    }
    public static String getConfigFile(HttpServlet hs) {
        return getConfigFile(hs, "config.properties");
    }
    private static String getConfigFile(HttpServlet hs, String configFileName) {
        String configFile = "";
        ServletContext sc = hs.getServletContext();
        configFile = sc.getRealPath("/" + configFileName);
        if (configFile == null || configFile.equals("")) {
            configFile = "/" + configFileName;
        }
        return configFile;
    }
    public void list() {
        p.list(System.out);
    }
    public String getValue(String itemName) {
        return p.getProperty(itemName);
    }
    public String getValue(String itemName, String defaultValue) {
        return p.getProperty(itemName, defaultValue);
    }
    public void setValue(String itemName, String value) {
        p.setProperty(itemName, value);
    }
    public void saveFile(String filename, String description) throws Exception {
        try {
            File f = new File(filename);
            out = new FileOutputStream(f);
            p.store(out, description);
            out.close();
        } catch (IOException ex) {
            throw new Exception("无法保存指定的配置文件:" + filename);
        }
    }
    public void saveFile(String filename) throws Exception {
        saveFile(filename, "");
    }
    public void saveFile() throws Exception {
        if (filename.length() == 0)
            throw new Exception("需指定保存的配置文件名");
        saveFile(filename);
    }
    public void deleteValue(String value) {
        p.remove(value);
    }
}