0734w-月下竹音

用java從properties配置文件里面讀數(shù)據(jù)

第一步：配置文件
1. web.xml
<servlet>
    <servlet-name>InitServlet</servlet-name>
    <servlet-class>com.0734w.util.InitServlet</servlet-class>
    <init-param>
        <param-name>config</param-name>
        <param-value>/WEB-INF/config.properties</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
 
2.config.properties
假若在config.properties配置如下
app1.name=dog
app2.name=pig

3.在Constants.java中定義
public final static String APP1NAME = "app1.name";   
public final static String APP2NAME = "app2.name";   

第二步：定義InitServlet

package com.0734w.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.PropertyResourceBundle;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

import org.apache.log4j.Logger;


import com.cpic.adapter.adapterapp.constant.Constants;

/**
 * <p>Title：InitServlet.java</p>
 * <p>Description：當(dāng)應(yīng)用起動時加載要讀取的數(shù)據(jù)放入context中</p>
 * @author　spark 2005-12-26
 * @version　1.0
 */
public class InitServlet extends HttpServlet {
    private Logger logger;

    public void init() throws ServletException{
        super.init();
        ServletContext context = getServletContext();
        context.setAttribute(Constants.ADAPTER_INIT_STATUS,Boolean.FALSE);        
        //initialize proxy configuration
        initAdapter();
        context.setAttribute(Constants.ADAPTER_INIT_STATUS,Boolean.TRUE);
        logger.info("initAdapter initialized successfully");
    }

    
    /**
     * <p>Description：加載和設(shè)置數(shù)據(jù)</p>
     *  @throws ServletException
     *  spark 2005-12-26
     */
    private void initAdapter() throws ServletException{
        ServletContext context = getServletContext();
        String configFile = getInitParameter("config");
        if (configFile == null) {
            String errMsg="Initialize Adapter configuration  config file is not set in web.xml.";
            logger.error(errMsg);
            ServletException e = new ServletException(errMsg);
            throw e;            
        }
        
        InputStream in;
        PropertyResourceBundle configBundle;
        try {
            in = this.getServletContext().getResourceAsStream(configFile);
            configBundle = new PropertyResourceBundle(in);
          //需要讀取的數(shù)據(jù)每一個數(shù)據(jù)都要從這里 定義       context.setAttribute(Constants.APP1NAME,configBundle.getString(Constants.APP1NAME));
            context.setAttribute(Constants.APP2NAME,configBundle.getString(Constants..APP2NAME));

        } catch (IOException e) {
            String errMsg = "Initialize adapter config.properties failed.";
            logger.error(errMsg);
            ServletException e1 = new ServletException(errMsg);
            throw e1;            
        }
         catch (Exception e) {
            String errMsg = "Initialize adapter config.properties failed.";
            logger.error(errMsg);
            ServletException e1 = new ServletException(errMsg);
            throw e1;            
        }
        
    }
    
}

第三步，在應(yīng)用利用：
在servlet中如下：
ServletContext context = getServletContext();
（ String) context.getAttribute(Constants.APP1NAME)
在STRUTS的ACTION中如下：
ServletContext context = request.getSession().getServletContext();
(String) context.getAttribute(Constants.APP1NAME);

posted on 2006-01-18 16:46 sparkwu 閱讀(825) 評論(0)  編輯  收藏