1)加载全局配置文件类
package com.magnus.core.servlet;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import org.springside.modules.utils.SystemGlobals;
/**
* 主要用于加载全局配置文件的类
*
*
*/
public class ConfigServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private final static Logger log = Logger.getLogger(ConfigServlet.class);
/**
* Constructor of the object.
*/
public ConfigServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException
* if an error occure
*/
public void init() throws ServletException {
try {
// ConfigConstant.initConfigConstant(getServletContext().getRealPath("/"));
load();
log.info("Init config.......ok");
log.info(SystemGlobals.dump());
} catch (Exception e) {
log.error(e);
throw new ServletException("Init config Fail:" + e.getMessage());
}
String filePath = SystemGlobals.getValue("filepath");
// 其他必要操作。。。
}
public void doPost(HttpServletRequest request, HttpServletResponse response) {
try {
load();
log.info("Reload config.......ok");
log.info(SystemGlobals.dump());
// 清空缓存
WebApplicationContext webApplicationContext = WebApplicationContextUtils
.getRequiredWebApplicationContext(getServletContext());
PrintWriter out = response.getWriter();
out.print("{success:true}");
out.flush();
out.close();
} catch (Exception e) {
log.error("reload config Fail:" + e.getMessage());
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response) {
doPost(request, response);
}
private void load() throws IOException {
String configFile = this.getServletConfig().getInitParameter("configFile");
SystemGlobals.loadConfig(this.getServletContext().getRealPath(configFile));
}
}
2) 提供全局配置文件访问入口
package org.springside.modules.utils;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;
import org.apache.log4j.Logger;
/**
* 单件，提供全局配置文件访问入口
*/
public class SystemGlobals {
private final static Logger log = Logger.getLogger(SystemGlobals.class);
private static SystemGlobals globals = new SystemGlobals();
private Properties config = new Properties();
private SystemGlobals(){}
/**
* 静态加载配置文件
* @param appPath 文件路径
* @throws IOException
*/
public static void loadConfig(String appPath) throws IOException
{
globals = new SystemGlobals();
FileInputStream input = new FileInputStream(appPath);
globals.config.load(input);
input.close();
}
/**
* 取得与key值相对应的字符串value
* @param key
* @return 字符串value
*/
public static String getValue(String key){
return globals.config.getProperty(key);
}
/**
* 取得与key值相对应的int类型的value
* @param key
* @return int类型的值
*/
public static int getIntValue(String key){
return Integer.parseInt(globals.config.getProperty(key).trim());
}
public static String dump(){
return globals.config.toString();
}
}