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Java读取.properties
配置文件的几种方法
在做java工程时，
经常会将一些配置信息放到
.properties
文件中，
需要用时再去对应的文件中
读取，下面提供几种常用的读取
.properties
文件的方法，并列举这些方法的特点。
一、读文件方式读取
.properties
文件。
关键代码如下：
try{
// 创建Properties对象
Properties p = new Properties();
// 设置读取文件路径
String s_xmlpath="config.properties";
InputStream io=Test.class.getClassLoader().getResourceAsStream(s_xmlpath);
// 加载文件
p.oad(io);
// 取得文件的值
system.out.println(p.getProperty("key"));
// 关闭流
io.close();
}catch(Exception ex){
ex.printStackTrace();
}
该方法可放到
Servlet
中，在工程初期化时一次性加载配置文件，具体代码如下：
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Properties;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Test extends HttpServlet {
public static Properties p;
private static Test instance = null;
/**
* Constructor of the object.
* 默认构造方法
*/
public Test() {
super();
}
/**
* Constructor of the object.
* 私有构造方法，调用
init()
方法读取配置文件
*/
private Test(String str) {
super();
try {
this.init();
} catch (ServletException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 静态方法，取得对象实例
* @return
*/
public static Test getInstance()
{
// 当前实例为空时
if(instance == null)
{
instance = new Test("");
}
return instance;
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
* This method is called when a form has its tag value method equals to get.
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
……
}
/**
* The doPost method of the servlet. <br>
* This method is called when a form has its tag value method equals to post.
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
……
}
/**
* Initialization of the servlet. <br>
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
try{
// 创建Properties对象
p = new Properties();
// 设置读取文件路径
String s_xmlpath="sql.properties";
InputStream io=Test.class.getClassLoader().getResourceAsStream(s_xmlpath);
//调用里面的信息
}