java web讀配置檔案_javaweb配置檔案的讀取（Properties）

package main.com.action.servletcfandct;

import com.sun.scenario.effect.impl.sw.sse.SSEBlend_SRC_OUTPeer;

import javax.servlet.ServletContext;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.net.URL;

import java.util.Properties;

import java.util.ResourceBundle;

public class ServletContextDqpzwj extends HttpServlet {

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

try {

System.out.println("通過ServletContext讀取配置檔案");

ServletContextDq();

System.out.println("通過ResourceBundle 讀取配置檔案");

resourceBundleTest();

System.out.println("通過類加載器讀取配置檔案");

ClassLoad();

System.out.println("通過Url 讀取配置檔案");

UrlTest();

} catch (Exception e) {

e.printStackTrace();

}

}

//通過ServletContext讀取配置檔案

public void ServletContextDq() throws Exception {

ServletContext context = getServletContext();

String contextPath = context.getRealPath("/WEB-INF/classes/db.properties");

InputStream is = new FileInputStream(contextPath);

Properties properties = new Properties();

properties.load(is);

System.out.println("驅動類+"+properties.getProperty("db.driver"));

}

//通過ResourceBundle 讀取配置檔案(隻能讀取類路徑下的配置檔案)

public void resourceBundleTest(){

ResourceBundle resourceBundle=ResourceBundle.getBundle("db");

System.out.println("驅動類+"+resourceBundle.getString("db.driver"));

}

//通過類加載器讀取配置檔案隻能讀取classes 和類路徑下的任意資源

public void ClassLoad() throws Exception{

//InputStream is= ServletContextDqpzwj.class.getClassLoader().getResourceAsStream("db.properties");

InputStream is= ServletContextDqpzwj.class.getClassLoader().getResourceAsStream("main/com/action/servletcfandct/db.properties");

Properties properties = new Properties();

properties.load(is);

System.out.println("驅動類+"+properties.getProperty("db.driver"));

}

public void UrlTest() throws Exception{

URL url= ServletContextDqpzwj.class.getClassLoader().getResource("main/com/action/servletcfandct/db.properties");

InputStream is=new FileInputStream(url.getPath());

Properties properties = new Properties();

properties.load(is);

System.out.println("驅動類+"+properties.getProperty("db.driver"));

}

@Override

protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

doPost(req, resp);

}

}