JAVA Web项目获取src和WebContent目录下的配置文件

一，获取src下面的配置文件信息

　　1，结构图如下：

　　

　　

package com.binp.properties;

import java.io.FileInputStream;
import java.io.InputStream;
import java.util.Properties;
import java.util.ResourceBundle;

public class GetPropertiesValues {

    public static void main(String[] args) throws Exception {

        //1,第一种方法（如果配置文件放在包下面，就需要在路径中把包的路径加上去）
        String path = GetPropertiesValues.class.getResource("/").getPath();

        System.out.println(path);

        FileInputStream fInputStream = new FileInputStream(path+"pro.properties");

        Properties properties = new Properties();

        properties.load(fInputStream);
        System.out.println(properties.getProperty("className"));

        //2,第二种方法（如果配置文件放在包下面，就需要在路径中把包的路径加上去）
        InputStream iStream = GetPropertiesValues.class.getResourceAsStream("/pro.properties");
        properties.load(iStream);
        iStream.close();

        System.out.println(properties.getProperty("method"));

        //3,第三种方法(此方法只能将配置文件放置在src目录下，不能放在包中)
        String value = ResourceBundle.getBundle("pro").getString("admin");

        System.out.println(value);

    }

}

二，获取WebContent目录下的配置文件

　　1，前提条件：是在tomcat启动的情况下：

@WebServlet("/testEvery")
public class testEveryServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;  

    /**
     * @see HttpServlet#HttpServlet()
     */
    public testEveryServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
    /**
     * 访问url：http://localhost:8080/demoProj/testEveryServlet
     */
    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
        String path = request.getSession().getServletContext().getRealPath("/config/sysconfig.properties");
        System.out.println("doGet读取到的/WEB-INF/config/sysconfig.properties:path:"+path);
        String url = request.getSession().getServletContext().getRealPath("/WEB-INF/config/config.properties");
        System.out.println("doGet读取到的/WEB-INF/config/config.properties:url:"+url);
        /**
         * 结果：
         * doGet:path:D:\tomcat7\wtpwebapps\demoProj\config\sysconfig.properties
         * doGet:url:D:\tomcat7\wtpwebapps\demoProj\WEB-INF\config\config.properties
         */
        //只能获取src下面的
         InputStream in = this.getServletContext().getResourceAsStream("/WEB-INF/classes/config/test.properties");
            Properties prop = new Properties();  //map
            prop.load(in);
            String url1 = prop.getProperty("url");
            System.out.println("获取到的url1:"+url1);//获取到的url1:www.baidu.com  

            //不可获取
            InputStream in2 = this.getServletContext().getResourceAsStream("/WEB-INF/config.properties");
            Properties prop2 = new Properties();  //map
            prop.load(in2);
            String url2 = prop2.getProperty("url");
            System.out.println("获取到的url2:"+url2);//获取到的url2:null  

          //不可获取
            InputStream in3 = this.getServletContext().getResourceAsStream("/webcontent.properties");
            Properties prop3 = new Properties();  //map
            prop.load(in3);
            String url3 = prop3.getProperty("url");
            System.out.println("获取到的url3:"+url3);//获取到的url3:null  

          //不可获取
            InputStream in4 = this.getServletContext().getResourceAsStream("/config/wcc.properties");
            Properties prop4 = new Properties();  //map
            prop.load(in4);
            String url4 = prop4.getProperty("url");
            System.out.println("获取到的url4:"+url4);//获取到的url4:null  

        // 读取src下config包中的testJava.java
//      InputStream in = ReadFile.class.getResourceAsStream("/config/testJava.java");//in为null
//      byte[] a=new byte[100];
//      in.read(a, 0, 900);
//      System.out.println("读取src下config包中的testJava.java的输入流in的内容toString："+in.toString());
//      System.out.println("读取到的a:"+a);
        String fileName3 = ReadFile.class.getResource("/config/test.properties").getFile();
        System.out.println("读取src下config包中的test.properties:"+fileName3);
//输出：读取src下config包中的test.properties:/D:/tomcat7/wtpwebapps/demoProj/WEB-INF/classes/config/test.properties
//      in.close();  

        // 读取src下 基名为myproperties的properties文件，获取其中name配置值
        String value = ResourceBundle.getBundle("myproperties").getString("name");
        System.out.println("获取到的myproperties.properties的值value："+value);
//输出：获取到的myproperties.properties的值value：myname  

        // 读取src下myproperties.properties
        InputStream in1 = ReadFile.class.getResourceAsStream("/myproperties.properties");
        Properties properties = new Properties();
        properties.load(in1);
        String value2 = properties.getProperty("name"); // 获得name属性
        System.out.println("获取到的myproperties.properties的值value2："+value2);
//获取到的myproperties.properties的值value2：myname          

        //读取src下的
        String sensitiveWordsServerPath1 = SysConfig.getSysParam("sensitiveWords_server_path1");
        System.out.println("获取的sensitiveWordsServerPath1:"+sensitiveWordsServerPath1);
        //获取的sensitiveWordsServerPath1:/datacms/htdocs/html/cctv/sensitiveWords/sws.xlsx  

        //读取src下的
        String pp = prop("sensitiveWords_server_path1");
        System.out.println("pp:"+pp);//pp:/datacms/htdocs/html/cctv/sensitiveWords/sws.xlsx
    }  

    public String prop(String url){
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("config/sysconfig.properties");
        Properties p  =   new  Properties();
        try {
            p.load(inputStream);
        } catch (Exception e) {
            e.printStackTrace();
        }
        System.out.println("p:"+p);
        return p.getProperty(url);
    }  

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
        String path = request.getSession().getServletContext().getRealPath("/config/sysconfig.properties");
        System.out.println("doPost:path:"+path);
    }  

}  

参考文档：https://blog.csdn.net/superit401/article/details/78206877