java - 从添加到项目的 jar 中读取动态 Web 项目中存在的属性文件

Question

我正在开发一个动态 Web 项目(DWP)，它有一个属性文件。已创建一个 jar，该 jar 应该读取 DWP 中属性文件的内容以及属性文件中的更改，并将更改合并到 DWP 中。我无法从 jar 中读取属性文件。我想知道DWP中的jar如何读取DWP的属性文件

这是 jar 的代码

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;

public class fileReader extends Thread 
{
    publicstatic long oldTMS;
    long currentTMS;
    File file;
    public static long limit;
    //static String Path = "./configuration/RequestLimit.properties";
    static String Path="configuration/RequestLimit.properties";
    public static Properties properties;    
    public fileReader() throws IOException, InterruptedException {    
        System.out.println("Reading the property file for the first time");
        Thread thread = new Thread();
        setDaemon(true);    
        FileInputStream in = new FileInputStream(Path);
        System.out.println("fd:"+in.getFD());
        properties = new Properties();
        properties.load(in);
        String requestLimit = properties.getProperty("RequestLimit");           
        System.out
                .println("request limit as read from the property file is ----"
                        + requestLimit);
        limit = Long.parseLong(properties.getProperty("RequestLimit"));    
        System.out.println("request limit as per the  reading is ---" + limit);
        start();
        // waits for the thread to die
        join();    
    }    
    public void run() {    
        System.out.println(" thread starts");
        if (Thread.currentThread().isDaemon()) {
            while (true) {
                try {
                    Thread.sleep(3000);
                    System.out.println("entered in infinite loop");
                    file = new File(Path);
                    System.out.println("file name is --------" + file);
                    currentTMS = file.lastModified();
                    SimpleDateFormat dateFormat = new SimpleDateFormat(
                            "E yyyy.MM.dd 'at' hh:mm:ss a zzz");    
                    System.out.println("file initial change time stamp:::::"
                            + dateFormat.format(currentTMS));    
                    try {    
                        System.out
                                .println("lets see if the file has changed or not !!");    
                        FileInputStream d = new FileInputStream(file);    
                        if (oldTMS != currentTMS) {
                            System.out.println("checking for old and new time stamp!");    
                            oldTMS = currentTMS;    
                            System.out.println("file modified last at-----------"
                                            + oldTMS);
                            // reload property
                            try {    
                                System.out.println("Reloading property file");
                                properties.load(d);    
                                System.out.println("After Reloading property file properties : "
                                                + properties
                                                        .getProperty("RequestLimit"));    
                                limit = Long.parseLong(properties
                                        .getProperty("RequestLimit"));
                                System.out.println("request limit as per the  reading is ---"
                                                + limit);    
                            } catch (Exception e) {
                                e.printStackTrace();
                            }
                        }
                    } catch (Exception e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }

                } 
                catch (InterruptedException e2) 
                {
                    // TODO Auto-generated catch block
                    e2.printStackTrace();
                }    
            }
        }    
    }    
} 

像这样在 DWP 中使用 jar

package com.ING;    
import java.io.IOException;    
import com.change.fileReader;    
public class deamonCaller
{    
    public long callDeamon() throws IOException, InterruptedException 
    {
        fileReader fr = new fileReader();
         Long requestLimit =fileReader.limit;
        return requestLimit;            
    }    
}

Answer 1

请尝试使用以下代码。希望对您有很大帮助。

static String Path="configuration/RequestLimit.properties";
loadProperties(Path);     

private void loadProperties(String propertiesName) {

        if (properties != null) {
            return;
        }

        // Properties properties = null;
        InputStream inputStream = null;

        inputStream = this.getClass().getResourceAsStream(propertiesName);
        if (inputStream == null) {
            throw new Exception(propertiesName + "something");
        }

        properties = new Properties();
        try {
            properties.load(inputStream);
        } catch (IOException e) {
            throw new Exception(e);
        }
    }