我制作了一个程序，它使用多个类来执行各种任务。然而，每个类每次运行都需要引用相同的文件路径。因此，在我的 jar 可执行文件中，我有一个属性文件，它有 2 个属性：filePath 和 installStatus。当我第一次运行该程序时，它会测试 installStatus ，如果该状态为“false”，则系统会提示用户选择创建某些文件和文件夹的位置。我的 jar config.properties 中的默认值是“FileLocation=null”和“Install=false”。该属性文件（在 Eclipse 中）与我的类位于同一包中，以便于访问。当我访问配置来测试安装状态（以确保我已运行该程序一次并制作了必要的文件）时，我没有收到任何错误，并且程序继续正确安装。我用于查找这些属性的执行代码如下：
prop.load(installationClass.class.getResourceAsStream("config.properties"));
// If the "Install" property is false then that means this program
// is being run for the first time to we go through the installation
// process and if it isn't, move to the next class
if(prop.getProperty("Install").equals("false")) {
myObj.installLocation();
} else {
FileNotFoundGUI fnfGUI = new FileNotFoundGUI();
fnfGUI.mainMethod();
}
在此类执行结束时，我希望将属性更新为用户选择的文件路径并安装为 true。我这样做如下所示：
prop.setProperty("Install", "true");
filePath = filePath + "\\Tracking Program\\Text Files";
prop.setProperty("FileLocation", filePath);
FileWriter fw = new FileWriter("config.properties");
prop.store(fw, null);
但是，这会在与我的 jar 文件相同的文件位置创建一个新的 config.properties 文件，我需要一个 filePath 来导航到并打开该文件。为了在其他类中获取该 filePath，我必须访问属性文件来检索它们，当然他们不知道它在哪里。有没有办法可以写入打包在我的 jar 文件中的 config.properties 文件？
我已经解压了我的 jar 文件，以确保我的 config.properties 文件在那里，它确实是这样，并且它有我原来添加的内容。这些添加内容不会更新，因为它会生成新的属性文件。我尝试了各种方法来访问此属性文件，并尝试在 jar 文件中进行访问，但到目前为止还没有成功。任何建议或想法将不胜感激。
TLDR：我想访问、读取和写入存储在可执行 jar 文件中的属性文件。
再次感谢大家的宝贵帮助。这是我想出的解决方案，以防其他人想做和我一样的事情。
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
import java.io.FileReader;
public class PropertiesTest {
public static void main(String[] args) throws IOException{
// Creating first property value to ensure they work seperately
// then making the directory that I wish to read from later
// System.getProperty("user.home") leads to C:\Users\YourUser
// so I am creating a file "Tracking Program" in C:\Users\YourUser
Properties propertiesWrite = new Properties();
File theDir = new File(System.getProperty("user.home") + "\\Tracking Program");
theDir.mkdir();
// This creates the config.properties file at the given destination
// and will also allow us to write to it
FileOutputStream fileOutputStream = new FileOutputStream(System.getProperty("user.home") + "\\Tracking Program\\config.properties");
// Creating two values (FileLocation and Install) and giving them
// values (null and false)
propertiesWrite.setProperty("FileLocation", "null");
propertiesWrite.setProperty("Install", "false");
// Storing the values we just created at fileOutputStream
// and not leaving any comments within the file
propertiesWrite.store(fileOutputStream,null);
// Closing fileOutputStream to avoid any memory leaks
fileOutputStream.close();
// Creating a new properties value to ensure no confusion
// between the usage of the properties variables
Properties propertiesRead = new Properties();
// Creating a file reader that will allow us to read
// from our properties file
FileReader fr = new FileReader(System.getProperty("user.home") + "\\Tracking Program\\config.properties");
// Loading the properties file so that we can actually
// retrieve data from it
propertiesRead.load(fr);
// Printing out one of the values to ensure we access the correct
// file and that it was properly written to (Prints "false")
System.out.println(propertiesRead.getProperty("Install"));
}
}
您最好使用
ReaderWriterPropertiesimport java.nio.file.Path;
import java.nio.file.Files;
import java.io.IOException;
import java.util.Properties;
import java.io.Reader;
import java.io.Writer;
public class PropertiesTest {
public static final String CONFIG_FILE = "config.properties";
public static void main(String[] args) throws IOException {
// Creating first property value to ensure they work seperately
// then making the directory that I wish to read from later
// System.getProperty("user.home") leads to C:\Users\YourUser
// so I am creating a file "Tracking Program" in C:\Users\YourUser
Properties propertiesWrite = new Properties();
// File theDir = new File(System.getProperty("user.home") + "\\Tracking
// Program");
Path configDir = Path.of(System.getProperty("user.home"), "Tracking Program");
boolean firstRun = true;
try {
Files.createDirectory(configDir);
} catch (IOException e) {
firstRun = false;
}
if (firstRun) {
// Creating two values (FileLocation and Install) and giving them
// values (null and false)
propertiesWrite.setProperty("FileLocation", "null");
propertiesWrite.setProperty("Install", "false");
// This creates the config.properties file at the given destination
// and will also allow us to write to it
try (Writer out = Files.newBufferedWriter(configDir.resolve(CONFIG_FILE))) {
// Storing the values we just created at fileOutputStream
// and not leaving any comments within the file
propertiesWrite.store(out, null);
}
}
// Creating a new properties value to ensure no confusion
// between the usage of the properties variables
Properties propertiesRead = new Properties();
// Creating a file reader that will allow us to read
// from our properties file
try (Reader in = Files.newBufferedReader(configDir.resolve(CONFIG_FILE))) {
// Loading the properties file so that we can actually
// retrieve data from it
propertiesRead.load(in);
}
// Printing out one of the values to ensure we access the correct
// file and that it was properly written to (Prints "false")
System.out.println(propertiesRead.getProperty("Install"));
}
}