无法从java中的属性文件中读取值

实际上，我正在尝试从JSP页面获取值，并将这些数据写入config.properties文件。 我能把数据写进去。 但是我无法从config.properties文件中读取属性值

public static void startup() throws ReflectiveOperationException, Exception {
        String configPath ="C:/Selenium_Automation_JSP/automation/src/com/selenium/config/config.properties";
        DriverScript Test = new DriverScript(configPath);
        System.out.println("Config path loaded");
        Test.start(configPath);
    }

        public void start(String configPath) throws ReflectiveOperationException, IllegalArgumentException, Exception{



            System.out.println(configPath);

            CONFIG=new Properties();
            FileInputStream fs = new FileInputStream(configPath);
            CONFIG.load(fs);

            String mapFile=CONFIG.getProperty("Suite");

            System.out.println(mapFile);
            SuiteXLS  = new Xls_Reader(mapFile);

在控制台中，我可以看到config.properties的路径。但是在读取文件时，它显示以下错误：

Config path loaded
C:/Selenium_Automation_JSP/automation/src/com/selenium/config/config.properties
null
java.lang.NullPointerException
    at java.io.FileInputStream.<init>(FileInputStream.java:124)
    at java.io.FileInputStream.<init>(FileInputStream.java:87)
    at com.selenium8x8.xlsoperations.Xls_Reader.<init>(Xls_Reader.java:43)
    at com.selenium8x8.driver.DriverScript.start(DriverScript.java:106)
    at com.selenium8x8.driver.DriverScript.startup(DriverScript.java:85)
    at com.selenium8x8.servlet.ControlServlet.doPost(ControlServlet.java:120)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:724)

---

但是我无法读取“Suite”属性值。

您需要将configPath更改为：

String configPath ="C:\\Selenium_Automation_JSP\\automation\\src\\com\\selenium\\config\\config.properties";

然后像这样加载它：

CONFIG.load(new FileInputStream(configPath));

编辑：根据@sircapsalot，绝对路径是个坏主意。如果您认为您的configPath会更改，可以使用regex或类似的工具将其更改为绝对路径，然后将其传递到

文件输入流

。我应该明确指出，FileInputStream确实需要绝对路径才能工作。

试试看

CONFIG=new Properties();
CONFIG.store(new FileOutputStream(configPath), null);
CONFIG.getProperty("Suite");

---

这很糟糕。。不要推荐这样的绝对路径！使用

ClassLoader

s

CONFIG=new Properties();
CONFIG.store(new FileOutputStream(configPath), null);
CONFIG.getProperty("Suite");