Question

我正在尝试使用config .properties文件中的值连接到数据库。每次它给文件找不到异常。相同的代码适用于核心java。

Properties prop = new Properties();
    InputStream input = null;

    try {

        input = new FileInputStream("prop/config.properties");

        // load a properties file
        prop.load(input);


        String ipaddress=prop.getProperty("com.mysql.ipaddress");
        String portno=prop.getProperty("com.mysql.portno");
        String dbname=prop.getProperty("com.mysql.dbname");
        String user=prop.getProperty("com.mysql.user");
        String password=prop.getProperty("com.mysql.password");

        // get the property value and print it out

        System.out.println(ipaddress);
        System.out.println(portno);
        System.out.println(dbname);
        System.out.println(user);
        System.out.println(password);

         try {Class.forName("com.mysql.jdbc.Driver");} 
           catch (ClassNotFoundException e) {e.printStackTrace();}
            try 
            {

                Connection connection2 = DriverManager.getConnection("jdbc:mysql://"+ipaddress+":"+portno+"/"+dbname,user,password);

            Statement stmt1=connection2.createStatement();
            ResultSet resultset1=stmt1.executeQuery("SELECT * FROM main_countt order by 1 desc");

            while(resultset1.next()) {

                System.out.println("Hello");
                System.out.print("<option id='"+resultset1.getString(1)+"' >"+resultset1.getString(2)+"</option>");        
                        }

            }
            catch(Exception e)
            {
                e.printStackTrace();
            }

    } catch (IOException ex) {
        ex.printStackTrace();
    } finally {
        if (input != null) {
            try {
                input.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

我得到的例外情况：

java.io.FileNotFoundException: prop\config.properties (The system cannot find the path specified)
    at java.io.FileInputStream.open(Native Method)
    at java.io.FileInputStream.<init>(Unknown Source)
    at java.io.FileInputStream.<init>(Unknown Source)
    at Test.servlet1.service(servlet1.java:44)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

Answer 1

您似乎正在尝试访问错误的路径。尝试输入完整路径（绝对路径）：

c:/.../prop/conf...

如何从servlet中的.property文件中读取值？

1 个答案: