properties

读取properties属性文件

折月煮酒 提交于 2020-01-01 11:33:17
1、通过类加载器加载 InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("Chapter8/test.properties"); Properties p = new Properties(); p.load(inputStream ); 2、通过文件系统加载 InputStream inputStream = new FileInputStream("Chapter8/test.properties"); 以下是获取当前工程路径的方法: 注意: Class.getResource(String path) path不以’/'开头时,默认是从此类所在的包下取资源; path以’/'开头时,则是从ClassPath根下获取; Class.getClassLoader().getResource(String path) path不能以’/'开头时; path是从ClassPath根下获取; public static void main(String[] args) { // TODO Auto-generated method stub String[] path = new String[5]; path[0] = Thread.currentThread()

java配置文件的使用 —— 设置一个类为单例模式

匆匆过客 提交于 2020-01-01 11:16:11
阅读本文章前建议先阅读: java通过JDBC访问sqlserver数据库 一、使用原因:通过JDBC连接数据库时有时会需要连接不同的数据库,而jar包、连接url、用户名和密码等都是写定在程序中,不便修改,因此引入配置文件(key-value),可以通过key得到对应的value,即动态获取数据。 二、实现步骤 1.编写配置文件database.properties; 2.创建包com.yh.util,编写类ConfigManager,读取属性文件; 3.修改连接数据库的参数。 三、代码示例 database.properties jdbc.SQLServerDriver.class=com.microsoft.sqlserver.jdbc.SQLServerDriver jdbc.connection.url=jdbc:sqlserver://127.0.0.1:1433;databaseName=news jdbc.connection.username=sa jdbc.connection.password=12345yehuan ConfigManager.java package com.yh.util; import java.io.IOException; import java.io.InputStream; import java.util.Properties

Dependent observable property in Matlab. Does it work?

痞子三分冷 提交于 2020-01-01 10:02:07
问题 In Matlab class it seems to be syntactically correct to declare property that is Dependent (computed not stored) and Observable in the same time. Consider code properties (Access = private) instanceOfAnotherClass end properties (SetAccess = private, Dependent, SetObservable) propertyTwo end methods function val = get.propertyTwo(this) val = this.instanceOfAnotherClass.propertyOne; end end Does this work as expected? That is, if the property propertyOne of an object stored in

how can you find out if an NSObject has a certain property?

时光总嘲笑我的痴心妄想 提交于 2020-01-01 08:12:49
问题 Let's say in Apple API version 1.0, there is a class NSFoo with a property 'color'. API 1.1 adds property 'size'. I want to know whether I can use the getter: myFoo.size [myFoo respondsToSelector:@selector(getSize)] doesn't work as expected. What's the correct way to find out if an object has a property? Thanks! 回答1: You're close. Your selector should be exactly the message you want to send to the object: if ( [myFoo respondsToSelector:@selector(size)] ) { int size = [myFoo size]; // or myFoo

Updating a properties file injected by Spring to include a last run timestamp

徘徊边缘 提交于 2020-01-01 07:05:36
问题 I have an application which makes used of a properties file loaded by Spring. The Properties instance is then injected into a few classes. The question is some of these properties are updated - for example we have a lastRun timestamp which we want to store here. Maybe there is a better way to go about storing something like this (suggestions welcome), but how can I go about updating the properties file? <util:properties id="props" location="some.properties"/> The props.store(...) method

Swift - Lazy loading a property that can be made nil later

落花浮王杯 提交于 2020-01-01 06:43:36
问题 I am looking for a way to lazy load my variable, but I want to be able to make it nil later and then recreate it on the get. For example in the instance that there is a memory warning i want to clear anything that isn't used and then recreate it when needed again later. Here is how I would do it in Objective-C and my current interpretation in swift. I am not sure that it preserves the variable for keeping current navigation. Obj-C Implementation @property (strong, nonatomic, readwrite)

Reasons for using Ant Properties files over “Properties Tasks”

纵饮孤独 提交于 2020-01-01 05:48:07
问题 I'm currently working with some developers who like to set up Ant tasks that define environment specific variables rather than using properties files. It seems they prefer to do this because it's easier to type: ant <environment task> dist Than it is to type: ant -propertyfile <environment property file> dist So for example: <project name="whatever" default="dist"> <target name="local"> <property name="webXml" value="WebContent/WEB-INF/web-local.xml"/> </target> <target name="remote">

Do I need ARC keywords for properties that I don't synthesize?

耗尽温柔 提交于 2020-01-01 05:38:07
问题 I have a property that I do not synthesize, instead I create a getter and setter myself. Therefore, the ARC keywords (strong or weak) have no meaning, I assume, so I eliminate them. This works fine on Xcode 4.3, but when my coworker opens them on XCode 4.2 the compiler complains that there is no strong/weak keyword, so I instructed him to meaninglessly enter the keyword back in again. Which is correct (with or without keywords)? To be clear: I have a property like this @property (nonatomic)

Overwrite the properties file if command line value is present

别来无恙 提交于 2020-01-01 05:37:07
问题 I have a program which will read everything from config.properties file if command line does not contain any arguments apart from config.properties file location. Below is my config.properties file- NUMBER_OF_THREADS: 100 NUMBER_OF_TASKS: 10000 ID_START_RANGE: 1 TABLES: TABLE1,TABLE2 If I am running my program from the command prompt like this- java -jar Test.jar "C:\\test\\config.properties" It should read all the four properties from the config.properties file. But suppose if I am running

Access elements in json object like an array [duplicate]

帅比萌擦擦* 提交于 2020-01-01 04:20:35
问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: I have a nested data structure / JSON, how can I access a specific value? I have a json object, like the one below: [ ["Blankaholm", "Gamleby"], ["2012-10-23", "2012-10-22"], ["Blankaholm. Under natten har det varit inbrott", "E22 i med Gamleby. Singelolycka. En bilist har.], ["57.586174","16.521841"], ["57.893162","16.406090"] ] It consists of 4 "property levels" (city, date, description and coordinates). What