方便操作Properties的Java类库：props4j

2017-2-7 13:41| 发布者: zhangjf| 查看: 472| 评论: 0

摘要: 方便操作Properties的Java类库。简单和实用的properties工具，没有任何依赖。 Cases Props with auto convert values import base.props4j.impl.MapProps;MapProps props = new MapProps();props.putVal(key1, 1); ...

方便操作Properties的Java类库。简单和实用的properties工具，没有任何依赖。

Cases Props with auto convert values

import base.props4j.impl.MapProps;
MapProps props = new MapProps();
props.putVal("key1", 1);
props.putVal("key2", "val2");
props.putVal("key3", true);
String strVal_1 = props.strVal("key1"); //"1"
long longVal_1 = props.longVal("key1"); //1L
Boolean boolVal_1 = props.boolVal("key1"); //false

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Default values for empty keys or bad values

int defVal = props.intVal("unknown-key", 42); //42

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File props with updates check

import base.props4j.impl.FileProps;
import java.io.File;
File file = new File("test.properties");
writeToFile(file, "key1 = 1");
FileProps props = new FileProps(file);
int val = props.intVal("key1"); //1
//update file
writeToFile(file, "key1 = 2");
Thread.sleep(...);
int newVal = props.intVal("key1"); //2

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MultiProps for many sources

import base.props4j.impl.FileProps;
import base.props4j.impl.MultiProps;
MultiProps props = new MultiProps();
props.addSource(new FileProps(file1));
props.addSource(new FileProps(file2));

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Enum for keys!

import base.props4j.DefValKey;
public enum Keys implements DefValKey {
planets_in_solar_system(8),
is_frog_green(true),
myName("Evgeny"),
star_wars_episodes_count(999.999d),
...
}
MapProps props = new MapProps();
int defVal = Keys.planets_in_solar_system.intFrom(props); //8
props.putVal(planets_in_solar_system, 9);
int updatedVal = Keys.planets_in_solar_system.intFrom(props); //9

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Expressions ${...} in values

props.putVal("url", "127.0.0.1");
props.putVal("link1", "${url}/some1");
props.putVal("link2", "${url}/some2");
String link1 = props.strVal("link1"); // 127.0.0.1/some1
String link2 = props.strVal("link2"); // 127.0.0.1/some2

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Code examples Example 1: Simple MapProps and basic get-put methods Example 2: FileProps for file properties Example 3: FileProps and file updated check Example 4: MultiProps for many props sources Example 5: Java Enums are best keys for props! Example 6: Expressions ${...} in values Production ready

Props4j has been successfully used on Cheapchat.me and in open source live-chat-engine project.

Installation to your project

Java 8 is required (sources can easily be ported to Java 6 or 7 -- but I'm on Java 8 now :))

by Maven

via stackoverflow

<dependencies>
<dependency>
<groupId>com.github.edolganov</groupId>
<artifactId>props4j</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>jitpack.io</id>
<url>https://jitpack.io</url>
</repository>
</repositories>

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项目主页：http://www.open-open.com/lib/view/home/1451046744651

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方便操作Properties的Java类库：props4j

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