方便操作Properties的Java类库：props4j
jopen
9年前
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"); //falseDefault values for empty keys or bad values
int defVal = props.intVal("unknown-key", 42); //42
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"); //2MultiProps 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));
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); //9Expressions ${...} in values
props.putVal("url", "127.0.0.1"); props.putVal("link1", "${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/some2Code 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
<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>