Guice 学习（七）常量和属性的注入（ Constant and Property Inject）

本文主要是介绍Guice 学习（七）常量和属性的注入（ Constant and Property Inject），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1、常量注入方式

package com.guice.ConstantInjectDemo;import com.google.inject.Binder;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Module;
import com.google.inject.name.Named;
import com.google.inject.name.Names;/**  绑定常量*/
public class ConstantInjectDemo {@Inject@Named("a")private int a;public static void main(String[] args) {ConstantInjectDemo instance = Guice.createInjector(new Module() {@Overridepublic void configure(Binder binder) {// 将数值22绑定到常量值a上binder.bindConstant().annotatedWith(Names.named("a")).to(22);}}).getInstance(ConstantInjectDemo.class);System.out.println(instance.a);// 22}
}

除了可以绑定int外，在ConstantBindingBuilder类中还可以绑定其它的基本类型。
com.google.inject.binder.ConstantBindingBuilder.to(String)
com.google.inject.binder.ConstantBindingBuilder.to(long)
com.google.inject.binder.ConstantBindingBuilder.to(boolean)
com.google.inject.binder.ConstantBindingBuilder.to(double)
com.google.inject.binder.ConstantBindingBuilder.to(float)
com.google.inject.binder.ConstantBindingBuilder.to(short)
com.google.inject.binder.ConstantBindingBuilder.to(char)

2、属性注入方式

package com.guice.ConstantInjectDemo;import java.util.Properties;import com.google.inject.Binder;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Module;
import com.google.inject.name.Named;
import com.google.inject.name.Names;/*** TODO : 绑定Properties 除了可以绑定基本类型外，还可以绑定一个Properties到Guice中，当然了，由于Properties本质上时一个Map<String,String>， 因此Guice也允许绑定一个Map<String,String>。* * @author E468380*/
public class PropertiesInjectDemo {@Inject@Named("csdn")private String csdn;public static void main(String[] args) {PropertiesInjectDemo instance = Guice.createInjector(new Module() {@Overridepublic void configure(Binder binder) {Properties properties = new Properties();properties.setProperty("csdn", "www.csdn.com");Names.bindProperties(binder, properties);}}).getInstance(PropertiesInjectDemo.class);System.out.println(instance.csdn);}
}