Guice是谷歌推出的一个轻量级依赖注入框架，帮助我们解决Java项目中的依赖注入问题。如果只想在项目中使用依赖注入，这时候我们可以考虑使用Guice，不需要使用Spring那个庞然大物。本文参考了Guice官方文档，详细信息可以直接查看Guice文档。
一、引入依赖
maven配置
<dependency>
<groupId>com.google.inject</groupId> <artifactId>guice</artifactId> <version>4.1.0</version></dependency>
二、Guice+mybatis项目搭建
下面将以Guice结合mybatis搭建一个简单的项目，更好的去了解。
maven项目目录
image
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion>
<groupId>com.leejlife</groupId>
<artifactId>guice</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>guice</name>
<url></url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<guice.version>3.0</guice.version>
<mybatis.version>3.2.6</mybatis.version>
<mybatis-guice.version>3.6</mybatis-guice.version>
<mysql-jdbc.version>5.1.38</mysql-jdbc.version>
<mchange.c3p0.version>0.9.2.1</mchange.c3p0.version>
<c3p0.version>0.9.2.1</c3p0.version>
<slf4j.version>1.7.5</slf4j.version>
<logback.version>1.0.13</logback.version>
</properties>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
<dependency>
<groupId>commons-configuration</groupId> <artifactId>commons-configuration</artifactId> <version>1.5</version> </dependency> <dependency><groupId>com.google.inject</groupId>
<artifactId>guice</artifactId>
<version>${guice.version}</version>
</dependency>
<dependency>
<groupId>com.google.guiceberry</groupId>
<artifactId>guiceberry</artifactId>
<version>3.3.1</version>
<scope>test</scope>
</dependency>
<dependency><groupId>com.google.inject.extensions</groupId>
<artifactId>guice-persist</artifactId>
<version>${guice.version}</version>
</dependency>
<dependency>
<groupId>com.google.inject.extensions</groupId>
<artifactId>guice-multibindings</artifactId>
<version>${guice.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-guice</artifactId>
<version>${mybatis-guice.version}</version>
</dependency>
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>${mchange.c3p0.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId> <version>3.5</version></dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>${logback.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
</dependencies>
<build>
<filters>
<filter>../guice/profile-${profiles.active}.properties</filter>
</filters>
<resources>
<resource>
<filtering>true</filtering>
<directory>src/main/resources</directory>
<includes>
<include>*/.properties</include>
<include>*/.xml</include>
</includes>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.4</version>
<configuration>
<skip>true</skip>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>1.5</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<shadedArtifactAttached>true</shadedArtifactAttached>
<shadedClassifierName>allinone</shadedClassifierName>
<artifactSet>
<includes>
<include>:</include>
</includes>
</artifactSet>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>reference.conf</resource>
</transformer>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<manifestEntries>
<Main-Class>com.leejlife.guice.GuiceServer</Main-Class>
</manifestEntries>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>dev</id>
<properties>
<profiles.active>dev</profiles.active>
</properties>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
</profile>
<profile>
<id>sit</id>
<properties>
<profiles.active>sit</profiles.active>
</properties>
</profile>
<profile>
<id>prod</id>
<properties>
<profiles.active>prod</profiles.active>
</properties>
</profile>
</profiles>
</project>
package com.leejlife.guice.model;
public interface DBMapper {
String selectMaxData();}
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.leejlife.guice.model.DBMapper">
<select id="selectMaxData" resultType="String"> select max(data) from t_test </select></mapper>
DBModule.java
package com.leejlife.guice.module;
import java.util.Properties;
import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;
import org.mybatis.guice.MyBatisModule;
import org.mybatis.guice.datasource.c3p0.C3p0DataSourceProvider;
import com.google.inject.PrivateModule;
import com.google.inject.name.Names;
import com.leejlife.guice.model.DBMapper;
public class DBModule extends PrivateModule {
@Override
protected void configure() {
this.install(new MyBatisModule() { @Override protected void initialize() { bindDataSourceProviderType(C3p0DataSourceProvider.class); bindTransactionFactoryType(JdbcTransactionFactory.class); addMapperClass(DBMapper.class); Names.bindProperties(binder(), createProperties("db.properties")); } }); expose(DBMapper.class);}
private Properties createProperties(String configFile) {
Properties result = new Properties(); try { result.load(DBModule.class.getClassLoader().getResourceAsStream(configFile)); return result; } catch (Exception e) { throw new RuntimeException("can not load " + configFile + " .", e); } }}
Module.java
package com.leejlife.guice.module;
import com.google.inject.AbstractModule;
import com.google.inject.Scopes;
import com.leejlife.guice.service.ProcessService;
public class Module extends AbstractModule {
@Override
protected void configure() {
install(new DBModule()); bind(ProcessService.class).in(Scopes.SINGLETON); }}
ProcessService.java使用注解
package com.leejlife.guice.service;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.inject.Inject;
import com.leejlife.guice.model.DBMapper;
public class ProcessService {
private final static Logger log = LoggerFactory.getLogger(ProcessService.class);
@Inject private DBMapper dbMapper; public void process(){ log.info("mabatis查询出最大Data:"+dbMapper.selectMaxData()); }}
配置文件
db.properties
mybatis.environment.id = guice
JDBC.driver=${JDBC.driver}
JDBC.url=${JDBC.url}
JDBC.username=${JDBC.username}
JDBC.password=${JDBC.password}
c3p0.maxPoolSize=40
c3p0.minPoolSize=10
c3p0.acquireIncrement=2
c3p0.maxIdleTime=1800
c3p0.idleConnectionTestPeriod=60
c3p0.testConnectionOnCheckout = false
c3p0.testConnectionOnCheckin = true
client will wait 30s to get a connection
c3p0.checkoutTimeout=30000
配置profile-dev.properties，注意配上自己的数据源。这里使用的是mysql
mysql connection
JDBC.driver=com.mysql.jdbc.Driver
JDBC.url=
JDBC.username=
JDBC.password=
c3p0 config
c3p0.maxPoolSize=40
c3p0.minPoolSize=10
c3p0.acquireIncrement=2
c3p0.maxIdleTime=1800
c3p0.idleConnectionTestPeriod=60
c3p0.testConnectionOnCheckout = false
c3p0.testConnectionOnCheckin = true
client will wait 30s to get a connection
c3p0.checkoutTimeout=30000
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