本文参照Http编码的配置源码，自己实现一个starter。

1.新建maven工程。

在pom.xml中修改，添加autoconfigure依赖：

4.0.0com.springboot springboot_starter 1.0-SNAPSHOTorg.apache.maven.plugins maven-compiler-plugin 2.51.81.8jarspringboot_starterUTF-8org.springframework.boot spring-boot-autoconfigure 1.5.8.RELEASEorg.springframework.boot spring-boot-configuration-processor 1.5.8.RELEASEtruejunit junit 3.8.1test4.0.0com.springboot springboot_starter 1.0-SNAPSHOTorg.apache.maven.plugins maven-compiler-plugin 2.51.81.8jarspringboot_starterUTF-8

2.属性配置类，代码如下。

package com.springboot; import org.springframework.boot.context.properties.ConfigurationProperties; import javax.naming.Name; @ConfigurationProperties(prefix = "user")public class UserInfoProperties { private static final String UNAME = "springboot"; private String uName = UNAME; public String getUName() { return uName; } public void setUName(String uName) { this.uName = uName; }}

3.判断依据类，代码如下。

package com.springboot; public class UserInfo { private String uName; public String getUserInfo(){ return "My name is " + getUName(); } public String getUName() { return uName; } public void setUName(String uName) { this.uName = uName; }}

4.自动配置类，代码如下。

package com.springboot; import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;import org.springframework.boot.context.properties.EnableConfigurationProperties;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration; @Configuration@EnableConfigurationProperties(UserInfoProperties.class)@ConditionalOnClass(UserInfo.class)@ConditionalOnProperty(prefix = "user