Spring Boot的底层原理
之前学习过了Spring Boot（在88章博客），但是并没有很深入的了解，这里致力于在原来的基础上学习更多Spring Boot知识
<?xml version="1.0" encoding="UTF-8"?>
< projectxmlns = " 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 https://maven.apache.org/xsd/maven-4.0.0.xsd" > < modelVersion> </ modelVersion> < parent> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> < relativePath/> </ parent> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> < name> </ name> < description> </ description> < properties> < java.version> </ java.version> </ properties> < dependencies> < dependency> < groupId> </ groupId> < artifactId> </ artifactId> </ dependency> < dependency> < groupId> </ groupId> < artifactId> </ artifactId> < scope> </ scope> </ dependency> </ dependencies> < build> < plugins> < plugin> < groupId> </ groupId> < artifactId> </ artifactId> </ plugin> </ plugins> </ build> </ project>
package com. boot. controller ;
import org. springframework. web. bind. annotation. RequestMapping ;
import org. springframework. web. bind. annotation. RestController ;
@RestController
@RequestMapping ( "hello" )
public class HelloController {
@RequestMapping ( "/boot" )
public String helloBoot ( ) {
return "Hello Spring Boot" ;
}
}
package com. boot ;
import org. springframework. boot. SpringApplication ;
import org. springframework. boot. autoconfigure. SpringBootApplication ;
@SpringBootApplication
public class BootApplication {
public static void main ( String [ ] args) {
SpringApplication . run ( BootApplication . class , args) ;
}
}
< dependency> < groupId> </ groupId> < artifactId> </ artifactId> < scope> </ scope> </ dependency> < dependency> < groupId> </ groupId> < artifactId> </ artifactId> < scope> </ scope> </ dependency> package com. boot ;
import com. boot. controller. HelloController ;
import org. junit. jupiter. api. Test ;
import org. junit. runner. RunWith ;
import org. springframework. beans. factory. annotation. Autowired ;
import org. springframework. boot. test. context. SpringBootTest ;
import org. springframework. test. context. junit4. SpringRunner ;
@RunWith ( SpringRunner . class )
@SpringBootTest
class BootApplicationTests {
@Autowired
private HelloController helloController;
@Test
public void contextLoads ( ) {
String s = helloController. helloBoot ( ) ;
System . out. println ( s) ;
}
}
< dependency> < groupId> </ groupId> < artifactId> </ artifactId> </ dependency>
#修改tomcat的端口号（有些时候也可以说是版本号）
server.port=8888
#注意：
#spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver中
#他后面不能有空格，否则报错，这是一个特殊的地方，当然可以不写，会根据驱动默认加上的（这一般是spring boot自身的处理，其他的如单纯的spring可能还是需要指定）
#其他的基本都可以有空格（且空格无影响，相当于没有什么，基本不会参与到数值里面去）
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/ceshi
spring.datasource.username=root
spring.datasource.password=123456
< dependency> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> </ dependency> < dependency> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> </ dependency> package com. boot. controller ;
import org. springframework. beans. factory. annotation. Autowired ;
import org. springframework. jdbc. core. JdbcTemplate ;
import org. springframework. web. bind. annotation. RequestMapping ;
import org. springframework. web. bind. annotation. RestController ;
@RestController
@RequestMapping ( "hello" )
public class HelloController {
@RequestMapping ( "/boot" )
public String helloBoot ( ) {
return "Hello Spring Boot" ;
}
@Autowired
private JdbcTemplate jdbcTemplate;
@RequestMapping ( "/jdbc" )
public String jdbc ( ) {
return jdbcTemplate. toString ( ) ;
}
}
package com. boot. pojo ;
public class Pet {
private String type;
private String name;
@Override
public String toString ( ) {
return "Pet{" +
"type='" + type + '\'' +
", name='" + name + '\'' +
'}' ;
}
public String getType ( ) {
return type;
}
public void setType ( String type) {
this . type = type;
}
public String getName ( ) {
return name;
}
public void setName ( String name) {
this . name = name;
}
}
package com. boot. pojo ;
import org. springframework. boot. context. properties. ConfigurationProperties ;
import org. springframework. stereotype. Component ;
import java. util. Arrays ;
import java. util. List ;
import java. util. Map ;
@Component
@ConfigurationProperties ( prefix = "person" )
public class Person {
private int id;
private String name;
private List hobby;
private String [ ] family;
private Map map;
private Pet pet;
@Override
public String toString ( ) {
return "Person{" +
"id=" + id +
", name='" + name + '\'' +
", hobby=" + hobby +
", family=" + Arrays . toString ( family) +
", map=" + map +
", pet=" + pet +
'}' ;
}
public int getId ( ) {
return id;
}
public void setId ( int id) {
this . id = id;
}
public String getName ( ) {
return name;
}
public void setName ( String name) {
this . name = name;
}
public List getHobby ( ) {
return hobby;
}
public void setHobby ( List hobby) {
this . hobby = hobby;
}
public String [ ] getFamily ( ) {
return family;
}
public void setFamily ( String [ ] family) {
this . family = family;
}
public Map getMap ( ) {
return map;
}
public void setMap ( Map map) {
this . map = map;
}
public Pet getPet ( ) {
return pet;
}
public void setPet ( Pet pet) {
this . pet = pet;
}
}
#自定义配置信息注入到Person对象中
person.id=100
person.name=哈哈
#list
person.hobby=喝水,吃早餐
#String[]
person.family=儿子,老婆
#集合和对象，一般都需要多一个层（多了.）
#Map
person.map.k1=v1
person.map.k2=v2
#Pet对象
person.pet.type=狗
person.pet.name=旺财
#他们可以使用@Value注解来进行注入（对应的参数获取），因为他们是全局的
@Autowired
private Person person;
@Test
public void configurationTest ( ) {
System . out. println ( person) ;
}
< includes> < include> </ include> < include> </ include> < include> </ include> </ includes> server :
port : 8080
servlet :
context-path : /hello
@Value ( "${person.id}" )
private int id;
#对实体类对象MyProperties进行属性配置
test.id=110
test.name=test
package com. boot. pojo ;
import org. springframework. boot. context. properties. ConfigurationProperties ;
import org. springframework. context. annotation. PropertySource ;
import org. springframework. stereotype. Component ;
@Component
@PropertySource ( "classpath:test.properties" )
@ConfigurationProperties ( prefix = "test" )
public class MyProperties {
private int id;
private String name;
@Override
public String toString ( ) {
return "MyProperties{" +
"id=" + id +
", name='" + name + '\'' +
'}' ;
}
public int getId ( ) {
return id;
}
public void setId ( int id) {
this . id = id;
}
public String getName ( ) {
return name;
}
public void setName ( String name) {
this . name = name;
}
}
@Autowired
private MyProperties myProperties;
@Test
public void myPropertiesTest ( ) {
System . out. println ( myProperties) ;
}
@Configuration
public class MyConfig {
@Bean
public MyService myService ( ) {
return new MyService ( ) ;
}
}
@Autowired
private MyService myService;
@Autowired
private MyConfig myConfig;
@Test
public void iocTest ( ) {
System . out. println ( myService) ;
System . out. println ( myConfig) ;
}
@Autowired
private ApplicationContext applicationContext;
@Test
public void Test ( ) {
System . out. println ( applicationContext. getBean ( "myService2" ) ) ;
System . out. println ( applicationContext. containsBean ( "myService2" ) ) ;
}
my.secret=${random.value} // 配置随机值
my.number=${random.int} // 配置随机整数
my.bignumber=${random.long} // 配置随机long类型数
my.uuid=${random.uuid} // 配置随机uuid类型数
my.number.less.than.ten=${random.int(10)} // 配置小于10的随机整数
my.number.in.range=${random.int[1024,65536]} // 配置范围在[1024,65536]之间的随机整数
package com. boot. pojo ;
import org. springframework. boot. context. properties. ConfigurationProperties ;
import org. springframework. stereotype. Component ;
@Component
@ConfigurationProperties ( prefix = "test" )
public class MyTest {
private int id;
private String name;
@Override
public String toString ( ) {
return "MyTest{" +
"id=" + id +
", name='" + name + '\'' +
'}' ;
}
public int getId ( ) {
return id;
}
public void setId ( int id) {
this . id = id;
}
public String getName ( ) {
return name;
}
public void setName ( String name) {
this . name = name;
}
}
test :
id : ${
random.int}
name : ${
random.int[ 1024 , 65536 ] }
@Autowired
private MyTest myTest;
@Test
public void fa ( ) {
System . out. println ( myTest) ;
}
app.name=MyApp
app.description=${app.name} is a Spring Boot application
test :
ui : 8
id : ${
random.int}
name : ${
random.int[ 1024 , 65536 ] }
de : ${
test.id} is ${
test.ui}
private String de;
public String getDe ( ) {
return de;
}
public void setDe ( String de) {
this . de = de;
}
@Override
public String toString ( ) {
return "MyTest{" +
"id=" + id +
", name='" + name + '\'' +
", de='" + de + '\'' +
'}' ;
}
test :
ui : 8
id : ${
random.int}
name : ${
random.int[ 1024 , 65536 ] }
de : ${
test.id} is ${
test.ui}
< parent> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> < relativePath/> </ parent> < dependency> < groupId> </ groupId> < artifactId> </ artifactId> </ dependency> < parent> < groupId> </ groupId> < artifactId> </ artifactId> < version> </ version> </ parent> < properties> < activemq.version> </ activemq.version> < antlr2.version> </ antlr2.version> < appengine-sdk.version> </ appengine-sdk.version> < artemis.version> </ artemis.version> < aspectj.version> </ aspectj.version> package com. boot ;
import org. springframework. boot. SpringApplication ;
import org. springframework. boot. autoconfigure. SpringBootApplication ;
@SpringBootApplication
public class BootApplication {
public static void main ( String [ ] args) {
SpringApplication . run ( BootApplication . class , args) ;
}
}
package org. springframework. boot. autoconfigure ;
import java. lang. annotation. Documented ;
import java. lang. annotation. ElementType ;
import java. lang. annotation. Inherited ;
import java. lang. annotation. Retention ;
import java. lang. annotation. RetentionPolicy ;
import java. lang. annotation. Target ;
import org. springframework. beans. factory. support. BeanNameGenerator ;
import org. springframework. boot. SpringBootConfiguration ;
import org. springframework. boot. context. TypeExcludeFilter ;
import org. springframework. context. annotation. ComponentScan ;
import org. springframework. context. annotation. Configuration ;
import org. springframework. context. annotation. FilterType ;
import org. springframework. context. annotation. ComponentScan . Filter ;
import org. springframework. core. annotation. AliasFor ;
@Target ( {
ElementType . TYPE } )
@Retention ( RetentionPolicy . RUNTIME )
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan (
excludeFilters = {
@Filter (
type = FilterType . CUSTOM ,
classes = {
TypeExcludeFilter . class }
) , @Filter (
type = FilterType . CUSTOM ,
classes = {
AutoConfigurationExcludeFilter . class }
) }
)
public @interface SpringBootApplication {
@AliasFor (
annotation = EnableAutoConfiguration . class
)
Class < ? > [ ] exclude ( ) default {
} ;
@AliasFor (
annotation = EnableAutoConfiguration . class
)
String [ ] excludeName ( ) default {
} ;
@AliasFor (
annotation = ComponentScan . class ,
attribute = "basePackages"
)
String [ ] scanBasePackages ( ) default {
} ;
@AliasFor (
annotation = ComponentScan . class ,
attribute = "basePackageClasses"
)
Class < ? > [ ] scanBasePackageClasses ( ) default {
} ;
@AliasFor (
annotation = ComponentScan . class ,
attribute = "nameGenerator"
)
Class < ? extends BeanNameGenerator > nameGenerator ( ) default BeanNameGenerator . class ;
@AliasFor (
annotation = Configuration . class
)
boolean proxyBeanMethods ( ) default true ;
}
package org. springframework. boot ;
import java. lang. annotation. Documented ;
import java. lang. annotation. ElementType ;
import java. lang. annotation. Retention ;
import java. lang. annotation. RetentionPolicy ;
import java. lang. annotation. Target ;
import org. springframework. context. annotation. Configuration ;
import org. springframework. core. annotation. AliasFor ;
import org. springframework. stereotype. Indexed ;
@Target ( {
ElementType . TYPE } )
@Retention ( RetentionPolicy . RUNTIME )
@Documented
@Configuration
@Indexed
public @interface SpringBootConfiguration {
@AliasFor (
annotation = Configuration . class
)
boolean proxyBeanMethods ( ) default true ;
}
package org. springframework. boot. autoconfigure ;
import java. lang. annotation. Documented ;
import java. lang. annotation. ElementType ;
import java. lang. annotation. Inherited ;
import java. lang. annotation. Retention ;
import java. lang. annotation. RetentionPolicy ;
import java. lang. annotation. Target ;
import org. springframework. context. annotation
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