为什么保存之后找不到ppt了呢(保存的ppt找不到)
941
2022-05-30
spring boot2.x已经出来好一阵了,而且spring cloud 的最新Release版本Finchley.RELEASE,默认集成的就是spring boot 2.x,这几天将一个旧项目尝试着从低版本升级到 2.x,踩坑无数,记录一下:
一、gradle的问题
spring boot 2.x 要求gradle版本不能太旧,先把gradle升级到4.6版本,然后编译,各种问题,到gradle官网上查了下,build.gradle有几个小地方要调整
1.1 java-libary 的项目
即:纯工具包这种公用jar,plugins{}必须放在第1行(有buildscript的除外),类似:
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plugins {
id 'java-library'
}
然后按官网的教程,compile最好换成implementation
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dependencies {
implementation(
...
)
}
1.2 常规java项目(指带容器能独立运行的项目)
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buildscript {
ext {
springBootVersion = '2.0.1.RELEASE'
}
repositories {
maven {
url "http://maven.aliyun.com/nexus/content/groups/public/"
}
...
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}
apply plugin: 'java'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-Management'
dependencyManagement {
imports {
mavenBom 'org.springframework.cloud:spring-cloud-dependencies:Finchley.RELEASE'
}
}
...
另外,gradle 高版本编译时,总会有一行讨厌的提示:
Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0.
编译时,可以加参数:--warning-mode=none 禁止掉,即类似:
gradle build --warning-mode=none -x test
二、依赖jar包版本的问题
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dependencies {
...
implementation(
...
'org.springframework.cloud:spring-cloud-starter-consul-discovery',
'org.springframework.cloud:spring-cloud-starter-consul-config',
'org.springframework.cloud:spring-cloud-starter-bus-kafka',
'org.springframework.cloud:spring-cloud-starter-sleuth',
'org.springframework.cloud:spring-cloud-sleuth-stream:1.3.4.RELEASE',
'org.springframework.cloud:spring-cloud-starter-hystrix:1.4.4.RELEASE',
'org.springframework.cloud:spring-cloud-netflix-hystrix-stream',
'org.springframework.boot:spring-boot-starter-actuator',
'org.springframework.boot:spring-boot-starter-undertow',
'org.springframework.boot:spring-boot-starter-mail',
'org.springframework.boot:spring-boot-starter-jdbc',
'org.springframework.boot:spring-boot-starter-security',
'org.slf4j:slf4j-api:1.7.25',
'ch.qos.logback:logback-core:1.2.3',
'org.thymeleaf:thymeleaf-spring5:3.0.9.RELEASE',
'org.mybatis.spring.boot:mybatis-spring-boot-starter:1.3.1',
'tk.mybatis:mapper-spring-boot-starter:1.2.4',
'com.github.pagehelper:pagehelper-spring-boot-starter:1.2.3'
)
implementation('com.alibaba:druid:1.1.9') {
exclude group: "com.alibaba", module: "jconsole"
exclude group: "com.alibaba", module: "tools"
}
implementation('org.springframework.boot:spring-boot-starter-web') {
exclude module: "spring-boot-starter-tomcat"
exclude module: "spring-boot-starter-jetty"
}
testCompile 'org.springframework.boot:spring-boot-starter-test'
}
其中
'org.springframework.cloud:spring-cloud-sleuth-stream:1.3.4.RELEASE',
'org.springframework.cloud:spring-cloud-starter-hystrix:1.4.4.RELEASE',
这二项必须指定版本号,否则编译不过。(应该最新的2.x版本的jar包,还没上传到中央仓库,无法自动识别依赖),另外pagehelper这个常用的分页组件,也建议按上面的版本来配置,否则运行时,可能会报错。
三、log4j/log4j2的问题
升级到spring boot 2.x后,不管是配置log4j还是log4j2,运行时总是报堆栈溢出的error,换成logback后,启动正常,建议大家尽量采用默认的logback,依赖项的配置参考上面的。
四、DataSourceBuilder类找不到的问题
spring boot 2.x把这个类换了package,所以找不到了,详情见:
https://stackoverflow.com/questions/50011577/spring-boot-2-0-0-datasourcebuilder-not-found-in-autoconfigure-jar
https://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/jdbc/DataSourceBuilder.html
解决办法就是引用: org.springframework.boot:spring-boot-starter-jdbc
同时修改代码import新的package: org.springframework.boot.jdbc.DataSourceBuilder
五、安全性的问题
spring boot 2.x加强了安全性,不管访问什么rest url,默认都要求登录,在application.yml里无法通过配置关闭,只能写代码调整:
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import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
@Configuration
@EnableWebSecurity
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http) throws Exception {
http.authorizeRequests()
.anyRequest()
.permitAll()
.and()
.csrf()
.disable();
}
}
这样,默认所有url都允许访问(如果是暴露在外网的服务,请慎用)
六、各类actuator监控endpoint的路径变化
spring boot 2.x 里,actuator的endpoint默认路径变成/actuator开头,如果要使用以前的风格,放在/根下,可以在applicatino.yml里参考下面的配置:
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management:
...
endpoints:
web:
base-path: /
exposure:
include: "*"
另外/health节点,默认情况下,只能输出很少的信息,详细信息,需要通过配置打开
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management:
...
endpoint:
health:
show-details: always
...
七、${spring.cloud.client.ipAddress} 无法识别
spring cloud 2.x里,${spring.cloud.client.ipAddress} 这个写法不识别,一启动就会报错,尝试了多次,无意发现,把A改成小写,居然可以了:
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spring:
...
application:
name: sr-menu-service:${spring.cloud.client.ipaddress}
感觉这应该是个bug,新版本里估计会修复。
八、MetricWriter、SystemPublicMetrics类找不到的问题
spring boot 2.x里metrics默认换成了micrometer,原来的MetricWriter之类的全干掉了,详情参考官网文档
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management:
metrics:
export:
statsd:
host: 10.0.*.*
port: 8125
flavor: etsy
上面的配置是启用statsd,然后跑起来就能看到效果,见下图
但是与spring boot 1.x相比,并不会直接输出具体值,要看具体值,可以用 http://localhost:8001/metrics/jvm.memory.used
这其中的VALUE中是jvm占用的内存(包括heap + noheap),如果只想看heap区(即:堆上的内存),可以用
http://localhost:8001/metrics/jvm.memory.used?tag=area:heap
同时在grafana里也能看到效果:
注:目前statsd里的前缀无法修改,代码写死的statsd
如果一台机器上部署多个spring cloud 微服务,grafana里就分不出来了(个人估计以后会改进)。
另外,如果希望通过代码获取这些metrics里具体指标值,可以参考下面的代码:
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import io.micrometer.core.instrument.Meter;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Statistic;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.function.BiFunction;
public class MetricsTest extends BaseTest {
private String METRIC_MSG_FORMAT = "Metric >> %s = %d";
@Autowired
private MeterRegistry meterRegistry;
@Test
public void testStatsdConfig() {
String metric = "jvm.memory.used";
Meter meter = meterRegistry.find(metric).meter();
Map
logger.info(String.format(METRIC_MSG_FORMAT, metric, stats.get(Statistic.VALUE).longValue()));
}
private Map
Map
mergeMeasurements(samples, meter);
return samples;
}
private void mergeMeasurements(Map
meter.measure().forEach((measurement) -> samples.merge(measurement.getStatistic(),
measurement.getValue(), mergeFunction(measurement.getStatistic())));
}
private BiFunction
return Statistic.MAX.equals(statistic) ? Double::max : Double::sum;
}
}
九、swagger里WebMvcConfigurerAdapter过时的问题
WebMvcConfigurerAdapter这个类在最新的spring boot里已经被标识为过时,正常用法参考以下:
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import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
/**
* @author yangjunming
* @date 13/10/2017
*/
@Configuration
@EnableSwagger2
public class SwaggerConfig extends WebMvcConfigurationSupport {
@Override
protected void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("swagger-ui.html")
.addResourceLocations("classpath:/META-INF/resources/");
registry.addResourceHandler("/webjars/**")
.addResourceLocations("classpath:/META-INF/resources/webjars/");
}
@Bean
public Docket createRestApi() {
return new Docket(DocumentationType.SWAGGER_2)
.apiInfo(apiInfo())
.select()
.apis(RequestHandlerSelectors.basePackage("sr.service.menu.controller"))
.paths(PathSelectors.any())
.build();
}
private ApiInfo apiInfo() {
return new ApiInfoBuilder()
.title("menu-service online api document")
.description("测试服务")
.contact(new Contact("菩提树下的杨过", "http://yjmyzz.cnblogs.com/", "yjmyzz@126.com"))
.version("1.0.0")
.build();
}
}
附:一些参考文档:
https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.0-Migration-Guide
https://spring.io/blog/2017/09/15/security-changes-in-spring-boot-2-0-m4
https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-Security-2.0
https://docs.spring.io/spring-boot/docs/2.0.4.RELEASE/reference/htmlsingle/#production-ready-metrics-getting-started
https://github.com/pagehelper/pagehelper-spring-boot
Spring Cloud
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