Java杂谈

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JAVA

IDEA

Spring Boot 启动命令行太长

修改文件.idea/workspace.xml

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<component name="PropertiesComponent">
  <property name="dynamic.classpath" value="true" />

反编译

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# https://varaneckas.com/jad/
wget https://varaneckas.com/jad/jad158e.linux.static.zip; \
unzip jad158e.linux.static.zip
jad xxx.class
cat xxx.jad

Java启动参数

JVM参数

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-ea
-Dhttp.proxyPort=12639
-Dhttp.proxyHost=127.0.0.1
-Dhttps.proxyPort=12639
-Dhttps.proxyHost=127.0.0.1
-Xmx400m # JVM最大内存
-Xms300m # JVM初始内存
-Xmn200m # 年轻代内存
-Xss128k # 线程堆栈

Java参数

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--server.port=80
--jasypt.encryptor.password=xxx
--spring.profiles.active=development

Maven

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docker run -it --rm \
    -v "$(pwd)":/usr/src/mymaven \
    -w /usr/src/mymaven \
    maven:3.3-jdk-8 \
    mvn clean install
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# 发布
mvn clean javadoc:jar source:jar deploy

单元测试

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@Import(XxxServiceImpl.class)
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = TestRunner.class)
public class ScriptBizServiceTest {
    @Autowired
    XxxService xxxService;

    @MockBean
    XxxService xxxService;
}
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<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-test</artifactId>
  <scope>test</scope>
</dependency>

源码上传插件

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<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-source-plugin</artifactId>
    <version>3.0.1</version>
    <configuration>
        <attach>true</attach>
    </configuration>
    <executions>
        <execution>
            <phase>compile</phase>
            <goals>
                <goal>jar</goal>
            </goals>
        </execution>
    </executions>
</plugin>

规范

多仓库规范

https://maven.apache.org/guides/mini/guide-multiple-repositories.html

Remote repository URLs are queried in the following order for artifacts until one returns a valid result:

  1. Global settings.xml
  2. User settings.xml
  3. Local POM
  4. Parent POMs, recursively
  5. Super POM

For each of these locations, the repositories within the profiles are queried first in the order outlined at Introduction to build profiles.