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【TS】讀官方文檔,學原味技術。
本文是接《【讀官方文檔,學原味技術】SpringBoot-Staters和自定義Starter》官方文檔翻譯的〔案例〕篇:手把手完成自定義Starter(日誌+參數)。
環境 | 版本 |
---|---|
java jdk | 1.8.0_191 |
dea | 2018.3 |
maven | 3.6.3 |
spring boot | 2.2.2.RELEASE |
項目運行結果截圖
Just do it !
- Part 1:自定義Starter
- 新建 maven 工程
- 實現自定義配置功能
- 添加 pom 依賴
- 實現註解開發日誌功能
- 添加自動配置
- 添加 META-INF 自動配置的註冊
- 打包安裝到本地 maven 倉庫
- Part 2:新建 測試工程
- 新建測試工程
- 引入自定義Starter
- 添加測試代碼
- 測試功能
Let`s Go !
Part 1:自定義Starter
新建 maven 工程
修改項目結構,刪除無用目錄和文件,添加如圖示的文件。
添加 pom 依賴
<?xml version="1.0" encoding="UTF-8"?>
<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>site.okliu</groupId>
<artifactId>mylog-spring-boot-starter</artifactId>
<version>1.1-SNAPSHOT</version>
<name>mylog-spring-boot-starter</name>
<url>http://okliu.site</url>
<packaging>jar</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<version>2.2.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
<version>2.2.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<version>2.2.2.RELEASE</version>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.2.2.RELEASE</version>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.10</version>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.62</version>
<optional>true</optional>
</dependency>
</dependencies>
</project>
實現自定義配置功能
- MyLogProperties
package site.okliu.mylog.properties;
import lombok.Getter;
import lombok.Setter;
import org.springframework.boot.context.properties.ConfigurationProperties;
@Getter
@Setter
// prefix 後面在spring.properties中使用時的前綴名稱
@ConfigurationProperties(prefix = "okliu.mylog")
public class MyLogProperties {
// 日誌標記前綴
private String prefix;
}
實現註解開發日誌功能
-MyLogInterceptor攔截器
package site.okliu.mylog.interceptor;
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import site.okliu.mylog.annotation.MyLog;
import site.okliu.mylog.properties.MyLogProperties;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;
// 聲明原作者代碼引自:https://www.cnblogs.com/cjsblog/p/10926408.html
// 加入了自定義配置myLogProperties,以及BUG修復 if (handler instanceof HandlerMethod)
@Slf4j
public class MyLogInterceptor implements HandlerInterceptor {
private static final ThreadLocal<Long> startTimeThreadLocal = new ThreadLocal<>();
private MyLogProperties myLogProperties;
public MyLogInterceptor(MyLogProperties myLogProperties) {
this.myLogProperties = myLogProperties;
}
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
if (handler instanceof HandlerMethod) {
HandlerMethod handlerMethod = (HandlerMethod) handler;
Method method = handlerMethod.getMethod();
MyLog myLog = method.getAnnotation(MyLog.class);
if (null != myLog) {
long startTime = System.currentTimeMillis();
startTimeThreadLocal.set(startTime);
}
}
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
if (handler instanceof HandlerMethod) {
HandlerMethod handlerMethod = (HandlerMethod) handler;
Method method = handlerMethod.getMethod();
MyLog myLog = method.getAnnotation(MyLog.class);
if (null != myLog) {
// 獲取開始時間
long startTime = startTimeThreadLocal.get();
long endTime = System.currentTimeMillis();
long expendTime = endTime - startTime;
// 打印參數
String requestUri = request.getRequestURI();
String methodName = method.getDeclaringClass().getName() + "#" + method.getName();
String methodDesc = myLog.desc();
String parameters = JSON.toJSONString(request.getParameterMap());
String prefix = myLogProperties.getPrefix() == null ? "" : myLogProperties.getPrefix()+"-";
log.info("\n描述:{}{}\n路徑: {}\n方法: {}\n參數:{}\n耗時:{}\n", prefix,methodDesc, requestUri, methodName, parameters, expendTime);
}
}
}
}
- MyLog自定義註解
package site.okliu.mylog.annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
// 聲明原作者代碼引自:https://www.cnblogs.com/cjsblog/p/10926408.html
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface MyLog {
/**
* 方法描述
*/
String desc() default "";
}
添加自動配置
- MyLogAutoConfiguration註冊攔截器
package site.okliu.mylog.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import site.okliu.mylog.interceptor.MyLogInterceptor;
import site.okliu.mylog.properties.MyLogProperties;
// 聲明原作者代碼引自:https://www.cnblogs.com/cjsblog/p/10926408.html
// 新增一處,修改一處
// 此時是註冊自定義配置,會在項目啓動時,自動創建MyLogProperties對象
@EnableConfigurationProperties(MyLogProperties.class)
// 此處註解是標明當前是配置類
@Configuration
public class MyLogAutoConfiguration implements WebMvcConfigurer {// 由於需要註冊本例中的攔截器,此時實現接口
// 新增
@Autowired
private MyLogProperties myLogProperties;
@Override
public void addInterceptors(InterceptorRegistry registry) {
// 此處需要在攔截器創建時傳入自定義配置的對象,不然在攔截器中無法使用配置的屬性
registry.addInterceptor(new MyLogInterceptor(myLogProperties));
}
}
添加 META-INF 自動配置的註冊
- 在 spring.factories 添加如下代碼進行自動化註冊,注意 = 後面的 ****(斜槓)
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
site.okliu.mylog.config.MyLogAutoConfiguration
打包安裝到本地 maven 倉庫
- 注意 IDEA 修改 install 命令,具體修改看圖;eclipse 親測正常。
- 雙擊運行
- 查看本地 maven 安裝
- 至此,自定義starter的工作全部結束,下來就是測試和使用
Part 2:新建 測試工程
新建 spring boot 工程
引入自定義Starter
- 刪除無用部分項目結構,添加核心依賴,並配置自定義屬性
- 完整的pom
<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>test-mylog</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>test-mylog</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>site.okliu</groupId>
<artifactId>mylog-spring-boot-starter</artifactId>
<version>1.1-SNAPSHOT</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
添加測試代碼
- HelloController
package com.example.testmylog.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import site.okliu.mylog.annotation.MyLog;
@Controller
@RequestMapping("/hello")
public class HelloController {
@MyLog(desc = "打招呼 sayHello")
@ResponseBody
@RequestMapping("{name}")
public String sayHello(@PathVariable String name){
String content = "say hello to " + name;
return content;
}
@MyLog(desc = "打招呼 sayHi")
@ResponseBody
@RequestMapping("")
public String sayHi(@RequestParam("name") String name){
String content = "say hi to " + name;
return content;
}
}
測試功能
- 此時無法運行,原因是我們在自定義starter中配置的jar包,都屬於可選的,所以到測試項目時,需要重新配置
- 解決辦法,在測試案例的pom中可以引入和自定義starter一樣的jar依賴
- 重新運行,測試正常
- 最終測試項目的pom文件
<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>test-mylog</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>test-mylog</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>site.okliu</groupId>
<artifactId>mylog-spring-boot-starter</artifactId>
<version>1.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.62</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
- THE END !
- END !
- !