spring boot入門練習小結
阿新 • • 發佈：2018-12-25
小案例：（期間遇到的bug在程式碼相應位置都有註釋）
專案結構
pom.xml
pom.xml <?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>com.imooc</groupId> <artifactId>girl</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>girl</name> <description>Demo project for Spring Boot</description> <!-- 父工程裡描述了相關的依賴及版本號 --> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.4.1.RELEASE</version> <relativePath/> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
整個工程的啟動類：
/**
* --------要放在Controller的上一層，不然not mapping -----------
* Hello world!
* 啟動整個應用
*/
@SpringBootApplication
public class App
{
public static void main( String[] args )
{
SpringApplication.run(App.class, args);
}
}import java.util.List;
import javax.validation.Valid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.oliver.springbootpra.entity.Animal;
import com.oliver.springbootpra.repository.AnimalRepository;
@RestController
@RequestMapping("/animal")
public class AnimalController {
//注入持久化類，利用JPA
//定義持久化介面AnimalRepository extends JpaRepository<Animal, Integer> @Entity
public class Animal {
@Id
@GeneratedValue
private Integer id;
@NotEmpty(message="名字不能為空")
private String name;
private String color;
// animal的持久化介面
public interface AnimalRepository extends JpaRepository<Animal, Integer>{ //泛型：第一個是實體類，第二個是主鍵的型別
// 擴充套件方法：根據color查詢
//---方法名要符合 findByXX---
List<Animal> findByColor(String color);
}
配置檔案：
application.yml
spring:
profiles:
# 多環境配置
active: dev
# active: prod 上線時使用的配置
# 強制使用預設編碼(UTF-8)
http:
encoding:
force: true
# 公共配置
# 配置資料庫
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1/pra?useUnicode=true&characterEncoding=utf-8
username: root
password: root
# 配置jpa
jpa:
hibernate:
ddl-auto: update # 可選值： update,create,create-drop,none,validate
show-sql: true # 注意縮排，錯了不會報錯，也沒效果Application-dev.xml
server:
port: 8083 # 修改內建埠號Application-prod.xml
server:
port: 8083 # 修改內建埠號
切面:
package com.oliver.springbootpra.aspect;
import javax.servlet.http.HttpServletRequest;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
/**
* aop
* 1. 現在pom中引入spring-boot-starter-aop的依賴
* 2. 如下，新建一個類，@Aspect，@Before...
* @author oliver
*/
@Aspect
@Component
public class HttpAspect {
//獲取日誌輸出物件
private static final Logger logger = LoggerFactory.getLogger(HttpAspect.class);
@Pointcut("execution(* com.oliver.springbootpra.controller.*.*(..))")
public void pointCut(){
}
/**
* 業務方法執行前
* @param joinPoint 用來獲取請求的類名，方法名，引數
*/
@Before("pointCut()")
public void beforeExec(JoinPoint joinPoint){
System.out.println("beforeExec..");
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
//url
logger.info("url={}",request.getRequestURL());
//method
logger.info("method={}",request.getMethod());
//ip
logger.info("ip={}",request.getRemoteAddr());
//類方法
logger.info("類名.方法名"+joinPoint.getSignature().getDeclaringTypeName()+"."+joinPoint.getSignature().getName());
//引數
logger.info("引數"+joinPoint.getArgs());
}
/**
* 業務方法執行後
*/
@After("pointCut()")
public void afterExec(){
System.out.println("afterExec..");
}
/**
*
* @param object 業務方法執行後返回的結果
*/
@AfterReturning(returning="object",pointcut="pointCut()")
public void doAfterReturning(Object object){
logger.info("args={}",object.toString());
}
}補充：
問題1：本來專案可以執行，但在新增parent節點後啟動失敗
No active profile set, falling back to default profiles: default
原因：
1. .m2裡的jar包沒有下完全，刪了，然後update project
問題2：對於html檔案可以訪問，但Controller方法一直訪問不到，提示Whitelabel Error Page
原因：
1. 專案的啟動類放錯了位置，應當放在Controller註解的上一層，具體不是很懂，請指教
自定義持久化介面，配置檔案那裡多看幾遍
基本入門了，後面就該買書加深對細節的理解了。
參考：慕課網廖師兄：https://gitee.com/liaoshixiong/girl，感謝分享
看到個：http://blog.csdn.net/rickiyeat/article/details/77543445