搭建一個很是簡單的springboot項目,只有圖片訪問的功能。springboot項目其實很靈活,能夠打成jar包運行,靜態資源的路徑也能夠隨意配置,也能夠打成war包配合tomcat運行。前端
1. 新建maven項目,初始架構爲:java
2. 引進springboot,補充pom文件:web
<?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.yue</groupId> <artifactId>springboot-picture</artifactId> <version>1.0-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.10.RELEASE</version> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies> </project>
3. resources下新建文件application.propertiesspring
server.port=8080 server.tomcat.basedir=./tomcatTemp
設置tomcat臨時目錄的緣由是,我不想讓太多垃圾堆積在c盤。tomcat啓動時,會默認在C盤的一個位置生成臨時目錄,存儲大量的臨時文件。消耗系統物理內存,我但願把這些消耗掌握在更明顯的可控範圍內。apache
4. java包下新建com.yue,yue包下新建Application.class,做爲springboot的啓動類tomcat
@SpringBootApplication(scanBasePackages={"com.yue"}) public class Application { public static void main(String[] args) { SpringApplication.run(Application.class); } }
scanBasePackages={"com.yue"} 這一句是配置啓動類的所在包路徑
此時,最基本的springboot框架已經搭建,運行Application類就能夠啓動了springboot
控制檯輸出架構
2018-06-21 16:12:40.729 INFO 11780 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http) 2018-06-21 16:12:40.738 INFO 11780 --- [ main] com.yue.Application : Started Application in 3.78 seconds (JVM running for 4.346)
說明啓動成功。app
5. 增長圖片訪問功能,這個圖片訪問不是把圖片放到靜態資源路徑下,而後用 http://ip:port/圖片名 的方式訪問,而是直接在前端請求過來時,將本地的圖片轉化成二進制流寫入response,響應給前端頁面。框架
新建相關類
@Service public class ImageService { private final String IMAGE_PATH="F:/150094541085.jpg"; public byte[] getImage() throws IOException { FileInputStream fileInputStream = null; byte[] data =null; try { fileInputStream = new FileInputStream(IMAGE_PATH); //適合小容量文件 data = new byte[fileInputStream.available()]; fileInputStream.read(data); } catch (FileNotFoundException e) { e.printStackTrace(); } return data; } }
@Controller public class ImageController { @Autowired private ImageService imageService; @GetMapping("/getImage") public void getImage(HttpServletResponse response) throws IOException { response.setHeader("Pragma", "no-cache"); response.setContentType("image/jpeg"); byte[] image = imageService.getImage(); response.getOutputStream().write(image); response.flushBuffer(); } }
此時,啓動項目,輸入 http://localhost:8081/getImage 便能訪問本地圖片了
6. 可是這樣子還沒辦法打包運行,須要繼續修改pom文件,添加如下代碼
<build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.6.1</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <version>1.5.10.RELEASE</version> <executions> <execution> <goals> <goal>repackage</goal> </goals> </execution> </executions> </plugin> </plugins> </build>
這樣子,用maven命令 clean 、package 打包就好了。
運行jar包的命令
java -Dfile.encoding=UTF-8 -jar ./xxx.jar