监控网站模版,免费seo排名网站,东莞产品网站建设公司,网站seo查询工具服务端程序本质上也只是个Java程序#xff0c;它接收客户端的输入#xff0c;然后将计算处理后的返回值返回给客户端。下面我们就以这个思路开始Java后端之旅吧。
引用Spring Boot库
处理HTTP请求之类的事情#xff0c;我们需要库的帮助。所以第一步我们就把Spring Boot引…服务端程序本质上也只是个Java程序它接收客户端的输入然后将计算处理后的返回值返回给客户端。下面我们就以这个思路开始Java后端之旅吧。
引用Spring Boot库
处理HTTP请求之类的事情我们需要库的帮助。所以第一步我们就把Spring Boot引入进来。 不需要任何工具我们使用maven来管理库依赖这样我们只要写一个pom.xml就好了。我们先写一个最简的pom.xml。主要是定义groupId比如是我司还有artifactId就是应用的具体名字
?xml version1.0 encodingUTF-8?
project xmlnshttp://maven.apache.org/POM/4.0.0xmlns:xsihttp://www.w3.org/2001/XMLSchema-instancexsi:schemaLocationhttp://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsdmodelVersion4.0.0/modelVersiongroupIdcn.alios.system.service.prefix/groupIdartifactIdPrefix/artifactIdversion1.0.0-SNAPSHOT/version/project
添加父引用
类似于类的继承我们不是从头开发而是继承Spring Boot Starter框架。添加parent的内容如下 parentgroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-parent/artifactIdversion2.1.2.RELEASE/version/parent
2.1.2是本文写作时Spring Boot的最新版本。
增加依赖
为了自动下载库我们将需要的几个库添加到pom.xml中的依赖项中。这样maven就可以帮我们从仓库中下载最新的库代码。 我们需要AOP和Web两个包用全名是spring-boot-starter-aop和spring-boot-starter-web: dependenciesdependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-aop/artifactId/dependencydependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-web/artifactId/dependency/dependencies
引用插件
Spring Boot还提供了插件我们也将其引用进来 buildpluginsplugingroupIdorg.springframework.boot/groupIdartifactIdspring-boot-maven-plugin/artifactId/plugin/plugins/build
主函数
库引用完了我们就写一个主程序吧。按照惯例我们将其保存在src/main/java目录下
package cn.alios.system.service.prefix;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;SpringBootApplication
RequestMapping(/)
public class Prefix {RequestMapping(/)ResponseBodypublic String home(){return Hello, Java Web World!;}public static void main(String[] args) throws Exception{SpringApplication.run(Prefix.class,args);}
}
编译
下面我们用mvn package命令来编译生成可运行的jar包
mvn package
输出类似于下面这样
[INFO] Scanning for projects...
[INFO]
[INFO] --------------- cn.alios.system.service.prefix:Prefix ----------------
[INFO] Building Prefix 1.0.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) Prefix ---
[INFO] Using UTF-8 encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.8.0:compile (default-compile) Prefix ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to /Users/ziyingliuziying/working/gitlab/Prefix/target/classes
[INFO]
[INFO] --- maven-resources-plugin:3.1.0:testResources (default-testResources) Prefix ---
[INFO] Using UTF-8 encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /Users/ziyingliuziying/working/gitlab/Prefix/src/test/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.8.0:testCompile (default-testCompile) Prefix ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-surefire-plugin:2.22.1:test (default-test) Prefix ---
[INFO] No tests to run.
[INFO]
[INFO] --- maven-jar-plugin:3.1.1:jar (default-jar) Prefix ---
[INFO] Building jar: /Users/ziyingliuziying/working/gitlab/Prefix/target/Prefix-1.0.0-SNAPSHOT.jar
[INFO]
[INFO] --- spring-boot-maven-plugin:2.1.2.RELEASE:repackage (repackage) Prefix ---
[INFO] Replacing main artifact with repackaged archive
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.462 s
[INFO] Finished at: 2019-01-31T16:53:4808:00
[INFO] ------------------------------------------------------------------------
最后生成的包是target/Prefix-1.0.0-SNAPSHOT.jar。
运行
调用java -jar target/Prefix-1.0.0-SNAPSHOT.jar命令运行这个Java程序输出如下
. ____ _ __ _ _/\\ / ____ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | _ | _| | _ \/ _ | \ \ \ \\\/ ___)| |_)| | | | | || (_| | ) ) ) ) |____| .__|_| |_|_| |_\__, | / / / /|_||___//_/_/_/:: Spring Boot :: (v2.1.2.RELEASE)2019-01-31 16:59:43.144 INFO 95879 --- [ main] cn.alios.system.service.prefix.Prefix : Starting Prefix v1.0.0-SNAPSHOT on ziyingliuziyingdeMacBook-Pro.local with PID 95879 (/Users/ziyingliuziying/working/gitlab/Prefix/target/Prefix-1.0.0-SNAPSHOT.jar started by ziyingliuziying in /Users/ziyingliuziying/working/gitlab/Prefix)
2019-01-31 16:59:43.148 INFO 95879 --- [ main] cn.alios.system.service.prefix.Prefix : No active profile set, falling back to default profiles: default
2019-01-31 16:59:44.289 INFO 95879 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2019-01-31 16:59:44.325 INFO 95879 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-01-31 16:59:44.325 INFO 95879 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.14]
2019-01-31 16:59:44.347 INFO 95879 --- [ main] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/Users/ziyingliuziying/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.]
2019-01-31 16:59:44.435 INFO 95879 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-01-31 16:59:44.435 INFO 95879 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1234 ms
2019-01-31 16:59:44.665 INFO 95879 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService applicationTaskExecutor
2019-01-31 16:59:44.886 INFO 95879 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path
2019-01-31 16:59:44.889 INFO 95879 --- [ main] cn.alios.system.service.prefix.Prefix : Started Prefix in 2.161 seconds (JVM running for 2.561)
我们可以看到启动了一个9.0.14版本的Apache Tomcat服务器在8080端口上监听。
我们打开浏览器访问http://127.0.0.1:8080/可以看到『Hello, Java Web World!』这个字符串被显示出来。
再写一个Controller
在主函数里面可以处理请求那么再其它类里面该如何做呢我们通过写Controller注解加上RequestMapping来指定路径就可以了。 我们来写个例子
package cn.alios.system.service.prefix.controller;import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;Controller
RequestMapping(/test)
public class TestController {RequestMapping(/)ResponseBodypublic String test(){return Test Controller!;}
}
还是mvn package然后java -jar java -jar target/Prefix-1.0.0-SNAPSHOT.jar。 在浏览器里试下http://127.0.0.1:8080/test/显示『Test Controller!』 大功告成现在整个从接收输入到显示输出的通道已经打通是不是很easy? 原文链接 本文为云栖社区原创内容未经允许不得转载。
