1，搭建项目，通过maven
新建项目类型，选择 Spring Initializr
然后配置 包的属性，看起来是个 maven pom 的配置
依赖 选择 Spring Web依赖，这样最后的产出是个 web。。。。
然后项目放哪，测试的先放android下。。。。
然后弹框创建打开项目，开始同步依赖。。。。
经过漫长的下载后，发现项目竟然可以直接运行。。。。
运行报错，Web server failed to start. Port 8080 was already in use.
SENRSL:~ senrsl$ cd j2ee/apache-tomcat-9.0.10/bin/
SENRSL:bin senrsl$ ./shutdown.sh
Using CATALINA_BASE: /Users/senrsl/j2ee/apache-tomcat-9.0.10
Using CATALINA_HOME: /Users/senrsl/j2ee/apache-tomcat-9.0.10
Using CATALINA_TMPDIR: /Users/senrsl/j2ee/apache-tomcat-9.0.10/temp
Using JRE_HOME: /Users/senrsl/Library/Java/JavaVirtualMachines/corretto-11.0.8/Contents/Home
Using CLASSPATH: /Users/senrsl/j2ee/apache-tomcat-9.0.10/bin/bootstrap.jar:/Users/senrsl/j2ee/apache-tomcat-9.0.10/bin/tomcat-juli.jar
NOTE: Picked up JDK_JAVA_OPTIONS: --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED
SENRSL:bin senrsl$
。。。。stop掉独立的Tomcat，再次启动。。。。
看起来是启动成功了，然后访问 网页 404看起来是正常的呢。。。。
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.3.4.RELEASE)
2020-09-27 15:02:47.880 INFO 53253 --- [ main] dc.test.spring.boot.Application : Starting Application on SENRSL with PID 53253 (/Users/senrsl/android/Project/spring_boot/target/classes started by senrsl in /Users/senrsl/android/Project/spring_boot)
2020-09-27 15:02:47.882 INFO 53253 --- [ main] dc.test.spring.boot.Application : No active profile set, falling back to default profiles: default
2020-09-27 15:02:48.501 INFO 53253 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-09-27 15:02:48.508 INFO 53253 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-09-27 15:02:48.509 INFO 53253 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.38]
2020-09-27 15:02:48.569 INFO 53253 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-09-27 15:02:48.569 INFO 53253 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 656 ms
2020-09-27 15:02:48.689 INFO 53253 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-09-27 15:02:48.838 INFO 53253 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2020-09-27 15:02:48.847 INFO 53253 --- [ main] dc.test.spring.boot.Application : Started Application in 1.253 seconds (JVM running for 1.708)
2020-09-27 15:03:02.309 INFO 53253 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2020-09-27 15:03:02.309 INFO 53253 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2020-09-27 15:03:02.314 INFO 53253 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 5 ms
然后打开网页 404
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Sun Sep 27 15:03:02 CST 2020There was an unexpected error (type=Not Found, status=404).
应该是正常的吧。。。。项目里的确没东西。。。。
2，简单实现 webService....
最简单的改一下先
直接修改Application类，增加 @RestController注解和 index方法
package dc.test.spring.boot; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController @SpringBootApplication public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } @RequestMapping("/") public String index() { return "当前显示内容来自" + getClass().getSimpleName(); } }
再次运行，就有内容了。。。。
这么写很糟啊，
好吧，太久不用maven，还是改成gradle。。。。
3，搭建项目，通过gradle
改改这个就好了，其他不变。。。。
经历了更加漫长的等待，快下班了。。。。
这个看起来要清爽一些。。。。
这个的入口类竟然自动变成了 模块名+Application，比刚才那个好多了。。。。
依然是直接就可以运行。。。。
4，简单实现 webService....
按网上各种demo一直405，找了半天，发现 doGet注释掉 super.doGet()就好了。。。。
SENRSL:Downloads senrsl$ curl 'http://localhost:8080/test01?name=aaaa'
{"timestamp":"2020-09-27T08:32:33.972+00:00","status":405,"error":"Method Not Allowed","message":"","path":"/test01"}
SENRSL:Downloads senrsl$ curl 'http://localhost:8080/test01?name=aaaa'
Test01HttpServlet name=aaaa welcome!!!SENRSL:Downloads senrsl$
终于换个页面
然后看了下super.doGet的实现
/** * Called by the server (via the <code>service</code> method) to * allow a servlet to handle a GET request. * * <p>Overriding this method to support a GET request also * automatically supports an HTTP HEAD request. A HEAD * request is a GET request that returns no body in the * response, only the request header fields. * * <p>When overriding this method, read the request data, * write the response headers, get the response's writer or * output stream object, and finally, write the response data. * It's best to include content type and encoding. When using * a <code>PrintWriter</code> object to return the response, * set the content type before accessing the * <code>PrintWriter</code> object. * * <p>The servlet container must write the headers before * committing the response, because in HTTP the headers must be sent * before the response body. * * <p>Where possible, set the Content-Length header (with the * {@link javax.servlet.ServletResponse#setContentLength} method), * to allow the servlet container to use a persistent connection * to return its response to the client, improving performance. * The content length is automatically set if the entire response fits * inside the response buffer. * * <p>When using HTTP 1.1 chunked encoding (which means that the response * has a Transfer-Encoding header), do not set the Content-Length header. * * <p>The GET method should be safe, that is, without * any side effects for which users are held responsible. * For example, most form queries have no side effects. * If a client request is intended to change stored data, * the request should use some other HTTP method. * * <p>The GET method should also be idempotent, meaning * that it can be safely repeated. Sometimes making a * method safe also makes it idempotent. For example, * repeating queries is both safe and idempotent, but * buying a product online or modifying data is neither * safe nor idempotent. * * <p>If the request is incorrectly formatted, <code>doGet</code> * returns an HTTP "Bad Request" message. * * @param req an {@link HttpServletRequest} object that * contains the request the client has made * of the servlet * * @param resp an {@link HttpServletResponse} object that * contains the response the servlet sends * to the client * * @exception IOException if an input or output error is * detected when the servlet handles * the GET request * * @exception ServletException if the request for the GET * could not be handled * * @see javax.servlet.ServletResponse#setContentType */ protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String msg = lStrings.getString("http.method_get_not_supported"); sendMethodNotAllowed(req, resp, msg); }
好吧，默认都是405.。。。。
然后 doPost:
SENRSL:Downloads senrsl$ curl 'http://localhost:8080/test01?name=aaaa&age=18'
Test01HttpServlet name=aaaa&age=18 welcome!!!
Test01HttpServlet name=aaaa&age=18 welcome!!!aaaaSENRSL:Downloads senrsl$
SENRSL:Downloads senrsl$
SENRSL:Downloads senrsl$ curl -d 'name=bbbb&age=16' -X POST http://localhost:8080/test01
Test01HttpServlet null welcome!!!
Test01HttpServlet null welcome!!!bbbbSENRSL:Downloads senrsl$
当然，茴字有四种写法。。。。
收拾收拾放假了！！！
2020年09月27日16:58:44
x. 缩写回顾
pom: Project Object Model，项目对象模型。
JPA: Java Persistence API，Java持久化API。
source: https://github.com/senRsl/TestSpringBoot
senRsl
2020年09月27日14:25:25
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