标签：erp this 集合 rds android space class scom git
一、SpringBoot简介1.1 原有Spring优缺点分析1.1.1 Spring的优点分析Spring是Java企业版（Java Enterprise Edition，JEE，也称J2EE）的轻量级代替品。无需开发重量级的EnterpriseJavaBean（EJB），Spring为企业级Java开发提供了一种相对简单的方法，通过依赖注入和面向切面编程，用简单的Java对象（Plain Old Java Object，POJO）实现了EJB的功能。1.1.2 Spring的缺点分析虽然Spring的组件代码是轻量级的，但它的配置却是重量级的。一开始，Spring用XML配置，而且是很多XML配置。Spring 2.5引入了基于注解的组件扫描，这消除了大量针对应用程序自身组件的显式XML配置。Spring 3.0引入了基于Java的配置，这是一种类型安全的可重构配置方式，可以代替XML。所有这些配置都代表了开发时的损耗。因为在思考Spring特性配置和解决业务问题之间需要进行思维切换，所以编写配置挤占了编写应用程序逻辑的时间。和所有框架一样，Spring实用，但与此同时它要求的回报也不少。除此之外，项目的依赖管理也是一件耗时耗力的事情。在环境搭建时，需要分析要导入哪些库的坐标，而且还需要分析导入与之有依赖关系的其他库的坐标，一旦选错了依赖的版本，随之而来的不兼容问题就会严重阻碍项目的开发进度。1.2 SpringBoot的概述1.2.1 SpringBoot解决上述Spring的缺点SpringBoot对上述Spring的缺点进行的改善和优化，基于约定优于配置的思想，可以让开发人员不必在配置与逻辑业务之间进行思维的切换，全身心的投入到逻辑业务的代码编写中，从而大大提高了开发的效率，一定程度上缩短了项目周期。1.2.2 SpringBoot的特点为基于Spring的开发提供更快的入门体验开箱即用，没有代码生成，也无需XML配置。同时也可以修改默认值来满足特定的需求提供了一些大型项目中常见的非功能性特性，如嵌入式服务器、安全、指标，健康检测、外部配置等SpringBoot不是对Spring功能上的增强，而是提供了一种快速使用Spring的方式1.2.3 SpringBoot的核心功能
二、基础项目搭建
搭建一个maven项目，之后再其中的 pom.xml 中添加SpringBoot的起步依赖
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.1.RELEASE</version> </parent>
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>
上面看到的spring-boot-starter-xxx就是SpringBoot的起步依赖。SpringBoot通过提供众多起步依赖降低项目依赖的复杂度。起步依赖本质上是一个Maven项目对象模型，定义了对其他库的传递依赖，这些东西加在一起即支持某项功能。很多起步依赖的命名都暗示了他们提供的某种或某类功能
我们还需要配置引导类，如下
package pojo; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class MySpringBootApplication { public static void main(String[] args) { SpringApplication.run(MySpringBootApplication.class); } }
. ____ _ __ _ _ /\\ / ___‘_ __ _ _(_)_ __ __ _ \ \ \ ( ( )\___ | ‘_ | ‘_| | ‘_ \/ _` | \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ‘ |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.0.1.RELEASE) 2020-02-06 14:34:40.487 INFO 517816 --- [ restartedMain] pojo.MySpringBootApplication : Starting MySpringBootApplication on LAPTOP-13GS0P5U with PID 517816 (C:\Users\gaoch\IdeaProjects\quick\target\classes started by gaoch in C:\Users\gaoch\IdeaProjects\quick) 2020-02-06 14:34:40.489 INFO 517816 --- [ restartedMain] pojo.MySpringBootApplication : No active profile set, falling back to default profiles: default 2020-02-06 14:34:40.712 INFO 517816 --- [ restartedMain] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@593192bf: startup date [Thu Feb 06 14:34:40 CST 2020]; root of context hierarchy WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils$1 (file:/C:/Users/gaoch/.m2/repository/org/springframework/spring-core/5.0.5.RELEASE/spring-core-5.0.5.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release 2020-02-06 14:34:47.403 INFO 517816 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http) 2020-02-06 14:34:47.467 INFO 517816 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2020-02-06 14:34:47.468 INFO 517816 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.29 2020-02-06 14:34:47.492 INFO 517816 --- [ost-startStop-1] 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: [D:\JAVA\jdk-10.0.1\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;D:\JAVA\jdk-10.0.1\bin;C:\Users\gaoch\AppData\Local\Programs\Python\Python36-32\Scripts\;C:\Users\gaoch\AppData\Local\Programs\Python\Python36-32\;D:\Scripts\;D:\;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\Git\cmd;C:\Program Files\dotnet\;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files\PuTTY\;D:\apache-maven-3.5.2\bin;D:\maven\apache-maven-3.5.2\bin;D:\Android\android-sdk-windows;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\130\Tools\Binn\;C:\Program Files (x86)\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files\Microsoft SQL Server\130\DTS\Binn\;C:\Program Files (x86)\Microsoft SQL Server\150\DTS\Binn\;C:\Program Files (x86)\GtkSharp\2.12\bin;D:\python\Scripts\;D:\python\;C:\Users\gaoch\AppData\Local\Programs\Python\Python36-32\Scripts\;C:\Users\gaoch\AppData\Local\Programs\Python\Python36-32\;C:\Users\gaoch\AppData\Local\Microsoft\WindowsApps;;C:\Program Files (x86)\SSH Communications Security\SSH Secure Shell;D:\idea\IntelliJ IDEA 2018.3.2\bin;;.] 2020-02-06 14:34:47.883 INFO 517816 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2020-02-06 14:34:47.883 INFO 517816 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 7184 ms 2020-02-06 14:34:48.322 INFO 517816 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/] 2020-02-06 14:34:48.370 INFO 517816 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: ‘characterEncodingFilter‘ to: [/*] 2020-02-06 14:34:48.370 INFO 517816 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: ‘hiddenHttpMethodFilter‘ to: [/*] 2020-02-06 14:34:48.371 INFO 517816 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: ‘httpPutFormContentFilter‘ to: [/*] 2020-02-06 14:34:48.371 INFO 517816 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: ‘requestContextFilter‘ to: [/*] 2020-02-06 14:34:48.930 INFO 517816 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2020-02-06 14:34:49.573 INFO 517816 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@593192bf: startup date [Thu Feb 06 14:34:40 CST 2020]; root of context hierarchy 2020-02-06 14:34:49.835 INFO 517816 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/quick]}" onto public java.lang.String pojo.controller.QuickStartController.quick() 2020-02-06 14:34:49.842 INFO 517816 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest) 2020-02-06 14:34:49.844 INFO 517816 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse) 2020-02-06 14:34:50.003 INFO 517816 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2020-02-06 14:34:50.004 INFO 517816 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2020-02-06 14:34:50.824 INFO 517816 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729 2020-02-06 14:34:50.954 INFO 517816 --- [ restartedMain] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup 2020-02-06 14:34:51.122 INFO 517816 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ‘‘ 2020-02-06 14:34:51.139 INFO 517816 --- [ restartedMain] pojo.MySpringBootApplication : Started MySpringBootApplication in 11.637 seconds (JVM running for 14.557)
在倒数第二行中出现Tomcat started on port(s): 8080 (http) with context path ‘‘
我们在浏览器中出入localhost:8080
出现一下页面就说明SpringBoot的配置没有任何问题
下面，我们要实现Controller层方法的实现，需要在引导类的同级或者是子包中创建才有效
package pojo.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.RestController; @Controller public class QuickStartController { @RequestMapping("/quick") @ResponseBody public String quick() { return "SpringBoot test"; } }
@ResponseBody :注解的作用是将controller的方法返回的对象通过适当的转换器转换为指定的格式之后，写入到response对象的body区，通常用来返回JSON数据或者是XML数据。
注意：在使用此注解之后不会再走视图处理器，而是直接将数据写入到输入流中，他的效果等同于通过response对象输出指定格式的数据。
我们在启动下服务器，并访问 localhost:8080/quick
三、SpringBoot的配置文件
#普通数据 name: GCL #对象 person: name: zhangsan age: 32 addr: 内蒙古 #或者 #persion: {name: haohao,age: 32,addr: 内蒙古} #数组 city: - beijing - shanghai - tianjing - neimenggu #或者 #city: [beijing,shanghai,tianjing,neimenggu] #集合中的元素是对象形式 student: - name: zhangsan age: 18 score: 100 - name: lisi age: 18 score: 100 - name: wangwu age: 18 score: 100
下面演示如何去获取这些值
方法一：
@Value("${name}")
private String name;
@Value("${person.addr}")
private String addr;
@Value("${city[0]}")
private String city;
@Value("${student[0].score}")
private Integer score;
package pojo.controller; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.RestController; @Controller public class QuickStartController { @Value("${name}") private String name; @Value("${person.addr}") private String addr; @Value("${city[0]}") private String city; @Value("${student[0].score}") private Integer score; @RequestMapping("/quick") @ResponseBody public String quick() { return "name:" + name + " " + "addr:" + addr + " " + "city:" + city + " " + "score:" + score; } }
方法二：
通过注解@ConfigurationProperties(prefifix="配置文件中的key的前缀")可以将配置文件中的配置自动与实体进行映射。
package pojo.controller; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; @Controller @ConfigurationProperties(prefix = "person") public class QuickStartController { private String name; private Integer age; private String addr; @RequestMapping("/quick") @ResponseBody public String quick() { ;return "name:" + name + " " + "age" + age + " " + "addr:" + addr; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public String getAddr() { return addr; } public void setAddr(String addr) { this.addr = addr; } }
而配置的属性是需要生生getter和setter方法的，这样就可以通过@ConfigurationProperties注解进行
<!--mybatis起步依赖-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>
<!-- MySQL连接驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
4.1.2 添加数据库连接信息
在 application.properties 文件中添加
#DB Configuration: spring.datasource.driverClassName=com.mysql.jdbc.Driver spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test? useUnicode=true&characterEncoding=utf8 spring.datasource.username=root spring.datasource.password=nixiaozi773963
4.1.3 创建数据库user表
CREATE DATABASE test; USE test; DROP TABLE IF EXISTS `user`; CREATE TABLE `user` ( `id` INT(11) NOT NULL AUTO_INCREMENT, `username` VARCHAR(50) DEFAULT NULL, `password` VARCHAR(50) DEFAULT NULL, `name` VARCHAR(50) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=INNODB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of user -- ---------------------------- INSERT INTO `user` VALUES (‘1‘, ‘zhangsan‘, ‘123‘, ‘张三‘); INSERT INTO `user` VALUES (‘2‘, ‘lisi‘, ‘123‘, ‘李四‘);
4.1.4 创建实体Bean
package pojo.domain; public class User { //主键 private Long id; //用户名 private String username; //密码 private String password; //姓名 private String name; public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
4.1.5 编写Mapper
package pojo.mapper; import org.apache.ibatis.annotations.Mapper; import pojo.domain.User; import java.util.List; @Mapper public interface UserMapper { public List<User> queryUserList(); }
在resources\mapper加入 UserMapper.xml 配置文件
<?xml version="1.0" encoding="utf-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace="pojo.mapper.UserMapper"> <select id="queryUserList" resultType="user"> select * from user </select> </mapper>
4.1.7 在application.properties中添加mybatis的信息
#spring集成Mybatis环境
#pojo别名扫描包
mybatis.type-aliases-package=pojo.domain
#加载Mybatis映射文件
mybatis.mapper-locations=classpath:mapper/*Mapper.xml
最后，编写测试类
package pojo.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.RestController; import pojo.domain.User; import pojo.mapper.UserMapper; import java.util.List; @Controller public class MapperController { @Autowired private UserMapper userMapper; @RequestMapping("/queryList") @ResponseBody public List<User> queryUser() { List<User> users = userMapper.queryUserList(); return users; } }
运行成功，如下
出现数据就是正确的解析结果 我这里是使用了解析json数据的浏览器插件
4.2 SpringBoot整合Junit
4.2.1 添加Junit的起步依赖
<!--测试的起步依赖--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>compile</scope> </dependency>
package pojo.test; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import pojo.MySpringBootApplication; import pojo.domain.User; import pojo.mapper.UserMapper; import java.util.List; @RunWith(SpringRunner.class) @SpringBootTest(classes= MySpringBootApplication.class) public class MapperTest { @Autowired private UserMapper userMapper; @Test public void Test() { List<User> users = userMapper.queryUserList(); for (User user: users ) { System.out.println(user); } } }
需要在之前写的User类中吧toString()方法实现了
标签：erp this 集合 rds android space class scom git
原文地址：https://www.cnblogs.com/g-cl/p/12269939.html
