how to create a simple springboot project?

1. using maven project using maven-archetype-quickstart
2. import parent project in pom file
3. create main-function annotationed with @SpringBootApplication
4. import spring-boot-maven-plugin plugin in pom file

project structrue

• src/main/java is srource folder
• test/main/java is test folder
• pom.xml is maven configration

How to design restfull interface?

1. import spring-boot-starter-web dependence in pom file
2. create controller annotationed with @RestController
3. coding restfull interface annotationed with @RequestMapping
4. mvn package
5. run project using commond 'java -jar springboot-1.0-SNAP SHOT.jar'
6. curl 'http://127.0.0.1:8080/index'

Mock with MockMvc to initiate the http request, which is actually a class method call, then execute the controller, using Mockito's mock to mock the return of the underlying data during the execution, and finally validate the result.

How to junit test?

1. import spring-boot-starter-test dependence in pom file
2. create test class in src/test folder annotationed with @RunWith @SpringBootTest @AutoConfigureMockMvc
3. coding test function

junit interpretation

• @RunWith is used for running test
• @SpringBootTest is used for statementing springboot test
• @AutoConfigureMockMvc is used for autowiring beans

jwt is json web token How to integrate springsecurity and jwt?

1. import spring-boot-starter-security and jjwt in pom file
2. new application.properties is using for configing jwt params
3. new WebSecurityConfig.java using for security config,such as handler class,url without token, auth filter,generate UserDetail
4. hanlers contains MyAuthenticationFailHandler.java MyAuthenticationSuccessHandler.java MyaccessDeniedHandler.java MyAuthenticationEntryPointHandler.java MyLogoutSuccessHandler.java
5. new UserDetailsServiceImpl.java is using for loading auth and new SecurityUserDetails.java is using for wrapping auth
6. JWTAuthenticationFilter.java is using for checking token as filter
7. other custom class,BaseException.java JwtTokenUtil.java
8. SecuticyController.java is useing defining interface

How to test jwt?

1. curl -X POST 'http://127.0.0.1/security/login' -d 'username=grandhappy&password=123456

 {
      "data": "Bearer eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJncmFuZGhhcHB5IiwianRpIjoiMiIsImF1dGhvcml0aWVzIjoiW3tcImF1dGhvcml0eVwiOlwiY29tbW9uXCJ9XSIsImV4cCI6MTU1NzMyNzI4OH0.Ekf5MmXJA9EqKd6gVTbUbtlcLZ27qvcCU9Ph01Zuhx36BK-cCabj9krIY_C0yZsWP6J-lz_UT3TV7vMdS3D8sA",
      "message": "登录成功",
      "status": 200
  }

2. curl -X GET http://127.0.0.1/security/noauth

 noauth

3. curl -X GET 'http://127.0.0.1/security/needauth' -H 'accessToken:Bearer eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJncmFuZGhhcHB5IiwianRpIjoiMiIsImF1dGhvcml0aWVzIjoiW3tcImF1dGhvcml0eVwiOlwiY29tbW9uXCJ9XSIsImV4cCI6MTU1NzMyNzI4OH0.Ekf5MmXJA9EqKd6gVTbUbtlcLZ27qvcCU9Ph01Zuhx36BK-cCabj9krIY_C0yZsWP6J-lz_UT3TV7vMdS3D8sA'

 needauth

4. curl -X GET 'http://127.0.0.1/security/needauth' -H 'accessToken:Bearer eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJncmFuZGhhcHB5IiwianRpIjoiMiIsImF1dGhvcml0aWVzIjoiW3tcImF1dGhvcml0eVwiOlwiY29tbW9uXCJ9XSIsImV4cCI6MTU1NzMyNzI4OH0.Ekf5MmXJA9EqKd6gVTbUbtlcLZ27qvcCU9Ph01Zuhx36BK-cCabj9krIY_C0yZsWP6J-lz_UT3TV7vMdS3D8sA'"

 {
      "message": "认证失败，无法访问该资源",
      "status": 401
 }

5. request needauth interface with wrong accessToken using commond "curl -X GET 'http://127.0.0.1/security/needauth' -H 'accessToken:xxx.xxx.xxx'"

 {
      "message": "token invalid",
      "status": 401
 }

Before the second step,we only need token to send the request.Interface permissions are ignored, so this step we need access control.Permissions are controlled according to roles. How to add permissions control?

1. new MyAccessDecisionManager.java is using for loading permissions
2. new MyAccessDecisionMnaager.java is using for checking permisions by every request
3. new MyFilterSecurityInterceptor.java is using for intercepting request as a filter
4. coding '/security/manager' and '/securty/common' mapping interface in SecuticyController.java How to test permissions?
5. curl -X POST 'http://127.0.0.1/security/login' -d 'username=grandhappy&password=123456'

{
    "data": "Bearer eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJncmFuZGhhcHB5IiwianRpIjoiMiIsImF1dGhvcml0aWVzIjoiW3tcImF1dGhvcml0eVwiOlwiY29tbW9uXCJ9XSIsImV4cCI6MTU1NzMyNzI4OH0.Ekf5MmXJA9EqKd6gVTbUbtlcLZ27qvcCU9Ph01Zuhx36BK-cCabj9krIY_C0yZsWP6J-lz_UT3TV7vMdS3D8sA",
    "message": "登录成功",
    "status": 200
}

2. curl -X GET 'http://127.0.0.1/security/manager' -H 'accessToken:Bearer eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJhZG1pbiIsImp0aSI6IjEiLCJhdXRob3JpdGllcyI6Ilt7XCJhdXRob3JpdHlcIjpcImFkbWluXCJ9LHtcImF1dGhvcml0eVwiOlwiY29tbW9uXCJ9XSIsImV4cCI6MTU1NzM5NTY4Nn0.VHAQZEkrJKcDAmIRM0-iEb8O5nKDmKy6eXAC7lvTlV99w8h5MaJfa3cV_nIRISkYMqonHfrFtDhV8SdWkH4Zng'

 {
    "message":"权限不足，无法访问该资源",
    "status":402
  }

3. curl -X POST 'http://127.0.0.1/security/login' -d 'username=admin&password=123456'

 {
    "data": "Bearer eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJncmFuZGhhcHB5IiwianRpIjoiMiIsImF1dGhvcml0aWVzIjoiW3tcImF1dGhvcml0eVwiOlwiY29tbW9uXCJ9XSIsImV4cCI6MTU1NzMyNzI4OH0.Ekf5MmXJA9EqKd6gVTbUbtlcLZ27qvcCU9Ph01Zuhx36BK-cCabj9krIY_C0yZsWP6J-lz_UT3TV7vMdS3D8sA",
    "message": "登录成功",
    "status": 200
 }

4. curl -X GET 'http://127.0.0.1/security/manager' -H 'accessToken:Bearer eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJhZG1pbiIsImp0aSI6IjEiLCJhdXRob3JpdGllcyI6Ilt7XCJhdXRob3JpdHlcIjpcImFkbWluXCJ9LHtcImF1dGhvcml0eVwiOlwiY29tbW9uXCJ9XSIsImV4cCI6MTU1NzM5NTY4Nn0.VHAQZEkrJKcDAmIRM0-iEb8O5nKDmKy6eXAC7lvTlV99w8h5MaJfa3cV_nIRISkYMqonHfrFtDhV8SdWkH4Zng'

 security manager

Before the third step,request '/security/needauth' interface do not required any permissions.
How to solve this bugs???

  Latter to resolve

Swagger is a platform for API Design and Documentation with OpenAPI How to integrate swagger?

1. import sspringfox-swagger2 and springfox-swagger-ui in pom file
2. new Swagger2Config.java is using for configing swagger
3. new SwaggerController.java using for defining swagger interface
4. add swagger-mappings without jwt and permissions checking in application.properties

How to test swagger?

entry http://localhost/swagger-ui.html in your brower

exception handling returns the predefined exception in a uniform handling format How to integrate exception handling?

1. new MyExceptionAdvice.java is using for intercepting self-define exception and returning
2. new sefl-define exceptions,such as ParamErrorException.java,NotExistException.java and so on
3. new ResultEnum.java for define exception types
4. new Result.java for packaging return model
5. new ExceptionController.java using for exception hadnling interface
6. add '/exception/**' url-mapping without jwt and permissions checking in application.properties

How to test exception?

1. curl -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' 'http://localhost:8080/exception/login?username=runtime&password=123456'

 {
    "code": 500,
    "message": "系统异常"
 }

2. curl -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' 'http://localhost:8080/exception/login?username=param&password=123456'

 {
    "code": 400,
    "message": "用户名错误，请输入admin"
 }

3. curl -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' 'http://localhost:8080/exception/login?username=notexist&password=123456'

 {
     "code": 404,
     "message": "用户不存在"
 }

4. curl -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' 'http://localhost:8080/exception/login?username=admin&password=123456'

 {
  "code": 200,
  "message": "登录成功",
  "data": {
          "id": 1,
          "name": "admin",
          "password": "123456",
          "status": 1,
          "roles": null
          }
  }

devtools is a developer auto-compile tools,when you modify a java or html without compile you program. you do not restart your project.

how to import devtools?

1. import spring-boot-devtools in your pom file
2. config spring.devtools.start.enable param in your application.properties

how to test?

1. curl http://127.0.0.1:8080/index

 hello world

2. modify return result to 'hello new world' in IndexController.java
3. after 5s, curl http://127.0.0.1/index

 hello new world

Project Lombok is a java library that automatically plugs into your editor and build tools, spicing up your java. Never write another getter or equals method again, with one annotation your class has a fully featured builder, Automate your logging variables, and much more.

how to import lombok?

1. import spring-boot-devtools in your pom file
2. create domain object Lombok.java with @Getter,@Setter@Getter without writing function setter() and getter()
3. create LombokController.java to test

how to test?

1. curl http://127.0.0.1:8080/lombok

{
 "username": "lucy",
 "age": 13
 }

main points

• @Getter and @Setter
• @NonNull
• @ToString
• @EqualsAndHashCode
• @Data
• @Cleanup
• @Synchronized
• @SneakyThrows

Spring Data JPA, part of the larger Spring Data family, makes it easy to easily implement JPA based repositories. This module deals with enhanced support for JPA based data access layers. It makes it easier to build Spring-powered applications that use data access technologies.

Jpa is not orm framework,this is a specification for operate db.

how to import jpa?

1. import dependence in pom, contains spring-boot-starter-data-jpa and mysql-connector-java.
2. config db info,jpa info,connection pool info in application.properties
3. code UserRepository extends JpaRepository interface
4. code JpaController to test
5. create User entity mapping table user in db
6. create table in db

CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) CHARACTER SET latin1 DEFAULT NULL,
  `password` varchar(255) CHARACTER SET latin1 DEFAULT NULL,
  `status` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8;

how to test?

1. curl -X POST http://127.0.0.1:8080/jpa/user -d 'name=tom&password=123456'

{
    "id":11,
    "name":"tom",
    "password":"123456",
    "status":1
 }

2. curl -X DELETE http://127.0.0.1:8080/jpa/user -d 'id=9'

success

3. curl -X PUT http://127.0.0.1:8080/jpa/user -d 'id=8&name=tomcat'

{
      "id":8,
      "name":"tomcat",
      "password":"123456",
      "status":1
   }

how to query by columns?

1. code jpa supplying method name in UserRespository.java
2. code JpaController to test

how to test?

1. insert example record into db

   DELETE FROM `test`.`user`;
   INSERT INTO `test`.`user` (`id`, `name`, `password`, `status`) VALUES ('1', 'hbase', '123456', '0');
   INSERT INTO `test`.`user` (`id`, `name`, `password`, `status`) VALUES ('2', 'hbase', '111111', '1');
   INSERT INTO `test`.`user` (`id`, `name`, `password`, `status`) VALUES ('3', 'access', '123321', '0');
   INSERT INTO `test`.`user` (`id`, `name`, `password`, `status`) VALUES ('4', 'postgresql', '123321', '0');
   INSERT INTO `test`.`user` (`id`, `name`, `password`, `status`) VALUES ('5', 'oracle', '222222', '0');
   INSERT INTO `test`.`user` (`id`, `name`, `password`, `status`) VALUES ('6', 'mongo', '654321', '0');
   INSERT INTO `test`.`user` (`id`, `name`, `password`, `status`) VALUES ('7', 'redis', '000000', '0');
   INSERT INTO `test`.`user` (`id`, `name`, `password`, `status`) VALUES ('8', 'mysql', '666666', '2');
   
   

2. curl -X GET http://127.0.0.1:8080/jpa/user

   the result findByName("hbase") is:[{"id":1,"name":"hbase","password":"123456","status":0},{"id":2,"name":"hbase","password":"111111","status":1}]
   the result findByNameAndStatus("hbase",1) is:[{"id":2,"name":"hbase","password":"111111","status":1}]
   the result findByNameLike("%sql%") is:[{"id":4,"name":"postgresql","password":"123321","status":0},{"id":8,"name":"mysql","password":"666666","status":2}]
   the result findByStatusIn(statusList) is:[{"id":2,"name":"hbase","password":"111111","status":1},{"id":8,"name":"mysql","password":"666666","status":2}]
   

how to query using self-define sql?

1. code jpa self-define method name in UserRespository.java, need to import Query.
2. code /user/native interface to test in JpaController.java.

how to test?

1. curl -X GET http://127.0.0.1:8080/jpa/user/native

   the result findByTwoName("hbase","mysql") is:[{"id":1,"name":"hbase","password":"123456","status":0},{"id":2,"name":"hbase","password":"111111","status":1},{"id":8,"name":"mysql","password":"666666","status":2}]
   

how to use join query?

1. create entity many_to_many relationship in User.java and Role.java
2. UserRespository.java extends JpaSpecificationExecutor.java
3. code UserServiceImpl.java using function findAll(Specification var1)
4. code /user/josin2 interface to test in JpaController.java.

how to test?

1. curl -X GET http://127.0.0.1:8080/jpa/user/join2

   the result joinQuery("admin",1) is:[{"id":2,"name":"hbase","password":"111111","roles":[{"id":1,"name":"admin","users":[{"id":1,"name":"hbase","password":"123456","roles":[{"$ref":"$[0].roles[0]"}],"status":0},{"$ref":"$[0]"},{"id":3,"name":"access","password":"123321","roles":[{"$ref":"$[0].roles[0]"}],"status":0},{"id":4,"name":"postgresql","password":"123321","roles":[{"$ref":"$[0].roles[0]"}],"status":0}]}],"status":1}]
   

MyBatis is a first class persistence framework with support for custom SQL, stored procedures and advanced mappings. MyBatis eliminates almost all of the JDBC code and manual setting of parameters and retrieval of results. MyBatis can use simple XML or Annotations for configuration and map primitives, Map interfaces and Java POJOs (Plain Old Java Objects) to database records website:http://www.mybatis.org/mybatis-3/index.html

how to import mybatis?

1. import dependence in pom, contains mybatis-spring-boot-starter.
2. config mybatis-config.xml in application.properties and writing mybatis-config.xml
3. code UserMapper.java UserMapper.xml
4. config mapperScan in App.java
5. code UserMapperTest.java to test using junit how to test?
6. curl -X GET http://127.0.0.1:8080/mybatis/user

  {
      "id":11,
      "name":"tom",
      "password":"123456",
      "status":1
   }

*how to generate mapper automatically?*
 1. import plugin in pom,using mybatis-generator-maven-plugin:1.3.6:generate.
 2. config mybatis-generator.xml to define db connection,tables,packages.
 3. double click mybatis-generator plugin.
 4. check our floder.
 ![folder tree](https://github.com/grandhappy/springboot/tree/master/images/mybatis_1.png)

Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache and message broker. It supports data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs, geospatial indexes with radius queries and streams. Redis has built-in replication, Lua scripting, LRU eviction, transactions and different levels of on-disk persistence, and provides high availability via Redis Sentinel and automatic partitioning with Redis Cluster.

website:https://redis.io

how to import redis?

1. import spring-boot-starter-data-redis dependence in pom
2. config redis in application.properties
3. code RedisController.java to test how to test?
4. open redis-client,exec commond 'set news {code:200,message:"success"}'
5. curl -X GET http://127.0.0.1:8080/redis

{
 	code: 200,
 	message: "success"
}

MongoDB is a general purpose, document-based, distributed database built for modern application developers and for the cloud era. No database is more productive to use.
website:https://docs.mongodb.com/

how to import mongo?

1. import spring-boot-starter-data-mongodb dependence in pom
2. config mongo in application.properties
3. code MongoController.java to test how to test?
4. curl -X GET http://127.0.0.1:8080/mongo

{
    id: 111,
    name: "test",
    password: "123456",
    status: null,
    roles: null
}

  *Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex distributed systems where failure is inevitable.*  
  *website:https://github.com/Netflix/Hystrix* 
  ### part 1
  *how to import Hystrix?*
  1. import spring-cloud-starter-netflix-hystrix dependence in pom 
  2. add HystrixConfiguration 
  3. code HystrixController.java to test
  *how to test?*
  1. curl -X GET http://127.0.0.1:8080/hystrix/index
  ```
  hello new world
  ```
  1. curl -X GET http://127.0.0.1:8080/hystrix/index1
  ```
  hello new world1
  ```

  *Future is a interface that extra method to get a return value.*
  *Async is running methon asynchronous.*  
  *ThreadPoolTaskExecutor is a thread pool.*
  ### part 1
  *how to use muti-thread?*
  1. config thread pool 
  2. open enable async configureation 
  3. using @Async define a method and using AsyncResult define the method return value
  4. main thread call feature.get() getting the return value 
  *how to test?*
  1. curl -X GET http://127.0.0.1:8080/concurrent/index
  2. see log in console