spring boot 1

 

1、创建项目。

meven可以配置阿里云meven镜像

<mirror>
        <id>nexus-aliyun</id>
        <mirrorOf>central</mirrorOf>
        <name>Nexus aliyun</name>
        <url>http://maven.aliyun.com/nexus/content/groups/public</url>
</mirror>

删除不需要的文件

pom文件

<dependencies>
        <dependency>
            <!-- springboot启动web项目依赖-->
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <!-- springboot单元测试用-->
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <!-- 使用meven构建项目插件-->
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

 

meven库地址：http://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core/2.10.0

报错：SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder”

解决：在pom文件添加依赖包：http://blog.csdn.net/liuxiangke0210/article/details/77892564

<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-simple -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.7.25</version>
        </dependency>

写一个类：

package com.milan.quick;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {
    @RequestMapping(value = "/hello",method = RequestMethod.GET)
    public String say(){
        return "Hello Milan";
    }
}

启动：

1、右键，run ，访问http://127.0.0.1:8080/hello  OK

2、进入pom所在目录，运行 mvn srping-boot:run

3、mvn install 编译程序 进入taget目录 java -jar xxx.jar启动

　　自定义配置文件  java -jar xxx.jar --spring.profiles.active=

设置编码格式：http://blog.csdn.net/frankcheng5143/article/details/50779149

配置文件支持 properties yml 2种格式：

application.properties
-------------------------------
server.port=8081
# url前缀 这样访问需要127.0.0.1:8081/quick/hello 访问
server.context-path=/quick

--------------------------------
application.yml

server:
  port: 8081
  context-path: /quick

自定义配置 三个配置文件  application.yml,application-dev.yml,application-test.yml 可以用做环境切换

#application.yml
spring:
  profiles:
    active: dev

#application-test.yml
server:
  port: 8082
  context-path: /quick
myname: milan
age: 24
content: "${myname},age:${age}"
girl:
  name: ceshi_test
  age:  19


#application-dev.yml
server:
  port: 8080
  context-path: /quick
myname: milan
age: 24
content: "${myname},age:${age}"
girl:
  name: kaifa_name
  age:  25

对应代码

// GirProperties.java
package com.milan.quick;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
@Component
@ConfigurationProperties(prefix = "girl")
public class GirProperties {
    public void setName(String name) {
        this.name = name;
    }
    public String getName() {
        return name;
    }
    private String name;
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    private int age;
}

#HelloController .java

package com.milan.quick;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {
    @RequestMapping(value = "/hello",method = RequestMethod.GET)
    public String say(){
        return myname+age+"content:"+content;
    }
    @RequestMapping(value = "/girl",method = RequestMethod.GET)
    public String mygril(){
        return mygirl.getName()+","+mygirl.getAge();
    }
    @Value("${myname}")
    private String myname;
    @Value("${age}")
    private int age;
    @Value("${content}")
    private String content;
    @Autowired
    private GirProperties mygirl;

}

注解汇总：

@Value("${myname}")

@Autowired 使用注解类

@Component
@ConfigurationProperties(prefix = "girl") //将注解注入到类中

自定义配置文件启动： java -jar xxx.jar --spring.profiles.active=test

Controller的使用

@Controller 处理http请求
@RestController 返回json。以前返回json需要@ResonseBosy+@Controller组合
@RequestMapping 配置url映射

@RequestMapping(value = {"/str","/getstr"}) //2个路径都会被映射。且不限制请求方法

获取参数中的值

@PathVariable //获取url中的数据
@RequestParam //获取请求参数的值
@GetMapping //组合注解

@RestController
@RequestMapping("/test")
public class Test1Controller {
    //http://127.0.0.1:8080/test/s1/11
    @RequestMapping(value = "/s1/{id}",method = RequestMethod.GET)
    public String s1(@PathVariable("id") int id){
        return  "s1 id is "+id;
    }
    //http://127.0.0.1:8080/test/s2?id=12 获取 id
    @RequestMapping(value = "/s2",method = RequestMethod.GET)
    public String s2(@RequestParam("id") int id){
        return  "s2 id is "+id;
    }
    //http://127.0.0.1:8080/test/s3?id= 设置默认值
    @GetMapping(value = "/s3")
    public String s3(@RequestParam(value = "id",required = true,defaultValue="1") int id){
        return  "s3 id is "+id;
    }
}

Spring-Data-Jpa

JPA:定义了一系列对象持久化的标准。是spring对hibernate的整合。

依赖增加：

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <version>RELEASE</version>
        </dependency>

配置文件增加

spring:
  profiles:
    active: dev
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://xxx:336/test
    username: --
    password: --
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true

package com.milan.quick;
import org.springframework.data.jpa.repository.JpaRepository;
import java.util.List;
public interface  GirlRepository extends JpaRepository<Girl2,Integer>{
    public List<Girl2> findByAge(Integer age);
}
// 对单表的增删改查
package com.milan.quick;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.transaction.Transactional;
import java.util.List;

@RestController
public class GirlController {
    @Autowired
    private GirlRepository girlRepository;
    @GetMapping(value = "/girls")
    public List<Girl2> getList(){
        return girlRepository.findAll();
    }
    @PostMapping(value = "/girls")
    public Girl2 Add(@RequestParam(value = "name") String name,@RequestParam(value = "age") Integer age){
        Girl2 g = new Girl2();
        g.setName(name);
        g.setAge(age);
        return girlRepository.save(g);
    }

    @PostMapping(value = "/updategirl")
    public Girl2 Update(@RequestParam(value = "name") String name,@RequestParam(value = "age") Integer age,@RequestParam(value = "id") Integer id){
        Girl2 g = new Girl2();
        g.setId(id);
        g.setName(name);
        g.setAge(age);
        return girlRepository.save(g);
    }
    @DeleteMapping(value = "/girls")
    public String Delete(@RequestParam(value = "id") Integer id){
         girlRepository.delete(id);
         return  "true";
    }
    @GetMapping(value = "/girls/{id}")
    public Girl2 Search(@PathVariable("id") Integer id){
        return girlRepository.findOne(id);
    }
    @GetMapping(value = "/searchbyage/{age}")
    public List<Girl2> SearchByAge(@PathVariable("age") Integer age){
        return girlRepository.findByAge(age);
    }
    @Autowired
    private GirlService girlService;
    @GetMapping(value = "/tran")
    public  void service(){
        girlService.insertTwo();
    }
}
//事务
package com.milan.quick;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.GetMapping;

import javax.transaction.Transactional;

@Service
public class GirlService {
    @Autowired
    private GirlRepository girlRepository;
    @Transactional
    public void insertTwo(){
        Girl2 g = new Girl2();
        g.setName("a");
        g.setAge(1);
        girlRepository.save(g);
        Girl2 a = new Girl2();
        a.setName("ba");
        a.setAge(2);
        girlRepository.save(a);
    }
}

package com.milan.quick;

import javax.persistence.*;

@Entity
public class Girl2 {
    @Id
    @GeneratedValue(strategy= GenerationType.AUTO)
    private Integer id;
    private String name;
    private int age;

    public Girl2() {
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}