SpringCloud之构建第一个微服务项目

构建第一个微服务项目

1.实体类服务（只提供实体类）

package com.saxon.springcloud.pojo;

import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;

import java.io.Serializable;
@Data
@NoArgsConstructor
@Accessors(chain = true)
public class Dept implements Serializable {
    private long deptno;
    private String deptname;
    private String db_source;

    public void setDeptname (String deptname) {
        this.deptname = deptname;
    }
}

2.数据库处理阶段（dao+service）

1.Dao

package com.saxon.springcloud.dao;

import com.saxon.springcloud.pojo.Dept;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper
@Repository
public interface DeptDao {
    int insertDept (Dept dept);

    Dept queryDeptById (long id);

    List<Dept> queryAllDept ();
}

2.service

package com.saxon.springcloud.service;

import com.saxon.springcloud.pojo.Dept;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Service;

import java.util.List;
@Service
public interface DeptService {
    int insertDept(Dept dept);
@Bean
    Dept queryDeptById(long id);

    List<Dept> queryAllDept();
}

package com.saxon.springcloud.service;

import com.saxon.springcloud.dao.DeptDao;
import com.saxon.springcloud.pojo.Dept;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class DeptServiceimpl implements DeptService {

    DeptDao deptDao;

    @Autowired
    public void setDeptDao (DeptDao deptDao) {
        this.deptDao = deptDao;
    }

    @Override
    public int insertDept (Dept dept) {
        return deptDao.insertDept (dept);
    }

    @Override
    public Dept queryDeptById (long id) {
        return deptDao.queryDeptById (id);
    }

    @Override
    public List<Dept> queryAllDept () {
        return deptDao.queryAllDept ();
    }
}

package com.saxon.springcloud.controller;

import com.saxon.springcloud.pojo.Dept;
import com.saxon.springcloud.service.DeptService;
import com.saxon.springcloud.service.DeptServiceimpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
public class DeptCotroller {
    @Autowired
    DeptService deptService;



    @PostMapping ("/insert")
    @ResponseBody
    public int insertDept (Dept dept) {
        return deptService.insertDept (dept);
    }

    @GetMapping ("/get/{id}")
    @ResponseBody
    public Dept queryDeptById (@PathVariable ("id") long id) {
        return deptService.queryDeptById (id);
    }

    @GetMapping ("/getAll")
    @ResponseBody
    public List<Dept> queryAllDept () {
        return deptService.queryAllDept ();
    }
}

3.controller

接收指定端口传过来的数据

package com.saxon.springcloud.controller;

import com.saxon.springcloud.pojo.Dept;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class ConsumerDept {
    @Autowired
    RestTemplate restTemplate;

    public static final String REQUEST_URL="http://localhost:8001/";

    @GetMapping("/consumer/dept/get/{id}")
    public Dept queryDeptById(@PathVariable("id") long id){
        return restTemplate.getForObject (REQUEST_URL+"get/ "+id,Dept.class);
    }

}

使用的核心对象就是RestTemplate

package com.saxon.springcloud.configuration;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class config {
    @Bean
    public RestTemplate getRestTemplate () {
        return new RestTemplate ();
    }
}

使用的就是前面提到的@Bean注解；

RestTemplate的结构

对应的就是一些请求方式：分别是 get,post ,delete ,put,head,option。。。对应的方法就是 xxxForObject获得xxxForEntity,获得对象和获得实体的区别

关于方法里面的3个参数，有的是两个

URL：地址
object：返回值类型
最后一个属性，参数类型