springboot A项目jar包调用B项目，项目C接口调用A 事务添加

1.项目b打包依赖修改，把上面的springboot默认打包依赖注释，改为下面的，因为默认打包出来是可执行jar，导入项目a后无法扫描

    
        
            
                
                
            
        
    
 
    
    
        
            
                org.apache.maven.plugins
                maven-compiler-plugin
                
                    1.8
                    1.8
                
            
        
    

将项目b打包安装到本地maven仓库，可以用idea界面操作或者命令行，然后把依赖写入项目a的pom中

      
            com.example
            newauto1
            jar
            0.0.1-SNAPSHOT
        

在项目a中的启动入口处添加需要启动扫描的包，包括项目a和项目b的

注意：项目a和项目b中不能有同名的类名，否则会报错启动不了

@SpringBootApplication(scanbasePackages = {"com.demo4.demo", "com.example.newauto1"})
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}

B有一方法

@Service
public class StuServiceImpl implements  StuService{
    @Autowired
    StuMapper stuMapper;
    @Autowired
    UsersMapper usersMapper;

    @Override
    public String findStu(String name) {
        Stu stu = new Stu();
        stu.setStuname(name);
        Stu stu1 = stuMapper.selectOne(stu);
        return stu1.toString();
    }
}

A调用

@RestController
@RequestMapping("/stu2")
public class Stu2Controller {
    @Autowired
    private StuService stuService;

    @GetMapping("/select")
    public String getStu(@Param("userName") String userName ) {
        return stuService.findStu(userName);
    }
}

C项目

package com.demo3.demo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.client.RestTemplate;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
@Controller
public class A {
    @Autowired
    RestTemplate restTemplate;
    
    @GetMapping("/getMethodHasParamReturnList")
    public ResponseEntity getMethodHasParamReturnList(){
        Map param=new HashMap<>();
        param.put("pageNum",1);
        param.put("pageSize",2);
        HttpHeaders headers=new HttpHeaders();
        ResponseEntity response = restTemplate.exchange(
                "http://127.0.0.1:8082/stu2/select?userName=sss2",
                HttpMethod.GET,
                new HttpEntity(headers),
                String.class,
                param);
        System.out.println(response.getBody());
        return response;
    }
}

postman调用即可
http://127.0.0.1:8080/getMethodHasParamReturnList

sevice实现类 @Transactional

    @Override
    @Transactional
    public String insertStu(Stu stu) {
        stuMapper.insert(stu);
        Users users = new Users();
        users.setId(stu.getUserid());
        users.setUsername(stu.getStuname());
        int i = Integer.parseInt(stu.getStuname());
        users.setPwd(String.valueOf(i));
        usersMapper.insert(users);
        return "添加成功了"+stu.getStuname();
    }

启动类添加@EnableTransactionManagement

package com.example.newauto1;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import tk.mybatis.spring.annotation.MapperScan;

@SpringBootApplication
@MapperScan({"com.example.newauto1.mapper"})
@EnableTransactionManagement
public class Newauto1Application {

    public static void main(String[] args) {
        SpringApplication.run(Newauto1Application.class, args);
    }

}