上次已经为大家介绍过java spring boot中怎么加入依赖的主要内容了。今天再为大家介绍一些与之相关的内容，也就是java spring
boot中怎么 编写mapper以及怎么编写service和controller?一起来了解一下吧。
首先说一下，java spring boot中怎么编写mapper?
代码如下所示：
import java.util.List;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import cn.cnn.info.pojo.User;
//extends com.github.abel533.mapper.Mapper<User>:需要继承通用Mapper
@Mapper
public interface UserMapper extends com.github.abel533.mapper.Mapper < User >
{
@Select("select * from user where name like '%${value}%'")
public List < User > queryUserByName(String name);
// 使用UserMapper.xml配置文件
public List < User > queryAll();
}然后说一下怎么编写service和controller?
Service编写，代码如下所示：
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.github.pagehelper.PageHelper;
import cn.cnn.info.dao.UserDao;
import cn.cnn.info.dao.UserMapper;
import cn.cnn.info.pojo.User;
import cn.cnn.info.service.UserService;
@Service
public class UserServiceImpl implements UserService
{
@Autowired
private UserDao userDao;
@Autowired
private UserMapper userMapper;
@Override
public List < User > findAll()
{
List < User > list = this.userDao.findAll();
return list;
}
@Override
public List < User > queryUserByName(String name)
{
List < User > list = this.userMapper.queryUserByName(name);
return list;
}
// 调用使用UserMapper.xml的Mapper
@Override
public List < User > queryAll()
{
List < User > list = this.userMapper.queryAll();
return list;
}
// 使用通用Mapper和分页助手
@Override
public List < User > queryUserByPage(Integer page, Integer rows)
{
// 设置分页
PageHelper.startPage(page, rows);
// 使用通用Mapper的方法进行查询所有数据
List < User > list = this.userMapper.select(null);
return list;
}
}Controller编写，代码展示如下：
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import cn.cnn.info.pojo.User;
import cn.cnn.info.service.UserService;
@RestController
@RequestMapping("user")
public class UserControlelr
{
@Autowired
private UserService userService;
@RequestMapping("list")
public List < User > queryUserAll()
{
List < User > list = this.userService.findAll();
return list;
}
@RequestMapping("list/{name}")
public List < User > queryUserAll(@PathVariable String name)
{
List < User > list = this.userService.queryUserByName(name);
return list;
}
@RequestMapping("list/query")
public List < User > queryUserAll2()
{
List < User > list = this.userService.queryAll();
return list;
}
@RequestMapping("list/{page}/{rows}")
public List < User > queryUserAll(@PathVariable Integer page, @PathVariable Integer rows)
{
List < User > list = this.userService.queryUserByPage(page, rows);
return list;
}
}以上就是关于java spring boot中怎么 编写mapper以及怎么编写service和controller的主要内容了。具体的内容还是比较简单易懂的。如果你对java知识感兴趣，想要了解更多java实例和常见问题，敬请关注奇Q工具网。
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