上两节讲了基本的配置和数据库连接。
这一节讲service层和controller层
其实具体的逻辑操作可以放到controller里面,就省了service
但为了分层更明确和代码复用的原因才有了service层
service 层通常指业务层,具体的业务逻辑写到里面 举例如下
service层
package com.xxxx.test.service; import com.xxxx.test.dao.UserEntityDAO; import com.xxxx.test.model.UserEntity; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.HashMap; import java.util.Map; /** * Created by yab on 2017/7/24. */ @Service public class UserServices { @Autowired UserEntityDAO userEntityDAO; /** * * @param username 用户名 * @param password 密码 * @return * @throws Exception */ public Map<String, Object> login(String username , String password) throws Exception { Map<String,Object> returnMap = new HashMap<String,Object>(); String hql = "from UserEntity u where u.username='"+username+"'"; UserEntity userInf = new UserEntity(); try { userInf = userEntityDAO.findOne(hql); } catch (Exception e) { e.printStackTrace(); } if(userInf!=null) { if (password.equals(userInf.getPassword())) { returnMap.put("value", userInf); returnMap.put("message", "登录成功"); returnMap.put("success", true); }else{ returnMap.put("value", userInf); returnMap.put("message", "密码错误"); returnMap.put("success", false); } }else{ returnMap.put("message", "用户不存在"); returnMap.put("success", false); } return returnMap; } }
controller层调用
package com.xxxx.test.controller; import com.xxxx.test.model.UserEntity; import com.xxxx.test.service.UserServices; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import java.util.HashMap; import java.util.Map; /** * Created by yab on 2017/7/24. */ @Controller public class UserController { @Autowired private UserServices userService; @RequestMapping(value="/login",method= RequestMethod.GET) @ResponseBody public Map<String,Object> login(HttpServletRequest request){ String username = request.getParameter("username"); String password = request.getParameter("password"); Map<String,Object> returnMap = new HashMap<String,Object>(); try { Map<String,Object> map = userService.login(username, password); //获取user实体 Object object = map.get("value"); if(object != null){ UserEntity user = (UserEntity) object; HttpSession session = request.getSession(); session.setAttribute("userId", user.getId()); } returnMap.put("value", object); returnMap.put("message", map.get("message")); returnMap.put("success", map.get("success")); } catch (Exception e) { returnMap.put("message", "异常:登录失败!"); returnMap.put("success", false); e.printStackTrace(); } return returnMap; } }
页面访问
由于controller层方法配置的为get请求,所以可以使用浏览器直接访问接口。