SpringMVC+ibatis+MySQL+MongoDB构建博客系统（二）

三、dao层的实现

构建UserDao接口，并使用@Respository将其注射到spring容器中。

package com.jcx.blog.dao;

import com.jcx.blog.domain.po.User;
import org.springframework.stereotype.Repository;

import java.util.List;
/**
 * Created by jichenxiao on 2016/4/6.
 */
@Repository
public interface UserDao {
    List<User> selectAllUser();
    public void addUser(User user);
    public User selectUserByNickname(String nickname);
}

在编写UserDao的实现类之前，需要编写BaseDao类，因为所有的实现类都要集成

package com.jcx.blog.dao;

/**
 * Created by jichenxiao on 2016/4/6.
 */
public class BaseDao extends org.springframework.orm.ibatis.support.SqlMapClientDaoSupport{
    @javax.annotation.Resource(name = "sqlMapClient")
    private com.ibatis.sqlmap.client.SqlMapClient sqlMapClient;

    @javax.annotation.PostConstruct
    public void initSqlMapClient(){
        super.setSqlMapClient(sqlMapClient);
    }
}

接下来开始编写实现类。

package com.jcx.blog.dao.impl;

import com.jcx.blog.dao.BaseDao;
import com.jcx.blog.dao.UserDao;
import com.jcx.blog.domain.po.User;
import org.springframework.stereotype.Component;

import java.util.List;
/**
 * Created by jichenxiao on 2016/4/6.
 */
@Component("userDao")
public class UserDaoImpl extends BaseDao implements UserDao {

    @Override
    public List<User> selectAllUser() {
           return (List<User>) getSqlMapClientTemplate().queryForList("User.selectAllUser");
    }

    @Override
    public void addUser(User user) {
        getSqlMapClientTemplate().insert("User.addUser", user);
    }

    @Override
    public User selectUserByNickname(String nickname) {
        return (User)getSqlMapClientTemplate().queryForObject("User.selectUserByNickname",nickname);
    }
}

四、service层

服务层主要完成了对dao层的调用以及一些其他的逻辑操作。用户管理服务通过UserSercvice实现，UserService.java如下。

package com.jcx.blog.service;

import com.jcx.blog.domain.po.User;

import javax.servlet.http.HttpServletRequest;
import java.util.List;
/**
 * Created by jichenxiao on 2016/4/7.
 */
public interface UserService {
    List<User> selectAllUser();
    public void addUser(HttpServletRequest request);
    public String selectUserByNickname(HttpServletRequest request);
}

UserServiceImpl.java实现类如下所示，主要完成了对dao层的调用。

<span style="font-size:14px;">package com.jcx.blog.service.impl;

import com.jcx.blog.dao.UserDao;
import com.jcx.blog.domain.po.User;
import com.jcx.blog.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.servlet.http.HttpServletRequest;
import java.util.List;
/**
 * Created by jichenxiao on 2016/4/7.
 */
@Service(value = "UserService")
public class UserServiceImpl implements UserService{
    @Autowired
    private UserDao userDao;

    @Override
    public List<User> selectAllUser() {
        return userDao.selectAllUser();
    }

    @Transactional
    @Override
    public void addUser(HttpServletRequest request) {
        String nickname = request.getParameter("nickname");
        String password = request.getParameter("password");
        String first_name = request.getParameter("first_name");
        String last_name = request.getParameter("last_name");
        User user = new User();
        user.setNickname(nickname);
        user.setPassword(password);
        user.setFirst_name(first_name);
        user.setLast_name(last_name);
        userDao.addUser(user);
    }

    @Override
    public String selectUserByNickname(javax.servlet.http.HttpServletRequest request) {
        String nickname = request.getParameter("nickname");
        String password = request.getParameter("password");
        User user = userDao.selectUserByNickname(nickname);
        if(user != null && user.getPassword().equals(password))
            return "success";
        else
            return "fail";
    }
}</span><span style="font-family:Microsoft YaHei;font-size:18px;">
</span>

五、控制层

控制层即controller在web模块中，作用是接收前端的请求，并调用服务层进行相应的处理。UserController如下所示。

package com.jcx.blog.controller;
import com.jcx.blog.domain.po.User;
import com.jcx.blog.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.http.HttpServletRequest;
import java.util.List;
/**
 * Created by jichenxiao on 2016/4/7.
 */
@Controller
public class UserController {
    @Autowired
    private UserService userService;

    @RequestMapping(value = "/", method = RequestMethod.GET)
    public String index(){
        return "index";
    }
    @RequestMapping(value = "/error", method = RequestMethod.GET)
    public String error(){
        return "error";
    }
    @RequestMapping(value = "/userlist", method = RequestMethod.GET)
    public String getUserList(ModelMap modelMap){
        List<User> userList = userService.selectAllUser();
        modelMap.addAttribute("userList",userList);
        return "userList";
    }
    @RequestMapping(value = "/addUserP", method = RequestMethod.POST)
    public String addUser(HttpServletRequest request){
        userService.addUser(request);
        return "redirect:/userlist";
    }
    @RequestMapping(value = "/login", method = RequestMethod.GET)
    public String login(){
        return "login";
    }
    @RequestMapping(value = "/logincheck", method = RequestMethod.POST)
    public String loginCheck(HttpServletRequest request){
        String result = userService.selectUserByNickname(request);
        if(result.equals("success"))
            return "redirect:/userlist";
        else
            return "redirect:/error";
    }

}

至此，所有后台开发的流程已经完成，视图层将在后续继续开发，目前使用JSP进行调试。

未完待续。