如何开发一个前后端分离的在线旅游平台

package com.spring.controller;
import com.jntoo.db.*;
import com.jntoo.db.utils.*;
import com.spring.dao.*;
import com.spring.entity.*;
import com.spring.service.*;
import com.spring.util.*;
import com.spring.util.Info;
import java.util.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import tk.mybatis.mapper.entity.Example;
/**
 * 管理员 */
@Controller
public class AdminsController extends BaseController {
    @Autowired
    private AdminsMapper dao;
    @Autowired
    private AdminsService service;
    /**
     *  后台列表页
     *
     */
    @RequestMapping("/admins_list")
    public String list() {
        // 检测是否有登录，没登录则跳转到登录页面
        if (!checkLogin()) {
            return showError("尚未登录", "./login.do");
        }
        String order = Request.get("order", "id"); // 获取前台提交的URL参数 order  如果没有则设置为id
        String sort = Request.get("sort", "desc"); // 获取前台提交的URL参数 sort  如果没有则设置为desc
        int pagesize = Request.getInt("pagesize", 12); // 获取前台一页多少行数据
        Example example = new Example(Admins.class); //  创建一个扩展搜索类
        Example.Criteria criteria = example.createCriteria(); // 创建一个扩展搜索条件类
        String where = " 1=1 "; // 创建初始条件为：1=1
        where += getWhere(); // 从方法中获取url 上的参数，并写成 sql条件语句
        criteria.andCondition(where); // 将条件写进上面的扩展条件类中
        if (sort.equals("desc")) { // 判断前台提交的sort 参数是否等于  desc倒序  是则使用倒序，否则使用正序
            example.orderBy(order).desc(); // 把sql 语句设置成倒序
        } else {
            example.orderBy(order).asc(); // 把 sql 设置成正序
        }
        int page = request.getParameter("page") == null ? 1 : Integer.valueOf(request.getParameter("page")); // 获取前台提交的URL参数 page  如果没有则设置为1
        page = Math.max(1, page); // 取两个数的最大值，防止page 小于1
        List<Admins> list = service.selectPageExample(example, page, pagesize); // 获取当前页的行数
        // 将列表写给界面使用
        assign("totalCount", request.getAttribute("totalCount"));
        assign("list", list);
        assign("orderby", order); // 把当前排序结果写进前台
        assign("sort", sort); // 把当前排序结果写进前台
        return json(); // 将数据写给前端
    }
    public String getWhere() {
        _var = new LinkedHashMap(); // 重置数据
        String where = " ";
        // 以下也是一样的操作，判断是否符合条件，符合则写入sql 语句
        if (!Request.get("username").equals("")) {
            where += " AND username LIKE '%" + Request.get("username") + "%' ";
        }
        return where;
    }
    @RequestMapping("/admins_add")
    public String add() {
        _var = new LinkedHashMap(); // 重置数据
        return json(); // 将数据写给前端
    }
    @RequestMapping("/admins_updt")
    public String updt() {
        _var = new LinkedHashMap(); // 重置数据
        int id = Request.getInt("id");
        // 获取行数据，并赋值给前台jsp页面
        Admins mmm = service.find(id);
        assign("mmm", mmm);
        assign("updtself", 0);
        return json(); // 将数据写给前端
    }
    @RequestMapping("/admins_updtself")
    public String updtself() {
        _var = new LinkedHashMap(); // 重置数据
        // 更新个人资料
        int id = (int) request.getSession().getAttribute("id");
        Admins mmm = service.find(id);
        assign("mmm", mmm);
        assign("updtself", 1);
        return json(); // 将数据写给前端
    }
    /**
     * 添加内容
     * @return
     */
    @RequestMapping("/adminsinsert")
    public String insert() {
        _var = new LinkedHashMap(); // 重置数据
        String tmp = "";
        Admins post = new Admins(); // 创建实体类
        // 设置前台提交上来的数据到实体类中
        post.setUsername(Request.get("username"));
        post.setPwd(Request.get("pwd"));
        service.insert(post); // 插入数据
        int charuid = post.getId().intValue();
        if (isAjax()) {
            return jsonResult(post);
        }
        return showSuccess("保存成功", Request.get("referer").equals("") ? request.getHeader("referer") : Request.get("referer"));
    }
    /**
     * 更新内容
     * @return
     */
    @RequestMapping("/adminsupdate")
    public String update() {
        _var = new LinkedHashMap(); // 重置数据
        // 创建实体类
        Admins post = new Admins();
        // 将前台表单数据填充到实体类
        if (!Request.get("username").equals("")) post.setUsername(Request.get("username"));
        if (!Request.get("pwd").equals("")) post.setPwd(Request.get("pwd"));
        post.setId(Request.getInt("id"));
        service.update(post); // 更新数据
        int charuid = post.getId().intValue();
        if (isAjax()) {
            return jsonResult(post);
        }
        if (Request.getInt("updtself") == 1) {
            return showSuccess("保存成功", "admins_updtself.do");
        }
        return showSuccess("保存成功", Request.get("referer")); // 弹出保存成功，并跳转到前台提交的 referer 页面
    }
    /**
     *  删除
     */
    @RequestMapping("/admins_delete")
    public String delete() {
        _var = new LinkedHashMap(); // 重置数据
        if (!checkLogin()) {
            return showError("尚未登录");
        }
        int id = Request.getInt("id"); // 根据id 删除某行数据
        Map map = Query.make("admins").find(id);
        service.delete(id); // 根据id 删除某行数据
        return showSuccess("删除成功", request.getHeader("referer")); //弹出删除成功，并跳回上一页
    }
}

package com.spring.controller;
import com.alibaba.fastjson.JSON;
import com.spring.util.JsonResult;
import java.io.IOException;
import java.io.OutputStream;
import java.util.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.servlet.ModelAndView;
/**
 * 控制器基类
 */
public abstract class BaseController {
    @Autowired
    protected HttpServletRequest request; // 注入
    @Autowired
    protected HttpServletResponse response; // 注入
    @Autowired
    protected HttpSession session; // 注入
    protected ModelAndView mView;
    protected Map<Object, Object> _var;
    /**
     * 控制器
     */
    public BaseController() {
        //request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
        //response = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getResponse();
        mView = new ModelAndView();
        _var = new LinkedHashMap();
    }
    /**
     * 往模板中写入数据
     * @param name
     * @param value
     */
    protected void assign(String name, Object value) {
        request.setAttribute(name, value);
        _var.put(name, value);
    }
    /**
     * 弹出框
     * @param message
     * @param code
     * @param jumpUrl
     * @param jumpTime
     * @return
     */
    protected String showMessage(String message, int code, Object data, String jumpUrl, int jumpTime) {
        if (isAjax()) {
            JsonResult jsonResult = new JsonResult(code, message, data);
            return renderString(response, JSON.toJSONString(jsonResult));
        }
        assign("message", message == null ? data : message);
        assign("code", code);
        assign("jumpUrl", jumpUrl);
        assign("jumpTime", jumpTime);
        return "message";
    }
    /**
     * 将写入json写到前端
     * @return
     */
    public String json() {
        return jsonResult(_var);
    }
    public String jsonReturn(String message, int code, Object data) {
        JsonResult result = new JsonResult(code, message, data);
        return renderString(response, JSON.toJSONString(result));
    }
    public String jsonResult(Object data) {
        return jsonReturn(null, 0, data);
    }
    public String jsonError(String msg) {
        return jsonReturn(msg, 1, null);
    }
    public Object getRequestAttributeMap() {
        //Map<Object,Object> map = new LinkedHashMap();
        Enumeration<String> names = request.getAttributeNames();
        while (names.hasMoreElements()) {
            String key = names.nextElement();
            if (!_var.containsKey(key)) {
                // 没有，则写入
                _var.put(key, request.getAttribute(key));
            }
        }
        return _var;
    }
    public String getJson() {
        Map<Object, Object> map = new LinkedHashMap();
        Enumeration<String> names = request.getAttributeNames();
        while (names.hasMoreElements()) {
            String key = names.nextElement();
            Object value = request.getAttribute(key);
            map.put(key, value);
        }
        return renderString(response, JSON.toJSONString(map));
    }
    /**
     * 将字符串渲染到客户端
     *
     * @param response 渲染对象
     * @param string 待渲染的字符串
     * @return null
     */
    public String renderString(HttpServletResponse response, String string) {
        try {
            request.getSession();
            OutputStream stream = response.getOutputStream();
            response.setContentType("application/json");
            response.setCharacterEncoding("utf-8");
            stream.write(string.getBytes());
            stream.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "success";
    }
    protected boolean isAjax() {
        String accept = request.getHeader("accept");
        if (accept != null && accept.indexOf("application/json") != -1) {
            return true;
        }
        String xRequestedWith = request.getHeader("X-Requested-With");
        if (xRequestedWith != null && xRequestedWith.indexOf("XMLHttpRequest") != -1) {
            return true;
        }
        String ajax = request.getParameter("format");
        if ("json".equalsIgnoreCase(ajax)) {
            return true;
        }
        return false;
    }
    /**
     * 检测是否登录
     * @return
     */
    protected boolean checkLogin() {
        if (request.getSession().getAttribute("username") == null || "".equals(request.getSession().getAttribute("username"))) {
            return false;
        }
        return true;
    }
    /**
     * 弹出错误信息
     * @param message
     * @return
     */
    protected String showError(String message) {
        return showMessage(message, 1, null, "javascript:history(-1);", 2250);
    }
    /**
     *  弹出错误信息
     * @param message
     * @param code
     * @return
     */
    protected String showError(String message, int code) {
        return showMessage(message, code, null, "javascript:history(-1);", 2250);
    }
    /**
     * 弹出错误信息
     * @param message
     * @param url
     * @return
     */
    protected String showError(String message, String url) {
        return showMessage(message, 1, null, url, 2250);
    }
    /**
     * 弹出成功信息
     * @param data
     * @return
     */
    protected String showSuccess(Object data) {
        return showMessage(null, 0, data, request.getHeader("referer"), 2250);
    }
    /**
     * 弹出成功信息
     * @param data
     * @param url
     * @return
     */
    protected String showSuccess(String data, String url) {
        return showMessage(null, 0, data, url, 2250);
    }
}