一、Mybatis-generator-gui
下载地址：https://github.com/LittlePageProgram/mybatis-generator-gui.git
使用方法：填写相关项，点击生成
注意项：
1.有关EntityExample，需要拖进mapper层
2.有关修改XML配置信息，相应的example也需要进行调整到mapper层
案例：
service层
package com.littlepage.service; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.littlepage.entity.User; import com.littlepage.mapper.UserExample; import com.littlepage.mapper.UserMapper; @Service public class UserService { @Autowired UserMapper userMapper; public List<User> selectAll() { UserExample example=new UserExample(); example.createCriteria(); return userMapper.selectByExample(example); } public void add() { UserExample example=new UserExample(); userMapper.deleteByExample(example); } public boolean selectByLoginNameAndPassword(String name,String password) { UserExample example=new UserExample(); System.out.println(name); System.out.println(password); example.createCriteria().andNameEqualTo(name).andPasswordEqualTo(password); List<User> li=userMapper.selectByExample(example); System.out.println(li); return li.size()!=0 ; } }
二、PageHelper 一个好用的分页插件
public List<User> selectAll(int pageNum,int pageSize) { PageHelper.startPage(pageNum, pageSize); UserExample example=new UserExample(); example.createCriteria(); return userMapper.selectByExample(example); }
快速传值分页，这个原理运用了AOP编程
三、前后端分离
理论：
后端仅仅提供接口，前端进行获取数据和进行跳转。
优点：
1、对服务器的压力减小到最小
2、后台错误不会直接反映到前台，错误接秒较为友好
3、前后台各尽其职可以最大程度的减少开发难度。
实现：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> </head> <link rel="stylesheet" href="/css/bootstrap.min.css" /> <script src="/js/jquery.min.js"></script> <script src="/js/bootstrap.min.js"></script> <script> $(function (){ $("#login_btn").click(function (){ var loginName=$('#loginName').val(); var password=$('#password').val(); if(loginName==''||password==''){ $('#tip').html('用户名密码不能为空'); $('#tip').css('color','red'); return false; }else{ var url='/account/validateAccount'; var args={loginName:loginName,password:password}; $.post(url,args,function(data){ if(data=='success'){ window.location.href='/account/success'; }else{ $('#tip').html('密码错误'); $('#tip').css('color','red'); } console.log(data); }) return false; } }) }) </script> <body> <div align="middle"> <br /> <br /> <hr/> <br /> <div align="middle"> <h3>登录界面</h3> </div> <br /> <br /> <form action="/account/validateAccount" method="post"> <input type="text" placeholder="用户名" id="loginName" /><br /><br /> <input type="password" placeholder="密码" id="password" /><br /><br /> <div><span id="tip"></span></div><br /> <button id="login_btn" type="submit" >登录</button> </form> </div> </body> </html>
HTML页面
package com.littlepage.controller; import java.util.List; 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.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import com.littlepage.entity.User; import com.littlepage.service.UserService; @Controller @RequestMapping("/account") public class AccountController { @Autowired UserService userService; @RequestMapping("/login") public String loginPage() { return "login"; } @RequestMapping("/validateAccount") @ResponseBody public String list(@RequestParam("loginName")String loginName,@RequestParam("password")String password) { if(userService.selectByLoginNameAndPassword(loginName, password)) { return "success"; }else { return "false"; } } @RequestMapping("/success") public String successPage() { return "account/success"; } @RequestMapping("/list") @ResponseBody public List<User> list() { return userService.selectAll(2, 2); } }
控制器
四、权限实现
package com.littlepage.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Component;
@WebFilter(urlPatterns = "/*")
@Component
public class AccountFilter implements Filter {
private final String[] IGNORE_URI= {"index","css","js"};
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest httpReq=(HttpServletRequest)request;
HttpServletResponse httpRes=(HttpServletResponse)response;
//1.从session找Account对象
//找到就全部放行
//找不到就执行2
//1.判断URI是不是在Ignore列表里,在就放行
String uri=httpReq.getRequestURI();
for (String string : IGNORE_URI) {
if(uri.contains(string)) {
System.out.println("contains");
chain.doFilter(request, response);
}
}
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("启动权限filter");
}
}