[Shiro] - shiro之SSM中的使用

在学习shiro的途中,在github发现了一个开源项目,所需的控件刚好是自己要学习的方向.

虽然还要学习完ssm的shiro与springboot的shiro,以及接下来的种种控件和类库,但学习这个开源项目刻不容缓

[SSM的shiro使用]

SSM简单的说,就是SpringMVC负责web部分,mybatis负责数据库部分,否则没有mybatis要写的jdbc是很费时间的.

所以基于ssm的shiro项目,就是Servlet部分修改为SpringMVC,数据库部分,修改为Mybatis,然后把shiro集成进去,用这样一个思路来把项目实现.

老式Servlet:

package com.ykmimi.gobang.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class LognServlet
 */
@WebServlet(description = "五子棋登陆", urlPatterns = { "/login" })
public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        request.setCharacterEncoding("utf-8");
        /////* 获取用户名和密码
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        PrintWriter pw = response.getWriter();
        if(username.equals("admin") && password.equals("admin")) {
            pw.print("登陆成功!??");
            request.getRequestDispatcher("gobang.jsp");
        }else {
            pw.print("登陆失败,请核对账户及密码.??");
//            request.getRequestDispatcher("");
        }

    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

而SpringMVC:

package com.ykmimi.controller;

import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;

import com.ykmimi.bean.User;

@Controller
public class UserController {

    @RequestMapping("login")
    public String login(User u,ModelMap map,HttpSession session) {
        System.out.println(u.getName()+":"+u.getPassword());
        /*map.put("uname", u.getName());
        map.put("upassword", u.getPassword());*/
        session.setAttribute("User", u);
        return "show";
    }
}

可以看出Servlet的方式是通过request,response配合doGet,doPost请求进行数据的传递,而

SpringMVC是通过将一整个数据封装为bean对象,继而返回页面或者返回@ResponseBody形式(JSON).

上面将整个User用户放入了session中,这个好像不是很提倡的做法,不过这里是做个测试.

再看一眼老式的JDBC:

package com.ykmimi.ipchecker.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import com.ykmimi.ipchecker.entity.SearchingData;
import com.ykmimi.ipchecker.util.JDBCUtil;

public class IPAddressDao {

    /////* 插入新数据到表addressIp
    public void insertSomeData(SearchingData sdata) throws SQLException, ClassNotFoundException {
        Connection conn = null;
        PreparedStatement ps = null;
        String sql = "insert into addressIp values(nextval(‘seq_addressIp‘),?,?,current_date)";
        try {
        conn= JDBCUtil.getConnection();
        ps = conn.prepareStatement(sql);
        ps.setString(1, sdata.getIpDomain());
        ps.setString(2, sdata.getIp());
        ps.executeUpdate();
        }finally {
            JDBCUtil.close(null, ps, null);
        }

    }
}

当使用之前老式的JDBC时,要分别对insert,select,update,delete等操作进行区分,牵扯到的有将不同的语句执行不同的方法.

比如select查询要执行executeQuery(),而其它的执行上面代码中的executeUpdate(),以及每个SQL语句都将写在java类中,

这与"高内聚,低耦合"的Java信条不符合,(比如SQL要进行更改时),那么就是要将SQL语句进行在解耦,Mybatis框架实现了这一操作.

Mybatis可以参考之前ukzq自己写的两篇博客 Mybatis体系结构 Mybatis基本工作原理

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原文地址：https://www.cnblogs.com/ukzq/p/10227726.html