• 分布式项目技术点目录(三)


    前言

    在学习完java的基础知识、常用框架之后,分布式的电商项目-ego是更贴近实际开发中的一个项目。涉及的技术点也比较多。当初培训完,找工作时,曾经整理过一次,但是只是纸上谈兵,对项目用到的技术比较熟,但是为什么要用它,整体上还是比较模糊。时间久了,都忘了,现在再重温下。以便自己更好的理解现在正热的微服务架构。

    一、项目结构

    在这里不再去从头搞一遍电商项目,关于项目搭建链接:https://www.cnblogs.com/szrs/p/12157083.html,里面包含了对SSM框架的搭建、配置说明;电商项目的大致搭建流程及用到的相关技术简述。

    本次梳理、本文只是针对其中用到的,现在可能还会用到的相关技术进行梳理;

    关于项目架构参看本次整理的dubbo博文,链接:https://www.cnblogs.com/szrs/p/14407198.html;

    本文主要详细梳理以下涉及的技术点:double、zookeeper、单点登录、redis、nginx、vsftp、easyUI。

    二、知识点

    2.0安装虚拟机

    参看链接:https://www.cnblogs.com/szrs/p/15145409.html

    2.1 double

    参看链接:https://www.cnblogs.com/szrs/p/14407198.html

    2.2 zookeeper

    参看链接:https://www.cnblogs.com/szrs/p/14409420.html

    2.3 单点登录

    参看链接:https://www.cnblogs.com/szrs/p/14406422.html

    2.4 Redis及虚拟机环境下安装Linux操作系统

    参看链接:https://www.cnblogs.com/szrs/p/13424772.html

    2.5 nginx

    参看链接:https://www.cnblogs.com/szrs/p/13439664.html

    2.6 Vsftp

    参看链接:https://www.cnblogs.com/szrs/p/13439664.html

    2.7 easyui

    前端框架,里面较多的用到了restful风格。

    (1)resfull风格:前台传递过来只有参数变化,来控制跳转的页面或所要访问的controller分发器的方法同时还能传递参数值
    (2)restful风格在{path},即声明变量的名称一致时,则@PathVariable(value属性可以省略)

    @RequestMapping("{path}")
    public String showPage(@PathVariable(value="path") String path){
      //System.out.println(path);
      return path;
    }
    @RequestMapping("item/param/query/itemcatid/{catid}")
    @ResponseBody
    public EgoResult selByCatId(@PathVariable(value="catid") long catid){
      TbItemParam param = tbItemParamService.selParamByCatId(catid);
      EgoResult er = new EgoResult();
      if(param==null){
        er.setStatus(400);
      }else{
        er.setStatus(200);
        er.setData(param);
      }
      return er;
    }

    @RequesMapping(value="item/desc/{id}.html",produces="text/html;charset=utf-8")
    @responseBody
    public String show(@PathVariable long id){
      TbItemDesc showItem=tbItemDescService.show(id);
      return show.getItemDesc();
    }

    (3)准备金应用实例

    前端

    <header class="main-header">
        <!-- Logo -->
        <a href="${pageContext.request.contextPath}/index.jsp" class="logo">
          <!-- mini logo for sidebar mini 50x50 pixels -->
          <span class="logo-mini"><b><i class="fa fa-rmb"></i></b></span>
          <!-- logo for regular state and mobile devices -->
          <span class="logo-lg"><b>人保再准备金系统</b></span>
        </a>
    
        <!-- Header Navbar: style can be found in header.less -->
        <nav class="navbar navbar-static-top">
          <!-- Sidebar toggle button-->
          <a href="#" class="sidebar-toggle" data-toggle="offcanvas" role="button">
            <span class="sr-only">Toggle navigation</span>
          </a>
          <!-- Navbar Right Menu -->
          <div class="navbar-custom-menu">
            <ul class="nav navbar-nav">
              <!-- Messages: style can be found in dropdown.less-->
              <li class="dropdown notifications-menu">
                <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                  <i class="fa fa-bell-o"></i>
                </a>
                <ul class="dropdown-menu">
                  <li class="header">文档下载</li>
                  <li>
                    <!-- inner menu: contains the actual data -->
                    <ul class="menu">
                      <li>
                        <a href="/syno/downloadMaterial/1">
                          <i class="fa fa-users text-aqua"></i> 操作手册下载
                        </a>
                      </li>
                      <li>
                        <a href="javascript:alert('目前没有数据')">
                          <i class="fa fa-warning text-yellow"></i> 版本变更下载
                        </a>
                      </li>
                      <li>
                        <a href="/syno/downloadMaterial/3">
                          <i class="fa fa-users text-red"></i> 四级险类及税率对照表下载
                        </a>
                      </li>
    
                      <li>
                        <a href="/syno/downloadMaterial/4">
                          <i class="fa fa-shopping-cart text-green"></i> 四级分保类型对照表下载
                        </a>
                      </li>
                      <li>
                        <a href="/syno/downloadMaterial/5">
                          <i class="fa fa-user text-red"></i> 再保账单科目对照表下载
                        </a>
                      </li>
                    </ul>
                  </li>
                  <li class="footer"><!--<a href="#">View all</a>--></li>
                </ul>
              </li>
    
              <!-- User Account: style can be found in dropdown.less -->
              <li class="dropdown user user-menu">
                <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                  <img src="${pageContext.request.contextPath}/bs/dist/img/picc-160x160.jpg"
                       class="user-image" alt="User Image">
                  <span class="hidden-xs" id="showname" ></span>
                </a>
                <ul class="dropdown-menu">
                  <!-- User image -->
                  <li class="user-header">
                    <img src="${pageContext.request.contextPath}/bs/dist/img/picc-160x160.jpg"
                         class="img-circle" alt="User Image">
                    <p id="shownameandcode">
                    </p>
                    <p id="showgrade">
                    </p>
                  </li>
                  <!-- Menu Body -->
    
                  <!-- Menu Footer-->
                  <li class="user-footer">
    
                    <div class="pull-right">
                      <div style="display: none">
                        <form class="form-horizontal" role="form" method="post" id="logoutform"
                              action="/login/logout.do">
                        </form>
                      </div>
                      <a href="#" class="btn btn-default btn-flat" id="signOut">退出</a>
                    </div>
                  </li>
                </ul>
              </li>
              <!-- Control Sidebar Toggle Button -->
              <li>
                <a href="#" data-toggle="control-sidebar"><i class="fa fa-gears"></i></a>
              </li>
            </ul>
          </div>
    
        </nav>
      </header>

    后端

    @Controller
    @RequestMapping("/syno")
    public class ZrjSynoController {
    /**
         * 下载固定资料
         * @param typo 类型 1:操作手册 word 2:变更 excel 3:险类对照 excel 4:分保类型对照 excel 5:账单科目对照 excel
         * @param response 流
         * @throws IOException IO异常
         */
        @RequestMapping(value="downloadMaterial/{typo}")
        public void downloadMaterial(
                @PathVariable String typo,
                HttpServletResponse response,
                HttpServletRequest request
                ) throws IOException {
    
    
            String path = request.getSession().getServletContext().getRealPath("/");
    
            String filename = "";
            String fullName = "";
            String contentType = "";
    
    
            switch (typo){
                case "1":
                    contentType = "application/vnd.ms-word;charset=gb2312";
                    filename = "操作手册.docx";
                    break;
                case "2":
                    contentType = "application/vnd.ms-excel;charset=gb2312";
                    filename = "NONE";
                    break;
                case "3":
                    contentType = "application/vnd.ms-excel;charset=gb2312";
                    filename = "四级险类及税率对照表.xlsx";
                    break;
                case "4":
                    contentType = "application/vnd.ms-excel;charset=gb2312";
                    filename = "四级分保类型对照表.xlsx";
                    break;
                case "5":
                    contentType = "application/vnd.ms-excel;charset=gb2312";
                    filename = "再保账单科目对照表.xlsx";
                    break;
            }
    
            fullName = path+File.separator+ "download" +File.separator+filename;
    
            File file = new File(fullName);
            // 以流的形式下载文件。
            InputStream fis = new BufferedInputStream(new FileInputStream(fullName));
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);
            fis.close();
            // 清空response
            response.reset();
            // 设置response的Header
            response.addHeader("Content-Disposition", "attachment;filename="
                    + new String(filename.getBytes("UTF-8"), "ISO-8859-1"));
            response.addHeader("Content-Length", "" + file.length());
            OutputStream toClient = new BufferedOutputStream(
                    response.getOutputStream());
            response.setContentType(contentType);
            toClient.write(buffer);
            toClient.flush();
            toClient.close();
            //file.delete();
        }
    }

    ···

    如果错过太阳时你流了泪,那你也要错过群星了。
    在所有的矛盾中,要优先解决主要矛盾,其他矛盾也就迎刃而解。
    不要做个笨蛋,为失去的郁郁寡欢,聪明的人,已经找到了解决问题的办法,或正在寻找。
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  • 原文地址:https://www.cnblogs.com/szrs/p/12803711.html
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