登录与注册

随后我们开始设置登录与注册页面，我们需要设定一些制度，比如没有注册的用户不可以登陆，不登陆不可以查看数据。
在登陆和注册时也需要添加提示功能，类似于登录时的密码错误时提示，注册时两次密码不相同时提示等日常登录注册页面所需要的提示功能必须都具备。

登陆页面部分
还有登录页路由

通过angular.js，可以实现登陆成功后进入news.html。登录成功后就进入主页面。

注册页面部分
注册页路由

非注册用户和注册用户试图访问时也需要被区别，在登录页路由中，首先调用userDAO来保存session信息。

最后还有退出登录的操作，按照所查的资料说明退出时需要删除session.

#####查询

首先准备好如下的search.html。

<form class="form-horizontal" role="form"><div class="row" style="margin-bottom: 10px;"><label class="col-lg-2 control-label">标题关键字</label><div class="col-lg-3"><input type="text" class="form-control" placeholder="标题关键字" ng-model="$parent.title1"></div><div class="col-lg-1"><select class="form-control" autocomplete="off" ng-model="$parent.selectTitle"><option selected="selected">AND</option><option>OR</option></select></div><div class="col-lg-3"><input type="text" class="form-control" placeholder="标题关键字" ng-model="$parent.title2"></div></div><div class="row" style="margin-bottom: 10px;"><label class="col-lg-2 control-label">内容关键字</label><div class="col-lg-3"><input type="text" class="form-control" placeholder="内容关键字" ng-model="$parent.content1"></div><div class="col-lg-1"><select class="form-control" autocomplete="off" ng-model="$parent.selectContent"><option selected="selected">AND</option><option>OR</option></select></div><div class="col-lg-3"><input type="text" class="form-control" placeholder="内容关键字" ng-model="$parent.content2"></div></div><div class="form-group"><div class="col-md-offset-9"><button type="submit" class="btn btn-default" ng-click="search()">查询</button></div></div></form><!--显示查询结果-->
<div ng-show="isisshowresult"><table class="table table-striped"><thead><tr><td>序号</td><td>标题</td><td>作者</td>
<!--                <td>内容</td>--><td>关键词</td><td>链接</td><td>发布时间</td></tr></thead><tbody><tr ng-repeat="(key, item) in items"><td>{{index+key}}</td><td>{{item.title}}</td><td>{{item.author}}</td>
<!--            <td>{{item.content}}</td>--><td>{{item.keywords}}</td><td>{{item.url}}</td><td>{{item.publish_date}}</td></tr></tbody></table><div class="row">
<!--        <div class="form-group">--><div class="pull-left" style="margin-top: 12px;"><button type="submit" class="btn btn-primary" ng-click="searchsortASC()" >发布时间升序</button><button type="submit" class="btn btn-primary" ng-click="searchsortDESC()">发布时间降序</button></div>
<!--        </div>--><div class="pull-right"><nav><ul class="pagination"><li><a ng-click="Previous()" role="button"><span role="button">上一页</span></a></li><li ng-repeat="page in pageList" ng-class="{active:isActivePage(page)}" role="button"><a ng-click="selectPage(page)" >{{ page }}</a></li><li><a ng-click="Next()" role="button"><span role="button">下一页</span></a></li></ul></nav></div></div>
</div>

在news.html引入查询页面

紧接着实现查询词支持布尔表达式

// 查询数据$scope.search = function () {var title1 = $scope.title1;var title2 = $scope.title2;var selectTitle = $scope.selectTitle;var content1 = $scope.content1;var content2 = $scope.content2;var selectContent = $scope.selectContent;var sorttime = $scope.sorttime;// 检查用户传的参数是否有问题//用户有可能这样输入：___  and/or  新冠（直接把查询词输在了第二个位置）if(typeof title1=="undefined" && typeof title2!="undefined" && title2.length>0){title1 = title2;}if(typeof content1=="undefined" && typeof content2!="undefined" && content2.length>0){content1 = content2;}// 用户可能一个查询词都不输入，默认就是查找全部数据var myurl = `/news/search?t1=${title1}&ts=${selectTitle}&t2=${title2}&c1=${content1}&cs=${selectContent}&c2=${content2}&stime=${sorttime}`;$http.get(myurl).then(function (res) {if(res.data.message=='data'){$scope.isisshowresult = true; //显示表格查询结果// $scope.searchdata = res.data;$scope.initPageSort(res.data.result)}else {window.location.href=res.data.result;}},function (err) {$scope.msg = err.data;});};

现在看查询页路由

router.get('/search', function(request, response) {console.log(request.session['username']);//sql字符串和参数if (request.session['username']===undefined) {// response.redirect('/index.html')response.json({message:'url',result:'/index.html'});}else {var param = request.query;newsDAO.search(param,function (err, result, fields) {response.json({message:'data',result:result});})}
});

还需要考虑的是newsDAO.search函数

search :function(searchparam, callback) {// 组合查询条件var sql = 'select * from fetches ';if(searchparam["t2"]!="undefined"){sql +=(`where title like '%${searchparam["t1"]}%' ${searchparam['ts']} title like '%${searchparam["t2"]}%' `);}else if(searchparam["t1"]!="undefined"){sql +=(`where title like '%${searchparam["t1"]}%' `);};if(searchparam["t1"]=="undefined"&&searchparam["t2"]=="undefined"&&searchparam["c1"]!="undefined"){sql+='where ';}else if(searchparam["t1"]!="undefined"&&searchparam["c1"]!="undefined"){sql+='and ';}if(searchparam["c2"]!="undefined"){sql +=(`content like '%${searchparam["c1"]}%' ${searchparam['cs']} content like '%${searchparam["c2"]}%' `);}else if(searchparam["c1"]!="undefined"){sql +=(`content like '%${searchparam["c1"]}%' `);}if(searchparam['stime']!="undefined"){if(searchparam['stime']=="1"){sql+='ORDER BY publish_date ASC ';}else {sql+='ORDER BY publish_date DESC ';}}sql+=';';pool.getConnection(function(err, conn) {if (err) {callback(err, null, null);} else {conn.query(sql, function(qerr, vals, fields) {conn.release(); //释放连接callback(qerr, vals, fields); //事件驱动回调});}});},};

就可以在search.html中显示查询结果
下面要让爬虫数据查询结果列表支持分页

// 分页$scope.initPageSort=function(item){$scope.pageSize=5;　　//每页显示的数据量，可以随意更改$scope.selPage = 1;$scope.data = item;$scope.pages = Math.ceil($scope.data.length / $scope.pageSize); //分页数$scope.pageList = [];//最多显示5页，后面6页之后不会全部列出页码来$scope.index = 1;// var page = 1;// for (var i = page; i < $scope.pages+1 && i < page+5; i++) {//     $scope.pageList.push(i);// }var len = $scope.pages> 5 ? 5:$scope.pages;$scope.pageList = Array.from({length: len}, (x,i) => i+1);//设置表格数据源(分页)$scope.items = $scope.data.slice(0, $scope.pageSize);};

可以看出来。在进行初始化的时候对每页显示的数据量进行了一个5为极限的限制，并且对显示的页数也进行了一个5为极限的限制。这个可以根据情况修改。

//打印当前选中页$scope.selectPage = function (page) {//不能小于1大于最大（第一页不会有前一页，最后一页不会有后一页）if (page < 1 || page > $scope.pages) return;//最多显示分页数5，开始分页转换var pageList = [];if(page>2){for (var i = page-2; i <= $scope.pages && i < page+3; i++) {pageList.push(i);}}else {for (var i = page; i <= $scope.pages && i < page+5; i++) {pageList.push(i);}}$scope.index =(page-1)*$scope.pageSize+1;$scope.pageList = pageList;$scope.selPage = page;$scope.items = $scope.data.slice(($scope.pageSize * (page - 1)), (page * $scope.pageSize));//通过当前页数筛选出表格当前显示数据console.log("选择的页：" + page);};

同时限制第一页不会有上一页，最后一页也不会有下一页，在跳转的时候数字进行变化，图标进行转换。

//设置当前选中页样式$scope.isActivePage = function (page) {return $scope.selPage == page;};//上一页$scope.Previous = function () {$scope.selectPage($scope.selPage - 1);};//下一页$scope.Next = function () {$scope.selectPage($scope.selPage + 1);};$scope.searchsortASC = function () {$scope.sorttime = '1';$scope.search();};$scope.searchsortDESC = function () {$scope.sorttime = '2';$scope.search();};

这是很基础的分页，更复杂高效的版本还需要更多的练习与琢磨。

之后需要用Echarst添加相应的四个数据分析图表，即饼状图、折线图、柱状图、词云这四种。

下面以柱状图为例：

 $scope.histogram = function () {$scope.isShow = false;$http.get("/news/histogram").then(function (res) {if(res.data.message=='url'){window.location.href=res.data.result;}else {// var newdata = washdata(data);let xdata = [], ydata = [], newdata;var pattern = /\d{4}-(\d{2}-\d{2})/;res.data.result.forEach(function (element) {// "x":"2020-04-28T16:00:00.000Z" ,对x进行处理,只取 月日xdata.push(pattern.exec(element["x"])[1]);ydata.push(element["y"]);});newdata = {"xdata": xdata, "ydata": ydata};var myChart = echarts.init(document.getElementById('main1'));// 指定图表的配置项和数据var option = {title: {text: '新闻发布数 随时间变化'},tooltip: {},legend: {data: ['新闻发布数']},xAxis: {data: newdata["xdata"]},yAxis: {},series: [{name: '新闻数目',type: 'bar',data: newdata["ydata"]}]};// 使用刚指定的配置项和数据显示图表。myChart.setOption(option);}},function (err) {$scope.msg = err.data;});};

还有路由，如下：

router.get(’/histogram’, function(request, response) {
//sql字符串和参数
console.log(request.session[‘username’]);
//sql字符串和参数
if (request.session['username']===undefined) {// response.redirect('/index.html')response.json({message:'url',result:'/index.html'});
}else {var fetchSql = "select publish_date as x,count(publish_date) as y from fetches group by publish_date order by publish_date;";newsDAO.query_noparam(fetchSql, function (err, result, fields) {response.writeHead(200, {"Content-Type": "application/json","Cache-Control": "no-cache, no-store, must-revalidate","Pragma": "no-cache","Expires": 0});response.write(JSON.stringify({message:'data',result:result}));response.end();});
}

最后一步，就是要实现用户注册、登录、查询等操作记入数据库中的日志。
直接在app.js中引入var logger = require('morgan’);

app.use(logger(function (tokens, req, res) {console.log('打印的日志信息：');var request_time = new Date();var request_method = tokens.method(req, res);var request_url = tokens.url(req, res);var status = tokens.status(req, res);var remote_addr = tokens['remote-addr'](req, res);if(req.session){var username = req.session['username']||'notlogin';}else {var username = 'notlogin';}// 直接将用户操作记入mysql中if(username!='notlogin'){logDAO.userlog([username,request_time,request_method,request_url,status,remote_addr], function (success) {console.log('成功保存！');})}

现在登录mysql，还可以进行打印表格
实践开始时，
进入final_project文件夹，cmd运行node bin/www

进入http://localhost:3000/注册，随后登录。

开始进行搜索
接下来看图表