Spring Boot+AngularJS+BootStrap实现进度条
原理
进度条的原理是在上传文件的时候,当程序运行到某一个部分,往Session中设置一个1到100的值。然后前台再每隔很小的一段时间去请求这个值。
在AngularJS中,$http对象有3种状态,分别是success,progress,error,其中progress方法就会在success方法调用之前(也就是上传完成之前),不断地调用。而我们要做的就是在progress中在添加一个请求,去后台拿我们设置在session中的值。
代码,这里我用了一个插件用来上传文件,叫ng-file-upload
html
<uib-progress data-ng-show="progress">
<uib-bar value="progress" type="{{type}}" data-ng-bind="progress + '%'"/>
<uib-bar value="progress" type="{{type}}" data-ng-bind="progress + '%'"/>
js
方法
$scope.isShowMsg = true;
$scope.Msg = res.data.msg;
if($scope.Msg == "导入数据不符合格式要求!")
$scope.type = "progress-bar progress-bar-danger progress-bar-striped";//设置进度条样式
else {
$scope.type = "progress-bar progress-bar-success progress-bar-striped";
$scope.progress = 100;//上传成功之后,将进度条设置为100
}
},function (){
//这里是error<a href="/tag/fangfa/" target="_blank" class="keywords">方法</a>
},function (){
//这里是progress<a href="/tag/fangfa/" target="_blank" class="keywords">方法</a>
$scope.type = "progress-bar progress-bar-info progress-bar-striped";
$http({
url:"",method: "get"
}).success(function (res) {
$scope.progress = res;//绑定进度条的值
})
});
batchModify(InputStream inputStream,HttpSession session) {
Map res = new HashMap<>();
Workbook workbook = null;
try {
workbook = Util.createWorkbook(inputStream);
} catch (InvalidFormatException | IOException e) {
e.printStackTrace();
}
session.setAttribute("progress",5);//解析成功后我将进度设置为5
Sheet sheet = workbook.getSheetAt(0);
Map<String,Object> roleWithPages = new HashMap<>();
for (int i = 1; i <= sheet.getLastRowNum(); i++) {
Row r = sheet.getRow(i);
if (r == null || r.getCell(0) == null || r.getCell(1) == null)
continue;
Set<Page> pages = null;
if (roleWithPages.get(r.getCell(0).toString()) == null) {
pages = new HashSet<>();
} else {
pages = (Set<Page>) roleWithPages.get(r.getCell(0).toString());
}
Page p = new Page();
p.setId(Math.round(r.getCell(1).getNumericCellValue()));
pages.add(p);
roleWithPages.put(r.getCell(0).toString(),pages);
session.setAttribute("progress",5 + i*90/sheet.getLastRowNum());
//我将处理<a href="/tag/wenjian/" target="_blank" class="keywords">文件</a>主体进度总量设置为90(5是<a href="/tag/jiashang/" target="_blank" class="keywords">加上</a>解析部分的进度)
}
List<Role> roles = new ArrayList<>();
for (String rolename : roleWithPages.keySet()) {
Role role = repo.findByName(rolename);
role.setPages((Set<Page>) roleWithPages.get(rolename));
roles.add(role);
}
repo.save(roles);
session.setAttribute("progress",100);//保存之后将进度设置为100
res.put("msg","数据导入成功!");
return res;
}
进度条部分代码,很简单,就是读Session中progress的值