Question

当readcsv操作正在运行时，处理数据需要几分钟，具体取决于文件大小，因此在执行时我想知道如何向用户显示消息，告诉他们数据正在进行中.. thx

 def readcsv() {
    redirect(action: "list")
    flash.message = "okokokok"
    def list = []
    def dir = new File("C:/Users/User/Desktop/Summarize_20141212/ONE_FILE")
    dir.eachFileRecurse (FileType.FILES) { file ->
        list << file
    }
    list.each {
    File file = new File(it.path)
    def sql = groovy.sql.Sql.newInstance("jdbc:postgresql://localhost:5432/new",
            'postgres', 'sa', "org.postgresql.Driver")
    def linecount = 0
    file.eachLine() { line ->
        if (line.trim().size() == 0) {
            return null
        } else {
            def field = []
            def tokens = line.split(',(?=([^\"]*\"[^\"]*\")*[^\"]*$)')
            file.name.lastIndexOf('.').with { it != -1 ? file.name[0..<it] : file.name }
            linecount++
            field.push(file.name)

            for (String t : tokens) {

                field.push(t)
            }
            while (field.size() < 10) {
                field.push("")
            }
            if (linecount > 1) {
                sql.execute('insert into read_csv(version,col1,col2,col3,col4,col5,col6,col7,col8,col9,col10) ' +
                        'VALUES (0,?,?,?,?,?,?,?,?,?,?)', field)
                System.out.println(field);
            }
        }
    }
    }

}

Answer 1

您应该将csv阅读器的功能真正转移到服务中并让控制器调用它。可能性可能是使用async：

class MyController {
def myService
def readcsv() {

def asyncProcess = new Thread({
    myService.readCSV(filename, input2,input3) 
  } as Runnable )

asyncProcess.start() 
forward (action: 'list')    
//render "Your file is being processed"


 //forward (controller:"someController", action: 'someAction', model [param1: params.param1 param2: param2:params.param2 ])

}

在此处阅读异步：http://grails.org/doc/latest/guide/async.html

除了你的前锋，你可以使用以下变化

渲染：渲染然后加载到您希望显示的实际页面而不是当前操作...所以在这种情况下列表

render (view: 'list', model: [params:params])

或者甚至可能

链：http://grails.org/doc/2.4.x/ref/Controllers/chain.html

chain(action: "details", model: [book: shawshankRedemption])

最后重定向

redirect (controller: 'admin', action: 'welcome')
redirect(url: request.getHeader('referer'))
redirect(action: "show", id: some.id)
redirect(action: "list", params: params)

Answer 2

这里是在进程运行时实际显示渲染消息的编码，如果我想在处理后显示def list（）页面，该怎么做？如果我只是在最后添加redict渲染消息将不再显示.. ....

def readcsv() {
        def asyncProcess = new Thread({
            def list = []
            def dir = new File("C:/Users/User/Desktop/Summarize_20141212/ONE_FILE")
            dir.eachFileRecurse(FileType.FILES) { file ->
                list << file
            }
            list.each {
                File file = new File(it.path)
                def sql = groovy.sql.Sql.newInstance("jdbc:postgresql://localhost:5432/new",
                        'postgres', 'sa', "org.postgresql.Driver")
                def linecount = 0
                file.eachLine() { line ->
                    if (line.trim().size() == 0) {
                        return null
                    } else {
                        def field = []
                        def tokens = line.split(',(?=([^\"]*\"[^\"]*\")*[^\"]*$)')
                        file.name.lastIndexOf('.').with { it != -1 ? file.name[0..<it] : file.name }
                        linecount++
                        field.push(file.name)

                        for (String t : tokens) {

                            field.push(t)
                        }
                        while (field.size() < 10) {
                            field.push("")
                        }
                        if (linecount > 1) {
                            sql.execute('insert into read_csv(version,col1,col2,col3,col4,col5,col6,col7,col8,col9,col10) ' +
                                    'VALUES (0,?,?,?,?,?,?,?,?,?,?)', field)
                            System.out.println(field);
                        }

                    }

                }
            }
        } as Runnable )
        asyncProcess.start()
        render "Your file is being processed"


    }

当控制器动作运行时，显示用户消息

2 个答案: