How To Implement a progress bar using Spring 3 MVC?

Question

Can anyone teach me or direct to a working example to satisfy this requirement.

Scenario:

1. List item My Web App is using spring mvc.
2. One of the ser

Answer 1

Here is a possible solution to this progress bar problem:

task.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="form" uri="http://www.springframework.org/tags/form"%>


    

        

        

    
    

      


        
Progress Bar Example
        

          

            
0%
          
        

        
        


        

          Actions
          

            Start
            Stop
          
        

        
        

      

      

    

TaskController.java

@Controller
@RequestMapping(value = "/task")
public class TaskController {

    private Task task;

    @RequestMapping("")
    protected ModelAndView page() {
        ModelAndView model = new ModelAndView(VIEW_DIR + "task");

        if (this.task == null) {
            this.task = new Task();
        }

        model.addObject("task", this.task);

        return model;
    }

    @RequestMapping(value = "/status", method = GET)
    public @ResponseBody
    String getStatus() {

        return task.getStatus();
    }

    @RequestMapping(value = "/progress", method = GET)
    public @ResponseBody
    int getProgress() {

        return task.getProgress();
    }

    public ModelAndView form(@ModelAttribute Task task) {

        this.task = task;

        ModelAndView model = new ModelAndView(VIEW_DIR + "task");

        task.execute();

        model.addObject("task", this.task);

        return model;
    }

}

Task.java

public class Task {

    private int total;
    private int progress;
    private String status;

    public Task() {
        this.status = "created";

        // TODO get total here or pass via form
    }

    public void execute() {

        status = "executing";

        int i = 0;

        while (i < total && status.equals("executing")) {

            progress = (100 * (i + 1) / total);

            i++;
        }
    }

    public int getTotal() {
        return total;
    }

    public void setTotal(int total) {
        this.total = total;
    }

    public int getProgress() {
        return progress;
    }

    public void setProgress(int progress) {
        this.progress = progress;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }
}