后台如何返给前台“饼状图格式”的数据？

前端要求格式：

 data: [
        { value: 1048, name: 'Search Engine'},
        { value: 735, name: 'Direct' },
        { value: 580, name: 'Email' },
        { value: 484, name: 'Union Ads'},
        { value: 300, name: 'Video Ads'}
      ]

展示效果：

后端处理：

class DataPoint {  private int value;  private String name;  public DataPoint(int value, String name) {  this.value = value;  this.name = name;  }  public int getValue() {  return value;  }  public String getName() {  return name;  }  @Override  public String toString() {  return "{ value: " + value + ", name: '" + name + "' }";  }  
}  public class Main {  public static void main(String[] args) {  List<DataPoint> dataList = new ArrayList<>();  dataList.add(new DataPoint(1048, "Search Engine"));  dataList.add(new DataPoint(735, "Direct"));  dataList.add(new DataPoint(580, "Email"));  dataList.add(new DataPoint(484, "Union Ads"));  dataList.add(new DataPoint(300, "Video Ads"));  // 输出数据  for (DataPoint dataPoint : dataList) {  System.out.println(dataPoint);  }  }  
}