利用java怎么将二维数组转换为json

package Tsets;
public class erweiTojson {
 public static void main(String[] args) {
  String[][] blogList = {
   {"2008/07/07", "NetBeans New and Cool", "Tim Boudreau"},
   {"2008/07/07", "NetBeans Mobility", "Ada Li"},
   {"2008/07/07", "Creating Web 2.0 Rich Internet Applications", "Michael Li"},
   {"2008/07/08", "AJAX and JSF", "Ada Li"},
   {"2008/07/09", "Ruby on Rails in the Enterprise", "Liang Ye"},
   {"2008/07/09", "Beans Binding and the Swing Application Framework", "Joey Shen"}
  };
  StringBuffer sb = new StringBuffer();
  boolean first = true;
  sb.append("[");
  for (int i = 0; i < blogList.length; i++) {
   String[] blogItem = blogList[i];
   if (!first) {
    sb.append(",");
   }
   sb.append("{");
   sb.append("postdate: '" + blogItem[0] + "', ");
   sb.append("title: '" + blogItem[1] + "', ");
   sb.append("author: '" + blogItem[2] + "' ");
   sb.append("}");
   first = false;
  }
  sb.append("]");
  System.out.println(sb.toString());
 }
}