Java 代码计算 Polygon 面积

package com.common.argis;
import java.io.IOException;

/**
 * 计算 polygons 的面积
 *
 * @param polygons 格式：[geo1,geo2...]
 * @return
 * @throws IOException
 */
public static String callGeoAreaService(String polygons) throws Exception {
    polygons = polygons.replaceAll(" ", "");
    String[] rings = polygons.split("},\\{");
    Double tempArea = 0d;
    for(int k = 0; k < rings.length; k){
        rings[k] = rings[k].replaceAll("\\{", "");
        rings[k] = rings[k].replaceAll("}", "");
        int end_i = rings[k].indexOf(