第一种(java8)：遍历JSONArray 拼接字符串

public static void main(String[] args) {

JSONArray jSONArray = new JSONArray();

JSONObject jb = new JSONObject();

jb.put("id", 1);

jb.put("name", "s");

jSONArray.add(jb);

JSONObject j1 = new JSONObject();

j1.put("id", 2);

j1.put("name", "s");

jSONArray.add(j1);

StringBuffer sBuffer = new StringBuffer();

jSONArray.stream().forEach(jsonobejct->arrayIdToString((JSONObject) jsonobejct,sBuffer));

System.out.println(sBuffer.toString());

}

private static StringBuffer arrayIdToString(JSONObject jsonobejct,

StringBuffer sBuffer) {

return sBuffer.append(jsonobejct.getInteger("id")).append(",");

}

第二种：for循环遍历

public static void f2(JSONArray ja) {

for(