java中 {"town":"园洲镇","city":"惠州市","county":"博罗县","mobile":"135*******6","telephone":"135*******6","cityId":"1643","townId":"36223","provinceId":"19","province":"广东","countyId":"36178","fullAddress":"AAT0P3HQPvKlCnegRFUk5bdiTJbIaVk36X/dm1Lzow6CvV38aGkQP1IXB+qzFkBLdLlFw+TjBoQXP5mLqjo0liarZremN5TPr4sUvuFvPnRV+30+TSuq5+1njoKXxE+aSxU=","fullname":"AAT0P3HQPvKlCnegRFUk5bdigtJlCHYkgy61jPcmo4ckvZ2QT+BSRb+cAq675jWKaSs=","desen_telephone":"666231fb1639e30370794864bd6e91f23feb661e25ce7a235d5647a76512e64c9b20c3","desen_mobile":"666231fb1639e30370794864bd6e91f23feb661e25ce7a235d5647a76512e64c9b20c3"} 我想把这个json某个key改一个值 ,怎么改方便

你可以使用Java中的JSON库来解析和修改JSON字符串。以下是一个示例代码：

import org.json.JSONObject;

public class ModifyJson {
    public static void main(String[] args) {
        String jsonStr = "{\"town\":\"园洲镇\",\"city\":\"惠州市\",\"county\":\"博罗县\",\"mobile\":\"135*******6\",\"telephone\":\"135*******6\",\"cityId\":\"1643\",\"townId\":\"36223\",\"provinceId\":\"19\",\"province\":\"广东\",\"countyId\":\"36178\",\"fullAddress\":\"AAT0P3HQPvKlCnegRFUk5bdiTJbIaVk36X/dm1Lzow6CvV38aGkQP1IXB+qzFkBLdLlFw+TjBoQXP5mLqjo0liarZremN5TPr4sUvuFvPnRV+30+TSuq5+1njoKXxE+aSxU=\",\"fullname\":\"AAT0P3HQPvKlCnegRFUk5bdigtJlCHYkgy61jPcmo4ckvZ2QT+BSRb+cAq675jWKaSs=\",\"desen_telephone\":\"666231fb1639e30370794864bd6e91f23feb661e25ce7a235d5647a76512e64c9b20c3\",\"desen_mobile\":\"666231fb1639e30370794864bd6e91f23feb661e25ce7a235d5647a76512e64c9b20c3\"}";

        JSONObject jsonObj = new JSONObject(jsonStr);

        // 修改mobile的值
        jsonObj.put("mobile", "137*******8");

        // 打印修改后的JSON字符串
        System.out.println(jsonObj.toString());
    }
}

在这个示例代码中，我们首先使用JSONObject类将JSON字符串转换为Java对象。然后，我们使用put方法修改mobile键的值。最后，我们使用toString方法将修改后的JSONObject对象转换回JSON字符串，并打印输出。