JAVA获取json中的值

一段JSON以下所示：java {"code":100,"data":{"grdbl":100.0,"bxl":646,"fwl":0,"mytsl":0}} 获取json值代码以下：json String a="{"code":100,"data":{"grdbl":100.0,"bxl":646,"fwl":0,"mytsl":0}}";

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