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對象轉換成json字符串

writer val object style pre json字符串 bsp default ada

String requestJson = JSONObject.toJSONString(metadata);
//或者
ObjectMapper mapper = new ObjectMapper();
ObjectWriter ow = mapper.writer().withDefaultPrettyPrinter();
String requestJson = ow.writeValueAsString(metadata);

對象轉換成json字符串