String body="{\"authInfo\":{\"appKey\":\""+appKey+"\",\"accessToken\":\""+token+"\"},\"apiName\":\"querysettlementbillservice\",\"requestContent\":{\"accountID\":\"543946\",\"dateInBatch\":\"20230501\",\"orderType\":1,\"batchNo\":\"\",\"payType\":\"Y\",\"pageToken\":\"\"}}"; 怎样将body里面null转空字符串

在给定的代码中，要将body字符串中的null转换为空字符串，可以使用replace方法。具体代码如下：

String body = "{\"authInfo\":{\"appKey\":\"" + appKey + "\",\"accessToken\":\"" + token + "\"},\"apiName\":\"querysettlementbillservice\",\"requestContent\":{\"accountID\":\"543946\",\"dateInBatch\":\"20230501\",\"orderType\":1,\"batchNo\":\"\",\"payType\":\"Y\",\"pageToken\":\"\"}}";
String modifiedBody = body.replace("null", "\"\"");

在上述代码中，使用replace方法将字符串中的"null"替换为""，即空字符串。这样就可以将body字符串中的null转换为空字符串。
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