java - 如何清除 json 字符串中的多个转义字符？

Question

我有一个从 JSON 对象转换而来的字符串，该字符串在每个变量之前都有多个转义字符。我找到了删除一组转义字符的解决方案。如何清理和格式化我的 json 字符串？

这是我的字符串的样子:

{"formFactor":"{\"form_factor_type\":\"SOMETHING\",\"payment_card\":\"{\\"SOMETHING\\":\\"NOTPRESENT\\",\\"card_holder_present\\":\\"NOTPRESENT\\",\\"UUID\\":\\"SOMETHING\\",\\"instrument_id\\":\\"SOMETHING\\",\\"signature_id\\":\\"SOMETHING\\"}\"}","txnCharacteristicsAmt":"[\"{\\"amount\\":\\"{\\\\"amount\\\\":\\\\"00\\\\",\\\\"code\\\\":\\\\"USD\\\\"}\\",\\"type\\":\\"CASH_OVER\\"}\"]","pmtCardInfo":"{\"card_present\":\"PRESENT\",\"card_holder_present\":\"PRESENT\",\"UUID\":\"SOMETHING\",\"instrument_id\":\"SOMETHING\"}","terminalInfo":"{\"cardholder_authentication_capability_used\":\"SIGNATURE\",\"pin_entry_capability\":\"UNKNOWN\",\"operating_environment\":\"ADMINISTRATIVE_TERMINAL\",\"terminal_id\":\"SOMETHING\",\"pan_entry_mode\":\"FULL_MAGNETIC_STRIPE\",\"card_data_entry_capability\":\"UNKNOWN\",\"pos_condition_code\":\"UNSPECIFIED\",\"cardholder_authentication_capability\":\"UNKNOWN\",\"pos_entry_mode\":\"FULL_MAGNETIC_STRIPE\",\"card_data_entry_capability_used\":\"UNKNOWN\"}","is_dyson_present":"SOMETHING","productInfo":"{\"tenant\":\"SOMETHING\",\"integration\":\"SOMETHING\",\"product_name\":\"SOMETHING\",\"tokenized_value_type\":\"SOMETHING\"}","cashOverAmount":"SOMETHING","counterPrtyAccNum":"SOMETHING","merchantDetails":"{\"merchant_address\":\"{\\"state\\":\\"SOMETHING\\",\\"address1\\":\\"SOMETHING\\",\\"city\\":\\"SOMETHING\\",\\"iso_country\\":\\"US\\"}\",\"merchant_category_code\":\"SOMETHING\",\"merchant_name\":\"SOMETHING\",\"issuer_list\":\"[\\"SOMETHING\\"]\",\"external_merchant_id\":\"SOMETHING\",\"acquiring_institution_country_code\":\"US\"}}

Answer 1

无论是谁生成了这个字符串，都搞砸了。糟糕!!

每个嵌套对象都独立转换为 JSON 文本，然后将该文本分配为字符串值，而不是将整个对象层次结构转换为单个 JSON 结构。

然后，他们错误地对嵌套字符串进行编码，导致生成错误的 JSON。显然他们没有使用好的 JSON 库。

正确的解决方案是修复生成该字符串的代码。

下面是为人类可读而格式化的字符串。问题在于根对象以 formFactor 字段开头。它的值是一个对象，但该对象不是将对象作为字段值，而是将其转换为 JSON 文本，并且 formFactor 字段将文本作为其值。对第二个字段 ( payment_card ) 重复此操作，但转义错误:

"formFactor":"{
    \"form_factor_type\":\"SOMETHING\",
    \"payment_card\":\"{
        \\"SOMETHING\\":\\"NOTPRESENT\\",
        \\"card_holder_present\\":\\"NOTPRESENT\\",
        \\"UUID\\":\\"SOMETHING\\",
        \\"instrument_id\\":\\"SOMETHING\\",
        \\"signature_id\\":\\"SOMETHING\\"
    }\"
}"

双重嵌套对象的 JSON 文本编码不正确。要了解这一点，让我们从内部开始。 payment_card 对象是:

{
    "SOMETHING": "NOTPRESENT",
    "card_holder_present": "NOTPRESENT",
    "UUID": "SOMETHING",
    "instrument_id": "SOMETHING",
    "signature_id": "SOMETHING"
}

当该文本被编码为 formFactor 对象的 JSON 字符串时，所有引号 (") 都会被转义:

{
    "form_factor_type": "SOMETHING",
    "payment_card": "{
        \"SOMETHING\": \"NOTPRESENT\",
        \"card_holder_present\": \"NOTPRESENT\",
        \"UUID\": \"SOMETHING\",
        \"instrument_id\": \"SOMETHING\",
        \"signature_id\": \"SOMETHING\"
    }"
}

当该文本再次编码为根对象的 formFactor 字段的 JSON 字符串时，所有反斜杠 (\) 和引号 (") 被转义:

"formFactor": "{
    \"form_factor_type\": \"SOMETHING\",
    \"payment_card\": \"{
        \\\"SOMETHING\\\": \\\"NOTPRESENT\\\",
        \\\"card_holder_present\\\": \\\"NOTPRESENT\\\",
        \\\"UUID\\\": \\\"SOMETHING\\\",
        \\\"instrument_id\\\": \\\"SOMETHING\\\",
        \\\"signature_id\\\": \\\"SOMETHING\\\"
    }\"
}"

但正如您所看到的，事实并非如此。您的字符串中的反斜杠 (\) 数量错误，即您的字符串已损坏。

修复生成字符串的代码。通过正确转义多重嵌套字符串，或不独立地将嵌套对象转换为JSON 文本。我建议第二种选择，即上面的内容应该是:

"formFactor": {
    "form_factor_type": "SOMETHING",
    "payment_card": {
        "SOMETHING": "NOTPRESENT",
        "card_holder_present": "NOTPRESENT",
        "UUID": "SOMETHING",
        "instrument_id": "SOMETHING",
        "signature_id": "SOMETHING"
    }
}

完整格式化字符串

{
    "formFactor":"{
        \"form_factor_type\":\"SOMETHING\",
        \"payment_card\":\"{
            \\"SOMETHING\\":\\"NOTPRESENT\\",
            \\"card_holder_present\\":\\"NOTPRESENT\\",
            \\"UUID\\":\\"SOMETHING\\",
            \\"instrument_id\\":\\"SOMETHING\\",
            \\"signature_id\\":\\"SOMETHING\\"
        }\"
    }",
    "txnCharacteristicsAmt":"[
        \"{
            \\"amount\\":\\"{
                \\\\"amount\\\\":\\\\"00\\\\",
                \\\\"code\\\\":\\\\"USD\\\\"
            }\\",
            \\"type\\":\\"CASH_OVER\\"
        }\"
    ]",
    "pmtCardInfo":"{
        \"card_present\":\"PRESENT\",
        \"card_holder_present\":\"PRESENT\",
        \"UUID\":\"SOMETHING\",
        \"instrument_id\":\"SOMETHING\"
    }",
    "terminalInfo":"{
        \"cardholder_authentication_capability_used\":\"SIGNATURE\",
        \"pin_entry_capability\":\"UNKNOWN\",
        \"operating_environment\":\"ADMINISTRATIVE_TERMINAL\",
        \"terminal_id\":\"SOMETHING\",
        \"pan_entry_mode\":\"FULL_MAGNETIC_STRIPE\",
        \"card_data_entry_capability\":\"UNKNOWN\",
        \"pos_condition_code\":\"UNSPECIFIED\",
        \"cardholder_authentication_capability\":\"UNKNOWN\",
        \"pos_entry_mode\":\"FULL_MAGNETIC_STRIPE\",
        \"card_data_entry_capability_used\":\"UNKNOWN\"
    }",
    "is_dyson_present":"SOMETHING",
    "productInfo":"{
        \"tenant\":\"SOMETHING\",
        \"integration\":\"SOMETHING\",
        \"product_name\":\"SOMETHING\",
        \"tokenized_value_type\":\"SOMETHING\"
    }",
    "cashOverAmount":"SOMETHING",
    "counterPrtyAccNum":"SOMETHING",
    "merchantDetails":"{
        \"merchant_address\":\"{
            \\"state\\":\\"SOMETHING\\",
            \\"address1\\":\\"SOMETHING\\",
            \\"city\\":\\"SOMETHING\\",
            \\"iso_country\\":\\"US\\"
        }\",
        \"merchant_category_code\":\"SOMETHING\",
        \"merchant_name\":\"SOMETHING\",
        \"issuer_list\":\"[
            \\"SOMETHING\\"
        ]\",
        \"external_merchant_id\":\"SOMETHING\",
        \"acquiring_institution_country_code\":\"US\"
    }
}