我们最近从Jackson json 2.8.2转移到2.9.4，我们看到了行为的重大变化。我们使用的是JDK 1.8。
之前我们在对象映射器级别将Serialization包含设置为NON_DEFAULT，并且所有工作正常。
现在更改为2.9.2之后，NON_DEFAULT忽略了所有默认值，如布尔值false，整数0，......这打破了我们的测试用例。
我们的要求是只忽略空字段和空白字段，如返回[]。
但我们仍然希望不要忽略空字符串，例如test =＆＃34;＆＃34;
我们尝试了non_empty，non_absent都忽略了每个字段（null，[]，＆＃34;＆＃34;）。
您能否建议我们如何定制序列化行为以满足我们的要求？如果您需要任何进一步的细节，请告诉我。
答案 0 :(得分：0)
几种方式：
// NodeJS implementation of crypto, I'm sure google's
// cryptoJS would work equally well.
var crypto = require('crypto');
// The value stored in [dbo].[AspNetUsers].[PasswordHash]
var hashedPwd = "ADOEtXqGCnWCuuc5UOAVIvMVJWjANOA/LoVy0E4XCyUHIfJ7dfSY0Id+uJ20DTtG+A==";
var hashedPasswordBytes = new Buffer(hashedPwd, 'base64');
var hexChar = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F"];
var saltString = "";
var storedSubKeyString = "";
// build strings of octets for the salt and the stored key
for (var i = 1; i < hashedPasswordBytes.length; i++) {
if (i > 0 && i <= 16) {
saltString += hexChar[(hashedPasswordBytes[i] >> 4) & 0x0f] + hexChar[hashedPasswordBytes[i] & 0x0f]
}
if (i > 0 && i > 16) {
storedSubKeyString += hexChar[(hashedPasswordBytes[i] >> 4) & 0x0f] + hexChar[hashedPasswordBytes[i] & 0x0f];
}
}
if (storedSubKeyString === '') { return false }
// password provided by the user
var password = 'welcome1';
// TODO remove debug - logging passwords in prod is considered
// tasteless for some odd reason
console.log('cleartext: ' + password);
console.log('saltString: ' + saltString);
console.log('storedSubKeyString: ' + storedSubKeyString);
// This is where the magic happens.
// If you are doing your own hashing, you can (and maybe should)
// perform more iterations of applying the salt and perhaps
// use a stronger hash than sha1, but if you want it to work
// with the [as of 2015] Microsoft Identity framework, keep
// these settings.
var nodeCrypto = crypto.pbkdf2Sync(new Buffer(password), new Buffer(saltString, 'hex'), 1000, 256, 'sha1');
// get a hex string of the derived bytes
var derivedKeyOctets = nodeCrypto.toString('hex').toUpperCase();
console.log("hex of derived key octets: " + derivedKeyOctets);
// The first 64 bytes of the derived key should
// match the stored sub key
if (derivedKeyOctets.indexOf(storedSubKeyString) === 0) {
console.info("passwords match!");
} else {
console.warn("passwords DO NOT match!");
}
指定不同的设置：查看String.class;这是ObjectMapper.configOverrides(String.class)的设定者（具有各种工厂方法的类型）。您可以将其设置为JsonInclude.Value（或JsonInclude.Include.NON_NULL），即使默认为其他ALWAYS注册自定义序列化程序，覆盖/重新定义其String方法，不要将空字符串视为isEmpty(SerializerProvider, String)以排除