json通过实体类转换时出现的异常

1、空值转换-异常情况：
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Can not instantiate value of type [map type; class java.util.HashMap, [simple type, class java.lang.String] -> [simple type, class java.lang.String]] from JSON String; no single-String constructor/factory method
解决方法，在ObjectMapper配置中增加：
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mapper.configure(DeserializationConfig.Feature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true) ;

2、转义字符-异常情况：
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org.codehaus.jackson.JsonParseException: Illegal unquoted character ((CTRL-CHAR, code 9)): has to be escaped using backslash to be included in string value
at [Source: java.io.StringReader@10cfc2e3; line: 1, column: 2461]
解决办法，在ObjectMapper配置中增加：
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mapper.configure(Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true) ;