报错堆栈：

Illegal unquoted character ((CTRL-CHAR, code 10)): has to be escaped using backslash to be included in string value\n at [Source: (org.apache.cxf.transport.http.AbstractHTTPDestination$1); line: 3, column: 34

报错原因：

字符串中包含换行 '\n'

解决办法：

1.在'\n'之前加转义符号'\'；

2.ObjectMapper MAPPER = new ObjectMapper();给MAPPER设置一个属性 MAPPER.configure(com.fasterxml.jackson.core.JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true);