突然发现RequestBody接受参数中文乱码了，本地没问题，服务器上总是报错，并且只有中文大于3个字符才报错，奇怪

Caused by: com.fasterxml.jackson.core.JsonParseException: Invalid UTF-8 start byte 0xa4
 at [Source: (PushbackInputStream); line: 1, column: 24]
        at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1851)
        at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:707)
        at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._reportInvalidInitial(UTF8StreamJsonParser.java:3601)

看了linux服务器的编码，尽然是GBK，然后springboot代码里面明明用的UTF-8还不会自动切换，无语了，只能在启动脚本加上

public static void main(String[] args) {
        //解决linux服务器编码不是UTF-8会导致springboot @RequestBody获取参数乱码的问题
        System.setProperty("file.encoding","UTF-8");
        try {
            Field charset = Charset.class.getDeclaredField("defaultCharset");
            charset.setAccessible(true);
            charset.set(null,null);
        }catch(Exception e){
            e.printStackTrace();
        }
        SpringApplication.run(MdpMgrServerApplication.class, args);
    }

然后就可以了