参考： 1) HttpRequest中常见的四种ContentType: https://www.cnblogs.com/htoooth/p/7242217.html https://www.cnblogs.com/hejingjing/p/6956906.html https://www.cnblogs.com/xiaozong/p/5732332.html 2) Http中Content-Type的详解: https://blog.csdn.net/danielzhou888/article/details/72861097 3) 常用HTTP contentType与后端处理方式 https://www.jianshu.com/p/dc6873d5fa3d https://www.jianshu.com/p/dc6873d5fa3d 4) AJAX对于JAVA接收HttpServletRequest和json字符串两种方式的传递写法 https://blog.csdn.net/wohaqiyi/article/details/79284106 5) ContentType <