解決springboot項目base64文件上傳限制

最近用到springboot項目，通過base64轉字符串上傳圖片，遇到問題，報如下錯誤：

org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is java.lang.IllegalStateException: org.apache.tomcat.util.http.fileupload.FileUploadBase$FileSizeLimitExceededException: The field file exceeds its maximum permitted size of 1048576 bytes.
    at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.parseRequest(StandardMultipartHttpServletRequest.java:111)
    at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.<init>(StandardMultipartHttpServletRequest.java:85)

看了這個錯誤，感覺是springboot內置的tomcat給限制了，於是在application配置文件添加如下參數：

以1.5.4爲例，設置單個文件大小爲50M限制，總上傳的數據大小爲100M，如下：

spring.http.multipart.max-file-size=50MB
spring.http.multipart.max-request-size=100MB

再以2.0.1爲例，設置單個文件大小爲10M限制，總上傳的數據大小也爲100M，如下：

spring.servlet.multipart.max-file-size=10MB

spring.servlet.multipart.max-request-size=100MB

配置完以後結果又報另一個錯：

java.lang.IllegalStateException: The multi-part request contained parameter data (excluding uploaded files) that exceeded the limit for maxPostSize set on the associated connector

從網上找到修改Spring Boot內置Tomcat的maxPostsize值，那就在application.properties中加上這句話：

server.tomcat.max-http-post-size=0
server.maxHttpHeaderSize=102400000   //設定HttpHeader請求頭大小
server.maxHttpPostSize =102400000   //設定Httppost數據大小