Page directive must not have multiple occurrences of pageencoding-蒲公英云

Page directive must not have multiple occurrences of pageencoding

启动项目的时候，jsp文件出现以下错误：
Page directive must not have multiple occurrences of pageencoding

详细描述：

type Exception report
message /index.jsp (line: 45, column: 8) Page directive must not have multiple occurrences of pageencoding
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /index.jsp (line: 45, column: 8) Page directive must not have multiple occurrences of pageencoding
    org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
    org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:443)
    org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:103)
    org.apache.jasper.compiler.Validator$DirectiveVisitor.visit(Validator.java:196)
    org.apache.jasper.compiler.Node$PageDirective.accept(Node.java:589)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2392)
    org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2444)
    org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2450)
    org.apache.jasper.compiler.Node$Root.accept(Node.java:474)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2392)
    org.apache.jasper.compiler.Validator.validateDirectives(Validator.java:1805)
    org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:196)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:374)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:341)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:660)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:364)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

错误原因是：Page指令不得多次出现pageencoding，也就是pageEncoding重复设置了。
解决办法：Ctrl+F下搜索pageEncoding元素，是否一个重复设置了pageEncoding
如：一个Page下设置了两个pageEncoding：

<%@ page language="java" contentType="text/html; charset=UTF-8"
                pageEncoding="UTF-8" pageEncoding="UTF-8"%>

或者一个jsp文件加下设置了多个page，而page又存在pageEncoding

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" %>
         ...
         ...
         ...
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" %>