錯誤:配置web.xml時,出現紅色叉叉,提示java
The content of element type "web-app" must match "(icon?,display-
name?,description?,distributable?,context-param*,filter*,filter-mapping*,listener*,servlet*,servlet-
mapping*,session-config?,mime-mapping*,welcome-file-list?,error-page*,taglib*,resource-env-
ref*,resource-ref*,security-constraint*,login-config?,security-role*,env-entry*,ejb-ref*,ejb-local-ref*)".
- No grammar constraints (DTD or XML schema) detected for the document.web
緣由大概就是:web.xml中標籤順序不符合web-app_2_3.dtd規範session
web.xml頭部配置:app
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>xml
緣由:文檔內容標籤順序不符合web-app_2_3.dtd規範ip
解決方案element
1:嚴格按照提示上的順序排列文檔
2:刪除<!DOCTYPE 。。。。這段內容,即<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">刪除這行get