1.通過能過濾器新增

public class ContextPathFilter implements Filter {
    @Override
public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) 

throws IOException, 
 
ServletException {

        String path = ((HttpServletRequest)servletRequest).getContextPath();
String basepath = path;
servletRequest.setAttribute("CP", basepath);
filterChain.doFilter(servletRequest, servletResponse);
}

    @Override
public void destroy() {

    }
}

<filter>
 
    <filter-name>ContextPathFilter</filter-name>
    <filter-class>com.person.core.web.ContextPathFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>ContextPathFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
 

<link rel="stylesheet" type="text/css" href="${CP}/css/style.css"/>

<script type="text/javascript">
var basePath = '${CP}';

</script>

1. 一.js  
2. a.'${pageContext.request.contextPath}'//結果:/projectName
3. b.'<%=request.getContextPath()%>'//結果:/projectName
4. 用法：  
5. <script>  
6. function searchData(dom){  
7.    $(dom).attr('disabled', true);  
8.    var url = '${pageContext.request.contextPath}/OrderController/getOrders.mmx?'+$('#orderForm').serialize();  
9.    var url = '<%=request.getContextPath()%>'+'/OrderController/getOrders.mmx?'+$('#orderForm').serialize();  
10.    $('#dataDiv').html('資料載入中...').load(url, function(){  
11.       $(dom).attr('disabled', false);  
12.    });  
13. }  
14. <script>  

1. 二.jsp  
2. a.<%=request.getContextPath()%>//結果:/projectName  
3. b.${pageContext.request.contextPath}//結果:/projectName  
4. 用法：  
5. <linkrel="stylesheet"type="text/css"href="${pageContext.request.contextPath}/order/css/OrderCss.css"/>
6. <linkrel="stylesheet"type="text/css"href=<%=request.getContextPath()%>+"/order/css/OrderCss.css" />