How to jump from one page to another in Java

For example:

Click the New button to jump to the role adding page and

use the following code to complete

<button type="button" class="btn btn-default" title=
"新建" onclick="location.href='${pageContext.request.contextPath}/pages/role-add.jsp'">
<i class="fa fa-file-o"></i> 新建
</button>

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