分享程序员开发的那些事...
更新时间：2022-06-17 04:50:22
更好的解决方案可能是使用另一个模板引擎，如freemarker或velocity，它们独立于servlet api，更适合基于文本的电子邮件。
A better solution might be to use another template engine like freemarker or velocity, which are independent of the servlet api and more suited for text-based emails.
但是，这可以通过包装 HttpServletResponse 并覆盖 getWriter $ c来实现。 $ c>方法。以下代码适用于glassfish。
However, this is possible by wrapping the HttpServletResponse and overriding getWriter methods. The code below works for me on glassfish.
Servlet：
public class TestServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HttpServletResponseWrapper responseWrapper = new HttpServletResponseWrapper(response) {
private final StringWriter sw = new StringWriter();
@Override
public PrintWriter getWriter() throws IOException {
return new PrintWriter(sw);
}
@Override
public String toString() {
return sw.toString();
}
};
request.getRequestDispatcher("test.jsp").include(request, responseWrapper);
String content = responseWrapper.toString();
System.out.println("Output : " + content);
response.getWriter().write(content);
}
}
JSP：
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Hello world</title>
</head>
<body>
<h1><%= "Hello world from a JSP!" %></h1>
</body>
</html>