3

有没有办法从 jsp 文件中获取响应作为 servlet 中的字符串。就像是

protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     String section1 = getResponseFromJSP();
     // do something else ...
     sendMailToUser(section1);
}

我正在使用 Servlet API 2.4 和 java 1.4

4

1 回答 1

20

更好的解决方案可能是使用另一个模板引擎，例如 freemarker 或 velocity，它们独立于 servlet api，更适合基于文本的电子邮件。

但是，这可以通过包装HttpServletResponse和覆盖getWriter方法来实现。下面的代码适用于 glassfish。

小服务程序：

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>
于 2012-12-05T11:06:03.847 回答