将jsp响应作为servlet中的字符串获取 [英] get jsp response as a string inside servlet
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问题描述
有没有办法从jsp文件中获取响应作为servlet内的String。类似
Is there a way to get response from a jsp file as a String inside servlet. Something like
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
I'm using Servlet API 2.4 and java 1.4
推荐答案
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 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>
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