java 将jsp响应作为servlet内的字符串获取
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/13721238/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
get jsp response as a string inside servlet
提问by Marko Vranjkovic
Is there a way to get response from a jsp file as a String inside servlet. Something like
有没有办法从jsp文件中作为servlet内的字符串获取响应。就像是
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String section1 = getResponseFromJSP();
// do something else ...
sendMailToUser(section1);
}
I'm using Servlet API 2.4 and java 1.4
我正在使用 Servlet API 2.4 和 java 1.4
回答by J?rn Horstmann
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.
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。
However, this is possible by wrapping the HttpServletResponseand overriding getWritermethods. The code below works for me on glassfish.
但是，这可以通过包装HttpServletResponse和 覆盖getWriter方法来实现。下面的代码在 glassfish 上对我有用。
Servlet:
服务端：
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:
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>
