servlet 中的 printWriter() 对象究竟做了什么？

Question

public class myServlet extends httpservlet 
{
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException 
    {
        PrintWriter out = response.getWriter();
        out.println(--------"HTML CODE"------);
    }
}

I'm new to servlets and web programming. While practicing, I'm stuck at some general doubt. What exactly does the PrintWriter() object do in a servlet? Just directing the HTML code to output stream?

Answer 1

In Java, to handle I/O operations , there are different I/O classes like Reader , Writer , InputStream , OutputStream classes etc. In Servlet , when you want to do output operation ie, writing HTML content in web page, you need one of these classes. More info on these classes, you can get from this link.

So we create PrintWriter instance from the response and invoke its write () method to write simple HTML contents.

Answer 2

HttpServletResponse 的 getWriter() 方法返回一个 PrintWriter 对象，该对象可用于向客户端发送文本，是的，它可用于向客户端发送 html 代码。