public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
res.setContentType("text/html");
PrintWriter out = res.getWriter();
out.println("
out.println("SimpleServlet Output");
out.println("
This is output is from SimpleServlet.");
out.println("");
out.close();
}
public String getServletInfo() {
return "A simple servlet";
}
}
在这里用res.getWriter();得到的PrintWriter有什么用呢？用到了他的什么？代码中的out.println根本就没有用到啊？他如果我直接PrintWriter out = new PrintWriter();结果有什么不同？