eclipse 网页上的新行 - Java servlet
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New Line on a web page- Java servlet
提问by Nik_stack
I am new to learning Java Servlet. I am trying to pass parameters through POST query(Apache Tomcat v8.0) using a simple html form that generates two input fields 'UserName' and 'FullName'. The code is running perfectly however; I want 'UserName' and 'FullName' to display on separate new line and I cannot do it by using "/n" inside println() function. Here is my POST query code.
我是学习 Java Servlet 的新手。我正在尝试使用生成两个输入字段“用户名”和“全名”的简单 html 表单通过 POST 查询（Apache Tomcat v8.0）传递参数。然而，代码运行良好；我希望 'UserName' 和 'FullName' 显示在单独的新行上，我不能通过在 println() 函数中使用“/n”来实现。这是我的 POST 查询代码。
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html");
PrintWriter out= response.getWriter();
String User_name = request.getParameter("UserName");
String Full_name = request.getParameter("FullName");
out.println("\nHello from POST method!");
out.println("\nYour UserName is: " +User_name);
out.println("\nYour FullName is: " +Full_name);
}
回答by developerwjk
\nis newline for text. View source in browser, and you'll see the \nis giving you a newline in the HTML source. The problem is, browsers don't display that \nas a newline in the rendered HTML. That's because to make a newline in HTML you use either <br />for linebreak, or wrap your line into a paragraph beginning with <p>and ending with </p>. If you're going to be doing JSP/Servlet development, you need to learn the basics of HTML.
\n是文本的换行符。在浏览器中查看源代码，您将看到\n在 HTML 源代码中为您提供了一个换行符。问题是，浏览器不会\n在呈现的 HTML 中将其显示为换行符。那是因为要在 HTML 中创建换行符，您可以使用<br />换行符，或者将您的行换行到以 开头<p>和结尾的段落中</p>。如果您打算进行 JSP/Servlet 开发，则需要学习 HTML 的基础知识。
So:
所以：
out.println("<p>Hello from POST method!</p>");
out.println("<p>Your UserName is: " + User_name + "</p>");
or
或者
out.println("Hello from POST method!");
out.println("<br />Your UserName is: " + User_name);
Its also not recommended to print HTML directly in a servlet like this. You should rather set a request attribute and forward to a JSP that acts as a view. This is explained well in the Servlets info page.
也不建议像这样直接在 servlet 中打印 HTML。您应该设置请求属性并转发到充当视图的 JSP。这在Servlets 信息页面中有很好的解释。
Just a hint for the future: After a post which has changed something on the server (saved to db or whatever) you will want to do a server-side redirect to prevent double posting.
只是对未来的一个提示：在更改服务器上的某些内容（保存到 db 或其他任何内容）的帖子之后，您将需要进行服务器端重定向以防止重复发布。
