How to insert a line break in HTML using JSP?

You can use the <br> tag.

<%
// Output text with line break
out.println("First line.<br>");
out.println("Second line.");
%>

Another way is to use CSS to control text display.

<p style="white-space: pre-line;">
This line will be broken.<br>
And this one will not, because <br> inside pre-line preserves line breaks.
</p>

You can also use Java code inside JSP to generate a string with a line break character (\n), and then display it so that the browser interprets \n as a line break (e.g., inside <pre> or with CSS white-space: pre-wrap;).

<%
String text = "First line.\nSecond line.";
%>

<pre>
<%= text %>
</pre>

<p style="white-space: pre-wrap;">
<%= text %>
</p>

Main approaches summarized in a table:

Method	Description	HTML/CSS	JSP/Java	Notes
<br>	Inserts explicit line break	Yes	Yes	Simple and common
CSS white-space: pre-line;	Preserves line breaks in source	Yes	Yes	Good for formatted text
CSS white-space: pre-wrap;	Preserves line breaks and spaces	Yes	Yes	Suitable for preformatted text
<pre>	Displays text in monospace with preserved whitespace	Yes	Yes	Semantically for preformatted text