在Java字符串中獲取Textarea換行符

Question

我有以下表格：

<form method="post" action="./Contact">
    <input type="text" name="Problem"><br>
    <textarea name="message"></textarea>
    <input type="submit" value="Send Problem">
</form>

進入聯系Servlet代碼：

protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        String b = request.getParameter("Problem");
        String a = request.getParameter("message");
        request.setAttribute("message", a);
        request.setAttribute("problem", b);
        request.getRequestDispatcher("./index.jsp").forward(request, response);
    }

只是測試消息，將其轉換為index.jsp代碼：

<p> Problem: ${problem}</p>
<p> Message: ${message}</p>

它正在運行，但是如果書面消息為：“這是一條消息；

這是一條新的訊息。

我在打破界限。”

打印的消息將是：“這是一條消息；這是一條新的消息行，我正在換行。”

如何使用字符串從textarea消息中獲得書面的換行符？

Answer 1

這樣使用StringBuffer ，

 protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    request.setCharacterEncoding("UTF-8");
    String b = request.getParameter("Problem");
   // String a = request.getParameter("message");

    StringBuffer text = new StringBuffer(request.getParameter("message"));

    int loc = (new String(text)).indexOf('\n');
    while(loc > 0){
        text.replace(loc, loc+1, "<BR>");
        loc = (new String(text)).indexOf('\n');
   }

    request.setAttribute("message", text);
    request.setAttribute("problem", b);
    request.getRequestDispatcher("./index.jsp").forward(request, response);
}