Servlet和JSP的通訊

js|servlet 以下的程式碼片段示範了一個servlet，它例示(instantiates)一個bean並且用由瀏覽器發送的Form資料將它初始化。此後bean被加入request,而這一要求被送到JSP頁面（Bean1.jsp）,JSP通過request取得並做進一步處理。

public void doPost (HttpServletRequest request,
HttpServletResponse response) {

try {
govi.FormBean f = new govi.FormBean();
String id = request.getParameter("id");
f.setName(request.getParameter("name"));
f.setAddr(request.getParameter("addr"));
f.setAge(request.getParameter("age"));
//use the id to compute
//additional bean properties like info
//maybe perform a db query, etc.
// . . .
f.setPersonalizationInfo(info);
request.setAttribute("fBean",f);
getServletConfig().getServletContext().getRequestDispatcher
("/jsp/Bean1.jsp").forward(request, response);
} catch (Exception ex) {
. . .
}
}

在將它從通過useBean操作中的預設的請求範圍，即scope首次執行後，即可在JSP檔案的Bean1.jsp處理fBean。

<jsp:useBean id="fBean" class="govi.FormBean" scope="request"/>
<jsp:getProperty name="fBean" property="name" />
<jsp:getProperty name="fBean" property="addr" />
<jsp:getProperty name="fBean" property="age" />
<jsp:getProperty name="fBean" property="personalizationInfo" />