velocity demo 解決中文顯示問題
阿新 • • 發佈：2019-02-08
專案結構如截圖所示：
1、首先，匯入velocity程式設計所需的jar包，建好各類檔案。所需jar包所下：
2、配置web.xml檔案
<!-- 配置velocity的servlet --> <servlet> <servlet-name>velocity</servlet-name> <servlet-class>org.apache.velocity.tools.view.VelocityViewServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>velocity</servlet-name> <url-pattern>*.vm</url-pattern> </servlet-mapping> <servlet> <servlet-name>hello</servlet-name> <servlet-class>velocityHandler.HelloHandler</servlet-class> </servlet> <servlet-mapping> <servlet-name>hello</servlet-name> <url-pattern>/index</url-pattern> <!-- 供瀏覽器訪問 --> </servlet-mapping>
HelloHandler.java具體程式碼如下：
index.vm檔案public class HelloHandler extends VelocityViewServlet{ private static final long serialVersionUID = 1L; private VelocityEngine velo; @Override public void init() throws ServletException{ //velocity引擎物件 velo = new VelocityEngine(); //設定vm模板的裝載路徑 Properties prop = new Properties(); String path = this.getServletContext().getRealPath("/"); prop.setProperty(Velocity.FILE_RESOURCE_LOADER_PATH, path + "templates/"); //設定編碼 prop.setProperty(Velocity.ENCODING_DEFAULT, "UTF-8"); prop.setProperty(Velocity.INPUT_ENCODING, "UTF-8"); prop.setProperty(Velocity.OUTPUT_ENCODING, "UTF-8"); try { //初始化設定，下面用到getTemplate("*.vm")輸出時一定要呼叫velo物件去做,即velo.getTemplate("*.vm") velo.init(prop); } catch (Exception e1) { e1.printStackTrace(); } } @SuppressWarnings("unchecked") @Override protected Template handleRequest(HttpServletRequest request, HttpServletResponse response, Context ctx) { try { request.setCharacterEncoding("UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } response.setCharacterEncoding("UTF-8"); String p1 = "lily"; String p2 = "molly"; String p3 = "張三瘋"; @SuppressWarnings("rawtypes") Vector personList = new Vector(); personList.addElement(p1); personList.addElement(p2); personList.addElement(p3); ctx.put("personList", personList); //將模板資料 list放置到上下文環境context中 Template template = velo.getTemplate("index.vm"); return template; } }
3、在瀏覽器中輸入地址http://localhost/velocity/index，即可看到如下效果<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Sample velocity page</title> </head> <body bgcolor="#ffffff"> <center> <h2>Hello Velocity</h2> <table width="100" cellpadding="5" cellspacing="1" bordercolor="#333333"> <tr><td bgcolor="#eeeeee" align="center">Names</td></tr> #foreach ($name in $personList) <tr><td bgcolor="#6666FF" align="center">$name</td></tr> #end </table> </center> </body> </html>
注意：vm檔案不可以直接被訪問，即在瀏覽器中直接輸入地址http://localhost/velocity/templates/index.vm不會看到效果，vm檔案需經過某個機制才能被解析，如struts2，spring等等。