模板式生成 JSP页面步骤

来源：互联网发布：阿里大数据平台编辑：程序博客网时间：2024/06/08 08:53

一。准备工作

1.项目中必须有 spring-webmvc-3.2.2.RELEASE.jar 架包。因为等会会用到里面的 FreeMarkerConfigurer 类。

2.需要在 spring-mvc.xml 文件中配置如下信息：

<bean id="freemarkerConfig"
  class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
  <property name="templateLoaderPath" value="/WEB-INF/" />
  <property name="freemarkerSettings">
   <props>
    <prop key="template_update_delay">0</prop>
    <prop key="defaultEncoding">UTF-8</prop>
    <prop key="url_escaping_charset">UTF-8</prop>
    <prop key="locale">zh_CN</prop>
    <prop key="boolean_format">true,false</prop>
    <prop key="datetime_format">yyyy-MM-dd HH:mm:ss</prop>
    <prop key="date_format">yyyy-MM-dd</prop>
    <prop key="time_format">HH:mm:ss</prop>
    <prop key="number_format">0.######</prop>
    <prop key="whitespace_stripping">true</prop>
   </props>
  </property>
</bean>

3.创建html模板。

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title>个人信息</title>

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="this is my page">
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">

</head>

<body>
     <div>
     姓名：${name}
     </div>
     <div>
     昵称：${nickname}
     </div>
      <div>
     地区：${area}
     </div>
      <div>
     性别：${sex}
     </div>
     <div>
     年龄：${age}
     </div>
</body>
</html>

二。代码编写

1.设置响应的格式

response.setCharacterEncoding("utf-8");
response.setContentType("text/html; charset=utf-8");

2.获取PrintWriter流，（用来在客户端输出）

PrintWriter writer = null;

writer = response.getWriter();

3.创建一个模板对象

Template tpl2 = null;

4.创建一个 StringWriter 类，代表一个字符流，可以用其回收在字符串缓冲区中的输出，来构造字符串。
StringWriter out = null;

5.运用freemarkerConfig 类制定模板路径生成模板，并赋值给模板对象 Template tpl2

Configuration config = freemarkerConfig.getConfiguration();

此处需要在上方导入在spring-mvc.xml 中配置好的类。

@Autowired
protected FreeMarkerConfigurer freemarkerConfig;

tpl2 = config.getTemplate("/tpl/MyHtml.html");

6.创建Map 用来放入模板中需要的值，此处自己按需求灵活处理。

Map<String, Object> map = new HashMap<String, Object>();
   map.put("name", "***");
   map.put("nickname", "Hunter");
   map.put("area", "上海");
   map.put("sex", "男");
   map.put("age", 25);
   Map<String, Object> rootMap = new HashMap<String, Object>();
   rootMap.putAll(map);

7.新建StringWriter类，代表一个字符流，可以用其回收再字符串缓冲区中的输出，来构造字符串。

out = new StringWriter();

8.将数据模型和模板合并。

tpl2.process(rootMap, out);

9.往页面返回构建的模板字符串

writer.write(out.toString());

此致就能在页面灵活输出你想要的页面了。

简易代码如下：

package cn.com.hunter.controller;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;

import freemarker.template.Configuration;
import freemarker.template.Template;

@Controller
@RequestMapping(value="/Template")
public class TemplateController {

@Autowired
protected FreeMarkerConfigurer freemarkerConfig;

@RequestMapping(value="/Template.action")
public void TemplateWtite(HttpServletRequest request,HttpServletResponse response){
  PrintWriter writer = null;
  try {
   response.setCharacterEncoding("utf-8");
   response.setContentType("text/html; charset=utf-8");
   writer = response.getWriter();
   Template tpl2 = null;
   StringWriter out = null;
   Configuration config = freemarkerConfig.getConfiguration();
   Map<String, Object> map = new HashMap<String, Object>();
   map.put("name", "红涛");
   map.put("nickname", "Hunter");
   map.put("area", "上海");
   map.put("sex", "男");
   map.put("age", 25);
   Map<String, Object> rootMap = new HashMap<String, Object>();
   rootMap.putAll(map);
   out = new StringWriter();
   tpl2 = config.getTemplate("/tpl/MyHtml.html");
   tpl2.process(rootMap, out);

   writer.write(out.toString());
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } finally {
   if (writer != null)
    writer.close();
  }
}

}

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