使用FreeMarker生成静态HTML

1、FreeMarker需要添加的Maven依赖：

 <dependency>
     <groupId>org.freemarker</groupId>
     <artifactId>freemarker</artifactId>
     <version>2.3.23</version>
 </dependency>

2、使用模板生成HTML代码

2.1 数据模型

 public class User {

     private String username;

     private String password;

     private Integer age;

     private String address;

     //省略setter和getter方法
 }

2.2 FreeMarker模板

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="UTF-8">
 <title>用户信息</title>
 <!-- 新 Bootstrap 核心 CSS 文件 -->
 <link rel="stylesheet"
     href="http://cdn.bootcss.com/bootstrap/3.3.0/css/bootstrap.min.css" />
 </head>
 <body style="font-family:'Courier New'">
     <h3 class="text-center">这是用户${username}的信息页！</h3>
     <div class="col-md-6 column">
         <table class="table table-bordered">
             <tr>
                 <th>用户名</th>
                 <th>密码</th>
                 <th>年龄</th>
                 <th>地址</th>
             </tr>
             <tr>
                 <td>${username}</td>
                 <td>${password}</td>
                 <td>${age}</td>
                 <td>${address}</td>
             </tr>
         </table>
     </div>
 </body>
 </html>

2.3 使用FreeMarker生成HTML代码

     /**
      * 使用模板生成HTML代码
      */
     public static void createHtmlFromModel() {
         FileWriter out = null;
         try {
             // 通过FreeMarker的Confuguration读取相应的模板文件
             Configuration configuration = new Configuration(Configuration.VERSION_2_3_23);
             // 设置模板路径
             configuration.setClassForTemplateLoading(CreateHtmlByFreemarker.class, "/static/ftl");
             // 设置默认字体
             configuration.setDefaultEncoding("utf-8");

             // 获取模板
             Template template = configuration.getTemplate("user.ftl");
             //设置模型
             User user = new User("tom", "hahahah", 28, "上海市");

             //设置输出文件
             File file = new File("e:/html/result.html");
             if(!file.exists()) {
                 file.createNewFile();
             }
             //设置输出流
             out = new FileWriter(file);
             //模板输出静态文件
             template.process(user, out);
         } catch (TemplateNotFoundException e) {
             e.printStackTrace();
         } catch (MalformedTemplateNameException e) {
             e.printStackTrace();
         } catch (ParseException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         } catch (TemplateException e) {
             e.printStackTrace();
         } finally {
             if(null != out) {
                 try {
                     out.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
     }

3、使用String作为FreeMarker模板，生成HTML代码

3.1 数据模型使用2.1模型

3.2 模板使用2.2模板

3.3 使用FreeMarker生成HTML代码

 /**
      * 把模板读入到String中，然后根据String构造FreeMarker模板
      */
     public static void createHtmlFromString() {
         BufferedInputStream in = null;
         FileWriter out = null;
         try {
             //模板文件
             File file = new File("D:/EclipseLearnSpace/ResearchSpace/Html2Pdf/src/main/resources/static/html/user.html");
             //构造输入流
             in = new BufferedInputStream(new FileInputStream(file));
             int len;
             byte[] bytes = new byte[1024];
             //模板内容
             StringBuilder content = new StringBuilder();
             while((len = in.read(bytes)) != -1) {
                 content.append(new String(bytes, 0, len, "utf-8"));
             }

             //构造Configuration
             Configuration configuration = new Configuration(Configuration.VERSION_2_3_23);
             //构造StringTemplateLoader
             StringTemplateLoader loader = new StringTemplateLoader();
             //添加String模板
             loader.putTemplate("test", content.toString());
             //把StringTemplateLoader添加到Configuration中
             configuration.setTemplateLoader(loader);

             //构造Model
             User user = new User("tom", "kkkkk", 29, "北京山东");
             //获取模板
             Template template = configuration.getTemplate("test");
             //构造输出路
             out = new FileWriter("e:/html/result.html");
             //生成HTML
             template.process(user, out);
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } catch (UnsupportedEncodingException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         } catch (TemplateException e) {
             e.printStackTrace();
         } finally {
             if(null != in) {
                 try {
                     in.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
             if(null != out) {
                 try {
                     out.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }

     }

4、使用String模板，模板中使用List

4.1 数据模型

 public class Classes {

     private String classId; // 班级ID

     private String className; // 班级名称

     private List<User> users;

     public String getClassId() {
         return classId;
     }

     //省略settter和getter方法

 }

4.2 FreeMarker模板

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="UTF-8">
 <title>班级信息</title>
 <!-- 新 Bootstrap 核心 CSS 文件 -->
 <link rel="stylesheet"
     href="http://cdn.bootcss.com/bootstrap/3.3.0/css/bootstrap.min.css" />
 <style type="text/css">
     .table-align{
         margin-left: 25%;
     }
 </style>
 </head>
 <body style="font-family:'Courier New'">

     <h3 class="text-center">下面是班级ID【${classId}】，班级名称【${className}】的人员信息</h3>
     <div class="col-md-6 column table-align">
         <table class="table">
             <tr>
                 <th>姓名</th>
                 <th>密码</th>
                 <th>年龄</th>
                 <th>地址</th>
             </tr>
             <!-- FreeMarker使用List循环 -->
             <#list users as user>
                 <tr>
                     <td>${user.username}</td>
                     <td>${user.password}</td>
                     <td>${user.age}</td>
                     <td>${user.address}</td>
                 </tr>
             </#list>
         </table>
     </div>
 </body>
 </html>

4.3 使用FreeMarker生成HTML代码

 /**
      * 根据String模板生成HTML，模板中存在List循环
      */
     public static void createHtmlFromStringList() {
         BufferedInputStream in = null;
         FileWriter out = null;
         try {
             //模板文件
             File file = new File("D:/EclipseLearnSpace/ResearchSpace/Html2Pdf/src/main/resources/static/html/class.html");
             //构造输入流
             in = new BufferedInputStream(new FileInputStream(file));
             int len;
             byte[] bytes = new byte[1024];
             //模板内容
             StringBuilder content = new StringBuilder();
             while((len = in.read(bytes)) != -1) {
                 content.append(new String(bytes, 0, len, "utf-8"));
             }

             //构造Configuration
             Configuration configuration = new Configuration(Configuration.VERSION_2_3_23);
             //构造StringTemplateLoader
             StringTemplateLoader loader = new StringTemplateLoader();
             //添加String模板
             loader.putTemplate("test", content.toString());
             //把StringTemplateLoader添加到Configuration中
             configuration.setTemplateLoader(loader);

             //构造Model
             Classes classes = new Classes();
             classes.setClassId("23");
             classes.setClassName("实验一班");
             List<User> users = new ArrayList<User>();
             User user = new User("tom", "kkkkk", 29, "北京");
             users.add(user);
             User user2 = new User("Jim", "hhhh", 22, "上海");
             users.add(user2);
             User user3 = new User("Jerry", "aaaa", 25, "南京");
             users.add(user3);
             classes.setUsers(users);
             //获取模板
             Template template = configuration.getTemplate("test");
             //构造输出路
             out = new FileWriter("e:/html/result.html");
             //生成HTML
             template.process(classes, out);
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } catch (UnsupportedEncodingException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         } catch (TemplateException e) {
             e.printStackTrace();
         } finally {
             if(null != in) {
                 try {
                     in.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
             if(null != out) {
                 try {
                     out.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }

     }