需求驱动：
- 测试数据生成
- 项目中有单据打印可以通过动态替换参数生成pdf，然后传给打印机去打印，可以通过freeMarker来实现这种需求
FreeMarker实现图
1、下载FreeMarker
官网下载：
https://freemarker.apache.org/freemarkerdownload.html
或者用maven添加依赖形式下载
<dependency> <groupId>org.freemarker</groupId> <artifactId>freemarker-gae</artifactId> <version>2.3.30</version> </dependency>
2、新建一个项目来完成FreeMarkerDemo
2、1把依赖加入工程项目中
3、创建模板文件
demo01.ftl
<html>
<head>
<title>Welcome!</title>
</head>
<body>
<table>
<caption>${caption}</caption>
《tr》
<li>姓名：</li>
<li>爱好：</li>
<li>性别：</li>
<li>地址：</li>
</tr>
<!list users in user>
《tr》
<li>${user.name}</li>
<li>${user.hobby}</li>
<li>${user.male}</li>
<li>${user.address}</li>
</tr>
<#list>
</table>
</body>
</html>
4、写java代码去替换模板中的可替换参数
package cn.student.freeMarker; import java.io.File; import java.io.FileWriter; import java.io.IOException;import java.io.Writer; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import freemarker.core.ParseException; import freemarker.template.Configuration; import freemarker.template.MalformedTemplateNameException; import freemarker.template.Template; import freemarker.template.TemplateException; import freemarker.template.TemplateExceptionHandler; import freemarker.template.TemplateNotFoundException; public class FreeMarkerTest { public static void main(String[] args) throws TemplateNotFoundException, MalformedTemplateNameException, ParseException, IOException, TemplateException { //创建配置对象 Configuration cfg = new Configuration(Configuration.VERSION_2_3_28); //设置读取模板路径 cfg.setDirectoryForTemplateLoading(new File("./")); //设置编码集 cfg.setDefaultEncoding("UTF-8"); //异常处理 cfg.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER); cfg.setLogTemplateExceptions(false); cfg.setWrapUncheckedExceptions(true); //准备数据 Map root = new HashMap(); root.put("caption", "个人兴趣爱好统计"); List<Student> studentList = new ArrayList<>(); Student student1 = new Student("张三","篮球","男","xxxx"); studentList.add(student1); Student student2 = new Student("李四","足球","男","xxxx"); studentList.add(student2); Student student3 = new Student("小丽","读书","女","xxxx"); studentList.add(student3); Student student4 = new Student("王五","篮球","男","xxxx"); studentList.add(student4); root.put("students", studentList); //获得模板 Template temp = cfg.getTemplate("demo01.ftl"); //产生输出流 Writer out = new FileWriter("demo.html"); temp.process(root, out); out.flush(); out.close(); } }
实体类：Student
package cn.student.freeMarker; public class Student { private String name; private String hobby; private String male; private String address; public Student(){ } public Student(String name, String hobby, String male, String address) { super(); this.name = name; this.hobby = hobby; this.male = male; this.address = address; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getHobby() { return hobby; } public void setHobby(String hobby) { this.hobby = hobby; } public String getMale() { return male; } public void setMale(String male) { this.male = male; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } }
5、最后生成的文件
<html>
<head>
<title>Welcome!</title>
</head>
<body>
<table>
<caption>个人兴趣爱好统计</caption>
<tr>
<li>姓名：</li>
<li>爱好：</li>
<li>性别：</li>
<li>地址：</li>
</tr>
<tr>
<li>张三</li>
<li>篮球</li>
<li>男</li>
<li>xxxx</li>
</tr>
<tr>
<li>李四</li>
<li>足球</li>
<li>男</li>
<li>xxxx</li>
</tr>
<tr>
<li>小丽</li>
<li>读书</li>
<li>女</li>
<li>xxxx</li>
</tr>
<tr>
<li>王五</li>
<li>篮球</li>
<li>男</li>
<li>xxxx</li>
</tr>
</table>
</body>
</html>