一、导入maven依赖 

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>cn.test</groupId>
  <artifactId>freemarket</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
 
  <dependencies>
           <dependency>
             <groupId>org.freemarker</groupId>
             <artifactId>freemarker</artifactId>
             <version>2.3.23</version>
         </dependency>
        
 
    </dependencies>
    <build>
 
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.0.2</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
 
            <!-- <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.4</version>
                <configuration>
                    <warSourceDirectory>src/main/webapp</warSourceDirectory>
                </configuration>
            </plugin> -->
 
        </plugins>
        <finalName>${project.artifactId}</finalName>
    </build>
</project>

二、新建com.freemarker.hello.templates包，并在该包下编写模板文件test.ftl

package ${classPath};
 
//java项目www.fhadmin.org
public class ${className} {
   private Integer ${Id};
   private String ${userName};
   private String ${password};
    
    public Integer get${Id}(){
        return ${Id};
    }
    
    public void set${Id}(Integer ${Id}){
        this.${Id}=${Id};
    }
    
    public String get${userName}(){
        return ${userName};
    }
 
    public void set${userName}(String ${userName}){
        this.${userName}=${userName};
    }
    
    public String get${password}(){
        return ${password};
    }
    
    public void set${password}(String ${password}){
        this.${password}=${password};
    }
}

三、编写运行生成对应Java代码类

package com.freemark.hello;
 
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.HashMap;
import java.util.Map;
 
import freemarker.template.Configuration;
import freemarker.template.Template;
 
//java项目www.fhadmin.org
public class FreemarkerDemo {
    
    private static final String TEMPLATE_PATH = "src/main/java/com/freemark/hello/templates";
    private static final String CLASS_PATH = "src/main/java/com/freemark/hello";
    
    public static void main(String[] args) {
        // step1 创建freeMarker配置实例
        Configuration configuration = new Configuration();
        Writer out = null;
        try {
            // step2 获取模版路径
            configuration.setDirectoryForTemplateLoading(new File(TEMPLATE_PATH));
            // step3 创建数据模型
            Map<String, Object> dataMap = new HashMap<String, Object>();
            dataMap.put("classPath", "com.freemark.hello");
            dataMap.put("className", "User");
            dataMap.put("Id", "Id");
            dataMap.put("userName", "userName");
            dataMap.put("password","password");
            // step4 加载模版文件
            Template template = configuration.getTemplate("test.ftl");
            // step5 生成数据
            File docFile = new File(CLASS_PATH + "\\" + "User.java");
            out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(docFile)));
            // step6 输出文件
            template.process(dataMap, out);
            System.out.println("^^^^^^^^^^^^^^^^^^^^^^^^User.java 文件创建成功 !");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (null != out) {
                    out.flush();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
    }
 
}

四、步骤三成功，刷新(refresh)项目即可，看到com.freemark.hello有一个User类。