freemarker 生成 Java 代码

一、导入maven依赖 

       

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

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

package ${classPath};

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 dataMap = new HashMap();

            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。