freemark工具类简单使用

            <dependency>
                <groupId>org.freemarker</groupId>
                <artifactId>freemarker</artifactId>
                <version>${freemarker.version}</version>
            </dependency>

package com.common.base.utils;

import java.io.*;
import java.util.Locale;
import java.util.Map;
import freemarker.template.Configuration;
import freemarker.template.Template;


/**
 * @Auther: tony_t_peng
 * @Date: 2020-12-08 11:25
 * @Description: 
 */
public class FreeMarkerUtil {

    /**
     **   @param fileName 要读取的文件名，包括文件后缀名
     * 	 * @param item 传入的map
     * 	 * @param filePath 要读取的文件路径
     */
    public static String generateString(String fileName, String templatePath, Map<String, Object> data) throws IOException {
        StringWriter out = new StringWriter();
        process(fileName,templatePath,data,out);
        return out.getBuffer().toString();
    }

    public static void generateFile(String fileName, String templatePath, Map<String, Object> data,File outFile) throws IOException {
        Writer out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(outFile), "utf-8"));
        process(fileName,templatePath,data,out);
    }



    private static void  process(String fileName, String templatePath,Map<String, Object> data, Writer out) throws IOException {
        try {
            // 通过Template可以将模板文件输出到相应的流
            Template template = getTemplate(fileName, templatePath);
            template.process(data, out);
            out.flush();
        } catch (Exception e){
            e.printStackTrace();
        }finally {
            if(out!=null){
                out.close();
            }
        }
    }



    private static Template getTemplate(String fileName, String templatePath){
        try {
            // 通过Freemaker的Configuration读取相应的ftl
            Configuration cfg = new Configuration();
            cfg.setEncoding(Locale.CHINA, "utf-8");
            // 设定去哪里读取相应的ftl模板文件
            cfg.setDirectoryForTemplateLoading(new File(templatePath));
            // 在模板文件目录中找到名称为name的文件
            Template temp = cfg.getTemplate(fileName);
            return temp;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

 String IDPS_TEMPLATE_NAME="CN.D.MANULIFE.TEMPLATE.ftl";  //模板文件名

 String filePath = getClass().getResource("/tempalte/freemark/").getPath(); //模板文件夹地址

 File file = new File(OUT_FILE_PATH+"CN.D.MANULIFE.DBSCOVR.txt"); //输出文件对象

 FreeMarkerUtil.generateFile(IDPS_TEMPLATE_NAME,filePath,buildCoverageData(asOfDt),file);//buildCoverageData封装要给map，用以存放对象

${header!""}
<#list items as item>
　　${item.field1!""}${item.field2!""}
</#list>
${trailer!""}