java用freemarker实现导出excel

  1 package org.lq.ssm.gp.controller;
  2 
  3 import java.io.BufferedWriter;
  4 import java.io.File;
  5 import java.io.FileOutputStream;
  6 import java.io.IOException;
  7 import java.io.OutputStreamWriter;
  8 import java.io.Writer;
  9 import java.util.ArrayList;
 10 import java.util.HashMap;
 11 import java.util.List;
 12 import java.util.Map;
 13 
 14 import org.lq.ssm.entity.LandUser;
 15 import org.springframework.web.bind.annotation.RequestMapping;
 16 
 17 import freemarker.template.Configuration;
 18 import freemarker.template.Template;
 19 import freemarker.template.TemplateException;
 20 import freemarker.template.TemplateExceptionHandler;
 21 
 22 public class exportExcel {
 23     
 24     private Configuration configuration = null;
 25     
 26     public exportExcel(){
 27          configuration = new Configuration();
 28          configuration.setDefaultEncoding("utf-8");
 29     }
 30     //@RequestMapping(params="print")
 31     public void print() throws IOException {
 32          
 33          configuration = new Configuration();
 34          configuration.setDefaultEncoding("utf-8");
 35          // 要填入模本的数据文件
 36         Map dataMap = new HashMap();
 37         //getData(dataMap);
 38         
 39         List<Map<String, Object>>list=new ArrayList<Map<String,Object>>();
 40         for(int i=0;i<10;i++){
 41             Map<String, Object>map=new HashMap<String, Object>();
 42             map.put("userName", "张三");
 43             map.put("landName", "张三");
 44             map.put("landScmj", "111111");
 45             map.put("landBzdate", "20170626");
 46             list.add(map);
 47         }
 48         dataMap.put("list", list);
 49         
 50         // 设置模本装置方法和路径,FreeMarker支持多种模板装载方法。可以重servlet，classpath，数据库装载，  
 51           // 这里我们的模板
 52         //configuration.setDirectoryForTemplateLoading(new File("G:\\"));  
 53         
 54         
 55         configuration.setClassForTemplateLoading(this.getClass(), "/org/lq/ssm/gp/controller");
 56          //设置异常处理器
 57         configuration.setTemplateExceptionHandler(TemplateExceptionHandler.IGNORE_HANDLER);
 58         Template t = null;
 59         try {
 60              // test.ftl为要装载的模板 
 61             t = configuration.getTemplate("land.ftl");
 62             t.setEncoding("utf-8");
 63 
 64         } catch (IOException e) {
 65             e.printStackTrace();
 66         }
 67         // 输出文档路径及名称
 68         File outFile = new File("G:/TTT/land.xls");
 69         Writer out = null;
 70         
 71         try {
 72             out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(outFile), "utf-8"));
 73         } catch (Exception e1) {
 74             e1.printStackTrace();
 75         }
 76 
 77         try {
 78             t.process(dataMap, out);
 79             out.close();
 80         } catch (TemplateException e) {
 81             e.printStackTrace();
 82         } catch (IOException e) {
 83             e.printStackTrace();
 84         }
 85     }
 86     
 87     
 88     
 89     /**
 90      * 注意dataMap里存放的数据Key值要与模板中的参数相对应 
 91      * @param dataMap
 92      * @throws IOException 
 93      * 
 94      */
 95 
 96     public static void main(String[] args) throws IOException {
 97         
 98         exportExcel exc=new exportExcel();
 99         exc.print();
100     }
101 
102 }