Maven 整合FreeMarker使用

kangxu 2021-08-03 原文

pom.xml

1 <!-- freemarker jar -->
2 <dependency>
3     <groupId>org.freemarker</groupId>
4     <artifactId>freemarker</artifactId>
5     <version>2.3.20</version>
6 </dependency>

testFreeMarker.flt

1 您好${name}，现在在测试FreeMarker功能

FreeMarkerUtil.java

 1 package pers.kangxu.test.util;
 2 
 3 import java.io.IOException;
 4 import java.io.StringWriter;
 5 import java.util.Map;
 6 
 7 import javax.servlet.http.HttpServletRequest;
 8 
 9 import freemarker.template.Configuration;
10 import freemarker.template.Template;
11 import freemarker.template.TemplateException;
12 
13 /**
14  * 
15  * <b>
16  *    FreeMarkerUtil
17  * </b>
18  * @author kangxu
19  *
20  */
21 public class FreeMarkerUtil {
22     
23     private static FreeMarkerUtil instance;
24     private Configuration config;
25     
26     String templatePath = "/freeMarker/";
27     
28     /**
29      * instance FreeMarkerUtil
30      * @return
31      */
32     public static FreeMarkerUtil instance() {
33         if (instance == null) {
34             instance = new FreeMarkerUtil();
35         }
36         return instance;
37     }
38     
39     /**
40      * instance Configuration
41      * @param request
42      */
43     private void configInstance(HttpServletRequest request) {
44         if (this.config == null) {
45             this.config = new Configuration();
46             this.config.setServletContextForTemplateLoading(request.getSession().getServletContext(),templatePath);
47         }
48     }
49     
50     /**
51      * 通过模板文件生成字符串
52      * @param request
53      * @param templateFileName
54      * @param propMap
55      * @return
56      */
57     public String geneFileStr(HttpServletRequest request,String templateFileName, Map<String, Object> propMap) {
58         configInstance(request);
59         StringWriter out = new StringWriter();
60         Template tmp;
61         try {
62             tmp = this.config.getTemplate(templateFileName,"UTF-8");
63             tmp.setEncoding("UTF-8");
64             tmp.process(propMap, out);
65         } catch (IOException e) {
66             e.printStackTrace();
67         } catch (TemplateException e) {
68             e.printStackTrace();
69         }
70         return out.getBuffer().toString();
71     }
72 
73 }

TestController.java

 1 package pers.kangxu.test.controller;
 2 
 3 import java.util.HashMap;
 4 import java.util.Map;
 5 
 6 import javax.servlet.http.HttpServletRequest;
 7 
 8 import org.springframework.stereotype.Controller;
 9 import org.springframework.web.bind.annotation.RequestMapping;
10 import org.springframework.web.bind.annotation.ResponseBody;
11 
12 import pers.kangxu.test.util.FreeMarkerUtil;
13 
14 
15 @Controller
16 @RequestMapping("/test-default")
17 public class TestController {
18     
19     @RequestMapping(value="test-freemarker",produces = "application/json; charset=utf-8")
20     @ResponseBody
21     public String testFreeMarker(HttpServletRequest request){
22         
23         Map<String,Object> map = new HashMap<String,Object>();
24         map.put("name", "【我是名字】");
25         
26         return FreeMarkerUtil.instance().geneFileStr(request, "testFreeMarker.flt", map);
27     }
28 }