使用javaconfig配置freemarker 

 1 package com.yy.config;
 2 
 3 import org.springframework.context.annotation.Bean;
 4 import org.springframework.context.annotation.ComponentScan;
 5 import org.springframework.context.annotation.Configuration;
 6 import org.springframework.web.servlet.ViewResolver;
 7 import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
 8 import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 9 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
10 import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;
11 import org.springframework.web.servlet.view.freemarker.FreeMarkerView;
12 import org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver;
13 
14 import java.util.Properties;
15 
16 /**
17  * 配置上下文加载需要的bean
18  * 包含Web组件的bean,如控制器、视图解析器、处理器映射
19  * User : liuhuangyinying
20  * Date : 2017-03-21 15:48
21  */
22 @Configuration
23 @EnableWebMvc
24 @ComponentScan("com.yy") // 启动组件扫描
25 public class WebConfig extends WebMvcConfigurerAdapter{
26 
27     /**
28      * 配置静态文件处理
29      */
30     @Override
31     public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
32         configurer.enable("/WEB-INF/static/");
33     }
34 
35     /**
36      * 配置freemarker视图解析器
37      */
38     @Bean
39     public ViewResolver viewResolver(){
40         FreeMarkerViewResolver viewResolver = new FreeMarkerViewResolver();
41         viewResolver.setViewClass(FreeMarkerView.class);
42         viewResolver.setCache(false);
43         viewResolver.setPrefix("/WEB-INF/template/");
44         viewResolver.setSuffix(".ftl");
45         viewResolver.setContentType("text/html;charset=utf-8");
46         viewResolver.setExposeRequestAttributes(true);
47         viewResolver.setExposeSessionAttributes(true);
48         viewResolver.setExposeSpringMacroHelpers(true);
49         viewResolver.setRequestContextAttribute("rc");
50         return viewResolver;
51     }
52 
53     @Bean
54     public FreeMarkerConfigurer freeMarkerConfigurer(){
55         FreeMarkerConfigurer freeMarkerConfigurer = new FreeMarkerConfigurer();
56         freeMarkerConfigurer.setTemplateLoaderPath("/");
57         freeMarkerConfigurer.setDefaultEncoding("UTF-8");
58         Properties properties = new Properties();
59         properties.put("template_update_delay",10);
60         properties.put("defaultEncoding","UTF-8");
61         properties.put("url_escaping_charset","UTF-8");
62         properties.put("locale","zh_CN");
63         properties.put("boolean_format","true,false");
64         properties.put("time_format","HH:mm:ss");
65         properties.put("datetime_format","yyyy-MM-dd HH:mm:ss");
66         properties.put("date_format","yyyy-MM-dd");
67         properties.put("number_format","#,###.##");
68         properties.put("whitespace_stripping","true");
69         properties.put("classic_compatible","true");
70         freeMarkerConfigurer.setFreemarkerSettings(properties);
71         return freeMarkerConfigurer;
72     }
73 }
View Code

配置后启动项目，项目居然报错

 

居然是空指针错误，那么就只能设置断点调试，看看是否缺少配置什么属性。

跟踪到这一步的时候发现，这里抛出的异常，那么继续往下调试：

 

 

进入props.setProperty方法，会发现进入到java.util.Properties类报错：

什么鬼，只要不是String类型就设置为null，也就是说不支持int和boolean类型。

也就是说这里的value都必须加上双引号。不是经典的java包就是百分百可以信任的，遇到问题仍然要看源码才可以解决问题。

错误提示特别是空指针不一定是根源，断点真是个好东西。Love  Love Love

 

posted @ 2017-03-21 17:27  爱笑的狐狸  阅读(275)  评论(0)  编辑  收藏  举报