springboot整合freemarker + 自定义方法输出json格式 教程篇

操作环境：dubbo + zookeeper + springboot
参考文章：https://blog.csdn.net/hzau_itdog/article/details/89400804

1. 引入freemarker pom

<dependency>
      <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>

2. 配置webMvc 配置静态资源路径

package com.skindow.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

/**
 * Created by Administrator on 2019/9/3.
 */
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
    /**
     * Override this method to add resource handlers for serving static resources.
     *
     * @param registry
     * @see ResourceHandlerRegistry
     */
    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/js/**").addResourceLocations("classpath:/static/js/");
        registry.addResourceHandler("/statics/**").addResourceLocations("classpath:/static/statics/");
        registry.addResourceHandler("swagger-ui.html")
                .addResourceLocations("classpath:/META-INF/resources/");
        registry.addResourceHandler("/webjars/**")
                .addResourceLocations("classpath:/META-INF/resources/webjars/");
        super.addResourceHandlers(registry);
    }

    /**
     * Override this method to configure cross origin requests processing.
     *
     * @param registry
     * @see CorsRegistry
     * @since 4.2
     */
    @Override
    protected void addCorsMappings(CorsRegistry registry) {
        super.addCorsMappings(registry);
    }
    /**
     * Override this method to add Spring MVC interceptors for
     * pre- and post-processing of controller invocation.
     *
     * @param registry
     * @see InterceptorRegistry
     */
    @Override
    protected void addInterceptors(InterceptorRegistry registry) {
        super.addInterceptors(registry);
    }
}

3. 定义json方法

package com.skindow.util;

import com.alibaba.fastjson.JSON;

/**
 * Created by Administrator on 2019/9/3.
 */
public class MyJson {
    public static String toJson(Object src) {
        String json = JSON.toJSONString(src);
        return json;
    }
}

4. 配置Freemarker的配置

FreeMarker内部使用的变量的类型都实现了freemarker.template.TemplateModel接口。

我们需要把我们刚才的自定义类包装成TemplateModel的子类TemplateHashModel

package com.skindow.util;

import freemarker.ext.beans.BeansWrapper;
import freemarker.ext.beans.BeansWrapperBuilder;
import freemarker.template.Configuration;
import freemarker.template.TemplateHashModel;
import freemarker.template.TemplateModelException;
import lombok.extern.slf4j.Slf4j;

import java.util.HashMap;
import java.util.Map;

/**
 * Created by Administrator on 2019/9/3.
 */
@Slf4j
public class FreemarkerStaticModels extends HashMap<String, Object> {
    public FreemarkerStaticModels(Map<String, String> classMap) {
        for (String key : classMap.keySet()) {
            put(key, getModel(classMap.get(key)));
        }
    }
    private TemplateHashModel getModel(String packageName) {
        BeansWrapper wrapper = new BeansWrapperBuilder(Configuration.VERSION_2_3_28).build();
        TemplateHashModel fileStatics=null;
        try {
            fileStatics = (TemplateHashModel)  wrapper.getStaticModels().get(packageName);
            return fileStatics;
        } catch (TemplateModelException e) {
            log.error(e.toString());
        }
        return fileStatics;
    }
}

package com.skindow.config;

import com.skindow.util.FreemarkerStaticModels;
import freemarker.template.TemplateException;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.ui.freemarker.FreeMarkerConfigurationFactory;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;
import org.springframework.web.servlet.view.freemarker.FreeMarkerView;
import org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver;

import java.io.IOException;
import java.util.HashMap;
import java.util.Properties;

/**
 * Created by Administrator on 2019/9/3.
 */
@Configuration
public class FreeMarkerConfig {
    @Bean
    public ViewResolver viewResolverFtl() {
        FreeMarkerViewResolver resolver = new FreeMarkerViewResolver();
        resolver.setCache(false);
        resolver.setViewClass(FreeMarkerView.class);
        resolver.setRequestContextAttribute("re");
        resolver.setExposeRequestAttributes(true);
        resolver.setExposeSessionAttributes(true);
        resolver.setSuffix(".ftl");
        resolver.setContentType("text/html;charset=UTF-8");
        resolver.setOrder(0);

        //添加自定义解析器
        resolver.setAttributesMap(new FreemarkerStaticModels(new HashMap<String, String>()
        {{
            put("Json", "com.skindow.util.MyJson");
        }}));
        return resolver;
    }



    @Bean
    public FreeMarkerConfigurer freemarkerConfig() throws IOException, TemplateException {
        FreeMarkerConfigurationFactory factory = new FreeMarkerConfigurationFactory();
        factory.setTemplateLoaderPath("classpath:static/view/");
        factory.setDefaultEncoding("UTF-8");
        factory.setPreferFileSystemAccess(false);
        FreeMarkerConfigurer result = new FreeMarkerConfigurer();
        freemarker.template.Configuration configuration = factory.createConfiguration();
        configuration.setClassicCompatible(true);
        result.setConfiguration(configuration);
        Properties settings = new Properties();
        settings.put("template_update_delay", "0");
        settings.put("default_encoding", "UTF-8");
        settings.put("number_format", "0.######");
        settings.put("classic_compatible", true);
        settings.put("template_exception_handler", "ignore");
        result.setFreemarkerSettings(settings);
        return result;
    }

}

5. 控制类

package com.skindow.controller;

import com.skindow.service.UserService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * Created by Administrator on 2019/9/3.
 */
@Controller
@Slf4j
@RequestMapping("/welcome/demo")
@Api("skindow-test")
public class IndexController {
    @Autowired
    private UserService userService;

    @RequestMapping("/index")
    @ApiOperation(httpMethod = "GET", value = "通过ID查询用户", consumes = "application/json")
    public String queryUserById(Model model, @RequestParam(value = "id") String id)
    {
        model.addAttribute("user",userService.getUser(id));
        return "index";
    }
}

6. view

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>welcome to here</title>
</head>
<body>
<h1>user toJson : ${Json.toJson(user)}</h1>
</body>
</html>

目录大致这样

7. 启动测试
   http://localhost:8089/welcome/demo/index?id=1
   结果如下
   

项目地址 github 对应tag freemarkerDemo

最后

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