Spring boot引入fastjson

梦里梦外; 2022-03-22 07:27 1756阅读 0赞

**目录**

1，导入指定版本的fastjson包

2，配置HttpConverterConfig类

3，编写测试类

4，说明

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# 1，导入指定版本的fastjson包 #

这里我选择1.2.55版本，因为自己学习研究用，所以，直接搞最新的。

pom.xml如下

<dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.55</version>
    </dependency>

# 2，配置HttpConverterConfig类 #

由于这是配置类，所以，建议新开一个package存放

代码目录如下

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E4MEM1MQ_size_16_color_FFFFFF_t_70][]

代码如下

package com.wayne.config;
    
    import com.alibaba.fastjson.serializer.SerializerFeature;
    import com.alibaba.fastjson.support.config.FastJsonConfig;
    import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
    import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.http.converter.HttpMessageConverter;
    
    @Configuration
    public class HttpConverterConfig {
    
        @Bean
        public HttpMessageConverters fasHttpMessageConverters(){
            //1.定义一个converters转换消息的对象
            FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
            //2.添加fastjson的配置信息
            FastJsonConfig fastJsonConfig = new FastJsonConfig();
            fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
            //3.在converter中添加配置信息
            fastConverter.setFastJsonConfig(fastJsonConfig);
            //4.将converter赋值给HttpMessageConverter
            HttpMessageConverter<?> converter = fastConverter;
            //5.返回HttpMessageConverters对象
            return new HttpMessageConverters(converter);
        }
    }

# 3，编写测试类 #

这里就用之前的那个Greeting类即可

代码如下

package com.wayne.controller;
    
    import java.util.concurrent.atomic.AtomicLong;
    
    import com.wayne.bean.Greeting;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class GreetingController {
    
        private static final String template = "Hello, %s!";
        private final AtomicLong counter = new AtomicLong();
    
        @RequestMapping("/greeting")
        public Greeting greeting(@RequestParam(value="name", defaultValue="World") String name) {
            return new Greeting(counter.incrementAndGet(),
                    String.format(template, name));
        }
    }

测试结果如下

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E4MEM1MQ_size_16_color_FFFFFF_t_70 1][]

# 4，说明 #

1）网上很多文章提到，启动类要继承**WebMvcConfigurerAdapter**这个类。但是由于spring5.0之后，这个类已经被废弃了。所以另外那种通过继承的方式，暂时不做推荐。

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E4MEM1MQ_size_16_color_FFFFFF_t_70 1]: /images/20220322/bed196b59e18472bb9490076ff0ff090.png