Springboot learn from scratch notes (b) -Spring boot return json data (non-Chinese garbled)

Json create entity classes, as follows:

public class Demo {

    private int age;
    
    private String address;
    
    private String name;
    
    private String remark;
    
    private Date createTime;

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }
    
}

A: jackson return json data using, as follows:

Description: spring boot default json analytic framework jsckson resolution, there is no need to add any dependency;

code show as below:

@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String hello(){
        
        return "hello";
    }
    
    @RequestMapping("/getDemo")
    public Demo getDemo(){
        
        Demo demo = new Demo();
        demo.setAddress("谁登录看风景");
        demo.setAge(11);
        demo.setCreateTime(new Date());
        return demo;
    }
}

direct interview:

Two: Use fastjson

You need to add a dependency:

<dependency> 
    <groupId> com.alibaba </ groupId> 
    <artifactId> FASTJSON </ artifactId> 
    <Version> 1.2.15 </ Version> 
</ dependency> 

to say at this very important, said the official documents of 1 .2.10 later, there will be two ways to support HttpMessageconvert, one FastJsonHttpMessageConverter, supports the following version 4.2, supports more than one FastJsonHttpMessageConverter4 version 4.2, 
specifically what is the difference being no in-depth study. Here it is to say: do not support the version of the low, so here is 1.2.10+ minimum requirements.

 Configuration fastjon (supports two methods)

The first:

(1) Start WebMvcConfigurerAdapter class inherits the extends
(2) covering method configureMessageConverters

code show as below:

@SpringBootApplication
public class App extends WebMvcConfigurerAdapter 
{
    public static void main( String[] args )
    {
        System.out.println( "--------------开始启动---------------!" );
        SpringApplication.run(App.class, args);
        System.out.println( "--------------启动成功---------------!" );
    }
    
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        // TODO Auto-generated method stub
        super.configureMessageConverters(converters);
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();

        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(
                SerializerFeature.PrettyFormat
        );

        //处理中文乱码问题
        List<MediaType> fastMediaTypes = new ArrayList<>();
        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        fastConverter.setSupportedMediaTypes(fastMediaTypes);
        
        fastConverter.setFastJsonConfig(fastJsonConfig);
        
        converters.add(fastConverter);
    }
}

Restart, then visit:

 The second: In the startup class App.java injected Bean: HttpMessageConverters, code is as follows:

import java.util.ArrayList;
import java.util.List;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.web.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;

@SpringBootApplication
public class App extends WebMvcConfigurerAdapter 
{
    public static void main( String[] args )
    {
        System.out.println( "--------------开始启动---------------!" );
        SpringApplication.run(App.class, args);
        System.out.println( "--------------启动成功---------------!" );
    }
        
    @Bean
    public HttpMessageConverters fastJsonHttpMessageConverters() {
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
        
        //处理中文乱码问题
        List<MediaType> fastMediaTypes = new ArrayList<>();
        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        fastConverter.setSupportedMediaTypes(fastMediaTypes);
        
        fastConverter.setFastJsonConfig(fastJsonConfig);
        HttpMessageConverter<?> converter = fastConverter;
        return new HttpMessageConverters(converter);
    }

}

Note: Do not guide the wrong package, is: import org.springframework.http.MediaType;

The results after the first visit and the same;

The first and second can be used, according to your own personal preferences;

After using fastjson framework, it may also be used to annotate fastjson json data returned special handling, as follows:

@JSONField (the format = "the MM-dd-YYYY HH: mm: SS" ) // Returns formatted date 
Private a Date createTime ;
 
@JSONField (the serialize = to false) // whether the serialization attribute, if false, then the the data does not return information 
Private String Use the remark ;

Other characteristics of their own interest research;