SpringBoot17 FastJson configuration, Druid configuration

1 FastJson configuration

　　1.1 Basic knowledge of FastJson

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　　1.2 SpringBoot integrates FastJson

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　　　　1.2.1 Import FastJson dependencies

        <!--fastjson-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.46</version>
        </dependency>

　　　　1.2.2 Configure FastJson

　　　　　　Tip 01: The configuration class must be at the same level or below the startup method

　　　　　　Trick 02: WebMvcConfigurerAdapter is outdated

　　　　　　　　Reference documents: click here

package cn.test.demo.base_demo.config;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

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

/** 
 * @author Wang Yangshuai
 * @create 2018-05-09 14:33
 * @desc FastJson configuration
 **/
@Configuration
public class FastJsonConfiguration extends WebMvcConfigurationSupport {

    @Override
    protected  void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
         // 01 call the super class configuration 
        super .configureMessageConverters(converters);
         // 02 instantiate the FastJson converter 
        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();

        // 03 Data type configuration 
        List<MediaType> supportedMediaTypes = new ArrayList<> ();
        supportedMediaTypes.add(MediaType.APPLICATION_JSON);
        supportedMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        supportedMediaTypes.add(MediaType.APPLICATION_ATOM_XML);
        supportedMediaTypes.add(MediaType.APPLICATION_FORM_URLENCODED);
        supportedMediaTypes.add(MediaType.APPLICATION_OCTET_STREAM);
        supportedMediaTypes.add(MediaType.APPLICATION_PDF);
        supportedMediaTypes.add(MediaType.APPLICATION_RSS_XML);
        supportedMediaTypes.add(MediaType.APPLICATION_XHTML_XML);
        supportedMediaTypes.add(MediaType.APPLICATION_XML);
        supportedMediaTypes.add(MediaType.IMAGE_GIF);
        supportedMediaTypes.add(MediaType.IMAGE_JPEG);
        supportedMediaTypes.add(MediaType.IMAGE_PNG);
        supportedMediaTypes.add(MediaType.TEXT_EVENT_STREAM);
        supportedMediaTypes.add(MediaType.TEXT_HTML);
        supportedMediaTypes.add(MediaType.TEXT_MARKDOWN);
        supportedMediaTypes.add(MediaType.TEXT_PLAIN);
        supportedMediaTypes.add(MediaType.TEXT_XML);
        fastJsonHttpMessageConverter.setSupportedMediaTypes(supportedMediaTypes);

        // 04 Create FastJson configuration class 
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures( // Modify FastJson filter configuration 
                SerializerFeature.DisableCircularReferenceDetect,
                SerializerFeature.WriteMapNullValue,
                SerializerFeature.WriteNullStringAsEmpty
        );

        // 05 Set the FastJson configuration class for the FastJson converter 
        fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);

        // 06 Add the FastJson converter to the list of view message converters 
        converters.add(fastJsonHttpMessageConverter);


    }
}

FastJsonConfiguration.java

　　1.3 Pit 01

　　　　1.3.1 Error messages

　　　　　　Spring Boot configures FastJson to report an error 'Content-Type' cannot contain wildcard type '*'

　　　　1.3.2 Solution

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2 Druid configuration

　　2.1 Import druid dependencies

        <!--druid数据库连接池-->
        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.29</version>
        </dependency>

　　2.2 Data source configuration

spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/testdemo?useUnicode=true&characterEncoding=UTF-8&&useSSL=false
    driver-class-name: com.mysql.jdbc.Driver
    username: root
    password: root
    type: com.alibaba.druid.pool.DruidDataSource
    #Maximum active count
    maxActive: 20
    #initialize the number
    initialSize: 1
    #Maximum connection wait timeout
    maxWait: 60000
    #Open PSCache and specify the size of each connection PSCache
    poolPreparedStatements: true
    maxPoolPreparedStatementPerConnectionSize: 20
    #Open the mergeSql function through the connectionProperties property; slow SQL records
    #connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
    minIdle: 1
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: select 1 from dual
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    #Configure the filters for monitoring statistics interception, after removing the monitoring interface sql will not be able to count, 'wall' is used for firewalls
    filters: stat, wall, log4j

  jpa:
    properties:
      hibernate:
        show_sql: true
        format_sql: true

　　2.3 Druid configuration class

package cn.test.demo.base_demo.config;

import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/** 
 * @author Wang Yangshuai
 * @create 2018-05-09 11:31
 * @desc database monitoring configuration
 **/
@Configuration
public class DruidConfigruration {
    @Bean
    public ServletRegistrationBean statViewServlet(){
         // Create servlet registration entity 
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean( new StatViewServlet(),"/druid/*" );
         // Set ip whitelist 
        servletRegistrationBean.addInitParameter("allow","127.0.0.1" );
         // Set ip blacklist, if allow and deny coexist, deny takes precedence over allow 
        servletRegistrationBean.addInitParameter("deny","192.168.0.19" );
         // Set console management user 
        servletRegistrationBean.addInitParameter("loginUsername" ,"druid" );
        servletRegistrationBean.addInitParameter( "loginPassword","123456" );
         // Whether the data can be reset 
        servletRegistrationBean.addInitParameter("resetEnable","false" );
         return servletRegistrationBean;
    }

    @Bean
    public FilterRegistrationBean statFilter(){
         // Create a filter 
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean( new WebStatFilter());
         // Set the filter path 
        filterRegistrationBean.addUrlPatterns("/*" );
         // Ignore the form of filtering 
        filterRegistrationBean.addInitParameter( "exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*" );
         return filterRegistrationBean;
    }

}

DruidConfigruration.java

　　2.4 Reference blog posts

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