Spring boot如何配置请求的入参和出参json数据格式

这篇文章主要介绍了spring boot如何配置请求的入参和出参json数据格式,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

请求入参数据格式配置，以日期格式为例：

编写日期编辑器类：

import first.zxz.tools.DateUtil;
import java.beans.PropertyEditorSupport;
/**
 * 日期编辑器
 *
 * @author zhangxz
 * @date 2019-11-12 20:01
 */
public class DateEditor extends PropertyEditorSupport {
 /**
  * 是否将null转换为空字符串
  */
 private final boolean nullAsEmpty;
 public DateEditor() {
  this(true);
 }
 public DateEditor(boolean nullAsEmpty) {
  this.nullAsEmpty = nullAsEmpty;
 }
 @Override
 public void setAsText(String text) {
  if (text == null) {
   if (nullAsEmpty) {
    setValue("");
   } else {
    setValue(null);
   }
  } else {
   setValue(DateUtil.parse(text));
  }
 }

}

其中用到的日期工具类如下：

public class DateUtil {

 private static final String DATE_FORMAT_1 = "yyyy-MM-dd";
 private static final String DATE_FORMAT_2 = "yyyy/MM/dd";
 private static final String DATE_FORMAT_3 = "yyyyMMdd";
 private static final String DATE_TIME_FORMAT_1 = DATE_FORMAT_1 + " HH:mm:ss";
 private static final String DATE_TIME_FORMAT_2 = DATE_FORMAT_2 + " HH:mm:ss";
 private static final String DATE_TIME_FORMAT_3 = DATE_FORMAT_3 + "HHmmss";

 //key为正则表达式，value为对应的日期格式
 private static final HashMap<String, String> DATE_REGEX_FORMATTER_MAP = new HashMap<>();

 static {
  DATE_REGEX_FORMATTER_MAP.put(DateRegexConst.DATE_1, DATE_FORMAT_1);
  DATE_REGEX_FORMATTER_MAP.put(DateRegexConst.DATE_2, DATE_FORMAT_2);
  DATE_REGEX_FORMATTER_MAP.put(DateRegexConst.DATE_3, DATE_FORMAT_3);
  DATE_REGEX_FORMATTER_MAP.put(DateRegexConst.DATE_TIME_1, DATE_TIME_FORMAT_1);
  DATE_REGEX_FORMATTER_MAP.put(DateRegexConst.DATE_TIME_2, DATE_TIME_FORMAT_2);
  DATE_REGEX_FORMATTER_MAP.put(DateRegexConst.DATE_TIME_3, DATE_TIME_FORMAT_3);
 }

 //提示语：所有可用的日期格式
 public static final String ALL_USABLE_DATE_FORMATS = DATE_REGEX_FORMATTER_MAP.values().toString() + "，以及时间戳；";

 /**
  * 根据输入的字符串，进行格式化，并输入日期数据
  * 注意：格式化之前，会进行null和空字符串过滤；格式化时，会去除字符串两端的空字符串
  *
  * @param formattedDateStr 日期字符串数据
  * @return java.util.Date
  * @author Zxz
  * @date 2019/11/6 15:07
  **/
 public static Date parse(String formattedDateStr) {
  if (formattedDateStr == null || formattedDateStr.trim().length() <= 0) {
   throw new StringEmptyException();
  }

  for (Map.Entry<String, String> entry : DATE_REGEX_FORMATTER_MAP.entrySet()) {
   if (formattedDateStr.trim().matches(entry.getKey())) {
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat(entry.getValue());
    try {
     return simpleDateFormat.parse(formattedDateStr.trim());
    } catch (ParseException e) {
     e.printStackTrace();
     throw new DateFormatException();
    }
   }
  }

  try {
   Long aLong = Long.valueOf(formattedDateStr);
   return new Date(aLong);
  } catch (NumberFormatException e) {
   //格式不匹配
   throw new DateFormatException();
  }

 }
}

把编辑器加入web的绑定初始化配置：

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.format.support.FormattingConversionService;
import org.springframework.validation.Validator;
import org.springframework.web.bind.support.ConfigurableWebBindingInitializer;
import simple.proj.zxz.play.config.editor.DateEditor;

import java.util.Date;

/**
 * 配置请求 bean数据接收格式，例如date格式
 *
 * @author zhangxz
 * @date 2019-11-12 19:56
 */

@Configuration
public class WebBindingInitializerConfig {

 /**
  * 配置请求入参数据格式，参考{@link simple.proj.zxz.play.config.editor.DateEditor}
  *
  * @param mvcConversionService mvc版本业务
  * @param mvcValidator   mvc校验器
  * @return org.springframework.web.bind.support.ConfigurableWebBindingInitializer
  * @author zhangxz
  * @date 2019/11/13 10:40
  */
 @Bean
 public ConfigurableWebBindingInitializer configurableWebBindingInitializer(FormattingConversionService mvcConversionService, Validator mvcValidator) {
  ConfigurableWebBindingInitializer initializer = new ConfigurableWebBindingInitializer();
  initializer.setConversionService(mvcConversionService);
  initializer.setValidator(mvcValidator);

  initializer.setPropertyEditorRegistrar(propertyEditorRegistry -> {
   //PropertyEditor 非线程安全
   propertyEditorRegistry.registerCustomEditor(Date.class, new DateEditor());
  });
  return initializer;
 }
}

入参的日期数据格式配置完成，可以接收的日期格式在日期工具类可以看到，有以下几种：yyyy-mm-dd，时间戳，yyyy-mm-dd hh:mm:ss等。

请求出参格式配置，包括空字符串，空数组，以及日期格式化输出

编写空字符串序列器：

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

import java.io.IOException;

/**
 * 空字符串序列器
 *
 * @author zhangxz
 * @date 2019-11-12 22:05
 */
public class NullStringSerializer extends JsonSerializer {

 @Override
 public void serialize(Object o, JsonGenerator jsonGenerator, SerializerProvider serializerProvider)
   throws IOException, JsonProcessingException {
  jsonGenerator.writeString("");
 }
}

编写空数组序列器

/**
 * 空数组或集合序列器
 *
 * @author zhangxz
 * @date 2019-11-12 22:04
 */

public class NullArraySerializer extends JsonSerializer {

 @Override
 public void serialize(Object value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonProcessingException {
  jgen.writeStartArray();
  jgen.writeEndArray();
 }
}

编写日期序列器

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

import java.io.IOException;
import java.util.Date;

/**
 * 日期序列器
 *
 * @author zhangxz
 * @date 2019-11-12 23:01
 */
public class DateSerializer extends JsonSerializer {

 /**
  * 日期序列化方法，返回时间戳格式
  *
  * @param o     数值
  * @param jsonGenerator  json生成器
  * @param serializerProvider 序列器
  * @author zhangxz
  * @date 2019/11/13 10:41
  */
 @Override
 public void serialize(Object o, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
  jsonGenerator.writeNumber(((Date) o).getTime());
 }
}

编写总序列器

import com.fasterxml.jackson.databind.BeanDescription;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializationConfig;
import com.fasterxml.jackson.databind.ser.BeanPropertyWriter;
import com.fasterxml.jackson.databind.ser.BeanSerializerModifier;

import java.util.Collection;
import java.util.Date;
import java.util.List;

/**
 * 总序列器
 *
 * @author zhangxz
 * @date 2019-11-12 22:07
 */

public class GeneralSerializer extends BeanSerializerModifier {

 //空数组
 private JsonSerializer _nullArraySerializer = new NullArraySerializer();
 //空字符串
 private JsonSerializer _nullStringSerializer = new NullStringSerializer();
 //日期类型
 private JsonSerializer dateSerializer = new DateSerializer();

 @Override
 public List<BeanPropertyWriter> changeProperties(SerializationConfig config, BeanDescription beanDesc,
              List<BeanPropertyWriter> beanProperties) {
  for (BeanPropertyWriter beanProperty : beanProperties) {
   if (isArrayType(beanProperty)) {
    beanProperty.assignNullSerializer(this._nullArraySerializer);
   } else if (isStringType(beanProperty)) {
    beanProperty.assignNullSerializer(this._nullStringSerializer);
   } else if (isDateType(beanProperty)) {
    beanProperty.assignSerializer(this.dateSerializer);
   }
  }
  return beanProperties;
 }

 private boolean isStringType(BeanPropertyWriter writer) {
  Class clazz = writer.getType().getRawClass();
  return clazz == String.class;
 }

 private boolean isDateType(BeanPropertyWriter writer) {
  return Date.class == writer.getType().getRawClass();
 }

 private boolean isArrayType(BeanPropertyWriter writer) {
  Class clazz = writer.getType().getRawClass();
  return clazz.isArray() || Collection.class.isAssignableFrom(clazz);
 }
}

把总序列器加入web配置中：

import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import simple.proj.zxz.play.config.serializer.GeneralSerializer;

/**
 * @description: 配置jackson 序列器
 * @author: zhangxz
 * @create: 2019-11-12 22:02
 */


@Configuration
public class JacksonConfig {

 /**
  * 出参数据格式配置，参考类 {@link simple.proj.zxz.play.config.serializer.GeneralSerializer}
  *
  * @return org.springframework.http.converter.json.MappingJackson2HttpMessageConverter
  * @author zhangxz
  * @date 2019/11/13 10:34
  */
 @Bean
 public MappingJackson2HttpMessageConverter mappingJacksonHttpMessageConverter() {

  final MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
  ObjectMapper mapper = converter.getObjectMapper();
  mapper.setSerializerFactory(mapper.getSerializerFactory().withSerializerModifier(new GeneralSerializer()));

  return converter;
 }
}

请求出参配置完成，出参格式如下：null的字符串输出为空字符串，null的数组输出为空数组，date数据格式输出为时间戳。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持小牛知识库。