@Configuration
public class FastJsonHttpMessageConverterConfig {@Beanpublic HttpMessageConverters fastJsonHttpMessageConverters(){//1.需要定义一个convert转换消息的对象;FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();//2:添加fastJson的配置信息;FastJsonConfig fastJsonConfig = new FastJsonConfig();fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);//3处理中文乱码问题List<MediaType> fastMediaTypes = new ArrayList<>();fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);//4.在convert中添加配置信息.
        fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes);fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);HttpMessageConverter<?> converter = fastJsonHttpMessageConverter;return new HttpMessageConverters(converter);}
}

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.MapperFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import java.util.List;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;/*** Created by qhong on 2018/6/1 10:59**/
@ControllerAdvice
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {@Overridepublic void configureMessageConverters(List<HttpMessageConverter<?>> converters) {Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();builder.serializationInclusion(JsonInclude.Include.NON_NULL);ObjectMapper objectMapper = builder.build();SimpleModule simpleModule = new SimpleModule();simpleModule.addSerializer(Long.class, ToStringSerializer.instance);objectMapper.registerModule(simpleModule);objectMapper.configure(MapperFeature.PROPAGATE_TRANSIENT_MARKER, true);// 忽略 transient 修饰的属性converters.add(new MappingJackson2HttpMessageConverter(objectMapper));//字符串转换器//StringHttpMessageConverter converter  = new StringHttpMessageConverter(Charset.forName("UTF-8"));//converters.add(converter);//FastJson转换器
//        //1.需要定义一个convert转换消息的对象;
//        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
//        //2.添加fastJson的配置信息，比如：是否要格式化返回的json数据;
//        FastJsonConfig fastJsonConfig = new FastJsonConfig();
//        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
//        //3处理中文乱码问题
//        List<MediaType> fastMediaTypes = new ArrayList<>();
//        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
//        //4.在convert中添加配置信息.
//        fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes);
//        fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
//        //5.将convert添加到converters当中.
//        converters.add(fastJsonHttpMessageConverter);
super.configureMessageConverters(converters);}@Overridepublic void extendMessageConverters(List<HttpMessageConverter<?>> converters) {System.out.println("Converters:Begin");System.out.println("num:"+converters.size());for (HttpMessageConverter<?> messageConverter : converters) {System.out.println(messageConverter);}System.out.println("Converters:End");}
}

    @Overridepublic void extendMessageConverters(List<HttpMessageConverter<?>> converters) {converters.clear();converters.add(new FastJsonHttpMessageConverter());}

package org.springframework.http.converter;import java.io.IOException;
import java.util.List;import org.springframework.http.HttpInputMessage;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;public interface HttpMessageConverter<T> {boolean canRead(Class<?> clazz, MediaType mediaType);boolean canWrite(Class<?> clazz, MediaType mediaType);List<MediaType> getSupportedMediaTypes();T read(Class<? extends T> clazz, HttpInputMessage inputMessage)throws IOException, HttpMessageNotReadableException;void write(T t, MediaType contentType, HttpOutputMessage outputMessage)throws IOException, HttpMessageNotWritableException;}

@RequestMapping(value="/query", method=RequestMethod.POST)
public @ResponseBody User queryUser(@RequestBody String tel) {return query(tel);
}

public class MyMessageConverter extends AbstractHttpMessageConverter<DemoObj> {public MyMessageConverter() {//x-zyf 是自定义的媒体类型super(new MediaType("application", "x-zyf", Charset.forName("Utf-8")));}@Overrideprotected boolean supports(Class<?> aClass) {//表示只支持DemoObj这个类//return DemoObj.class.isAssignableFrom(aClass);//返回false则不会支持任何类，要想使用，就需要返回truereturn true;}/*** 重写readInternal方法* 处理请求中的数据** @param aClass* @param httpInputMessage* @return* @throws IOException* @throws HttpMessageNotReadableException*/@Overrideprotected DemoObj readInternal(Class<? extends DemoObj> aClass, HttpInputMessage httpInputMessage) throws IOException, HttpMessageNotReadableException {//获得请求中的数据，得到字符串形式String temp = StreamUtils.copyToString(httpInputMessage.getBody(), Charset.forName("UTF-8"));//前端请求的格式是我们自己约定的String[] tempArr = temp.split("-");return new DemoObj(new Long(tempArr[0]), tempArr[1]);}/*** 重写writeInternal方法* 处理任何输出数据到response** @param obj  要输出到response的对象* @param httpOutputMessage* @throws IOException* @throws HttpMessageNotWritableException*/@Overrideprotected void writeInternal(DemoObj obj, HttpOutputMessage httpOutputMessage) throws IOException, HttpMessageNotWritableException {String out = "hello：" + obj.getId() + "-" + obj.getName();httpOutputMessage.getBody().write(out.getBytes());}
}

public class MappingJackson2HttpMessageConverter extends AbstractHttpMessageConverter<Object> {public static final ObjectMapper mapper = new ObjectMapper();public static final Logger LOG = LoggerFactory.getLogger(MappingJackson2HttpMessageConverter.class);private boolean encryptFlag = false;public void setEncryptFlag(boolean encryptFlag) {this.encryptFlag = encryptFlag;}public MappingJackson2HttpMessageConverter() {super(new MediaType("application", "json", Charset.forName("UTF-8")));}protected boolean supports(Class<?> clazz) {return true;}protected Object readInternal(Class<?> clazz, HttpInputMessage inputMessage) throws IOException, HttpMessageNotReadableException {return mapper.readValue(inputMessage.getBody(), clazz);}protected void writeInternal(Object d, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {byte[] jsonBytes;if(d.getClass()!=HuishiUserLoginResponse.class) {BasicRes r = new BasicRes();if (d != null && d != SysConstant.NULL_RESPONSE) {LOG.info("====>>>>> 响应数据：response={}", d.toString());if (encryptFlag) {try {long repStart = System.currentTimeMillis();String json = ToJson(d);String data = CoderUtil.encryptAES(json);r.setData(data);long repEnd = System.currentTimeMillis();long repTime = repEnd - repStart;logger.info("加密耗时==>" + repTime + " ms");} catch (Exception e) {e.printStackTrace();}} else {r.setData(d);}}jsonBytes = ToJsonAsBytes(r);}else{jsonBytes = ToJsonAsBytes(d);}OutputStream out = outputMessage.getBody();out.write(jsonBytes, 0, jsonBytes.length);out.close();}public static byte[] ToJsonAsBytes(Object value) {try {return mapper.writeValueAsBytes(value);} catch (Exception var2) {LOG.error("ToJsonAsBytes error,Object:{}", value, var2);return null;}}public static String ToJson(Object value) {try {return mapper.writeValueAsString(value);} catch (Exception var2) {LOG.error("ToJosn error,Object:{}", value, var2);return "";}}
}