解决后端给前端的返回数据过大的问题（压缩）

server/2024/10/25 7:18:37/

解决后端给前端的返回数据过大的问题（压缩）

问题

后端返回数据过大导致的前端接收数据慢的问题

方案

注解方式压缩后端给前端的返回数据，注解@Gzip压缩后端返回数据（前端不用做任何处理）


import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayOutputStream;
import java.util.Objects;
import java.util.zip.GZIPOutputStream;@Aspect
@Slf4j
@Component
public class GzipAspect {@Pointcut("@annotation(com.xxx.xxx.xxx.annotation.gzip.Gzip)")public void gzipAnnotation() {}@AfterReturning(pointcut = "gzipAnnotation()", returning = "result")public void applyGzipCompression(JoinPoint joinPoint, Object result) {HttpServletResponse response = ((ServletRequestAttributes) RequestContextHolder.currentRequestAttributes()).getResponse();if (Objects.isNull(response)) return;try {ObjectMapper mapper = new ObjectMapper();byte[] data = mapper.writeValueAsBytes(result);// 当返回体大于2048KB开启Gzipif (data.length < 2048 * 1024) {return;}response.setHeader("Content-Encoding", "gzip");response.setHeader("Vary", "Accept-Encoding");ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();GZIPOutputStream gzipOutputStream = new GZIPOutputStream(byteArrayOutputStream);gzipOutputStream.write(data);gzipOutputStream.close();byte[] compressedData = byteArrayOutputStream.toByteArray();response.setContentLength(compressedData.length);ServletOutputStream servletOutputStream = response.getOutputStream();servletOutputStream.write(compressedData);servletOutputStream.flush();servletOutputStream.close();} catch (Throwable e) {log.error("开启Gzip返回失败");log.error(e.getMessage());}}
}

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;/*** 对标注有@Gzip的接口进行gzip算法压缩**/
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Gzip {
}