springboot对压缩请求的处理方法是什么

springboot对压缩请求的处理

最近对接银联需求，为了节省带宽，需要对报文进行压缩处理。但是使用springboot自带的压缩设置不起作用：

server.compression.enabled=true
server.compression.mime-types=application/javascript,text/css,application/json,application/xml,text/html,text/xml,text/plain
server.compression.compressionMinSize=10

server.compression.enabled：表示是否开启压缩，默认开启，true:开启，false:不开启
server.compression.mime-types：压缩的内容的类型，有xml,json，html等格式
server.compression.compressionMinSize：开启压缩数据最小长度，单位为字节，默认是2048字节
源码如下：

public class Compression {
    private boolean enabled = false;
    private String[] mimeTypes = new String[]{"text/html", "text/xml", "text/plain", "text/css", "text/javascript", "application/javascript", "application/json", "application/xml"};
    private String[] excludedUserAgents = null;
    private int minResponseSize = 2048;
}

一、Tomcat设置压缩原理

tomcat压缩是对响应报文进行压缩，当请求头中存在accept-encoding时，如果Tomcat设置了压缩，则会在响应时对数据进行压缩。
tomcat压缩源码是在Http11Processor中设置的：

public class Http11Processor extends AbstractProcessor {
  private boolean useCompression() {
        // Check if browser support gzip encoding
        MessageBytes acceptEncodingMB =
            request.getMimeHeaders().getValue("accept-encoding");
        if ((acceptEncodingMB == null)-->当请求头没有这个字段是不进行压缩
            || (acceptEncodingMB.indexOf("gzip") == -1)) {
            return false;
        }
        // If force mode, always compress (test purposes only)
        if (compressionLevel == 2) {
            return true;
        }
        // Check for incompatible Browser
        if (noCompressionUserAgents != null) {
            MessageBytes userAgentValueMB =
                request.getMimeHeaders().getValue("user-agent");
            if(userAgentValueMB != null) {
                String userAgentValue = userAgentValueMB.toString();
                if (noCompressionUserAgents.matcher(userAgentValue).matches()) {
                    return false;
                }
            }
        }
        return true;
    }
}

二、银联报文压缩

作为发卡机构，银联报文请求报文是压缩的，且报文头中不存在accept-encoding字段，无法直接使用tomcat配置进行压缩解压。
需要单独处理这种请求

@RestController
@RequestMapping("/user")
public class UserController {
    private static final Logger logger = LoggerFactory.getLogger(UserController.class);
    /**
     *
     * application/xml格式报文
     * */
    @PostMapping(path = "/test", produces = MediaType.APPLICATION_XML_VALUE, consumes = MediaType.APPLICATION_XML_VALUE)
    public void getUserInfoById(HttpServletRequest request, HttpServletResponse response) throws IOException {
        String requestBody;
        String resultBody="hello,wolrd";
        byte[] returnByte;
        if (StringUtils.isNoneEmpty(request.getHeader("Content-encoding"))) {
            logger.info("报文压缩，需要进行解压");
            //业务处理
            //返回报文也同样需要进行压缩处理
            assemleResponse(request,response,resultBody);
        }
    }
    public static void assemleResponse(HttpServletRequest request, HttpServletResponse response,String resultBody) throws IOException {
        response.setHeader("Content-Type","application/xml;charset=UTF-8");
        response.setHeader("Content-Encoding","gzip");
        byte[] returnByte=GzipUtil.compress(resultBody);
        OutputStream outputStream=response.getOutputStream();
        outputStream.write(returnByte);
    }
}

public class GzipUtil {
    public static String uncompress(byte[] bytes){
        if (bytes == null || bytes.length == 0) {
            return null;
        }
        String requestBody=null;
        ByteArrayInputStream byteArrayInputStream=new ByteArrayInputStream(bytes);
        GZIPInputStream gzipInputStream = null;
        try {
            gzipInputStream = new GZIPInputStream(byteArrayInputStream);
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int temp;
            while ((temp = gzipInputStream.read(buffer)) != -1) {
                byteArrayOutputStream.write(buffer, 0, temp);
            }
            requestBody = new String(byteArrayOutputStream.toByteArray(), StandardCharsets.UTF_8);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return  requestBody;
    }
    public static String uncompress(HttpServletRequest request){
        String requestBody=null;
        int length = request.getContentLength();
        try {
            BufferedInputStream bufferedInputStream = new BufferedInputStream(request.getInputStream());
            GZIPInputStream gzipInputStream = new GZIPInputStream(bufferedInputStream);
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int temp;
            while ((temp = gzipInputStream.read(buffer)) != -1) {
                byteArrayOutputStream.write(buffer, 0, temp);
            }
            requestBody = new String(byteArrayOutputStream.toByteArray(), StandardCharsets.UTF_8);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return  requestBody;
    }
    public static byte[] compress(String src){
        if (src == null || src.length() == 0) {
            return null;
        }
        ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream();
        try {
            GZIPOutputStream gzipOutputStream=new GZIPOutputStream(byteArrayOutputStream);
            gzipOutputStream.write(src.getBytes(StandardCharsets.UTF_8));
            gzipOutputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        byte[] bytes=byteArrayOutputStream.toByteArray();
        return bytes;
    }
}

补充：java springbooot使用gzip压缩字符串

import lombok.extern.slf4j.Slf4j;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
/**
 * effect:压缩/解压 字符串
 */
@Slf4j
public class CompressUtils {
    /**
     * effect 使用gzip压缩字符串
     * @param str 要压缩的字符串
     * @return
     */
    public static String compress(String str) {
        if (str == null || str.length() == 0) {
            return str;
        }
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        GZIPOutputStream gzip = null;
        try {
            gzip = new GZIPOutputStream(out);
            gzip.write(str.getBytes());
        } catch (IOException e) {
            log.error("",e);
        } finally {
            if (gzip != null) {
                try {
                    gzip.close();
                } catch (IOException e) {
                    log.error("",e);
                }
            }
        }
        return new sun.misc.BASE64Encoder().encode(out.toByteArray());
//        return str;
    }
    /**
     * effect 使用gzip解压缩
     *
     * @param str 压缩字符串
     * @return
     */
    public static String uncompress(String str) {
        if (str == null) {
            return null;
        }
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ByteArrayInputStream in = null;
        GZIPInputStream ginzip = null;
        byte[] compressed = null;
        String decompressed = null;
        try {
            compressed = new sun.misc.BASE64Decoder().decodeBuffer(str);
            in = new ByteArrayInputStream(compressed);
            ginzip = new GZIPInputStream(in);
            byte[] buffer = new byte[1024];
            int offset = -1;
            while ((offset = ginzip.read(buffer)) != -1) {
                out.write(buffer, 0, offset);
            }
            decompressed = out.toString();
        } catch (IOException e) {
            log.error("",e);
        } finally {
            if (ginzip != null) {
                try {
                    ginzip.close();
                } catch (IOException e) {
                }
            }
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                }
            }
        }
        return decompressed;
    }
}

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