springboot对压缩请求的处理方法
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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=10server.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);
@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 class="lazy" data-src){
if (class="lazy" data-src == null || class="lazy" data-src.length() == 0) {
return null;
}
ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream();
try {
GZIPOutputStream gzipOutputStream=new GZIPOutputStream(byteArrayOutputStream);
gzipOutputStream.write(class="lazy" data-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;
@Slf4j
public class CompressUtils {
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;
}
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;
}
}到此这篇关于springboot对压缩请求的处理的文章就介绍到这了,更多相关springboot压缩请求内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
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