如何在java中发送响应时压缩Rest服务中的数据（对象）

Question

my piece of code is

  @POST
  @Path("/getJSONCompareData")
  @Produces(MediaType.APPLICATION_JSON)
  public Object getJSONCompareData(@FormParam("testRunNum") String TRun,@FormParam("rptName") String reportName) {

   if(debugLevel>2)
      Log.debugLog(className, "getJSONStatsData", "", "", "Methad called");
      Object obj=null;
      try {
      int testRunNum = Integer.parseInt(TRun);
      String rptName = reportName;
      JSONParser parser=new JSONParser();
      String statsReportNameDir = Config.getWorkPath() + "/webapps/logs/TR" + testRunNum + "/reports/compareReports/" + rptName + "/compare.report";
                    obj=parser.parse(new FileReader(statsReportNameDir));
    }catch(Exception e){
      e.printStackTrace();
      Log.stackTraceLog(className, "getJSONStatsData", "", "", "Exception - ", e);
     }
          return obj;
   }

file size i am reading is approx 10MB

i want to compress data as it is taking 1 min over network

How i compress my Obj and handle in ajax call

Answer 1

You can compress JSON response using GZIP configuration on server.
Modern browsers supports gzip compressed content also Servers like Apache, Tomcat, JBoss etc supports gzip compression too.

Hence if gzip is enabled in server, it compress's data then sends to client.
you can refer article http://viralpatel.net/blogs/enable-gzip-compression-in-tomcat/

GZIP compression will increase performance not only for js,jsp files but also for http requests as data will be compressed

Answer 2

For compress data in Rest Service you have add(create) an annotation I have create an annotation name ** @Compress ** and implemented code for that on my server

import com.cavisson.gui.server.webdashboard.services.interceptors.Compress;

here is my class for compression

package com.cavisson.gui.server.webdashboard.services.interceptors;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import javax.ws.rs.NameBinding;

    /**
     * @Compress annotation is the name binding annotation.
     */
    @NameBinding
    @Retention(RetentionPolicy.RUNTIME)
    public @interface Compress {}

now i have bind this interface with my class GZIPWriterInterceptor withuse at rum time

package com.cavisson.gui.server.webdashboard.services.interceptors;

import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.GZIPOutputStream;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.Provider;
import javax.ws.rs.ext.WriterInterceptor;
import javax.ws.rs.ext.WriterInterceptorContext;

/**
 * This class is used for compressing data sending from server.
 */
@Provider
@Compress
public class GZIPWriterInterceptor implements WriterInterceptor
{
  @Override
  public void aroundWriteTo(WriterInterceptorContext context) throws IOException, WebApplicationException
  {
    try
    {
      MultivaluedMap<String,Object> headers = context.getHeaders();
      headers.add("Content-Encoding", "gzip");

      final OutputStream outputStream = context.getOutputStream();
      context.setOutputStream(new GZIPOutputStream(outputStream));
      context.proceed();
    }
    catch(IOException | WebApplicationException  e)
    {
      e.printStackTrace();
    }
    catch(Exception e)
    {
      e.printStackTrace();
    }
  }
}

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