离线数据包

该处介绍了除Nginx服务器之外几类服务器的配置。

Apache

1）Apache未启用gzip特性时，httpd.conf文件末尾添加

Header set Content-Encoding "gzip"
"expr=%{REQUEST_URI} =~ m#.*.gz$#"

2）Apache启用gzip特性时，需要对gz请求禁用gzip功能，httpd.conf文件在对应的gzip配置处添加

DeflateCompressionLevel 6
SetOutputFilter DEFLATE
SetEnvIfNoCase Request_URI .(?:exe|t?gz|zip|bz2|sit|rar)$ no-gzip dont-vary
Header set Content-Encoding "gzip"

Tomcat

Tomcat不支持在配置文件中设置，因此只能通过代码在拦截器中设置头信息。具体步骤：  

1. 编写Filter类，对gz请求响应添加“Content-Encoding”头属性

package com.bimface.offline.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;

public class GzFilter implements Filter {

  @Override
  public void init(FilterConfig filterConfig) throws ServletException {
  }

  @Override
  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
      throws IOException, ServletException {
    HttpServletResponse response = (HttpServletResponse) servletResponse;
    
    //告诉响应头以gzip格式解码,启用浏览器gzip解压
    response.setCharacterEncoding("UTF-8");
    response.setHeader("Content-Encoding", "gzip");
    response.setContentType("application/json;charset=utf-8");
    try {
      filterChain.doFilter(servletRequest, servletResponse);
    } catch (ServletException e) {
      e.printStackTrace();
    }
  }

  @Override
  public void destroy() {
  }
}

2. Filter打包Jar放入Tomcat\lib目录下
3. 对Tomcat的web.xml文件添加全局Filter配置

<filter>  
  <filter-name>gzFilter</filter-name>  
  <filter-class>com.bimface.offline.filter.GzFilter</filter-class>  
</filter>  
<filter-mapping>  
  <filter-name>gzFilter</filter-name>  
  <url-pattern>*.gz</url-pattern>
</filter-mapping>

IIS

无需更改。

NodeJS

在NodeJS服务中对gz请求响应添加“Content-Encoding”头属性，类似

response.writeHeader(200,{
  'Content-Encoding' : 'gzip',
  'content-type' : 'application/octet-stream'
});

例如Server.js：

var port = 8888;
var http = require('http');
var fs = require('fs');
var path = require('path');
const mime = require('mime');

var documentRoot = './databag'; //需要访问的离线数据包文件的存放目录

var server= http.createServer(function(req,res){
    var url = req.url; 
    var file = documentRoot + url;
    var extname = path.extname(file);

    fs.readFile(file, function(err,data){
        if(err){
            res.writeHeader(404,{
                'content-type' : 'text/html;charset="utf-8"'
            });
            res.write('<h1>404错误</h1><p>你要找的页面不存在</p>');
            res.end();
        }else{
			if(url.substr(url.length-3, 3) == ".gz"){
				res.writeHeader(200,{
					'Content-Encoding' : 'gzip',
					'Content-type' : 'application/octet-stream'
				});
			}else{
                var contentType = mime.getType(extname);
				res.writeHeader(200,{
					'Content-type' : contentType
				});
			}
			res.write(data);
			res.end();
        }
    });

}).listen(port);