JavaでHTTP要求ヘッダーを取得する方法
この例は、JavaでHTTP要求ヘッダーを取得する方法を示しています。 HTTPリクエストヘッダーを取得するには、次のクラスが必要ですHttpServletRequest：
1. HttpServletRequestの例
1.1 Loop over the request header’s name and print out its value.
WebUtils.java
package com.example.web.utils;
import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
public class WebUtils {
private Map getHeadersInfo(HttpServletRequest request) {
Map map = new HashMap();
Enumeration headerNames = request.getHeaderNames();
while (headerNames.hasMoreElements()) {
String key = (String) headerNames.nextElement();
String value = request.getHeader(key);
map.put(key, value);
}
return map;
}
}
要求ヘッダーの例：
"headers" : {
"Host" : "example.com",
"Accept-Encoding" : "gzip,deflate",
"X-Forwarded-For" : "66.249.x.x",
"X-Forwarded-Proto" : "http",
"User-Agent" : "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)",
"X-Request-Start" : "1389158003923",
"Accept" : "*/*",
"Connection" : "close",
"X-Forwarded-Port" : "80",
"From" : "googlebot(at)googlebot.com"
}
1.2 Get the “user-agent” header only.
WebUtils.java
package com.example.web.utils;
import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
public class WebUtils {
private String getUserAgent(HttpServletRequest request) {
return request.getHeader("user-agent");
}
}
ユーザーエージェントの例：
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
2. Spring MVCの例
Spring MVCでは、HttpServletRequestを任意のSpring管理対象Beanに直接@Autowiredすることができます。
SiteController.java
package com.example.web.controller;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
@Controller
@RequestMapping("/site")
public class SiteController {
@Autowired
private HttpServletRequest request;
@RequestMapping(value = "/{input:.+}", method = RequestMethod.GET)
public ModelAndView getDomain(@PathVariable("input") String input) {
ModelAndView modelandView = new ModelAndView("result");
modelandView.addObject("user-agent", getUserAgent());
modelandView.addObject("headers", getHeadersInfo());
return modelandView;
}
//get user agent
private String getUserAgent() {
return request.getHeader("user-agent");
}
//get request headers
private Map getHeadersInfo() {
Map map = new HashMap();
Enumeration headerNames = request.getHeaderNames();
while (headerNames.hasMoreElements()) {
String key = (String) headerNames.nextElement();
String value = request.getHeader(key);
map.put(key, value);
}
return map;
}
}
HttpServletRequestが見つからない場合は、この依存関係をpom.xmlで宣言します。
javax.servlet servlet-api 2.5