如何在Java中設定HttpOnly Cookie？

Httponly cookie 是一種 cookie 安全解決方案。

在支援httponly cookie的瀏覽器（IE6 、FF3.0 ）中，如果cookie中設定了「httponly」屬性，則JavaScript腳本將無法讀取cookie訊息，可以有效防止XSS攻擊，讓網站應用更安全。

但是J2EE4、J2EE5 cookie不提供設定httponly屬性的方法，所以如果需要設定httponly屬性需要自己處理。

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
 
/**
 * Cookie Tools
 */
public class CookieUtil {
 
    /**
           * Set httponly cookie
     * @param  Response HTTP response
     * @param  Cookie cookie object
     * @param  Ishttponly is httponly
     */
    public static void addCookie(HttpServletResponse response, Cookie cookie, boolean isHttpOnly) {
        String name = cookie.getName();//Cookie name
        String value = cookie.getValue();//Cookie value
        int maxAge = cookie.getMaxAge();//Maximum survival time (milliseconds, 0 representative deletion, -1 represents the same as the browser session)
        String path = cookie.getPath();//path
        String domain = cookie.getDomain();//area
        boolean isSecure = cookie.getSecure();//Is there a security protocol? 
 
        StringBuilder buffer = new StringBuilder();
 
        buffer.append(name).append("=").append(value).append(";");
 
        if (maxAge == 0) {
            buffer.append("Expires=Thu Jan 01 08:00:00 CST 1970;");
        } else if (maxAge > 0) {
            buffer.append("Max-Age=").append(maxAge).append(";");
        }
 
        if (domain != null) {
            buffer.append("domain=").append(domain).append(";");
        }
 
        if (path != null) {
            buffer.append("path=").append(path).append(";");
        }
 
        if (isSecure) {
            buffer.append("secure;");
        }
 
        if (isHttpOnly) {
            buffer.append("HTTPOnly;");
        }
 
        response.addHeader("Set-Cookie", buffer.toString());
    }
 
}

值得一提的是，Java Ee 6.0中的cookie已經設定了httponly，所以如果相容Java EE 6.0相容的容器（例如Tomcat 7），可以使用cookie.sethttponly設定HTTPONLY：

cookie.setHttpOnly(true);

Java HttpCookie 類別的setHttpOnly(Boolean httpOnly) 方法用來指示cookie 是否可以被認為是HTTPOnly。如果設定為 true，則 cookie 不能被 JavaScript 等腳本引擎存取。

句法

public void setHttpOnly(boolean httpOnly)

範圍

上述方法只需要一個參數：

httpOnly - 如果cookie 僅是HTTP，則表示true，這表示它作為HTTP 請求的一部分可見。

返回

不適用

範例1

import java.net.HttpCookie;  
public class JavaHttpCookieSetHttpOnlyExample1 {  
  public static void main(String[] args) {  
    HttpCookie  cookie = new HttpCookie("Student", "1");  
    // Indicate whether the cookie can be considered as HTTP Only or not.  
        cookie.setHttpOnly(true);  
    // Return true if the cookie is considered as HTTPOnly.  
System.out.println("Check whether the cookie is HTTPOnly: "+cookie.isHttpOnly());  
     }  
 }

#輸出：

Check whether the cookie is HTTPOnly: true

範例2

import java.net.HttpCookie;  
public class JavaHttpCookieSetHttpOnlyExample2 {  
    public static void main(String[] args) {  
        HttpCookie  cookie = new HttpCookie("Student", "1");  
        // Indicate whether the cookie can be considered as HTTP Only or not.  
            cookie.setHttpOnly(false);  
        // Return false if the cookie is not considered as HTTPOnly.  
    System.out.println("Check whether the cookie is HTTPOnly: "+cookie.isHttpOnly());  
   }  
}

輸出：

Check whether the cookie is HTTPOnly: false

範例3

import java.net.HttpCookie;  
public class JavaHttpCookieSetHttpOnlyExample3 {  
    public static void main(String[] args) {  
        HttpCookie cookie1 = new HttpCookie("Student1", "1");  
        HttpCookie cookie2 = new HttpCookie("Student2", "2");  
        //Indicate whether the cookie can be considered as HTTP Only or not.  
        cookie1.setHttpOnly(true);  
        cookie2.setHttpOnly(false);  
        System.out.println("Check whether the first cookie is HTTPOnly:"+cookie1.isHttpOnly());  
        System.out.println("Check whether the second cookie is HTTPOnly:"+cookie2.isHttpOnly());  
       }  
    }

輸出：

Check whether the first cookie is HTTPOnly:true
Check whether the second cookie is HTTPOnly:false

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