如何在Java中设置HttpOnly Cookie？

Httponly cookie 是一种 cookie 安全解决方案。

在支持httponly cookie的浏览器（IE6+、FF3.0+）中，如果cookie中设置了“httponly”属性，则JavaScript脚本将无法读取cookie信息，可以有效防止XSS攻击，让网站应用更安全。

但是J2EE4、J2EE5 cookie不提供设置httponly属性的方法，所以如果需要设置httponly属性需要自己处理。

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已经设置了httponly，所以如果兼容Java EE 6.0兼容的容器（例如Tomcat 7），可以使用cookie.sethttponly设置HTTPONLY：

cookie.setHttpOnly(true);

Java HttpCookie 类的setHttpOnly(Boolean httpOnly) 方法用于指示cookie 是否可以被认为是HTTPOnly。如果设置为 true，则 cookie 不能被 JavaScript 等脚本引擎访问。

句法

public void setHttpOnly(boolean httpOnly)

范围

上述方法只需要一个参数：

httpOnly - 如果 cookie 仅是 HTTP，则表示 true，这意味着它作为 HTTP 请求的一部分可见。

返回

不适用

示例 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());
     }
 }

输出：

Check whether the cookie is HTTPOnly: true

示例 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());
   }
}

输出：

Check whether the cookie is HTTPOnly: false

示例 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());
       }
    }

输出：

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

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