Java SecurityManager checkAccept（）方法与示例

SecurityManager类的checkAccept()方法 (SecurityManager Class checkAccept() method)

• checkAccept() method is available in java.lang package.

  checkAccept()方法在java.lang包中可用。

• checkAccept() method of ServerSocket class is called for the current security manager and it calls checkPermission with the SocketPermission(host_add+":"+port_no,"accept").

  当前安全管理器将调用ServerSocket类的checkAccept()方法 ，并使用SocketPermission(host_add +“：” + port_no，“ accept”)调用checkPermission。

• checkAccept() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  checkAccept()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• checkAccept() method may throw an exception at the time of establishing a server connection.

  建立服务器连接时， checkAccept()方法可能会引发异常。

  • SecurityException – This exception may throw when the calling thread is not allowed to accept the connection.
  • NullPointerException – This exception may throw when the given first parameter is null.

Syntax:

句法：

    public void checkAccept(String host_add, int port_no);

Parameter(s):

参数：

• String host_add – represents the hostname of the socket connection.

  字符串host_add –表示套接字连接的主机名。

• int port_no – represents the port number of the socket connection.

  int port_no –表示套接字连接的端口号。

Return value:

返回值：

The return type of this method is void, it returns nothing.

此方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example 
// of void checkAccept(String host_add, int port_no)
// method of SecurityManager 

public class CheckAccept {
     
    public static void main(String[] args) {
     
        String host_add = "www.includehelp.com";
        int port_no = 8080;

        // By using setProperty() method is to set the policy property 
        // with security manager
        System.setProperty("java.security.policy", "file:/C:/java.policy");

        // Instantiating a SecurityManager object
        SecurityManager smgr = new SecurityManager();

        // By using setSecurityManager() method is to set the
        // security manager
        System.setSecurityManager(smgr);

        // By using checkAccept() method is to check that
        // socket connection is enabled or not
        smgr.checkAccept(host_add, port_no);

        // Display the message when connection is enabled
        System.out.println("Accepted..");
    }
}

Output

输出量

Exception in thread "main" java.security.AccessControlException: access denied ("java.net.SocketPermission" "www.includehelp.com:8080" "accept,resolve")
	at java.base/java.security.AccessControlContext.checkPermission(AccessControlContext.java:472)
	at java.base/java.security.AccessController.checkPermission(AccessController.java:897)
	at java.base/java.lang.SecurityManager.checkPermission(SecurityManager.java:322)
	at java.base/java.lang.SecurityManager.checkAccept(SecurityManager.java:940)
	at CheckAccept.main(CheckAccept.java:23)

翻译自: https://www.includehelp.com/java/securitymanager-checkaccept-method-with-example.aspx