java 中的 java.net.NetPermission 类
原文:https://www . geesforgeks . org/Java-net-net permission-class-in-Java/
网络权限类用于允许网络权限。NetPermission 类扩展了 BasicPermission 类。这是一个“命名”权限，即它包含一个名称，但不包含任何操作。
| Permission name | What permissions allow? | Risks associated with this permission | | --- | --- | --- | | allowHttpTrace | This permission allows the HttpTrace method to be used in HttpURLConnection | Attackers may use HTTP TRACE to access security in HTTP headers. | | getCookieHandler | A cookie handler and get access to highly secure cookie information. | | Get network information | This permission allows you to get the information of the local network interface. | Attackers may gain information about local hardware. | | Get proxy selector | This permission allows the proxy selector to select the proxy to use when making a network connection. | The attacker may obtain the proxy selector and the information of the proxy host and port of the internal network [T45 | getResponseCache | This permission allows access to the local response cache. | Attackers can access local caches that may contain security information. | | 请求密码验证 | This right grants the ability to request a password from the verifier. | Attackers can steal the password. | | setCookieHandler | This permission allows a cookie handler to get highly secure cookie information. | | 设置默认验证者 | This allows the verifier to be set. | Attackers can set up verifiers and obtain security information. | | Set proxy selector | This permission allows the proxy selector to set which proxies to use when connecting to the network. | Attackers can set proxy selectors and get information about setResponseCache. | This permission allows setting the local response cache. | Attackers can access local caches that may contain security information. | | 指定 StreamHandler | This permission allows you to specify a StreamHandler to create a URL. | Attackers can create URLs and access resources that they normally cannot access. |语法:类声明
public final class NetPermission
extends BasicPermission
该类的构造函数
| Constructor | describe | | --- | --- | | NetPermission (string name) | Used to create a new NetPermission object with the given name. | | NetPermission (string name, string action) | Used to create a new NetPermission object with the given name and action. |从 java.security.BasicPermission 类继承的方法
| 方法 | 描述 | | --- | --- | | 等于(对象对象) | 检查两个基本权限对象是否相等 | | 函数() | 以字符串格式返回操作 | | hashCode() | 返回此对象的哈希值 | | 暗示(许可权限) | 检查该对象是否暗示了给定的权限 | | newPermissionCollection() | 返回新的权限集合对象 |方法继承自 java.security.Permission 类
| way | describe | | --- | --- | | checkGuard() | Used to implement Guard interface | | 获取名（） | Returns the name of this permission object. | | toString() | Returns the string representation of this permission object. |例 1:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to Create a New allow HttpTrace Permission
// Importing required network permission classes
import java.net.NetPermission;
import java.security.Permission;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Try block to check for exceptions
try {
// Creating a new allowHttpTrace permission
Permission permission
= new NetPermission("allowHttpTrace");
// Printing the name of the permission using
// getName() method
System.out.println(permission.getName());
// Printing the class of the permission using
// getClass method
System.out.println(permission.getClass());
// Printing the hash value of this permission
// object using hashCode() method
System.out.println(permission.hashCode());
}
// Catch block to handle the exceptions
catch (Exception e) {
// Print the line number where the exception occurred
e.printStackTrace();
}
}
}
输出:
allowHttpTrace
class java.net.NetPermission
303901780
例 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to Create a New getCookieHandler Permission
// Importing required network permission classes
import java.net.NetPermission;
import java.security.Permission;
// Main Class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Try block to check for exceptions
try {
// Creating a new getCookieHandler permission
Permission permission
= new NetPermission("getCookieHandler");
// Printing the name of the permission using
// getName() method
System.out.println(permission.getName());
// Printing the class of the permission using
// getClass method
System.out.println(permission.getClass());
// Printing the hash value of this permission
// object using hashCode() method
System.out.println(permission.hashCode());
}
// Catch block to handle the exceptions
catch (Exception e) {
// Print the line number where exception occured
// using printStackTrace() method
e.printStackTrace();
}
}
}
输出:
getCookieHandler
class java.net.NetPermission
1381623952
例 3:
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to Illustrate the Working of equals() Method
// Importing permission classes for networking
import java.net.NetPermission;
import java.security.Permission;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Try block to check for exceptions
try {
// Creating a new getNetworkInformation
// permission
Permission Permission1 = new NetPermission(
"getNetworkInformation");
// Creating a new getProxySelector permission
Permission Permission2
= new NetPermission("getProxySelector");
// Checking if both the given permissions are
// equal or not using equals() method
if (Permission1.equals(Permission2)) {
// Print statement
System.out.println(
"Both permission are equal");
}
// Statements differ
else {
// Print statement
System.out.println(
"Both permission are not equal");
}
}
// Catch block to handle the exceptions
catch (Exception e) {
// Print the line number where the exception occurred
e.printStackTrace();
}
}
}
输出:
Both permission are not equal
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