Java JNDI application cases: Explore the flexible application of Java JNDI in real scenarios

Java JNDI (Java Naming and Directory Interface) is an API in Java used to access naming and directory services. In actual development, Java JNDI has a wide range of application scenarios and can help developers achieve various flexible application requirements. This article will explore the flexible application of Java JNDI in real scenarios by introducing an actual Java JNDI application case. Through this case, readers can have a deeper understanding of the actual application and operation methods of Java JNDI. Let us explore the wonderful applications of Java JNDI in actual development!

1. Access LDAP using JNDI

LDAP is a lightweight directory access protocol, which is a standard protocol for accessing directory services. LDAP can be used to store a variety of data, such as users, groups, computers, and printers.

import javax.naming.*;
import javax.naming.ldap.*;

public class LdapExample {

public static void main(String[] args) {
try {
// 创建一个 LDAP 上下文
LdapContext ctx = new InitialLdapContext();

// 搜索 LDAP 目录
NamingEnumeration<SearchResult> results = ctx.search("dc=example,dc=com", "(objectclass=person)", null);

// 遍历搜索结果
while (results.hasMore()) {
SearchResult result = results.next();

// 获取用户名称
String username = result.getNameInNamespace();

// 获取用户属性
Attributes attrs = result.getAttributes();
String firstName = attrs.get("givenName").get().toString();
String lastName = attrs.get("sn").get().toString();

// 输出用户信息
System.out.println("用户名：" + username);
System.out.println("名：" + firstName);
System.out.println("姓：" + lastName);
}

// 关闭 LDAP 上下文
ctx.close();
} catch (NamingException e) {
e.printStackTrace();
}
}
}

2. Use JNDI to access DNS

DNS is a Domain Name System, a system for resolving domain names into IP addresses. DNS can be used to resolve a variety of domain names, such as www.example.com, mail.example.com, and ftp.example.com.

import javax.naming.directory.*;

public class DnsExample {

public static void main(String[] args) {
try {
// 创建一个 DNS 上下文
DirContext ctx = new InitialDirContext();

// 查询 DNS 记录
Attributes attrs = ctx.getAttributes("www.example.com", new String[] { "A" });

// 获取 IP 地址
String[] ips = attrs.get("A").get().toString().split(" ");

// 输出 IP 地址
for (String ip : ips) {
System.out.println("IP 地址：" + ip);
}

// 关闭 DNS 上下文
ctx.close();
} catch (NamingException e) {
e.printStackTrace();
}
}
}

3. Use JNDI to access RMI

RMI is a remote method invocation, which is a protocol for calling remote methods in distributed systems. RMI can be used to call a variety of remote methods, such as getting user names, getting user attributes, and updating user attributes.

import java.rmi.*;
import java.rmi.reGIStry.*;

public class RmiExample {

public static void main(String[] args) {
try {
// 创建一个 RMI 注册表
Registry registry = LocateRegistry.getRegistry("localhost", 1099);

// 获取远程对象
HelloService helloService = (HelloService) registry.lookup("HelloService");

// 调用远程方法
String result = helloService.sayHello("World");

// 输出结果
System.out.println(result);
} catch (RemoteException e) {
e.printStackTrace();
} catch (NotBoundException e) {
e.printStackTrace();
}
}
}

4. Use JNDI to access CORBA

CORBA is a Common Object Request Broker, a protocol for invoking remote methods in distributed systems. CORBA can be used to call various remote methods, such as getting user name, getting user

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