可直接用于 GraalVM 打包的依赖(避免反射)
编辑
23
2024-09-14
JSON解析器
jsoniter
jsoniter(json-iterator)是一款快且灵活的 JSON 解析器。官网:http://jsoniter.com/index.cn.html
<!-- JSON 序列化 http://jsoniter.com/index.cn.html -->
<dependency>
<groupId>com.jsoniter</groupId>
<artifactId>jsoniter</artifactId>
<version>0.9.23</version>
</dependency>
命令行解析
picocli
picocli 本身也使用了反射技术,但是通过 picocli-codegen 依赖可以很轻松支持本地编译。官网:https://picocli.info
<!-- https://www.infoq.com/articles/java-native-cli-graalvm-picocli/ -->
<dependency>
<groupId>info.picocli</groupId>
<artifactId>picocli</artifactId>
<version>4.7.6</version>
</dependency>
<dependency>
<groupId>info.picocli</groupId>
<artifactId>picocli-codegen</artifactId>
<version>4.7.6</version>
</dependency>
自定义解析器
import java.io.PrintStream;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
/**
* @author YahocenMiniPC
*/
public class Command {
/**
* 单例实例
*/
private static volatile Command instance;
private final List<String> params;
private Command(String[] args) {
this.params = Arrays.stream(args).map(String::trim).toList();
}
/**
* 获取单例实例的方法。
* @param args 程序入口参数
*/
public static void initInstance(String[] args) {
if (instance == null) {
synchronized (Config.class) {
if (instance == null) {
instance = new Command(args);
}
}
}
}
public static String get(Option option) {
if (instance == null) {
throw new IllegalStateException("Command not initialized");
}
if(option == Option.HELP || option == Option.VERSION) {
return option.defaultValue;
}
Optional<Integer> paramIndex = Arrays.stream(option.names).map(k -> instance.params.indexOf(k)).filter(i -> i != -1).findFirst();
return paramIndex.map(integer -> instance.params.get(integer + 1)).orElse(option.defaultValue);
}
public static boolean contains(Option option) {
if (instance == null) {
throw new IllegalStateException("Command not initialized");
}
return Arrays.stream(option.names).anyMatch(k -> instance.params.contains(k));
}
public static boolean isHelp() {
return contains(Option.HELP);
}
public static boolean isVersion() {
return contains(Option.VERSION);
}
public static void usage(PrintStream stream) {
StringBuilder usageBuilder = new StringBuilder();
usageBuilder.append("Usage: ").append(Constant.NAME).append(" [options]\n\n");
usageBuilder.append("Options:\n");
for (Option option : Option.values()) {
StringBuilder namesBuilder = new StringBuilder();
for (int i = 0; i < option.names.length; i++) {
if (i > 0) {
namesBuilder.append(", ");
}
if (option.names[i].startsWith("-")) {
namesBuilder.append(option.names[i]);
} else {
namesBuilder.append("--").append(option.names[i]);
}
}
String names = namesBuilder.toString();
usageBuilder.append(String.format(" %s %s\n", names, option.describe));
}
stream.println(usageBuilder);
}
public static void version(PrintStream stream) {
stream.println(Option.VERSION.defaultValue);
}
public static enum Option {
/**
* 自定义参数
*/
CONF(new String[]{"-c", "--conf"}, "指定配置文件", Constant.CONFIG_PATH),
STOP(new String[]{"-s", "--stop"}, "停止服务", null),
/**
* 系统参数
*/
HELP(new String[]{"-h", "--help"}, "显示帮助信息", null),
VERSION(new String[]{"-v", "--version"}, "显示版本信息", Constant.VERSION),
;
Option(String[] names, String describe, String defaultValue) {
this.names = names;
this.describe = describe;
this.defaultValue = defaultValue;
}
final String[] names;
final String describe;
final String defaultValue;
public String get() {
return Command.get(this);
}
public boolean is() {
return Command.contains(this);
}
}
public static void main(String[] args) {
Command.initInstance(new String[]{"-v"});
if(Option.HELP.is()) {
Command.usage(System.out);
System.exit(0);
}
if(Option.VERSION.is()) {
Command.version(System.out);
System.exit(0);
}
//其他业务逻辑
}
}
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