Java6的新特性

发布时间:2019-11-17 发布网站:脚本宝典
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Java语言特性系列

本文梳理了下java6的新特性,相对于java5而言,java6的特性显得少些,分量也不那么重,相当于java5是windows xp,java6有点像vista。

特性列表

  • JSR223脚本引擎
  • JSR199--Java Compiler API
  • JSR269--Pluggable Annotation PRocessing API
  • 支持JDBC4.0规范
  • JAX-WS 2.0规范

1、JSR223脚本引擎

Scripting for the Java Platform

  • 基本使用
public class BasicScripting {     public void greet() throws ScriptException {         ScriptEngineManager manager = new ScriptEngineManager();         //支持通过名称、文件扩展名、MIMEtyPE查找         ScriptEngine engine = manager.getEngineByName("JavaScript"); //        engine = manager.getEngineByExtension("js"); //        engine = manager.getEngineByMimeType("text/javascript");         if (engine == null) {             throw new RuntimeException("找不到JavaScript语言执行引擎。");         }         engine.eval("println('Hello!');");     }     public static void main(String[] args) {         try {             new BasicScripting().greet();         } catch (ScriptException ex) {             LOGger.getLogger(BasicScripting.class.getName()).log(Level.SEVERE, null, ex);         }     } }
  • 绑定上下文
public class ScriptContextBindings extends JsScriptRunner {     public void scriptContextBindings() throws ScriptException {         ScriptEngine engine = getJavaScriptEngine();         ScriptContext context = engine.getContext();         Bindings bindings1 = engine.createBindings();         bindings1.put("name", "Alex");         context.setBindings(bindings1, ScriptContext.GLOBAL_SCOPE);         Bindings bindings2 = engine.createBindings();         bindings2.put("name", "Bob");         context.setBindings(bindings2, ScriptContext.ENGINE_SCOPE);         engine.eval("println(name);");     }     public void useScriptContextValues() throws ScriptException {         ScriptEngine engine = getJavaScriptEngine();         ScriptContext context = engine.getContext();         Bindings bindings = context.getBindings(ScriptContext.ENGINE_SCOPE);         bindings.put("name", "Alex");         engine.eval("println(name);");     }     public void attributeinBindings() throws ScriptException {         ScriptEngine engine = getJavaScriptEngine();         ScriptContext context = engine.getContext();         context.setattribute("name", "Alex", ScriptContext.GLOBAL_SCOPE);         engine.eval("println(name);");     }     /**      * @param args the command line arguments      */     public static void main(String[] args) throws ScriptException {         ScriptContextBindings scb = new ScriptContextBindings();         scb.scriptContextBindings();         scb.useScriptContextValues();         scb.attributeInBindings();     } }

2、JSR199--Java Compiler API

public class JavaCompilerAPICompiler {     public void compile(Path src, Path output) throws IOException {         JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();         try (StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null)) {             Iterable<? extends JavaFileObject> compilationUnits = fileManager.getJavaFileObjects(src.toFile());             Iterable<String> options = Arrays.asList("-d", output.toString());             JavaCompiler.CompilationTask task = compiler.getTask(null, fileManager, null, options, null, compilationUnits);             boolean result = task.call();         }     } }

3、JSR269--Pluggable Annotation Processing API

一部分是进行注解处理的javax.annotation.processing,另一部分是对程序的静态结构进行建模的javax.lang.model

4、其他

  • 支持JDBC4.0规范
  • JAX-WS 2.0规范(包括JAXB 2.0)
  • 轻量级HttpServer

参考

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