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Java语言特性系列
序
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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