Java内容重新整理删除过期的东西

Java/JavaDemo/codedemo/script/ScriptRunPerformence.java

@@ -0,0 +1,112 @@
+package cn.aofeng.demo.script;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.script.Bindings;
+import javax.script.Compilable;
+import javax.script.CompiledScript;
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+import javax.script.ScriptException;
+
+/**
+ * 脚本语言运行性能测试：
+ * <pre>
+ * 1、每次运行脚本都解释的执行性能。
+ * 2、编译脚本后再运行的性能。
+ * </pre>
+ * 
+ * @author 聂勇 <aofengblog@163.com>
+ */
+public class ScriptRunPerformence {
+
+    private final static int COUNT = 100000;
+    
+    /**
+     * 每次解释脚本并运行<code>COUNT</code>次。
+     * 
+     * @param script 脚本表达式
+     * @param vars 用于替换<code>script</code>中变量的Key=>Value集合
+     * @throws ScriptException 如果解释或运行脚本出错
+     */
+    public void parse(String script, Map<String, Object> vars) throws ScriptException {
+        ScriptEngine scriptEngine = getScriptEngine("javascript");
+        long startTime = System.currentTimeMillis();
+        for (int i = 0; i < COUNT; i++) {
+            Bindings binds = createBinding(vars, scriptEngine);
+            scriptEngine.eval(script, binds);
+        }
+        long usedTime = System.currentTimeMillis() - startTime;
+        System.out.println( String.format("每次都解释脚本执行%d次消耗%d毫秒", COUNT, usedTime) );
+    }
+    
+    /**
+     * 编译脚本后运行<code>COUNT</code>次。
+     * 
+     * @param script 脚本表达式
+     * @param vars 用于替换<code>script</code>中变量的Key=>Value集合
+     * @throws ScriptException 如果编译或运行脚本出错
+     */
+    public void compile(String script, Map<String, Object> vars) throws ScriptException {
+        ScriptEngine scriptEngine = getScriptEngine("javascript");
+        Compilable compileEngine = (Compilable) scriptEngine;
+        CompiledScript compileScript = compileEngine.compile(script);
+        long startTime = System.currentTimeMillis();
+        for (int i = 0; i < COUNT; i++) {
+            Bindings binds = createBinding(vars, scriptEngine);
+            compileScript.eval(binds);
+        }
+        long usedTime = System.currentTimeMillis() - startTime;
+        System.out.println( String.format("编译脚本后执行%d次消耗%d毫秒", COUNT, usedTime) );
+    }
+    
+    private ScriptEngine getScriptEngine(String name) {
+        ScriptEngineManager sem = new ScriptEngineManager();
+        return sem.getEngineByName(name);
+    }
+    
+    private Bindings createBinding(Map<String, Object> vars,
+            ScriptEngine scriptEngine) {
+        Bindings binds = scriptEngine.createBindings();
+        if (null != vars && !vars.isEmpty()) {
+            binds.putAll(vars);
+        }
+        
+        return binds;
+    }
+    
+    public static void main(String[] args) throws ScriptException {
+        if ( args.length != 1) {
+            System.err.println("参数错误。使用示例：\n    java cn.aofeng.demo.script.ScriptRunPerformence [parse|compile]");
+            System.exit(-1);
+        }
+        String runType = args[0];
+        if ( !"parse".equals(runType) && !"compile".equals(runType) ) {
+            System.err.println("参数错误。使用示例：\n    java cn.aofeng.demo.script.ScriptRunPerformence [parse|compile]");
+            System.exit(-1);
+        }
+        
+        String script = "function run(a, b) {" +
+        		"var c = a + b;" +
+        		"var d = a * b;" +
+        		"var e = a / b;" +
+        		"var f = a % b;" +
+        		"var g = a - b;" +
+        		"var  express = ((a * 5) > b || b * 10 >= 100) && (a * b > 99);" +
+        		"}" +
+        		"" +
+        		"run(x, y);";
+        Map<String, Object> vars = new HashMap<String, Object>(2);
+        vars.put("x", 20);
+        vars.put("y", 9);
+        
+        ScriptRunPerformence srp = new ScriptRunPerformence();
+        if ("parse".equals(runType)) {
+            srp.parse(script, vars);
+        } else {
+            srp.compile(script, vars);
+        }
+    }
+
+}