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_posts/2015-02-22-javajs.md

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+---
+layout: post
+title: Java中用js解析json
+tags: ScriptEngineManager Java javascript
+categories: java
+published: java
+---
+
+在java中如何解析json？fastjson？jackson？那未免太无趣了
+
+其实我们可以试试ScriptEngine
+
+~~~java
+public class NashornTest {
+
+    private static String json = "[{name:'A',age:'18'},{name:'B',age:'19'},{name:'C',age:'30'}]";
+
+    private static String script =
+            "function parse(json){" +
+            "   var names = new Array();" +
+            "   for(var i in json){" +
+            "       names.push(json[i].name);" +
+            "   }" +
+            "   return names;" +
+            "};" +
+            "parse(" + json + ");";
+
+    public static void main(String[] args) throws ScriptException {
+        ScriptEngineManager manager = new ScriptEngineManager();
+        ScriptEngine engine = manager.getEngineByName( "JavaScript" );
+
+        Map<String,String> result = (Map<String,String>)engine.eval(script);
+        result.forEach((k,v) -> System.out.println(v));
+    }
+}
+~~~
+
+输出:
+
+A
+
+B
+
+C
+
+> 代码中使用了 [lambda](http://blog.rainynight.top/2014-12-13/java-newfeature/# lambda)
+