java调用javascript实例

/*
* JSExploration.java
* @author Lucky
* Created on November 4, 2008, 11:16 AM
*/

package com.pengzhoushuo.js;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.util.Properties;

import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.Scriptable;

/**
* this class provide a way for java class to call java script code<p>
*
*/
public class JSExploration {

private Context cx;

private Scriptable scope;

public JSExploration() {
this.cx = Context.enter();
this.scope = cx.initStandardObjects();
}

public Object runJavaScript(String filename) {
String jsContent = this.getJsContent(filename);
Object result = cx.evaluateString(scope, jsContent, filename, 1, null);
return result;
}

private String getJsContent(String filename) {
LineNumberReader reader = null;
InputStream is = null;
try {
is = this.getClass().getClassLoader().getResourceAsStream(filename);
reader = new LineNumberReader(new InputStreamReader(is));
String s = null;
StringBuffer sb = new StringBuffer();
while ((s = reader.readLine()) != null) {
sb.append(s).append("\n");
}
return sb.toString();
} catch (Exception e) {
// TODO Auto-generated catch block
//e.printStackTrace();
return null;
}finally{
if(reader != null)
try {
reader.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(is != null)
try {
is.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

public Scriptable getScope() {
return scope;
}

/**
* 调用JAVASCRIPT对密码进行加??
* @param key 密码明文
* @return 密码密文
*/
public static String getKey(String key) {
//javacript file path
String filename = "com/pengzhoushuo/js/RSAKey.js";
JSExploration jsExploration = new JSExploration();
Object result = jsExploration.runJavaScript(filename);
Scriptable scope = jsExploration.getScope();

//getKey是javascript中对应的方法名
Function sum = (Function) scope.get("getKey", scope);
Object isPrime = sum.call(Context.getCurrentContext(), scope, sum, new Object[] {key});
return Context.toString(isPrime);

}

public static void main(String[] args){
System.out.println(JSExploration.getKey("a1234567"));
}
}