從零碼起調(diào)用javascript
Java語(yǔ)言作為靜態(tài)面向?qū)ο缶幊陶Z(yǔ)言的代表，極好地實(shí)現(xiàn)了面向?qū)ο罄碚摚试S程序員以優(yōu)雅的思維方式進(jìn)行復(fù)雜的編程。以下是小編為大家搜索整理的從零碼起調(diào)用javascript，希望能給大家?guī)?lái)幫助!更多精彩內(nèi)容請(qǐng)及時(shí)關(guān)注我們應(yīng)屆畢業(yè)生考試網(wǎng)!
package co.test;
import java.io.FileReader;
import java.io.LineNumberReader;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.Scriptable;
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;
try
{
reader = new LineNumberReader(new FileReader(filename));
String s = null;
StringBuffer sb = new StringBuffer();
while ((s = reader.readLine()) != null)
{
sb.append(s).append("\n");
}
return sb.toString();
}
catch (Exception e)
{
/pic/p>
e.printStackTrace();
return null;
}
}
public Scriptable getScope()
{
return scope;
}
public static void main(String[] args)
{
String filename = System.getProperty("user.dir") + "/jsmap.js";
JSExploration jsExploration = new JSExploration();
Object result = jsExploration.runJavaScript(filename);
Scriptable scope = jsExploration.getScope();
Function sum = (Function) scope.get("sum", scope);
Function isPrime = (Function)sum.call(Context.getCurrentContext(), scope, sum, new Object[] {2,8});
Object ss = isPrime.call(Context.getCurrentContext(), sum, isPrime, new Object[] {2,8});
System.out.println(Context.toString(ss));
}
}
試驗(yàn)了一個(gè)java 調(diào)用 javascript 的例子，如果把jsmap.js中的與this 有關(guān)的代碼注銷的話程序就可以正常運(yùn)行。不住銷掉的話就會(huì)報(bào)個(gè)運(yùn)行時(shí)錯(cuò)誤。。。
js 代碼如下(有關(guān)this 的代碼已注銷)：
function sum(x, y) {
/pic/p>
/pic/p>
/pic/2;
/pic/p>
var vager = 1000;
return function (x,y){return x + y + vager;} ;
}
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