java中执行JS脚本

package 测试包;
import javax.script.*;
public class SSSSSSSSS {

    public SSSSSSSSS() {
        // TODO Auto-generated constructor stub
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
ScriptEngineManager sem=new ScriptEngineManager();
ScriptEngine se=sem.getEngineByName("javascript");
try{se.eval("var a=3;var b=4;print(a+b)");  //执行js代码
    
    
}catch(Exception e){e.printStackTrace();}

        
        
    }

}

补充：今天在后台想对URL进行编码，URL中有参数

        String url = "http://www.baidu.com?param=中国";
        System.out.println(URLEncoder.encode(url));

结果: (对一些特殊字符，比如// ？ & 也进行转义)

http%3A%2F%2Fwww.baidu.com%3Fparam%3D%E4%B8%AD%E5%9B%BD

于是想到在Java中调用JS的encodeURI()方法:

package cn.xm.exam.test;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class PlainTest {
    private static final Logger LOGGER = LoggerFactory.getLogger(PlainTest.class);

    public static void main(String[] args) {
        String url = "http://www.baidu.com?param=中国";
        System.out.println(encodeURI(url));
    }

    public static String encodeURI(String url) {
        if ("".equals(url)) {
            return "";
        }
        ScriptEngineManager sem = new ScriptEngineManager();
        ScriptEngine se = sem.getEngineByName("javascript");
        String jsCommand = "encodeURI('" + url + "');";
        LOGGER.debug("jsCommand -> {}", jsCommand);
        try {
            String result = (String) se.eval(jsCommand); // 执行js代码
            return result;
        } catch (Exception e) {
            LOGGER.error("encodeURI error,jsCommand ->{}", jsCommand, e);
            return "";
        }
    }
}

结果:

http://www.baidu.com?param=%E4%B8%AD%E5%9B%BD