在applet调用js时出现错误(已解决) -

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在applet调用js时出现错误(已解决)

博客分类：

java applet与 js交互

applet js java com/sun/deploy/appcontext/AppContext

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.JApplet;
import netscape.javascript.JSObject;

public class AppletTest extends JApplet{
    /**
*
*/
private static final long serialVersionUID = 2171316410722327511L;
public AppletTest() {
        System.out.println("AppletTest============1");
    }
    public void init() {
        System.out.println("AppletTest============2");
        new Thread(){
            public void run(){
                try{
                    while(true){
                        Thread.sleep(1000);
                        System.out.println("init=======================" + getTime());
                    }
                }
                catch(Exception e){
                    e.printStackTrace();
                }
            }
        }.start();
        String parame = "{\"success\":true,\"info\":\"加载完成\"}";
        System.out.println("加载完成=======================" + getTime());
        runJS("initFinish", parame); //调用客户端js方法的
    }
    /**
     *
     * @param json 传入的字符串数据
     * @param fun 回调的函数
     */
    public void myMethod(final String json, final String fun){
        AccessController.doPrivileged(new PrivilegedAction<Object>() {
            public Object run() {
                new Thread(){ // 另起线程，避免客户端等待applet返回数据卡死
                    public void run(){
                        try{
                            System.out.println("1Thread=======================" + getTime());
                            String parame = "{\"success\":true,\"info\":\"执行完毕\"}";
                            runJS(fun, parame); //调用客户端js方法的
                        }
                        catch(Exception e){
                            e.printStackTrace();
                        }
                    }
                }.start();
                System.out.println("2Thread=======================" + getTime());
                return null;
            }

        });
    }
    public void runJS(final String jsFun, final String parame) {
        new Thread(new Runnable() {
            public void run() {
                try {
                    String fun = "";
                    if(jsFun != null && !jsFun.equals("")){
                        fun = jsFun + "(" + parame + ")";
                        JSObject.getWindow(AppletTest.this).eval("javascript:" + fun + ";");
                    }
                } catch (Throwable e) {
                    System.out.println("调用js出错=========" + e.getMessage());
                }
            }
        }).start();
    }
    public void destroy() {
        super.destroy();
        System.out.println("================== destroy");
        System.exit(0);
    }
    public static String getTime() {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return sdf.format(new Date());
    }
}

html文件如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>

<script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.7.2.min.js"></script>
<script>
var getTime = function(formatStr, date){
        formatStr = arguments[0] || "yyyy-MM-dd HH:mm:ss";
        date = arguments[1] || new Date();
        var str = formatStr;
        var Week = ['日','一','二','三','四','五','六'];
        str=str.replace(/yyyy|YYYY/,date.getFullYear());
        str=str.replace(/yy|YY/,(date.getYear() % 100)>9?(date.getYear() % 100).toString():'0' + (date.getYear() % 100));
        str=str.replace(/MM/,date.getMonth()>9?(date.getMonth() + 1):'0' + (date.getMonth() + 1));
        str=str.replace(/M/g,date.getMonth());
        str=str.replace(/w|W/g,Week[date.getDay()]);
        str=str.replace(/dd|DD/,date.getDate()>9?date.getDate().toString():'0' + date.getDate());
        str=str.replace(/d|D/g,date.getDate());
        str=str.replace(/hh|HH/,date.getHours()>9?date.getHours().toString():'0' + date.getHours());
        str=str.replace(/h|H/g,date.getHours());
        str=str.replace(/mm/,date.getMinutes()>9?date.getMinutes().toString():'0' + date.getMinutes());
        str=str.replace(/m/g,date.getMinutes());
        str=str.replace(/ss|SS/,date.getSeconds()>9?date.getSeconds().toString():'0' + date.getSeconds());
        str=str.replace(/s|S/g,date.getSeconds());
        return str;
}
var appletObj = function(){
    this.myMethod = function(json, fun){
        try{
            this.getInstance().myMethod(json, fun);
            console.log(getTime() + "======myMethod:");
        }
        catch(e){
            console.error(getTime() + "====applet程序挂了，请刷新页面:" + e);
        }
    }
    var tool;
    this.getInstance = function(){
        console.log(getTime() + "======typeof tool:" + (typeof tool));
        console.log(getTime() + "======tool:" + tool);
        if(typeof tool == 'undefined'){
            console.log(getTime() + "======getInstance:");
            tool = $("#tool")[0];
        }
        return tool;
    }
    return this;
}();
$(function(){
    $("#btn").click(function(){
        var parame = {data1:'test1'};
        appletObj.myMethod(JSON.stringify(parame), "resultData");
    });
});

function resultData(jsonObj){
    console.log(getTime() + "========jsonObj:" + JSON.stringify(jsonObj));
    console.log(getTime() + "======btn1Click:" + jsonObj.success);
}
function initFinish(jsonObj){
    console.log(getTime() + "========applet init end:" + jsonObj.info);
}
</script>
</head>
<body>
<applet id="tool" code="AppletTest" codebase="." archive="AppletTest.jar" width="0" height="0" >
</applet>

<input type="button" id="btn" value="调用applet" />
</body>
</html>

/*
在applet调用js时出现错误
java.lang.NoClassDefFoundError: com/sun/deploy/appcontext/AppContext
    at fxApplet.pringString(fxApplet.java:33)
    at fxApplet.init(fxApplet.java:21)
    at sun.applet.AppletPanel.run(AppletPanel.java:424)
    at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: com.sun.deploy.appcontext.AppContext
    at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    ... 4 more

*/

解决办法，在jdk或者jre下面找到jar: deploy.jar,引入到项目下面就可以了。如果没有这个jar，建议你重新下载一个jre或者jdk.

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