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這是我原來的職位的延續在這裏：javascript-to-java-applet-using-deployjava-js-to-run-commandlineJavaScript以Java小程序 - 工作
我非常新到Java。我想創建一個Java Applet，它將允許我的JavaScript將命令行傳遞給Java Applet。這隻會在我的開發機器上運行 - 不需要提醒我什麼是安全問題。用例是我爲ExtJS應用程序設計了一個introspector，它允許我顯示這些類。我希望能夠點擊一個類，將相關路徑名傳遞給Applet，並在Eclipse中打開該文件進行編輯。
經過多次失敗的測試，這是我發現的作品。感謝Andrew Thompson和下面提到的其他人。
似乎有兩條路徑，我設法讓他們都工作。我把他們都包括在這裏。路徑1是用參數執行一個程序（例如D:/Eclipse/eclipse.exe --launcher.openFile C:/sites/test.js），而路徑2則是設置Win7以在打開* .js文件（即將* .js與Eclipse關聯）時打開Eclipse。
安全免責聲明：請記住，路徑1在公共服務器上完全不安全 - 通過JavaScript傳遞格式或刪除命令或任何其他惡作劇相對容易！
對於像我這樣的Java新手來說，我會盡我所能地講述這些步驟。
執行程序的類。謝謝：https://stackoverflow.com/users/80389/corgrath
package systemcmd;
import java.applet.Applet;
import java.io.*;
public class Runcmd extends Applet {
private static final long serialVersionUID = 1L;
public void init() {
// It seems that even though this command is not executed when the
// applet is run via JS we still need to refer to the exec command here,
// I presume so it is linked? If I comment these out altogether, the
// applet doesnt work. Either of the following will suffice.
// FYI. Just betraying my Java newbie status! :-)
//exec("notepad c:/sites/test.txt");
exec("calc");
}
// From https://stackoverflow.com/questions/1068271/signed-applet-gives-accesscontrolexception-access-denied-when-calling-from-jav
// Thank you !!!
public void exec(String command) {
try {
// launch EXE and grab stdin/stdout and stderr
Process process = Runtime.getRuntime().exec(getParameter("command"));
// OutputStream stdin = process.getOutputStream();
InputStream stderr = process.getErrorStream();
InputStream stdout = process.getInputStream();
// clean up if any output in stdout
String line = "";
BufferedReader brCleanUp = new BufferedReader(new InputStreamReader(stdout));
while ((line = brCleanUp.readLine()) != null) {
//System.out.println ("[Stdout] " + line);
}
brCleanUp.close();
// clean up if any output in stderr
brCleanUp = new BufferedReader(new InputStreamReader(stderr));
while ((line = brCleanUp.readLine()) != null) {
//System.out.println ("[Stderr] " + line);
}
brCleanUp.close();
} catch (Exception exception) {
exception.printStackTrace();
}
}
}
類用於運行與文件關聯程序：
package systemcmd;
import java.applet.Applet;
import java.awt.Desktop;
import java.io.*;
public class Launchapp extends Applet {
private static final long serialVersionUID = 1L;
public void init() {
// It seems that even though this command is not executed when the
// applet is run via JS we still need to refer to the exec command here,
// I presume so it is linked? If I comment these out altogether, the
// applet doesnt work. Either of the following will suffice.
// FYI. Just betraying my Java newbie status! :-)
//launch("notepad c:/sites/test.txt");
launch("calc");
}
// From https://stackoverflow.com/questions/1068271/signed-applet-gives-accesscontrolexception-access-denied-when-calling-from-jav
// Thank you !!!
public void launch(String command) {
try {
Desktop.getDesktop().open(new File(getParameter("command")));
} catch (Exception exception) {
exception.printStackTrace();
}
}
}
使用Eclipse，我出口這兩個類位於同一文件夾作爲一個jar文件名爲runcombo.jar跟隨HTML文件。然後我自己也簽署了安全問題所需的jar。我發現這個教程對這個過程很有幫助。 http://www.jade-cheng.com/uh/ta/signed-applet-tutorial/。
的HTML和JavaScript測試頁：
<html>
<head>
<script type="text/javascript">
function exec(command) {
var applet = "<object type='application/x-java-applet' height='100' width='100' name='jsApplet'><param name='code' value='systemcmd.Runcmd'/><param name='archive' value='runcombo.jar' /><param name='mayscript' value='true'/><param name='command' value='" + command + "'/>Applet failed to run. No Java plug-in was found.</object>";
var body = document.getElementsByTagName("body")[0];
var div = document.createElement("div");
div.innerHTML = applet;
body.appendChild(div);
}
function launch(command) {
var applet = "<object type='application/x-java-applet' height='100' width='100' name='jsApplet'><param name='code' value='systemcmd.Launchapp'/><param name='archive' value='runcombo.jar' /><param name='mayscript' value='true'/><param name='command' value='" + command + "'/>Applet failed to run. No Java plug-in was found.</object>";
var body = document.getElementsByTagName("body")[0];
var div = document.createElement("div");
div.innerHTML = applet;
body.appendChild(div);
}
</script>
</head>
<body>
<a href="#" onclick="exec('notepad c:/sites/test.txt');">Exec Notepad</a>
<br> <a href="#" onclick="exec('calc');">Exec Calculator</a>
<br> <a href="#" onclick="exec('D:/Eclipse/eclipse.exe --launcher.openFile C:/sites/test.js');">Exec Eclipse with command line parms</a>
<br> <a href="#" onclick="launch('C:/sites/test2.txt');">Launch Notepad via *.txt association</a>
<br> <a href="#" onclick="launch('C:/sites/test2.js');">Launch Eclipse via *.js association</a>
</body>
</html>
注意，小程序被添加到DOM當JS函數被調用。這是使用Java安全性的一部分，並避免了上述阻止applet運行的安全問題。還要注意有兩個JS函數調用來匹配不同的類。
再次感謝所有幫助我實現這一目標的人。現在我可以回到最初的目的 - 完成我的Ext Introspector！
穆雷
請注意，答案不應該成爲問題的一部分。你可能會重寫這個問題，並將其餘大部分放在答案中。 – 2013-05-01 06:38:20