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Compiling with the Java Compiler API
µ÷ÓÃJava±àÒëÆ÷API±àÒëJava
´ÓµÚÒ»Ì쿪ʼ,±ê×¼Javaƽ̨¾ÍȱÉÙÄܹ»±»µ÷ÓÃ,È¥²úÉúJava×Ö½ÚÂëµÄ±àÒëÆ÷½Ó¿Ú. ʹÓÃSunʵÏֵį½Ì¨,Ò»¸öÓû§¿ÉÒÔͨ¹ý·Ç±ê×¼µÄ com.sun.tools.javac °üÖеÄMain class È¥±àÒëÄãµÄ´úÂë (Äã¿ÉÒÔÔÚlib×ÓĿ¼Ï嵀 tools.jar ÎļþÀïÕÒµ½Ëü). È»¶øÕâ¸ö°ü²¢Ã»ÓÐÌṩһ¸ö±ê×¼µÄ¹«¿ªµÄ±à³Ì½Ó¿Ú. ʹÓÃÆäËüʵÏÖµÄÓû§±ØÈ»²»ÄÜ·ÃÎÊÕâ¸öÀà. ʹÓÃJava SE 6ºÍÔÚJSR-199Öж¨ÒåµÄËüµÄеÄJava±àÒëÆ÷½Ó¿Ú,Äã¿ÉÒÔ´ÓÄã×Ô¼ºµÄÓ¦ÓóÌÐòÀï·ÃÎÊjavac±àÒ빤¾ßÁË.
ÓÐÁ½ÖÖ·½Ê½Ê¹ÓÃÕâÖÖ¹¤¾ß. Ò»ÖÖÊǼòµ¥µÄ,Ò»ÖÖÊÇÉÔ΢¸´Ôӵ㵫ӵÓиü¶àÑ¡ÏîµÄ. ÄãÊ×ÏȽ«»áÓýϼòµ¥µÄÒ»ÖÖÈ¥±àÒë "Hello, World"³ÌÐò,¾ÍÊÇÏÂÃæµÄÕâ¸ö:
public class Hello {
public static void main(String args[]) {
System.out.println("Hello, World");
}
}
ÒªÏë´ÓJava³ÌÐòÀïµ÷ÓÃJava±àÒëÆ÷,ÄãÐèÒª·ÃÎÊJavaCompiler ½Ó¿Ú. ³ý´ËÍâ,ͨ¹ý·ÃÎÊÕâ¸ö½Ó¿Ú,Äã¿ÉÒÔÉèÖÃÔ´´úÂëµÄ·¾¶,classpath,ºÍÄ¿±êĿ¼. ͨ¹ýÖ¸¶¨¿É±àÒëµÄÎļþΪ JavaFileObjectinstance ,Äã¿ÉÒÔ½«ËüÃÇÈ«²¿±àÒë. È»¶ø,Äã²¢²»ÐèÒª¶Ô JavaFileObject Á˽â¶àÉÙ.
¿ÉÒÔʹÓà ToolProvider ÀàÈ¥ÇëÇó theJavaCompiler ½Ó¿ÚµÄȱʡʵÏÖ. Õâ¸ö ToolProvider ÀàÌṩÁËÒ»¸ö getSystemJavaCompiler() ·½·¨, Ëü·µ»ØÒ»¸ö JavaCompiler ½Ó¿ÚµÄʵÀý.
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
ʹÓà JavaCompiler ÔËÐбàÒë×î¼òµ¥µÄ·½·¨Êǵ÷ÓÃÔÚÕâ¸ö½Ó¿Ú¹¤¾ßÀﶨÒåµÄ run() ·½·¨,ËüµÄʵÏÖÊÇ:
int run(InputStream in,
OutputStream out,
OutputStream err,
String... arguments)
·Ö±ðΪǰÈý¸öȱʡ²ÎÊý System.in, System.out, and System.err ´«Èë null Öµ. ²ÎÊý¼¯ String ¶ÔÏó±íʾ×Å´«Èë±àÒëÆ÷µÄÎļþµÄÃû³Æ.
ÕâÑù,ÄãÓ¦¸ÃÏñÏÂÃæÕâÑùÈ¥±àÒëÇ°ÃæÏÔʾµÄ Hello Ô´³ÌÐò:
int results = tool.run(null, null, null, "Hello.java");
¼ÙÉèûÓбàÒë´íÎó,ÕâÑù»áÔÚÄ¿±êĿ¼Àï²úÉúÒ»¸ö Hello.classÎļþ. Èç¹ûÕâÀïÓдíÎó, run() ·½·¨»á°ÑËüÊä³öµ
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public static void main(String [] args)
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private String smtpPassword;
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