public class Client {
public static void main(String[] args) throws Exception {
//Java源代码
String sourceStr = "public class Hello{ public String sayHello (String name) {return \"Hello,\" + name + \"!\";}}";
//类名及文件名
String clsName = "Hello";
//方法名
String methodName = "sayHello";
//当前编译器
JavaCompiler cmp = ToolProvider.getSystemJavaCompiler();
//Java标准文件管理器
StandardJavaFileManager fm = cmp.getStandardFileManager(null,null,null);
//Java文件对象
JavaFileObject jfo = new StringJavaObject(clsName,sourceStr);
//编译参数，类似于javac <options>中的options
List<String> optionsList = new ArrayList<String>();
//编译文件的存放地方，注意：此处是为Eclipse工具特设的
optionsList.addAll(Arrays.asList("-d","./bin"));
//要编译的单元
List<JavaFileObject> jfos = Arrays.asList(jfo);
//设置编译环境
JavaCompiler.CompilationTask task = cmp.getTask(null, fm, null, optionsList,null,jfos);
//编译成功
if(task.call()){
//生成对象
Object obj = Class.forName(clsName).newInstance();
Class<? extends Object> cls = obj.getClass();
//调用sayHello方法
Method m = cls.getMethod(methodName, String.class);
String str = (String) m.invoke(obj, "Dynamic Compilation");
System.out.println(str);
}
}
}
//文本中的Java对象
class StringJavaObject extends SimpleJavaFileObject{
//源代码
private String content = "";
//遵循Java规范的类名及文件
public StringJavaObject(String _javaFileName,String _content){
super(_createStringJavaObjectUri(_javaFileName),Kind.SOURCE);
content = _content;
}
//产生一个URL资源路径
private static URI _createStringJavaObjectUri(String name){
//注意此处没有设置包名
return URI.create("String:///" + name + Kind.SOURCE.extension);
}
//文本文件代码
@Override
public CharSequence getCharContent(boolean ignoreEncodingErrors)
throws IOException {
return content;
}
}