Java/JDK 6/Java Compiler tools
Содержание
Compile a Java code
<source lang="java">
import java.io.IOException; import javax.tools.JavaCompiler; import javax.tools.ToolProvider; public class JDK6FirstCompile {
public static void main(String args[]) throws IOException {
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
int results = compiler.run(null, null, null, "Foo.java");
System.out.println("Success: " + (results == 0));
}
} // File: MyClass.java class MyClass {
public static void main(String args[]) {
System.out.println("Hello, World");
}
}
</source>
Compile a Java file with JavaCompiler
<source lang="java">
import java.io.IOException; import java.util.Arrays; import javax.tools.DiagnosticCollector; import javax.tools.JavaCompiler; import javax.tools.JavaFileObject; import javax.tools.StandardJavaFileManager; import javax.tools.ToolProvider; public class DiagnosticCollectorCompile {
public static void main(String args[]) throws IOException {
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<JavaFileObject>();
StandardJavaFileManager fileManager = compiler.getStandardFileManager(diagnostics, null, null);
Iterable<? extends JavaFileObject> compilationUnits = fileManager
.getJavaFileObjectsFromStrings(Arrays.asList("Foo.java"));
JavaCompiler.rupilationTask task = compiler.getTask(null, fileManager, diagnostics, null,
null, compilationUnits);
boolean success = task.call();
fileManager.close();
System.out.println("Success: " + success);
}
} // File: MyClass.java class MyClass {
public static void main(String args[]) {
System.out.println("Hello, World");
}
}
</source>
Compiling from Memory
<source lang="java">
import java.io.IOException; import java.io.PrintWriter; import java.io.StringWriter; import java.lang.reflect.InvocationTargetException; import java.net.URI; import java.util.Arrays; import javax.tools.Diagnostic; import javax.tools.DiagnosticCollector; import javax.tools.JavaCompiler; import javax.tools.JavaFileObject; import javax.tools.SimpleJavaFileObject; import javax.tools.ToolProvider; import javax.tools.JavaCompiler.rupilationTask; import javax.tools.JavaFileObject.Kind; public class CompileSourceInMemory {
public static void main(String args[]) throws IOException {
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<JavaFileObject>();
StringWriter writer = new StringWriter();
PrintWriter out = new PrintWriter(writer);
out.println("public class HelloWorld {");
out.println(" public static void main(String args[]) {");
out.println(" System.out.println(\"This is in another java file\");");
out.println(" }");
out.println("}");
out.close();
JavaFileObject file = new JavaSourceFromString("HelloWorld", writer.toString());
Iterable<? extends JavaFileObject> compilationUnits = Arrays.asList(file);
CompilationTask task = compiler.getTask(null, null, diagnostics, null, null, compilationUnits);
boolean success = task.call();
for (Diagnostic diagnostic : diagnostics.getDiagnostics()) {
System.out.println(diagnostic.getCode());
System.out.println(diagnostic.getKind());
System.out.println(diagnostic.getPosition());
System.out.println(diagnostic.getStartPosition());
System.out.println(diagnostic.getEndPosition());
System.out.println(diagnostic.getSource());
System.out.println(diagnostic.getMessage(null));
}
System.out.println("Success: " + success);
if (success) {
try {
Class.forName("HelloWorld").getDeclaredMethod("main", new Class[] { String[].class })
.invoke(null, new Object[] { null });
} catch (ClassNotFoundException e) {
System.err.println("Class not found: " + e);
} catch (NoSuchMethodException e) {
System.err.println("No such method: " + e);
} catch (IllegalAccessException e) {
System.err.println("Illegal access: " + e);
} catch (InvocationTargetException e) {
System.err.println("Invocation target: " + e);
}
}
}
} class JavaSourceFromString extends SimpleJavaFileObject {
final String code;
JavaSourceFromString(String name, String code) {
super(URI.create("string:///" + name.replace(".","/") + Kind.SOURCE.extension),Kind.SOURCE);
this.code = code;
}
@Override
public CharSequence getCharContent(boolean ignoreEncodingErrors) {
return code;
}
}
</source>
Java Compiler tools: how you can compile a Java source from inside a Java program
<source lang="java">
import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.List; import javax.tools.JavaCompilerTool; import javax.tools.JavaFileObject; import javax.tools.StandardJavaFileManager; import javax.tools.ToolProvider; import javax.tools.JavaCompilerTool.rupilationTask; public class JDK6JavaCompilerDemo {
public static void main (String[] args) {
String sourceFile = "c:/HelloWorld.Java";
JavaCompilerTool compiler = ToolProvider.getSystemJavaCompilerTool ();
StandardJavaFileManager fileManager =
compiler.getStandardFileManager (null);
// prepare the source file(s) to compile
List<File> sourceFileList = new ArrayList <File> ();
sourceFileList.add (new File (sourceFile));
Iterable<? extends JavaFileObject> compilationUnits =fileManager.getJavaFileObjectsFromFiles (sourceFileList);
CompilationTask task = compiler.getTask (null,fileManager, null, null, null, compilationUnits);
task.run ();
boolean result = task.getResult ();
if (result) {
System.out.println ("Compilation was successful");
} else {
System.out.println ("Compilation failed");
}
try {
fileManager.close ();
} catch (IOException e) {
}
}
} /*
* import Java.util.Date;
public class HelloWorld {
public static void main (String[] args) {
Date date = new Date (1234, 11, 12);
System.out.println ("[" + date + "] Hello World !");
}
}
*/
</source>
