compile Java code to target folder - Java javax.tools

Java examples for javax.tools:JavaCompiler

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Description

compile Java code to target folder

Demo Code


import java.io.File;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Arrays;
import java.util.List;
import javax.tools.DiagnosticCollector;
import javax.tools.JavaCompiler;
import javax.tools.JavaCompiler.CompilationTask;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;

public class Main{
    public static void main(String[] argv) throws Exception{
        String sourceDir = "java2s.com";
        String targetDir = "java2s.com";
        System.out.println(compile(sourceDir,targetDir));
    }//  w  w w  . ja  v  a  2s  .co  m
    
    public static CompileResult compile(String sourceDir, String targetDir)
            throws Throwable {

        // sourceDir is blank
        if (isBlank(sourceDir)) {
            throw new IllegalArgumentException("sourceDir is blank");
        }
        // targetDir is blank
        if (isBlank(targetDir)) {
            throw new IllegalArgumentException("targetDir is blank");
        }

        /*
         * ? -d:??classes?? -cp:??classPath
         * -sourcepath:??
         */
        String classPath = SystemClassPathFinder.findSystemClassPath();
        Iterable<String> options = null;
        if (isBlank(classPath)) {
            options = Arrays.asList("-d", targetDir, "-sourcepath",
                    sourceDir);
        } else {
            options = Arrays.asList("-d", targetDir, "-sourcepath",
                    sourceDir, "-cp",
                    SystemClassPathFinder.findSystemClassPath());
        }
        // classes
        FileOperateUtil.mkdirs(targetDir);
        // 
        return compileFiles(sourceDir, options);
    }
    private static boolean isBlank(String abc) {
        return abc == null ? true : abc.trim().equals("");
    }
    
    private static CompileResult compileFiles(String sourceDir,
            Iterable<String> options) throws IOException {

        List<File> sourceFiles = FileOperateUtil.findSourceFiles(sourceDir);

        // 
        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

        // 
        StandardJavaFileManager fileManager = compiler
                .getStandardFileManager(null, null, null);

        // ?
        Iterable<? extends JavaFileObject> compilationUnits = fileManager
                .getJavaFileObjectsFromFiles(sourceFiles);

        // 
        DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<JavaFileObject>();

        try {
            CompilationTask compilationTask = compiler.getTask(null,
                    fileManager, diagnostics, options, null,
                    compilationUnits);

            // ?
            CompileResult compileResult = new CompileResult(
                    compilationTask.call(), diagnostics);
            if (!compileResult.isCompileSuccess()) {
                System.err.println("compile error,sourceDir:" + sourceDir
                        + " errorInfo:" + compileResult.toString());
            }
            return compileResult;
        } finally {
            fileManager.close();
        }
    }
}

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