Question

我已经构建了一个动态编译java源代码的应用程序，并获取已编译的类信息并存储到对象。

应用程序需要源目录和完全限定类名（例如MOCG.entity.Person）才能将文件添加到应用程序。

我在这个应用程序中使用Janino编译器。我曾经通过javax.tools.ToolProvider编译器实现，但我不知道如何编译多个文件，它不能自动编译相关的类。

现在我的代码工作得很好但是当我尝试编译接口类或抽象类时，它总是返回错误：

Caused by: org.codehaus.commons.compiler.CompileException: File /Users/chillyprig/IdeaProjects/Mockito/src/lab05/p1/dao/CourseDAO.java, Line 22, Column 9: Identifier expected in member declaration
at org.codehaus.janino.Parser.throwCompileException(Parser.java:2593)
at org.codehaus.janino.Parser.parseInterfaceBody(Parser.java:613)
at org.codehaus.janino.Parser.parseInterfaceDeclarationRest(Parser.java:518)
at org.codehaus.janino.Parser.parsePackageMemberTypeDeclaration(Parser.java:186)
at org.codehaus.janino.Parser.parseCompilationUnit(Parser.java:74)
at org.codehaus.janino.JavaSourceIClassLoader.findIClass(JavaSourceIClassLoader.java:150)
... 46 more

这是一个输入文件：

/**
 * Created with IntelliJ IDEA.
 * User: Dto
 * Date: 12/2/12
 * Time: 8:26 AM
 * To change this template use File | Settings | File Templates.
 */
package lab05.p1.dao;

import java.util.List;
import java.util.Set;

/**
 * This is the example of the DAO interface, you have to implement the implementation class to complete the DAO classes
 * @author  dto
 */
public interface CourseDAO {
    /**
     * Get all the courses
     * @return all courses stored in the persistence
     */
    List<Course> getCourses();

    /**
     * Get all students which enroll to the courses
     * @return all students in the persistence
     */
    Set<Student> getStudents();

    /**
     * Get the course by query the name provided
     * @param name the name of the course which the user wants
     * @return the course which contains the same name
     *          null if the course with specific name is not existed
     */
    Course getCourseByName(String name);

    /**
     * Get the Student by id
      * @param id the id of the student which we want to find
     * @return the student object with the specific id
     *          The empty student object if the student with the specific id is not exist
     */
    Student getStudentById(String id);
}

这是我剪辑的编译代码：

private Class compile() throws ClassNotFoundException, SourceDirectoryNotfoundException {
        ClassLoader classLoader = null;
        try{
            classLoader = new JavaSourceClassLoader(
                    Thread.currentThread().getContextClassLoader(),
                    new File[] {new File(sourceDir)},
                    (String) null
            );
        } catch (NullPointerException e){
            throw new SourceDirectoryNotfoundException();
        }
        Class<?> c = classLoader.loadClass(fullname);        
        return c;
    }

每个建议都非常感激。任何代码示例都会很好。

Answer 1

Janino是Java 1.4兼容的编译器 - 即it can't handle generics，它是在Java 5中引入的。第22行是开始List<Course>的行 - 使用泛型，这个编译器可以处理。

Janino动态编译接口类

1 个答案: