在
Compiler.java
,替换此行:
Iterable<String> options = Arrays.asList("-classpath", System.getProperty("user.home") + "/.m2/repository/com/google/guava/guava/19.0/guava-19.0.jar");
使用以下方法:
fileManager.setLocation(StandardLocation.CLASS_PATH, System.getProperty("user.home") + "/.m2/repository/com/google/guava/guava/19.0/guava-19.0.jar");
如果要添加多个类路径,只需使用列表:
fileManager.setLocation(StandardLocation.CLASS_PATH, Arrays.asList(new File("/tmp/jar1.jar"), new File("/tmp/jar2.jar")));
fileManager.setLocation
,的
-classpath
options
在某些情况下是行不通的,我不知道为什么。
下面是完整的工作源代码
编译器.java
,供日后参考。
package com.example.demo;
import java.io.File;
import java.io.IOException;
import javax.tools.*;
import java.net.URI;
import java.util.Arrays;
import java.util.Collections;
public class Compiler {
public static void compileTestClass() throws IOException {
Compiler.compile("com.example.TestClass", "package com.example;\n" +
"\n" +
"import com.google.common.collect.ImmutableMap;\n" +
"\n" +
"public class TestClass {\n" +
"}\n", new File("/tmp"));
}
public static void compile(String className, String javaSource, File outputDir) throws IOException {
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null);
outputDir.mkdirs();
fileManager.setLocation(StandardLocation.CLASS_OUTPUT, Collections.singleton(outputDir));
fileManager.setLocation(StandardLocation.CLASS_PATH, System.getProperty("user.home") + "/.m2/repository/com/google/guava/guava/19.0/guava-19.0.jar");
JavaSourceFromString javaSourceFromString = new JavaSourceFromString(className, javaSource);
Iterable<? extends JavaFileObject> compilationUnits = Collections.singletonList(javaSourceFromString);
JavaCompiler.CompilationTask task = compiler.getTask(null, fileManager, null, options, null, compilationUnits);
boolean success = task.call();
if (!success) {
throw new RuntimeException("Compilation failed.");
}
}
}
/**
* A file object used to represent source coming from a string.
*/
class JavaSourceFromString extends SimpleJavaFileObject {
/**
* The source code of this "file".
*/
final String code;
/**
* Constructs a new JavaSourceFromString.
*
* @param name the name of the compilation unit represented by this file object
* @param code the source code for the compilation unit represented by this file object
*/
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;
}
}
