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com.hframework.common.dyncompile.FrameworkClassLoader Maven / Gradle / Ivy
package com.hframework.common.dyncompile;
import javax.tools.DiagnosticCollector;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.ToolProvider;
import java.io.StringWriter;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.List;
/**
* Created by zhangquanhong on 2017/3/14.
*/
public class FrameworkClassLoader extends ClassLoader {
private final JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
private final FileManager manager = new FileManager(compiler); //自定义FileManager
public FrameworkClassLoader() {
//共享FrameworkClassLoader的ClassLoader
super(FrameworkClassLoader.getSystemClassLoader());
}
FrameworkClassLoader(ClassLoader cl) {
super(cl);
}
public Class compileClass(String name, String code) throws MalformedURLException, ClassNotFoundException {
List list = new ArrayList();
list.add(new Source(name, JavaFileObject.Kind.SOURCE, code)); //输入
StringWriter stringWriter = new StringWriter();
// System.out.println(System.getProperty("user.dir"));
DiagnosticCollector diagnosticCollector = new DiagnosticCollector();
compiler.getTask(stringWriter, manager,diagnosticCollector , new ArrayList(){{
// add("-classpath");
// add("//D:/my_workspace/hframe-trunk/hframe-beans/target/classes");
// add("-d");
// add("D:/my_workspace/hframe-trunk/hframe-beans/target/classes/com/hframework/common/dyncompile");
}}, null, list).call();
Output mc = manager.getOutput(name); //输出
List diagnostics = diagnosticCollector.getDiagnostics();
if(diagnostics != null && diagnostics.size() > 0) {
StringBuffer sb = new StringBuffer();
for (Object diagnostic : diagnostics) {
sb.append(diagnostic);
// System.out.println(diagnostic);
}
throw new RuntimeException(sb.toString());
}
if (mc != null) {
byte[] array = mc.toByteArray(); //转换成byte[]
return defineClass(name, array, 0, array.length); //需要继承ClassLoader
}
return null;
}
public Class compileClass(List names, List code) throws MalformedURLException, ClassNotFoundException {
List list = new ArrayList();
for (String name : names) {
list.add(new Source(name, JavaFileObject.Kind.SOURCE, code.get(names.indexOf(name)))); //输入
}
StringWriter stringWriter = new StringWriter();
compiler.getTask(stringWriter, manager, null, new ArrayList(){{
// add("-d");
// add("D:/my_workspace/hframe-trunk/hframe-beans/target/classes");
// add("-classpath");
// add("D:/my_workspace/hframe-trunk/hframe-beans/target/classes");
}}, null, list).call();
Output mc = manager.getOutput(names.get(names.size() - 1)); //输出
if (mc != null) {
byte[] array = mc.toByteArray(); //转换成byte[]
return defineClass(names.get(names.size() - 1), array, 0, array.length); //需要继承ClassLoader
}
return null;
}
// public static void main(String[] args) throws MalformedURLException, ClassNotFoundException {
// String strjava = "public class TestJava{public static void main(String[] args){System.out.println(\"nihao\");}}";
// Class testJava = new FrameworkClassLoader().compileClass("TestJava", strjava);
// System.out.println(testJava.getName());
// }
public static void main(String[] args) throws MalformedURLException, ClassNotFoundException, IllegalAccessException, InstantiationException {
String strjava = "package com.hframework.common.dyncompile;\n" +
"public class TestSpringContextExecutor extends AbstractSpringContextExecutor implements SpringContextExecutor {\n" +
" public Integer execute() {\n" +
" return Integer.valueOf(dao.query(\"1\",\"1\",\"1\"));\n" +
" }\n" +
"}\n";
Class testJava = new FrameworkClassLoader().compileClass("com.hframework.common.dyncompile." + "TestSpringContextExecutor", strjava);
System.out.println(((SpringContextExecutor)testJava.newInstance()).execute());
}
// public static void main(String[] args) throws MalformedURLException, ClassNotFoundException, IllegalAccessException, InstantiationException {
// Class testJava = new FrameworkClassLoader().compileClass(new ArrayList(){{
// add("SpringContextExecutor");
// add("AbstractSpringContextExecutor");
// add("TestSpringContextExecutor");
// }}, new ArrayList(){{
// add("package com.hframework.common.dyncompile.demo;\n" +
// "public interface SpringContextExecutor {\n" +
// "\n" +
// "\n" +
// " public Integer execute();\n" +
// "}\n");
// add("package com.hframework.common.dyncompile.demo;\n" +
// "public abstract class AbstractSpringContextExecutor {\n" +
// " protected GenericDAO dao = new GenericDAO();\n" +
// "\n" +
// " public static class GenericDAO{\n" +
// " public String query(String tableName, String keyColumn, String returnColumn) {\n" +
// " return \"123456\";\n" +
// " }\n" +
// " }\n" +
// "}\n");
// add("package com.hframework.common.dyncompile.demo;\n" +
// "public class TestSpringContextExecutor extends AbstractSpringContextExecutor implements SpringContextExecutor {\n" +
// " public Integer execute() {\n" +
// " return Integer.valueOf(dao.query(\"1\",\"1\",\"1\"));\n" +
// " }\n" +
// "}\n");
// }});
//
//
// System.out.println(((SpringContextExecutor)testJava.newInstance()).execute());
// }
}
