tanghc
4 years ago
parent
f8b8e5fca1
commit
a16a7aa2d3
@ -1,186 +0,0 @@ |
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package com.gitee.sop.servercommon.param; |
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import com.gitee.sop.servercommon.util.FieldUtil; |
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import org.apache.commons.io.FileUtils; |
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import org.apache.commons.lang.StringUtils; |
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import org.objectweb.asm.AnnotationVisitor; |
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import org.objectweb.asm.ClassWriter; |
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import org.objectweb.asm.FieldVisitor; |
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import org.objectweb.asm.MethodVisitor; |
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import org.objectweb.asm.Opcodes; |
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import org.objectweb.asm.Type; |
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import org.slf4j.Logger; |
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import org.slf4j.LoggerFactory; |
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import java.io.File; |
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import java.io.IOException; |
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import java.lang.annotation.Annotation; |
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import java.lang.reflect.Parameter; |
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import java.util.Map; |
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import java.util.Set; |
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import java.util.concurrent.atomic.AtomicInteger; |
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/** |
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* 包装单个参数 |
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* <code> |
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* public class WrapperParam0id implements SingleValue { |
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* public String id; |
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* |
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* public Object fetchValue() { |
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* return this.id; |
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* } |
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* } |
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* </code> |
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* |
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* @author tanghc |
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*/ |
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public class SingleParameterClassCreator implements Opcodes { |
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private static final Logger logger = LoggerFactory.getLogger(SingleParameterClassCreator.class); |
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private static final String FOLDER_END_CHAR = "/"; |
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private static final String CLASS_FILE_SUFFIX = ".class"; |
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private static final String WRAPPER_PARAM = "WrapperParam"; |
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private static final String PKG = "com/gitee/sop/servercommon/gen/"; |
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private static final String OBJECT = "java/lang/Object"; |
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private static final ParameterClassLoader CLASS_LOADER = new ParameterClassLoader(); |
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private static final AtomicInteger i = new AtomicInteger(); |
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// 生成class文件的保存路径
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private String savePath; |
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/** |
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* 生成一个类，里面指放这个字段 |
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* |
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* @param parameter 字段，只能是基本类型或字符串类型 |
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* @return 如果不是基本类型或字符串类型，返回null |
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*/ |
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public Class<?> create(Parameter parameter, String paramName) { |
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Class<?> paramType = parameter.getType(); |
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if (!FieldUtil.isNumberStringEnumType(paramType)) { |
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return null; |
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} |
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/* *******************************class********************************************** */ |
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// 创建一个ClassWriter, 以生成一个新的类
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ClassWriter classWriter = new ClassWriter(0); |
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// 类名
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String className = WRAPPER_PARAM + i.incrementAndGet() + paramName; |
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// 类路径名：com/gitee/sop/service/gen/WrapperParam
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String classpathName = PKG + className; |
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classWriter.visit(V1_8, ACC_PUBLIC, classpathName, null, OBJECT, null); |
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/* ********************************constructor********************************************* */ |
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MethodVisitor methodVisitor = classWriter.visitMethod(ACC_PUBLIC, "<init>", "()V", null, |
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null); |
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methodVisitor.visitVarInsn(ALOAD, 0); |
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methodVisitor.visitMethodInsn(INVOKESPECIAL, OBJECT, "<init>", "()V", false); |
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methodVisitor.visitInsn(RETURN); |
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methodVisitor.visitMaxs(1, 1); |
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methodVisitor.visitEnd(); |
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/* ************************************parameter***************************************** */ |
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// 生成String name字段, Ljava/lang/String;
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Type type = Type.getType(paramType); |
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FieldVisitor fieldVisitor = classWriter.visitField(ACC_PUBLIC, paramName, type.getDescriptor(), null, null); |
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// 生成验证注解
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Annotation[] annotations = parameter.getAnnotations(); |
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for (Annotation annotation : annotations) { |
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ValidationAnnotationDefinition validationAnnotationDefinition = ValidationAnnotationDefinitionFactory.build(annotation); |
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if (validationAnnotationDefinition == null) { |
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continue; |
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} |
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Class<?> annoClass = validationAnnotationDefinition.getAnnotationClass(); |
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Type annoType = Type.getType(annoClass); |
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AnnotationVisitor annotationVisitor = fieldVisitor.visitAnnotation(annoType.getDescriptor(), true); |
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Map<String, Object> properties = validationAnnotationDefinition.getProperties(); |
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if (properties != null) { |
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try { |
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Set<Map.Entry<String, Object>> entrySet = properties.entrySet(); |
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for (Map.Entry<String, Object> entry : entrySet) { |
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Object val = entry.getValue(); |
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if (val != null) { |
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// 设置枚举值
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if (val.getClass().isEnum()) { |
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Type eType = Type.getType(val.getClass()); |
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annotationVisitor.visitEnum(entry.getKey(), eType.getDescriptor(), val.toString()); |
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} else if (val instanceof Class<?>) { |
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// val是Class类型
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Type vType = Type.getType((Class<?>) val); |
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annotationVisitor.visit(entry.getKey(), vType); |
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} else { |
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annotationVisitor.visit(entry.getKey(), val); |
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} |
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} |
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} |
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} catch (Exception e) { |
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logger.error("ASM生成注解出错", e); |
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} |
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} |
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// 结束生成注解
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annotationVisitor.visitEnd(); |
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logger.debug("ASM生成参数注解，参数：{}，注解：{}，注解属性：{}", paramName, annoClass.getName(), properties); |
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} |
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fieldVisitor.visitEnd(); |
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classWriter.visitEnd(); |
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/* **********************************generate and load******************************************* */ |
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byte[] code = classWriter.toByteArray(); |
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if (StringUtils.isNotBlank(savePath)) { |
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if (!savePath.endsWith(FOLDER_END_CHAR)) { |
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savePath = savePath + FOLDER_END_CHAR; |
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} |
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this.writeClassFile(code, savePath + className + CLASS_FILE_SUFFIX); |
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} |
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Class<?> clazz = CLASS_LOADER.defineClass(code); |
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logger.debug("生成参数包装类：{}，包装参数名：{}，参数类型：{}", clazz.getName(), paramName, paramType); |
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return clazz; |
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} |
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protected void writeClassFile(byte[] code, String filepath) { |
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// 将二进制流写到本地磁盘上
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try { |
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FileUtils.writeByteArrayToFile(new File(filepath), code); |
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} catch (IOException e) { |
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logger.error("写文件错误，filepath:" + filepath, e); |
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} |
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} |
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public void setSavePath(String savePath) { |
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this.savePath = savePath; |
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} |
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// 自定义类加载器
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static class ParameterClassLoader extends ClassLoader { |
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public ParameterClassLoader() { |
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/* |
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指定父加载器，不指定默认为AppClassLoader |
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springboot启动会使用自带的org.springframework.boot.loader.LaunchedURLClassLoader |
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如果不指定，会出现加载器不一致，导致ASM生成的class获取不到字段的注解。 |
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因此ASM生成的class必须使用当前ClassLoader进行生成。 |
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*/ |
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super(Thread.currentThread().getContextClassLoader()); |
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} |
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/** |
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* 加载class |
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* |
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* @param clazz 字节码 |
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* @return |
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*/ |
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public Class<?> defineClass(byte[] clazz) { |
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return this.defineClass(null, clazz, 0, clazz.length); |
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} |
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} |
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} |
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@ -1,44 +0,0 @@ |
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package com.gitee.sop.servercommon.param; |
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import com.gitee.sop.servercommon.annotation.Open; |
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import com.gitee.sop.servercommon.bean.ServiceConfig; |
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import java.lang.reflect.Parameter; |
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import java.util.Map; |
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import java.util.concurrent.ConcurrentHashMap; |
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/** |
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* 存放单个参数 |
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* @author tanghc |
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*/ |
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public class SingleParameterContext { |
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private static SingleParameterClassCreator singleFieldWrapper = new SingleParameterClassCreator(); |
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private static final Map<String, SingleParameterContextValue> context = new ConcurrentHashMap<>(16); |
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/** |
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* 添加单个参数 |
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* @param parameter 接口单个参数 |
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* @param open open注解 |
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*/ |
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public static void add(Parameter parameter, Open open) { |
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String version = open.version(); |
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version = "".equals(version) ? ServiceConfig.getInstance().getDefaultVersion() : version; |
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String parameterName = parameter.getName(); |
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String key = open.value() + version + parameterName; |
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Class<?> wrapClass = singleFieldWrapper.create(parameter, parameterName); |
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SingleParameterContextValue value = new SingleParameterContextValue(); |
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value.setParameterName(parameterName); |
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value.setWrapClass(wrapClass); |
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context.put(key, value); |
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} |
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public static SingleParameterContextValue get(String name, String version) { |
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return context.get(name + version); |
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} |
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public static void setSingleFieldWrapper(SingleParameterClassCreator singleFieldWrapper) { |
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SingleParameterContext.singleFieldWrapper = singleFieldWrapper; |
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} |
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} |
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@ -1,24 +0,0 @@ |
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package com.gitee.sop.servercommon.param; |
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public class SingleParameterContextValue { |
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/** 参数名称 */ |
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private String parameterName; |
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private Class<?> wrapClass; |
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public String getParameterName() { |
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return parameterName; |
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} |
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public void setParameterName(String parameterName) { |
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this.parameterName = parameterName; |
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} |
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public Class<?> getWrapClass() { |
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return wrapClass; |
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} |
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public void setWrapClass(Class<?> wrapClass) { |
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this.wrapClass = wrapClass; |
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} |
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} |
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@ -1,27 +0,0 @@ |
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package com.gitee.sop.servercommon.param; |
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/** |
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* @author tanghc |
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*/ |
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public class SingleParameterWrapper { |
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/** 包裹类实例 */ |
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private Object wrapperObject; |
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/** 参数值 */ |
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private Object paramValue; |
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public Object getWrapperObject() { |
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return wrapperObject; |
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} |
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public void setWrapperObject(Object wrapperObject) { |
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this.wrapperObject = wrapperObject; |
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} |
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public Object getParamValue() { |
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return paramValue; |
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} |
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public void setParamValue(Object paramValue) { |
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this.paramValue = paramValue; |
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} |
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} |
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@ -1,128 +0,0 @@ |
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package com.gitee.sop.servercommon.util; |
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import org.objectweb.asm.ClassReader; |
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import org.objectweb.asm.ClassVisitor; |
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import org.objectweb.asm.Label; |
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import org.objectweb.asm.MethodVisitor; |
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import org.objectweb.asm.Opcodes; |
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import org.objectweb.asm.Type; |
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import org.slf4j.Logger; |
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import org.slf4j.LoggerFactory; |
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import org.springframework.util.ClassUtils; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.lang.reflect.Method; |
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import java.lang.reflect.Modifier; |
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import java.util.Arrays; |
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/** |
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* @author tanghc |
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*/ |
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public class FieldUtil { |
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private static final Logger log = LoggerFactory.getLogger(FieldUtil.class); |
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private static final String CLASS_SUFFIX = ".class"; |
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private FieldUtil() { |
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} |
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/** |
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* 判断这个字段是否是数字类型或字符串类型或枚举类型 |
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* |
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* @param type 字段类型 |
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* @return true：是数字或字符串类型或枚举类型 |
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*/ |
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public static boolean isNumberStringEnumType(Class<?> type) { |
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if (type == String.class) { |
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return true; |
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} |
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if (type.getGenericSuperclass() == Number.class) { |
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return true; |
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} |
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if (type.isPrimitive()) { |
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return true; |
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} |
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if (type.isEnum()) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* 获取指定类指定方法的参数名 |
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* @param clazz 要获取参数名的方法所属的类 |
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* @param method 要获取参数名的方法 |
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* @param index 参数索引，从0开始 |
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* @return 返回指定类指定方法的参数名，没有返回空字符串 |
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*/ |
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public static String getMethodParameterName(Class<?> clazz, final Method method, int index) { |
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String[] names = getMethodParameterNamesByAsm(clazz, method); |
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if (names.length == 0) { |
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return ""; |
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} |
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return names[index]; |
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} |
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/** |
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* 获取指定类指定方法的参数名 |
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* |
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* @param clazz 要获取参数名的方法所属的类 |
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* @param method 要获取参数名的方法 |
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* @return 按参数顺序排列的参数名列表，如果没有参数，则返回空数组 |
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*/ |
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public static String[] getMethodParameterNamesByAsm(Class<?> clazz, final Method method) { |
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final Class<?>[] parameterTypes = method.getParameterTypes(); |
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if (parameterTypes == null || parameterTypes.length == 0) { |
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return new String[0]; |
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} |
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final Type[] types = new Type[parameterTypes.length]; |
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for (int i = 0; i < parameterTypes.length; i++) { |
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types[i] = Type.getType(parameterTypes[i]); |
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} |
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final String[] parameterNames = new String[parameterTypes.length]; |
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// 解决clazz对象是cglib对象导致空指针异常
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// 获取真实的class，如果是cglib类，则返回父类class
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Class<?> realClass = ClassUtils.getUserClass(clazz); |
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String className = realClass.getName(); |
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int lastDotIndex = className.lastIndexOf('.'); |
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className = className.substring(lastDotIndex + 1) + CLASS_SUFFIX; |
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InputStream is = realClass.getResourceAsStream(className); |
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try { |
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ClassReader classReader = new ClassReader(is); |
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classReader.accept(new ClassVisitor(Opcodes.ASM6) { |
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@Override |
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public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) { |
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// 只处理指定的方法
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Type[] argumentTypes = Type.getArgumentTypes(desc); |
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if (!method.getName().equals(name) || !Arrays.equals(argumentTypes, types)) { |
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return null; |
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} |
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return new MethodVisitor(Opcodes.ASM6) { |
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@Override |
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public void visitLocalVariable(String name, String desc, String signature, Label start, Label end, int index) { |
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int i = index - 1; |
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// 如果是静态方法，则第一就是参数
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// 如果不是静态方法，则第一个是"this"，然后才是方法的参数
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if (Modifier.isStatic(method.getModifiers())) { |
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i = index; |
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} |
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if (i >= 0 && i < parameterNames.length) { |
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parameterNames[i] = name; |
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} |
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super.visitLocalVariable(name, desc, signature, start, |
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end, index); |
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} |
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}; |
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} |
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}, 0); |
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} catch (IOException e) { |
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log.error("生成asm失败，oriClass:{}, realClass:{} method:{}", clazz.getName(), realClass.getName(), method.toGenericString(), e); |
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} |
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return parameterNames; |
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} |
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} |
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