ASM如何生成Java類

發布時間：2021-11-26 17:36:47 來源：億速云閱讀：233 作者：柒染欄目：編程語言

這期內容當中小編將會給大家帶來有關ASM如何生成Java類，文章內容豐富且以專業的角度為大家分析和敘述，閱讀完這篇文章希望大家可以有所收獲。

public class GeneratorBean implements org.objectweb.asm.Opcodes
{
public byte[] getBeanByName (String beanname, String[][] nameAndDesc)
{
ClassWriter classWriter = new ClassWriter (ClassWriter.COMPUTE_MAXS);
classWriter.visit (this.V1_5, this.ACC_PUBLIC, beanname, null, "java/lang/Object", new String[]
{ "java/io/Serializable" });
classWriter.visitField (this.ACC_FINAL | this.ACC_STATIC | this.ACC_PRIVATE, "serialVersionUID", "J", null,
System.currentTimeMillis ());
MethodVisitor mv = classWriter.visitMethod (this.ACC_PUBLIC, "

", "()V", null, null);
mv.visitCode ();
mv.visitVarInsn (this.ALOAD, 0);
mv.visitMethodInsn (this.INVOKESPECIAL, "java/lang/Object", "", "()V");
mv.visitInsn (this.RETURN);
mv.visitEnd ();
String desc = null;
for (int i = 0; i < nameAndDesc.length; i++)
{
nameAndDesc[i][1] = nameAndDesc[i][1].replace (".", "/");
desc = formatDesc (nameAndDesc[i][1]);
classWriter.visitField (this.ACC_PRIVATE, nameAndDesc[i][0], desc, null, null);
mv = classWriter.visitMethod (this.ACC_PUBLIC, "get" + nameAndDesc[i][0], "()" + desc, null, null);
mv.visitCode ();
mv.visitVarInsn (this.ALOAD, 0);
mv.visitFieldInsn (this.GETFIELD, beanname, nameAndDesc[i][0], nameAndDesc[i][1]);
mv.visitInsn (this.IRETURN);
mv.visitEnd ();
mv = classWriter.visitMethod (this.ACC_PUBLIC, "set" + nameAndDesc[i][0], "(" + desc + ")V", null, null);
mv.visitCode ();
mv.visitVarInsn (ALOAD, 0);
mv.visitVarInsn (ILOAD, 1);
mv.visitFieldInsn (PUTFIELD, beanname, nameAndDesc[i][0], nameAndDesc[i][1]);
mv.visitInsn (RETURN);
mv.visitEnd ();
}
return classWriter.toByteArray ();
}

上述就是小編為大家分享的ASM如何生成Java類了，如果剛好有類似的疑惑，不妨參照上述分析進行理解。如果想知道更多相關知識，歡迎關注億速云行業資訊頻道。

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