IDEA利用jclasslib 修改class文件的实现

package com.yys.screendisplay.controller;

import java.io.*;

import com.sun.org.apache.bcel.internal.classfile.constantstring;

import org.gjt.jclasslib.io.classfilewriter;

import org.gjt.jclasslib.structures.classfile;

import org.gjt.jclasslib.structures.constant;

import org.gjt.jclasslib.structures.constants.constantdoubleinfo;

import org.gjt.jclasslib.structures.constants.constantutf8info;

import org.gjt.jclasslib.structures.constants.constantstringinfo;

public class test {

  public static void main(string[] args) throws exception {

   string filepath = "c:\\users\\hms\\desktop\\appservice.class" ;

   fileinputstream fis = new fileinputstream(filepath);

   datainput di = new datainputstream(fis);

   classfile cf = new classfile();

   cf.read(di);

   constant[] infos = cf.getconstantpool();

   int count = infos.length;

   for ( int i = 0 ; i < count; i++) {

    if (infos[i] != null ) {

     if (i== 1813 ){

      system.out.print(i);

      system.out.print( " = " );

      system.out.print(infos[i].getverbose());

      system.out.print( " = " );

      system.out.println(infos[i]);

      system.out.println(infos[i].getclass().getsimplename());

      constantutf8info uinfo = (constantutf8info)infos[i]; //根据对应的类型转换

      uinfo.setstring( "" );

      infos[i]=uinfo;

     }

    }

   }

   cf.setconstantpool(infos);

   fis.close();

   file f = new file(filepath);

   classfilewriter.writetofile(f, cf);

  }

}

<dependency>

  <groupid>com.fasterxml.jackson.module</groupid>

   <artifactid>jackson-module-kotlin</artifactid>

  <version> 2.9 . 4.1 </version>

</dependency>