java按字节拆分字符串 后在拼成字符串

public static void main(String[] args) throws UnsupportedEncodingException {

    String arr[] = splitByByteSize("abc刘defghijklmnopqrstuvwxyz",4);

    int byteLen = 0;

    for(int i=0;i<arr.length;i++){

        byteLen+=arr[i].getBytes().length;

    }

    byte[] bytes = new byte[byteLen];

    int offset = 0;

    for(int i=0;i<arr.length;i++){

        System.arraycopy(arr[i].getBytes("utf-8"), 0, bytes, offset, arr[i].getBytes("utf-8").length);

        offset += arr[i].getBytes("utf-8").length;

    }



    System.out.println(">>"+new String(bytes));

}



public static String[] splitByByteSize(String content, int size) throws UnsupportedEncodingException{

    byte[] bytes = content.getBytes("utf-8");

    int totalSize = bytes.length;

    int partNum = 0;

    if(totalSize == 0){

        return new String[0];

    }

    if(totalSize % size == 0){

        partNum = totalSize / size;

    }else{

        partNum = totalSize / size + 1;

    }

    String[] arr = new String[partNum];

    int offset = 0;

    byte newBytes[] = new byte[size];

    for(int i=0;i<partNum-1;i++){

        System.arraycopy(bytes, offset, newBytes, 0, size);

        arr[i] = new String(newBytes,"utf-8");

        offset += size;

    }

    System.arraycopy(bytes, offset, newBytes, 0, totalSize-offset);

    arr[partNum-1] = new String(newBytes,"utf-8");

    return arr;



}