033.byte[]与String互转不一致引起的bug

1.结论​

      Java中String内置的public String(byte[] bytes)和public byte[] getBytes()对于不合法的utf-8字节流在解析时会增删字节。

2.为什么会出现这样的bug?

    (1)首先准备这样的一段文本aaa.txt

China WangLei WangTao 3,USA jordan alex 1,Australia kobe james 2,UK Dale Tracy 4

 （2）Team.java

package com.test.demo;

public class Team
{
    public int teamRanking;//球队排名

    public Team()
    {

    }

    public Team(int teamRanking)
    {
        this.teamRanking = teamRanking;
    }

    public int getTeamRanking()
    {
        return teamRanking;
    }

    public void setTeamRanking(int teamRanking)
    {
        this.teamRanking = teamRanking;
    }
}

 (3)TeamMain.java

package com.test.demo;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;

public class TestMain
{
    public int inDataTeamArraylist(String fileName) throws IOException
    {
        FileInputStream fisRead = new FileInputStream(fileName);
        byte[] byteRead = new byte[1000];
        fisRead.read(byteRead);
        fisRead.close();
        String stringRead = new String(byteRead);
        String[] stringArray = stringRead.split(",");//这里获取到的是4个String字符串
        for (int i = 0; i < stringArray.length; i++)
        {
            System.out.println(Integer.parseInt(stringArray[i].split(" ")[3]));

        }
        return 0;
    }

    public static void main(String[] args) throws IOException
    {
        String file = "D://idea//storehouse//Item//untitledTest//src//com//test//demo//aaa.txt";
        TestMain testMain = new TestMain();
        System.out.println(testMain.inDataTeamArraylist(file));
    }

}

 (4)运行结果，报错的原因就是，byte[]与String互转不一致引起的bug

（5）改正后的TestMain.java

package com.test.demo;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;

public class TestMain
{
    public String inDataTeamArraylist(String fileName) throws IOException
    {
        FileInputStream fisRead = new FileInputStream(fileName);
        StringBuilder stringBuilder = new StringBuilder(100);
        int ch;
        while ((ch = fisRead.read()) != -1)
        {
            stringBuilder.append((char)ch);
        }
        fisRead.close();

        String[] stringArray = stringBuilder.toString().split(",");//这里获取到的是4个String字符串
        for (int i = 0; i < stringArray.length; i++)
        {
            System.out.println(Integer.parseInt(stringArray[i].split(" ")[3]));

        }
        return "成功了呀！！！";
    }

    public static void main(String[] args) throws IOException
    {
        String file = "D://idea//storehouse//Item//untitledTest//src//com//test//demo//aaa.txt";
        TestMain testMain = new TestMain();
        System.out.println(testMain.inDataTeamArraylist(file));
    }

}

  (6)修改后的运行结果