java读取文件里面部分汉字内容乱码的解决方案

package susq.path;​
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
​
/**
 * @author susq
 * @since 2018-05-18-19:28
 */
public class WrongMethodReadTxt {
    public static void main(String[] args) throws IOException {
        ClassLoader classLoader = WrongMethodReadTxt.class.getClassLoader();
        String filePath = classLoader.getResource("").getPath() + "/expect1.txt";
​
        System.out.println(filePath);
​
        File file = new File(filePath);
        try (FileInputStream in = new FileInputStream(file)) {
            byte[] bytes = new byte[1024];
            StringBuffer sb = new StringBuffer();
            int len;
            while ((len = in.read(bytes)) != -1) {
                sb.append(new String(bytes, 0, len));
            }
            System.out.println(sb.toString());
        }
    }
}

package susq.path;​
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
​
/**
 * @author susq
 * @since 2018-05-18-17:39
 */
public class SysPath {
    public static void main(String[] args) throws IOException {
        ClassLoader classLoader = SysPath.class.getClassLoader();
        String filePath = classLoader.getResource("").getPath() + "/expect1.txt";
​
        System.out.println(filePath);
​
        File file = new File(filePath);
        try (BufferedReader br = new BufferedReader(new FileReader(file))) {
            StringBuffer sb = new StringBuffer();
            while (br.ready()) {
                sb.append(br.readLine());
            }
            System.out.println(sb);
        }
    }
}

//这里我通过socket方式，获取流，并读取数据
    //代理需要外置配置(代理配置需要判断，若有配置，则添加，若无配置，则不添加)
    Socket socket = new Socket("192.168.99.100", 80);
 String url = "GET " + href + " HTTP/1.1\r\n\r\n";
 socket.getOutputStream().write(new String(url).getBytes());  
    InputStream is = socket.getInputStream();
    byte[] bs = new byte[1024]; 
 int i;
 StringBuilder str = new StringBuilder();
 while ((i = is.read(bs)) > 0) {
  //一定要加编码，不然,在输出到文件时，部分数据会乱
  str.append(new String(bs, 0, i,"UTF-8"));
        //由于socket读取不会断开，所以只能自断开连接读取
  if(new String(bs, 0, i,"UTF-8").contains("</html>")){
     break;
  }
 }

//代理需要外置配置(代理配置需要判断，若有配置，则添加，若无配置，则不添加)
  Socket socket = new Socket("192.168.99.100", 80);
  //Socket socket = new Socket();
  String url = "GET " + href + " HTTP/1.1\r\n\r\n";
  socket.getOutputStream().write(new String(url).getBytes());
  InputStream is = socket.getInputStream();
  
  //解决个别中文乱码
  StringBuilder str = new StringBuilder("");
  InputStreamReader isr = new InputStreamReader(is,"UTF-8");
  BufferedReader br = new BufferedReader(isr);
  String line = null;  
  while ((line = br.readLine()) != null) {
    str.append(line + "\n");
       if(line.contains("</html>")){
        break;
       }
  }