hjpengjava的专栏

 package text;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import javax.xml.parsers.DocumentBuilder;import javax.xml.pa

public String changeCharset(String str, String oldCharset, String newCharset)   throws UnsupportedEncodingException {  if (str != null) {   // 用源字符编码解码字符串   byte[] bs = str.getBytes(oldCharset); //