android客户端到服务器乱码解决，

//客户端  
 public String changeToUnicode(String str){
  StringBuffer strBuff = new StringBuffer();
  for(int i=0;i<str.length();i++){
  String temp = Integer.toHexString(str.charAt(i));
  if(temp.length()!=4){
  temp = "00"+temp;
  }
  if(temp.equals("00d")){
  temp = "0"+temp;
  }
  if(temp.equals("00a")){
  temp = "0"+temp;
  }
  strBuff.append(temp.substring(0, temp.length()-2));
  strBuff.append(temp.substring(temp.length()-2, temp.length()));
  }
  String returnData = strBuff.toString();
  return returnData;
  
  }

//服务器端
public String changeToword(String str){
String retData = null;
String tempStr = new String(str);
String[] chStr = new String[str.length()/4];
for(int i=0;i<str.length();i++){
if(i%4==3){
chStr[i/4] = new String(tempStr.substring(0, 4));