Java从数据库中读取图片并转化为字符串类型

/**

*Java从数据库中读取图片并转化为字符串类型

*/

public String getUser(int account){

String msg1=null;
JSONObject json=new JSONObject(); 
JSONArray jsonMembers = new JSONArray(); 
JSONObject json1=new JSONObject();
try {
String sql = "select * from yq_user where uaccount="+account;
Connection conn = DBUtil.getDBUtil().getConnection();
PreparedStatement ps = conn.prepareStatement(sql);
ResultSet rs = ps.executeQuery();
InputStream in=null; 
OutputStream out=null;
while(rs.next()){
in=rs.getBinaryStream("uimg"); //获取rs结果集中的每张图片
//申明byte数组,用来存放图片流 ，注意图片的大小
byte[] b=new byte[100000]; 
in.read(b); //从InputStream对象中读取数据放进byte数组中 

String s = new String(b,"ISO-8859-1");//注意编码格式，转码格式错误，会导致图片乱码

json1.put("uaccount", rs.getInt("uaccount"));
json1.put("unick", rs.getString("unick")); 
json1.put("uavatar",rs.getString("uavatar")); 
json1.put("utrends", rs.getString("utrends")); 
json1.put("usex",rs.getString("usex")); 
json1.put("uage",rs.getInt("uage")); 
json1.put("ulev",rs.getInt("ulev")); 
json1.put("uimg",s); 
jsonMembers.put(json1); 
json.put("user", jsonMembers);
msg1=json.toString();

}
} catch (Exception e) {
e.printStackTrace();
}
return msg1;
}