@RequestMapping("/getPictureForpeople")
public void getPictureForpeople(HttpServletRequest request, HttpServletResponse response) throws IOException, SQLException {
    Connection conn = null;
    conn = GetJDBCConnection.getJDBCConnection();
    Statement stmt = conn.createStatement();
    String getPicSQL = "select header from lc0039999.idmidentityinfo where code = ‘houzt‘";
    ResultSet rs = stmt.executeQuery(getPicSQL);
    Blob img=null;
    if(rs.next()) {
        img = rs.getBlob("header");
    }
    long size=img.length();
    byte[] bs=img.getBytes(1, (int)size);
   // response.setContentType("image/jpeg");
    ServletOutputStream outs=response.getOutputStream();
    outs.write(bs);
    outs.flush();
}

<img src="http://www.mamicode.com/${ctx}/PersonPages/getPictureForpeople" style="width: 100px;height:120px;border:5px solid #104365;clear: both; display: block; margin:auto; "/>

img显示从数据库取出blob字段