whwnext2的专栏

可以选择任意一块进行截取图片包括jpg图片，gif图片，bmp图片等等，用户可以自定义任意一块进行截取，也可全屏截取，不需安装即可使用

对于三层构建// 查询的方法 public Set selectAll() { // 用HashSet查询 Set li1 = new HashSet(); // 用TreeSet查询 Set li2 = new TreeSet(); // 用LinkedHashSet查询 Set li3 = new LinkedHashSet(); try { String sql = "select t_fl.f_name,t_fl.f_remark,t_sp.s_name,t_sp.s_price,t_sp.f_id from t_fl,t_sp where t_fl.f_id=t_sp.f_id"; stmt = conn.prepareStatement(sql); rs = stmt.executeQuery(); while (rs.next()) { Fl fl = new Fl(); Sp sp = new Sp(); All al = new All(); fl.setF_name(rs.getString("f_name")); fl.setF_remark(rs.getString("f_remark")); sp.setF_id(rs.getInt("f_id")); sp.setS_name(rs.getString("s_name")); sp.setS_price(rs.getDouble("s_price")); al.setFl(fl); al.setSp(sp); li1.addAll(Arrays.asList(al.getFl().getF_name() + " " + al.getFl().getF_remark() + " " + al.getSp().getF_id() + " " + al.getSp().getS_name() + " " + al.getSp().getS_price())); li2.addAll(Arrays.asList(al.getFl().getF_name() + " " + al.getFl().getF_remark() + " " + al.getSp().getF_id() + " " + al.getSp().getS_name() + " " + al.getSp().getS_price())); li3.addAll(Arrays.asList(al.getFl().getF_name() + " " + al.getFl().getF_remark() + " " + al.getSp().getF_id() + " " + al.getSp().getS_name() + " " + al.getSp().getS_price())); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (stmt != null) stmt.close(); if (rs != null) rs.close(); if (conn != null) conn.close(); } catch (Exception ex) { ex.printStackTrace(); } } return li2; }