java 二维码带图片生成

package com.qrcode.utils; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.lang.reflect.Array; import java.util.Collection; import java.util.Date; import java.util.Map; import javax.servlet.http.HttpServletRequest; public class Helper { public static final int AIR_FILTER_ID = 698 ; public static final int PLACE_BUY = 0 ; public static final String YYYY_MM_DD_HH_MM_SS_WORD = "yyyy年MM月dd日 HH时mm分ss秒" ; public static final String YYYY_MM_DD_WORD = "yyyy年MM月dd日" ; public static final String YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss" ; public static final String YYYY_MM_DD = "yyyy-MM-dd" ; public static final String WXOPENIDKEY = "WXOPENIDKEY"; public static final String WXNEWTHEOWNER = "WXNEWTHEOWNER"; public static final String ACCESS_TOKEN = "ACCESS_TOKEN"; public static final String ACCESS_TOKEN_FILE = "access_token.so"; public static final String SERVER_HOT_LINE = "4006562230"; public static String getBasepath(HttpServletRequest request) { String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; return basePath ; } /** * 判断String类型是否为空 * */ public static boolean isNull(String value){ if(value == null){ return true ; } if(value.trim().length() == 0){ return true ; } return false ; } public static boolean isNull(Object value){ if(value == null){ return true ; } if(value.getClass().isArray()){ if(Array.getLength(value) == 0){ return true ; } } if(value instanceof Collection<?>){ Collection<?> collection = (Collection<?>) value ; if(collection.isEmpty()){ return true ; } }else if(value instanceof Map<?, ?>){ Map<?, ?> map = (Map<?, ?>) value ; if(map.isEmpty()){ return true ; } }else if(value instanceof String){ String string = (String) value ; return isNull(string) ; } return false; } public static String checkNull(Object val){ if(val == null){ return "" ; } return val.toString().trim() ; } public static int toInt(Object value){ if(value == null){ return 0 ; } if(value instanceof Number){ Number number = (Number) value ; return number.intValue() ; } try { return Integer.parseInt(value.toString()) ; } catch (Exception e) { return 0; } } public static String format(int num , int length){ StringBuffer buffer = new StringBuffer(Integer.toString(num)); while(buffer.length() < length){ buffer.insert(0, "0") ; } return buffer.toString(); } public static String readFile(){ try { File f = new File(ACCESS_TOKEN_FILE); if(!f.exists()){ try { f.createNewFile(); System.out.println(f.getAbsolutePath()); } catch (IOException e) { } } InputStreamReader br1 = new InputStreamReader(new FileInputStream(f)); BufferedReader br2 = new BufferedReader(br1); String s = ""; String str = br2.readLine(); while(str!=null){ //System.out.println(str); s = s + str; str = br2.readLine(); } br2.close(); br1.close(); return s; } catch (FileNotFoundException e) { return ""; } catch (IOException e) { return ""; } } public static void writeFile(String text){ try { File f = new File(ACCESS_TOKEN_FILE); if(!f.exists()){ try { f.createNewFile(); } catch (IOException e) { } } OutputStreamWriter bw1 = new OutputStreamWriter(new FileOutputStream(f)); BufferedWriter bw2 = new BufferedWriter(bw1); bw2.write(text); bw2.flush(); bw2.close(); bw1.close(); } catch (FileNotFoundException e) { } catch (IOException e) { } } public static java.sql.Timestamp geTimestamp(){ return new java.sql.Timestamp(new Date().getTime() ) ; } public static void showMessage(javax.servlet.http.HttpServletRequest req,javax.servlet.http.HttpServletResponse resp , String msg , String button){ req.setAttribute("message", msg ) ; req.setAttribute("button", button ) ; String href = Helper.getBasepath(req) + req.getServletPath() + "?" + Helper.checkNull(req.getQueryString() ) ; req.setAttribute("href", href ) ; forword(req , resp , "messages/messages.jsp" ) ; } public static void forword(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response,String page){ try { page = page.startsWith("/") ? page : "/" + page ; request.getRequestDispatcher( page ).forward(request, response ) ; } catch (Exception e) { } } public static void sendRedirect(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response,String page){ try { page = page.startsWith("/") ? page : "/" + page ; String contextPath = request.getContextPath() ; if(!"/".equals(contextPath)){ page = contextPath + page ; } response.sendRedirect(page); } catch (Exception e) { } } public static boolean isPC(HttpServletRequest request){ try{ String user_agent = request.getHeader("user-agent") ; if(user_agent == null){ return false ; } if(user_agent.indexOf("Opera") != -1){ if(user_agent.indexOf("Android") != -1){ return false ; } } if(user_agent.indexOf("WPDesktop") != -1){ return false ; } if(user_agent.indexOf("Nokia") != -1){ return false ; } if(user_agent.indexOf("iPad") != -1){ return true ; } if(user_agent.indexOf("iPhone") != -1){ return false ; } if(user_agent.indexOf("Mobile") != -1){ return false ; } if(user_agent.indexOf("WAP") != -1){ return false ; } }catch(Exception e){ } return true ; } }