1.获取某个前端页面的内容
/** * 获得url页面信息 * * @param url * 网址 * @return 字符串 * @throws IOException */ public static StringBuffer getUrl(String url) throws IOException { BufferedReader in = null; StringBuffer stb = new StringBuffer(); try { URL u = new URL(url); System.out.println("URL:" + url); in = new BufferedReader(new InputStreamReader(u.openStream(), "utf-8")); String str; while ((str = in.readLine()) != null) { stb.append(str); } } catch (Exception e) { e.printStackTrace(); } finally { in.close(); } return stb; }
2.获取项目的访问路径
/** * 获得项目访问路径 * * @param request * @return */ public static String getItemUrl(HttpServletRequest request) { String path = request.getContextPath(); itemUrl = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; return getItemUrl(); }
以下为我常用的一些方法
/** * json 反序列化 方法。把 一个json字符串，反序列化成 指定类型的对象 * * @param <T> * @return */ public static <T> T JsonDeserialize(String jsonAsString, Class<T> pojoClass) throws JsonMappingException, JsonParseException, IOException { ObjectMapper objectMapper = new ObjectMapper(); return objectMapper.readValue(jsonAsString, pojoClass); } /** * 将对象转成jsonString形式 */ public static <T> JSONObject JsonSerialize(T t) { JSONObject jsonObject = JSONObject.fromObject(t); return jsonObject; } /** * 读取Request的内容 * * @param Request * @return */ public static String ReadRequestContent(HttpServletRequest Request) { StringBuilder sb = new StringBuilder(); String line = null; try { BufferedReader in = new BufferedReader(new InputStreamReader( Request.getInputStream())); while ((line = in.readLine()) != null) { sb.append(line); } } catch (IOException e) { e.printStackTrace(); } String result = sb.toString(); return result; } /** * 取得当前时间戳（精确到秒） * * @return */ public static String timeStamp() { long time = System.currentTimeMillis(); String t = String.valueOf(time / 1000); return t; } /** * 生成随机串，随机串包含字母或数字 * * @return 随机串 */ public static String getnonceStr() { String val = ""; Random random = new Random(); int length = random.nextInt(31); if (length < 10) { length = 11; } for (int i = 0; i < length; i++) { // 输出字母还是数字 String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num"; // 字符串 if ("char".equalsIgnoreCase(charOrNum)) { // 取得大写字母还是小写字母 int choice = random.nextInt(2) % 2 == 0 ? 65 : 97; val += (char) (choice + random.nextInt(26)); } else if ("num".equalsIgnoreCase(charOrNum)) { // 数字 val += String.valueOf(random.nextInt(10)); } } return val; } /** * 将字节数组转化成字符串 */ public static String byte2str(byte[] array) { StringBuffer hexstr = new StringBuffer(); String shaHex = ""; for (int i = 0; i < array.length; i++) { shaHex = Integer.toHexString(array[i] & 0xFF); if (shaHex.length() < 2) { hexstr.append(0); } hexstr.append(shaHex); } return hexstr.toString(); } /** * 处理http GET.POST请求，返回数据 * * 请求的url地址http GET成功后返回的数据，失败抛WebException异常 */ public static JSONObject httpsRequest(String requestUrl, String requestMethod, String outputStr) { JSONObject jsonObject = null; try { // 创建SSLContext对象，并使用我们指定的信任管理器初始化 TrustManager[] tm = { new MyX509TrustManager() }; SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE"); sslContext.init(null, tm, new java.security.SecureRandom()); // 从上述SSLContext对象中得到SSLSocketFactory对象 SSLSocketFactory ssf = sslContext.getSocketFactory(); URL url = new URL(requestUrl); HttpsURLConnection conn = (HttpsURLConnection) url.openConnection(); conn.setSSLSocketFactory(ssf); conn.setDoOutput(true); conn.setDoInput(true); conn.setUseCaches(false); // 设置请求方式（GET/POST） conn.setRequestMethod(requestMethod); // 当outputStr不为null时向输出流写数据 if (null != outputStr) { OutputStream outputStream = conn.getOutputStream(); // 注意编码格式 outputStream.write(outputStr.getBytes("UTF-8")); outputStream.close(); } // 从输入流读取返回内容 InputStream inputStream = conn.getInputStream(); InputStreamReader inputStreamReader = new InputStreamReader( inputStream, "utf-8"); BufferedReader bufferedReader = new BufferedReader( inputStreamReader); String str = null; StringBuffer buffer = new StringBuffer(); while ((str = bufferedReader.readLine()) != null) { buffer.append(str); } // 释放资源 bufferedReader.close(); inputStreamReader.close(); inputStream.close(); inputStream = null; conn.disconnect(); String o = buffer.toString(); if (o.contains("[CDATA")) { o = o.replace("<![CDATA[", "").replace("]]>", ""); XMLSerializer xmlSerializer = new XMLSerializer(); JSON json = xmlSerializer.read(o); return (JSONObject) json; } jsonObject = JSONObject.fromObject(o); } catch (ConnectException ce) { ce.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } return jsonObject; } /** * java对象转化成xml字符串 * * java对象实例 String xml字符串 */ private static XStream xstream = new XStream(new XppDriver() { public HierarchicalStreamWriter createWriter(Writer out) { return new PrettyPrintWriter(out) { // 对所有的xml节点都增加cdata标记 boolean cdata = true; public void starNode(String name, Class clazz) { super.startNode(name, clazz); } protected void writeText(QuickWriter writer, String text) { if (cdata) { writer.write("<![CDATA["); writer.write(text); writer.write("]]>"); } else { writer.write(text); } } }; } }); public static String serializeToXml(Object obj) { PayData paydata = (PayData) obj; xstream.alias("xml", PayData.class); return xstream.toXML(paydata); } public static String serializeToXml1(Object obj) { com.pb.action.weixinApp.util.PayData paydata1 = (com.pb.action.weixinApp.util.PayData) obj; xstream.alias("xml", com.pb.action.weixinApp.util.PayData.class); return xstream.toXML(paydata1); } /** * xml对象转化成json * * @param obj * java对象实例 * @return String xml字符串 */ public static HashMap<String, String> parseXML(HttpServletRequest request) { HashMap<String, String> map = new HashMap<String, String>(); SAXReader reader = new SAXReader(); Document doc; try { doc = reader.read(request.getInputStream()); // 得到xml的根节点 Element root = doc.getRootElement(); recursiveParseXML(root, map); } catch (DocumentException | IOException e) { e.printStackTrace(); } return map; } private static void recursiveParseXML(Element root, HashMap<String, String> map) { // 得到根節點的子節點列表 List<Element> elementlist = root.elements(); // 判斷子元素有沒有列表 if (elementlist.size() == 0) { map.put(root.getName(), root.getTextTrim()); } else { for (Element e : elementlist) { recursiveParseXML(e, map); } } } /** * 将传入xml字符串转化为java对象 * * @param xmlstr * @param cls * xml对应的class类 * @return T xml对应的class类的实例对象 调用的方法实例：PersonBean * person=XmlUtil.toBean(xmlStr, PersonBean.class); */ public <T> T deSerizalizeFromXml(String xmlstr, Class<T> cls) throws Exception { // 注意：不是new Xstream();否则报错：java.lang.NoClassDefFoundError: // org/xmlpull/v1/XmlPullParserFactory XStream xstream = new XStream(new DomDriver()); xstream.processAnnotations(cls); T obj = (T) xstream.fromXML(xmlstr); return obj; } /** * 从Request对象中获得客户端IP，处理了HTTP代理服务器和Nginx的反向代理截取了ip * * @param request * @return ip */ public static String getIp2(HttpServletRequest request) { String ip = request.getHeader("X-Forwarded-For"); if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) { // 多次反向代理后会有多个ip值，第一个ip才是真实ip int index = ip.indexOf(","); if (index != -1) { return ip.substring(0, index); } else { return ip; } } ip = request.getHeader("X-Real-IP"); if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) { return ip; } return request.getRemoteAddr(); } /** * 获取编码后的url * * @param source * @return */ public static String urlEncodeUTF8(String source) { String result = source; try { result = URLEncoder.encode(source, "utf-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return result; } /** * 获取当前的格式化时间 * * @param source * @return */ public static String simpleTime() { SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-dd HH:mm:ss"); String time = sdf.format(new Date()); return time; }
