public class ParamUtils { private static Logger logger = LoggerFactory.getLogger(ParamUtils.class); private static Gson gson = new Gson(); private static View viewer = new View(); public static String getParam(HttpServletRequest request) { String param = null; if ("GET".equals(request.getMethod())) { param = request.getParameter("param"); } else { param = getPostParm(request); } return cleanXSS(param); } private static String getPostParm(HttpServletRequest request) { StringBuffer jb = new StringBuffer(); String line = null; BufferedReader reader = null; try { reader = request.getReader(); if (!reader.ready()) return jb.toString(); while ((line = reader.readLine()) != null) jb.append(line); } catch (IllegalStateException e){ logger.error("getReader 被调用了两次的原因么" ); } catch (Exception e) { logger.error("读取请求参数出错", e); } finally { if (reader != null) { try { reader.close(); } catch (Exception e) { logger.error("BufferedReader 关闭有误", e); } } } return jb.toString(); } public static String encodeURI(String uri) { try { return URLEncoder.encode(uri, "UTF-8"); } catch (Exception e) { return uri; } } //切割一个范围 "limit":"1,10" public static int[] parseLimit(String limit) { String[] strings = limit.split(","); int[] result = new int[2]; result[0] = Integer.parseInt(strings[0]); result[1] = Integer.parseInt(strings[1]); return result; } private static String cleanXSS(String value) { if (value == null) { return null; } value = value.replaceAll("eval", ""); value = value.replaceAll("<script>", ""); value = value.replaceAll("<javascript>", ""); return value; } public static void errorParam(String info, HttpServletResponse resp) { ResultBean resultBean = new ResultBean(); resultBean.setCode(getErrorCode()); resultBean.setInfo(info); String data = gson.toJson(resultBean); viewer.viewString(data, resp); } public static ResultBean errorParamResultBean(String info) { ResultBean resultBean = new ResultBean(); resultBean.setCode(getErrorCode()); resultBean.setInfo(info); return resultBean; } public static int getErrorCode() { return 0; } public static int getSuccessCode() { return 1; } public static String getStatusKey() { return "code"; } public static String getDataKey() { return "info"; } } 有的接口返回值为空，但是仍然希望能够输出内容，此时可以使用response对象输出内容到网页
public class View { private Logger logger = LoggerFactory.getLogger(View.class); private static Gson gson = new Gson(); private static final JsonFactory jsonFactory = new JsonFactory(); public void setHttpServletResponse(HttpServletResponse response) { response.setCharacterEncoding("UTF-8"); response.setHeader("Access-Control-Allow-Origin", "http://angular.js"); response.setHeader("Access-Control-Allow-Methods", "GET,PUT,POST,DELETE,OPTIONS"); response.setHeader("Access-Control-Allow-Credentials", "true"); response.setContentType("application/json"); } public void writeResult(String result, HttpServletResponse response) { PrintWriter writer = null; try { writer = response.getWriter(); if (result == null) { ResultBean resultBean = new ResultBean(); resultBean.setCode(0); resultBean.setMsg("请求出错"); writer.write(gson.toJson(resultBean)); writer.flush(); } else { writer.write(result); writer.flush(); } } catch (IOException e) { logger.error("", e); } finally { writer.close(); } } public void viewString(String str, HttpServletResponse response) { // 1k以下数据显示 if (str == null || str.length() < 1024 * 1) logger.info("结果:" + str); setHttpServletResponse(response); writeResult(str, response); } } 文章来源: 常用工具类（三）：获取接口参数与统一返回结果