简易工具类笔记

来源：互联网发布：期货tick数据下载编辑：程序博客网时间：2024/05/29 12:34

1. js读写cookie

2. java获取ip

3. commons-lang.jar中的工具类简析

4.下载

1. js读写cookie

/* 读写cookie函数定义 begin */function getCookie(c_name) {if (document.cookie.length > 0) {c_start = document.cookie.indexOf(c_name + "=");if (c_start != -1) {c_start = c_start + c_name.length + 1;c_end = document.cookie.indexOf(";", c_start);if (c_end == -1)c_end = document.cookie.length;return decodeURIComponent(document.cookie.substring(c_start, c_end));}}return "";}function setCookie(c_name, value, expiredays) {var exdate = new Date();exdate.setDate(exdate.getDate() + expiredays);document.cookie = c_name + "=" + encodeURIComponent(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString());}/* 读写cookie函数定义 end */

2. java获取ip

public static String getIpAddr(HttpServletRequest request) {      String ip = request.getHeader("x-forwarded-for");      if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {          ip = request.getHeader("Proxy-Client-IP");      } else {        if (ip.indexOf(",") != -1) {              ip = ip.substring(0,ip.indexOf(","));          }      }      if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {          ip = request.getHeader("WL-Proxy-Client-IP");      }      if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {          ip = request.getRemoteAddr();      }      return ip;  }

3. commons-lang.jar中的工具类简析

3.1 StringUtil类

isEmpty(String str)方法。null和空字符串""返回true，其他返回false。

isNotEmpty(String str)方法。与isEmpty(String str)返回结果相反。

isBlank(String str)方法。null、空字符串""和只包含空格的字符串" "返回true，其他返回false。

isNotBlank(String str)方法。与isBlank(String str)方法返回结果相反。

3.2 ExceptionUtils类

getFullStackTrace(Throwable t)方法。获得格式化的完整异常堆栈字符串。

ExceptionUtils类还提供getMessage(Throwable t)等多个实用方法。

4.下载

//下载附件public void downloadAtt(HttpServletRequest request, HttpServletResponse response) throws IOException{response.reset();response.setHeader("Content-Disposition", "attachment;filename=\"" + new String((name.getBytes(), "iso8859-1") + "\"");response.setContentType("application/x-download;charset=UTF-8");ServletOutputStream out = response.getOutputStream();out.write(new byte[]{});out.flush();out.close();}

0 0