关于java截取字符串

关于java截取字符串 所在位置:论坛首页 — 关于JAVA截取字符串 打印本页 保存页面 关于JAVA截取字符串 举了例子吧,有这样几个字符串: String str1 = "dsaf3d&channelid=34567&dsfghh3"; String str2 = "channelid=87654&sdf452"; String str3 = "channelid=76543&channelid=76543"; channelid=的数字都是五位. 现在我想有这样一种方法,可以取得channelid=后面的那五位数字. 还望大家指教 回复内容 【liujun999999】: public class Demo1{ public static void main(String args[]){ String str3 = "channelid=76543&channelid=76543"; String s[] = str3.split("&"); String s2 = ""; for(String k:s){ if(k.indexOf("channelid")!= -1){ s2 = k; break; } } s = s2.split("="); System.out.println(s[1]); } } 【AWUSOFT】: 一定是五位, String str2 = "channelid=87654&sdf452"; String strFFF =str2.subString(str2.indexOf("channelid")+"channelid".length()+1,5); 【grant999】: String str1 = "dsaf3d&channelid=34567&dsfghh3"; String p="channelid=\\d{5}"; Pattern pp=Pattern.compile(p); Matcher m=pp.matcher(str1); while(m.find()){ System.out.println(m.group()); } 【tntvip】: 对一定是5位 【chenyifei211】: package test1; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Test14 { /** * @param args */ public static void main(String[] args) { // TODO 自动生成方法存根 String st = "dsaf3d&channelid=34567&dsfghh3"; Pattern p=Pattern.compile("channelid=(\\d{5})"); Matcher m=p.matcher(st); StringBuffer sb=new StringBuffer(); while(m.find()){ sb=sb.append(m.group(1)); } System.out.println(sb); } } 【bao110908】: import java.util.ArrayList; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern; public class T1 { public static void main(String[] args) { List strList = new ArrayList(); strList.add("dsaf3d&channelid=34567&dsfghh3"); strList.add("channelid=87654&sdf452"); strList.add("channelid=76543&channelid=76543"); Pattern pattern = Pattern.compile("(=)(\\d{5})"); List numList = new ArrayList(); for (String str : strList) { findPattern(str, pattern, 2, numList); } // 输出结果 for (String num : numList) { System.out.println(num); } } /** * 从字符串中匹配指定的模式 * @param str 需要被查找的字符串 * @param pattern 匹配的模式 * @param index 需要匹配的结果在模式中的组位置 * @param list 保存匹配到的结果 */ private static void findPattern(String str, Pattern pattern, int index, List list) { Matcher matcher = pattern.matcher(str); while (matcher.find()) { list.add(matcher.group(index)); } } } 【joejoe1991】: package jsp; import java.util.regex.*; public class test { public static void main(String[] args) { String str1 = "dsaf3d&channelid=34567&dsfghh3"; String str2 = "channelid=87654&sdf452"; String str3 = "channelid=76543&channelid=76543"; String[] strarr=new String[3]; strarr[0]=str1; strarr[1]=str2; strarr[2]=str3; Pattern pattern=Pattern.compile("=(\\d+)"); for (int i=0;i<3;i++) { Matcher matcher=pattern.matcher(strarr[i]); while(matcher.find()) { System.out.println(matcher.group(1)); } } } } 【AWUSOFT】: 错了耶，应该是这样的 String str2 = "channelid=87654&sdf452"; int index = str2.indexOf("channelid")+"channelid".length()+1; String strFFF =str2.substring(index,index+5); 【AWUSOFT】: String.substring(index,index+5);--(开始下标，结束下标) 一直想着(开始下标，截取长度); 【tntvip】: AWUSOFT的方法最简单实用,我发分发给他.