java使用正则表达式的方法从json串儿,取想要的value值
例子1:
现有json:
({"code":"200","json":["111"],"message":"true"})
从中提取json的value数据。
直接上代码如下:
import java.util.ArrayList; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Snippet { public static void main(String[] args) { ArrayList json = new ArrayList(); json.add("111"); User user = new User(); user.setJson(json); user.setCode("200"); user.setMessage("true"); String string = "(" + JSON.toJSONString(user) + ")"; // String regex = "\"json\":(.*?),\"message\"";// 使用非贪婪模式! Pattern pattern = Pattern.compile("\\[\"(.*?)\"\\]"); Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println(matcher.group(1)); } } }
例子2:
String str = "我是[001]真心求救的[002],你能帮帮我吗"; Pattern pattern = Pattern.compile("\\[(.*?)\\]"); Matcher matcher = pattern.matcher(str); while(matcher.find()){ System.out.println(matcher.group(1)); }
例子3:
public static void main(String[] args) { String parse="[{CSTM_NO:\"11118\",CSTM_NAME:\"广东XX电力有限公司\",FIX_GNL:\"111810158\",FIX_ACC:\"D201306070003\",OP_FLAG:\"正常\",BUSS_KIND_NAME:\"三个月定期存款\",BAL:\"25,178,750.00\",AVAL_BAL:\"25,178,750.00\",OP_DATE:\"2013-06-07\",DUE_DATE:\"2013-12-07\",ROWNUM_:1,idx:0},{CSTM_NO:\"11118\",CSTM_NAME:\"广东XX电力有限公司\",FIX_GNL:\"111810158\",FIX_ACC:\"D201306070002\",OP_FLAG:\"正常\",BUSS_KIND_NAME:\"三个月定期存款\",BAL:\"25,178,750.00\",AVAL_BAL:\"25,178,750.00\",OP_DATE:\"2013-06-07\",DUE_DATE:\"2013-12-07\",ROWNUM_:3,idx:2},{CSTM_NO:\"11118\",CSTM_NAME:\"广东XX电力有限公司\",FIX_GNL:\"111810158\",FIX_ACC:\"D201306070005\",OP_FLAG:\"正常\",BUSS_KIND_NAME:\"三个月定期存款\",BAL:\"25,178,750.00\",AVAL_BAL:\"25,178,750.00\",OP_DATE:\"2013-06-07\",DUE_DATE:\"2013-12-07\",ROWNUM_:4,idx:3}]"; String regex="FIX_ACC:(.*?),OP_FLAG";//别忘了使用非贪婪模式! Matcher matcher=Pattern.compile(regex).matcher(parse); while(matcher.find()) { String ret=matcher.group(1); System.out.println(ret); } }
总结:
(.*?)这个拿出来,左边括号左边是左边界,右边括号右边是右边界,选对后直接匹配,即可拿到
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