正则匹配json数据

正则匹配json数据 属性

  
     public static void main(String[] args) {
  //  String json="{\"body\":{\"data\":{\"phoneticSpelling\":\"4148596365299634756\"},\"errno\":0,\"qqaa\":\"success\",\"failMsg\":\"饿了么004门店编码不存在\"},\"cmd\":\"resp.order.create\",\"sign\":\"MD5:4c9f9a797aec3a63b3b7c1b17953fdee\",\"source\":\"47121860\",\"ticket\":\"701439a9-b9c6-491c-a915-9ecb7d3a1202\",\"timestamp\":1650753613,\"version\":\"3\"}";
   // String json="\"{\\\"body\\\":{\\\"data\\\":{\\\"source_order_id\\\":\\\"4537167234017566453juː\\\"},\\\"errno\\\":0,\\\"error\\\":\\\"success\\\",\\\"failMsg\\\":\\\"饿了么订单号4537167234017566453已存在\\\"},\\\"cmd\\\":\\\"resp.order.create\\\",\\\"sign\\\":\\\"juː\\\",\\\"source\\\":\\\"47121860\\\",\\\"ticket\\\":\\\"dd368296-7321-4cc1-bba8-e271962f7b82\\\",\\\"timestamp\\\":1650766806,\\\"version\\\":\\\"3\\\"}\"";
  
    	 String json="{\n" + 
    	 		"    \"id\": \"you\",\n" + 
    	 		"    \"metadata\": {\n" + 
    	 		"        \"operation\": \"retrieve\",\n" + 
    	 		"        \"provider\": \"Oxford University Press\",\n" + 
    	 		"        \"schema\": \"RetrieveEntry\"\n" + 
    	 		"    },\n" + 
    	 		"    \"results\": [\n" + 
    	 		"        {\n" + 
    	 		"            \"id\": \"you\",\n" + 
    	 		"            \"language\": \"en-gb\",\n" + 
    	 		"            \"lexicalEntries\": [\n" + 
    	 		"                {\n" + 
    	 		"                    \"entries\": [\n" + 
    	 		"                        {\n" + 
    	 		"                            \"pronunciations\": [\n" + 
    	 		"                                {\n" + 
    	 		"                                    \"audioFile\": \"https://audio.oxforddictionaries.com/en/mp3/ewe_gb_1.mp3\",\n" + 
    	 		"                                    \"dialects\": [\n" + 
    	 		"                                        \"British English\"\n" + 
    	 		"                                    ],\n" + 
    	 		"                                    \"phoneticNotation\": \"IPA\",\n" + 
    	 		"                                    \"phoneticSpelling\": \"juː\"\n" + 
    	 		"                                }\n" + 
    	 		"                            ]\n" + 
    	 		"                        }\n" + 
    	 		"                    ],\n" + 
    	 		"                    \"language\": \"en-gb\",\n" + 
    	 		"                    \"lexicalCategory\": {\n" + 
    	 		"                        \"id\": \"pronoun\",\n" + 
    	 		"                        \"text\": \"Pronoun\"\n" + 
    	 		"                    },\n" + 
    	 		"                    \"text\": \"you\"\n" + 
    	 		"                }\n" + 
    	 		"            ],\n" + 
    	 		"            \"type\": \"headword\",\n" + 
    	 		"            \"word\": \"you\"\n" + 
    	 		"        }\n" + 
    	 		"    ],\n" + 
    	 		"    \"word\": \"you\"\n" + 
    	 		"}";
    	 // json=json.replaceAll("\\\\","");
    System.out.println("json:"+json);
    System.out.println("getField:"+searchMatch(json,"phoneticSpelling",0));
}
   
    
    /**
     * 正则表达式 查找匹配的字符串
     * @param json 字符串
     * @param word 正则表达式
     * @param index 提取正则匹配到字符串的哪一部分 0整串，1第一个()的内容，2第二个()...
     * @return 匹配值列表
     */
    public static String searchMatch(String json, String word,int index) {
    	//替换转义符
        if(!"".equals(json)) {
        	json = json.replaceAll("\\\\", "");
        }
        String value = "";
        Pattern pattern = Pattern.compile("(?<=(\"" + word+"\": ))\"(.+?)\"");//"(?<=(\"" + word+"\":))\"(\\w+)?\""
        Matcher matcher = pattern.matcher(json);
        if (matcher.find()) {
            matcher.reset();
            while (matcher.find()) {
                System.out.println("匹配到的整串-->" + matcher.group(0));
                value = matcher.group(index);
                System.out.println("整串中指定的子串-->" + value);
                 break;
            }
        }
        return value;
    }
    
    
    /**
     * json数据截取
     * @param jsonStr
     * @param fieldName
     * @return
     */
    private static String getFieldValueFromJsonStr(String jsonStr, String fieldName) {
        //替换转义符
        if(!"".equals(jsonStr)) {
            jsonStr = jsonStr.replaceAll("\\\\", "");
        }

        List<String> fieldValues = new ArrayList<>();
        String regex = "(?<=(\"" + fieldName + "\":))\"(.+?)(?=[\\,|\\}])";//"(?<=(\"" + fieldName + "\":)).*?(?=(\\,))";
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(jsonStr);
        while (matcher.find()) {
            if (!"".equals(matcher.group().trim())) {
                fieldValues.add(matcher.group().trim());
            }
        }
        if(!fieldValues.isEmpty()) {
            return fieldValues.get(0);
        }else{
            return null;
        }
    }