JAVA中使用正则匹配json中指定字段的值

{"page_size":0,"page_index":0,"page_count":0,"has_next":false,"datas":null,"code":0,"issuccess":true,"msg":null}

String regex="\"code\":(.*?),\"issuccess\"";//使用非贪婪模式
Matcher matcher=Pattern.compile(regex).matcher(jsonString);
while(matcher.find())
{
String ret=matcher.group(1);
if("0".equals(ret)){
json2dto = new ObjectMapper().readValue(jsonString, JstOrdersOutQueryDTO.class);
}else{
throw new Exception("没有成功得到json信息，请检查！！");
}
}

总结：