微服务下两种来源读取.json文件并解析

痛定思痛。 2022-02-22 15:52 274阅读 0赞

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第一种方式：读取本地的json文件

Resource resource;
    resource = new ClassPathResource("static" + File.separator + "script" + File.separator + "pub"+ File.separator + "pub_close_browser_no_flow.json");
    InputStream in = resource.getInputStream();
    
    String jsonTxt = inputStream2String(in);

将流中的数据转为字段串

public String inputStream2String(InputStream in) throws IOException {
    	StringBuffer out = new StringBuffer();
    	byte[] b = new byte[4096];
    	for (int n; (n = in.read(b)) != -1;) {
    		out.append(new String(b, 0, n));
    	}
    	return out.toString();
    }

注：File.separator

>     /**
>      * The system-dependent default name-separator character.  This field is
>      * initialized to contain the first character of the value of the system
>      * property <code>file.separator</code>.  On UNIX systems the value of this
>      * field is <code>'/'</code>; on Microsoft Windows systems it is <code>'\\'</code>.
>      *
>      * @see     java.lang.System#getProperty(java.lang.String)
>      */

--------------------

第二种方式：读取配置中心的json文件

String ip = ServerUtils.getServerIp(eurekaClient,configCenterServer);
    String url = "http://" + ip + ":" + httpURLForScript;
    String jsonTxt = HttpTemplateUtil.httpGet(url + "pub/pub_close_browser_no_flow.json");
    jsonTxt = getScriptByParam(jsonTxt, explorerHandle);

ServerUtils是获取注册中心的工具类

public class ServerUtils {
    
        public static String getServerIp(EurekaClient eurekaClient, String appName){
            Application application = eurekaClient.getApplication(appName);
            List<InstanceInfo> instanceInfoList = application.getInstances();
            log.info("获取的服务的IP的地址：" + instanceInfoList.get(0).getIPAddr());
            return instanceInfoList.get(0).getIPAddr();
        }
    }

最关键的一步，将字段串进行解析，解析出需要的集合

Type type = new TypeToken<List<T>>() {
    }.getType();
    List<T> tList = gson.fromJson(jsonTxt, type);

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