download：Spring Cloud Alibaba 大型互联网领域多场景最佳实践
聚焦Spring Cloud Alibaba，深入剖析5大核心组件原理，并结合真实电商微服务架构，讲透框架在多场景下的最佳实践，助力全面提升微服务实战能力，轻松应对微服务领域的各种技术难题。
熟悉java web开发、会使用maven 和spring框架
对于springboot 有一定的了解
技术储备要求
Jdk 1.8、Spring Cloud Hoxton.SR8、Spring Cloud Hoxton.SR8、Springcloud Hoxton.SR8
SpringCloudAlibaba 2.2.5 RELEASE、Nacos 1.4.1、Sentinel 1.8.0
public class SystemInfoUtils {
public static int getRunningAppProcesses(Context context) {// 得到当前系统内运行的app进程数量
ActivityManager am = (ActivityManager) context
.getSystemService(Context.ACTIVITY_SERVICE);
List<RunningAppProcessInfo> appInfos = am.getRunningAppProcesses();
return appInfos.size();
}
public static List<HashMap<String, Object>> getAppInfo(Context context) {// 得到非系统应用的app信息
List<HashMap<String, Object>> appInfos = new ArrayList<HashMap<String, Object>>();
HashMap<String, Object> map = null;
List<PackageInfo> packages = context.getPackageManager()
.getInstalledPackages(0);// 参数传入0表示过滤权限，因为可能有的手机不让你获取应用信息
for (PackageInfo temp : packages) {
if ((temp.applicationInfo.flags & temp.applicationInfo.FLAG_SYSTEM) == 0) {
// 非系统应用
// 得到应用的名称
String appName = temp.applicationInfo.loadLabel(
context.getPackageManager()).toString();
// 得到应用图标
Drawable appIcon = temp.applicationInfo.loadIcon(context
.getPackageManager());
// 得到应用最后一次更新的时间
long lastUpdateTime = temp.lastUpdateTime;
// 得到应用的包名
String packageName = temp.packageName;
// 得到应用的版本信息
String versionName = temp.versionName;
map = new HashMap<String, Object>();
map.put("appName", appName);
map.put("appIcon", appIcon);
map.put("lastUpdateTime", lastUpdateTime);
map.put("packageName", packageName);
map.put("versionName", versionName);
appInfos.add(map);// 把应用信息加入集合中返回
map = null;
} else {
// 系统应用
}
}
return appInfos;
}
// 获取sd卡容量
public static String getSdSize(Context context) {
String totalStr = null, availStr = null;
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {// 判断是否检测到sd卡
File path = Environment.getExternalStorageDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSizeLong();
long availableBlocks = stat.getAvailableBlocksLong();
long totalBlocks = stat.getBlockCountLong();
long totalSize = blockSize * totalBlocks;
long availSize = blockSize * availableBlocks;
totalStr = Formatter.formatFileSize(context, totalSize);
availStr = Formatter.formatFileSize(context, availSize);
} else
Toast.makeText(context, "没有检测到SD卡，请检查是否正确插入", Toast.LENGTH_SHORT)
.show();
return "SD卡总容量为:" + totalStr + "可用为:" + availStr;
}
// 获取手机内存
public static String getRomSave(Context context) {
String totalStr = null, availStr = null;
File path = Environment.getDataDirectory();
StatFs stat = new StatFs(path.getPath());// 得到手机内存的路径
long blockSize = stat.getBlockSizeLong();
long availableBlocks = stat.getAvailableBlocksLong();
long totalBlocks = stat.getBlockCountLong();
long totalSize = blockSize * totalBlocks;
long availSize = blockSize * availableBlocks;
totalStr = Formatter.formatFileSize(context, totalSize);
availStr = Formatter.formatFileSize(context, availSize);
return "手机内存总大小为:" + totalStr + "可用空间为:" + availStr;
}
}
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