ip地址点分十进制转长整型

src/brainstorming/IPDecodeAndEncode.java

@@ -0,0 +1,41 @@
+package brainstorming;
+
+import java.util.stream.Stream;
+
+public class IPDecodeAndEncode {
+    private long l;
+    public static void main(String[] args) {
+        IPDecodeAndEncode testDmeo = new IPDecodeAndEncode();
+        testDmeo.decode("192.168.2.1");
+        System.out.println(testDmeo.l);
+        System.out.println(testDmeo.encode(3232236033L));
+    }
+
+
+    public IPDecodeAndEncode() {
+        this.l = 0L;
+    }
+
+    public void decode(String ipStrs){
+        this.l = 0L;
+        Stream.of(ipStrs.split("\\.")).forEach(this::ipUp);
+    }
+
+    private final void ipUp(final String ipStr){
+        long sum = Long.parseLong(ipStr);
+        l = (l << 8) + Long.parseLong(ipStr);
+    }
+
+    public String encode(long ipNo){
+        StringBuffer sb = new StringBuffer();
+        while (ipNo != 0){
+            if (ipNo >>> 8 == 0){
+                sb.insert(0, ipNo & 255);
+            }else {
+                sb.insert(0, "." + (ipNo & 255));
+            }
+            ipNo = ipNo >>> 8;
+        }
+        return sb.toString();
+    }
+}