--- /dev/null	2018-06-17 23:18:20.806999507 +0800
+++ new/src/share/classes/jdk/jfr/internal/cmd/PrintCommand.java	2019-01-29 10:59:51.239216799 +0800
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.jfr.internal.cmd;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Deque;
+
+final class PrintCommand extends Command {
+    @Override
+    public String getName() {
+        return "print";
+    }
+
+    @Override
+    public String getOptionSyntax() {
+        return "[--xml|--json] <file>";
+    }
+
+    @Override
+    public String getDescription() {
+        return "Print contents of a recording file (.jfr)";
+    }
+
+    @Override
+    public void displayOptionUsage() {
+        println("  --xml    Print a recording in XML format");
+        println();
+        println("  --json   Print a recording in JSON format");
+        println();
+        println("  <file>   Location of the recording file (.jfr) to print");
+    }
+
+    @Override
+    public void execute(Deque<String> options) {
+        if (options.isEmpty()) {
+            userFailed("Missing file");
+        }
+        ensureMaxArgumentCount(options, 2);
+
+        Path file = Paths.get(options.removeLast());
+
+        ensureFileExist(file);
+        ensureJFRFile(file);
+        ensureMaxArgumentCount(options, 1);
+
+        String format = "--pretty";
+        if (!options.isEmpty()) {
+            format = options.remove();
+        }
+        try (PrintWriter pw = new PrintWriter(System.out)) {
+            try {
+                switch (format) {
+                case "--pretty":
+                    PrettyWriter prettyWriter = new PrettyWriter(pw);
+                    prettyWriter.print(file);
+                    break;
+                case "--xml":
+                    XMLWriter xmlPrinter = new XMLWriter(pw);
+                    xmlPrinter.print(file);
+                    break;
+                case "--json":
+                    JSONWriter jsonWriter = new JSONWriter(pw);
+                    jsonWriter.print(file);
+                    break;
+                default:
+                    userFailed("Unknown option " + format);
+                    break;
+                }
+            } catch (IOException ioe) {
+                userFailed("Could not read recording at " + file.toAbsolutePath() + ". " + ioe.getMessage());
+            }
+        }
+    }
+}