Add FileUtil.java

Kelven Yang · Kelven Yang · commit bd8a1e2c6d63 · 2011-02-17T11:26:34.000-08:00
diff --git a/utils/src/com/cloud/utils/FileUtil.java b/utils/src/com/cloud/utils/FileUtil.java
@@ -0,0 +1,67 @@
+package com.cloud.utils;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class FileUtil {
+	
+    public static String readFileAsString(String filePath) {
+        File file = new File(filePath);
+        if(!file.exists())
+            return null;
+        
+        try {
+            byte[] buffer = new byte[(int)file.length()];
+            BufferedInputStream f = null;
+            try {
+                f = new BufferedInputStream(new FileInputStream(filePath));
+                f.read(buffer);
+            } finally {
+                if (f != null) { 
+                    try { 
+                        f.close(); 
+                    } catch (IOException ignored) {
+                    }
+                }
+            }
+            return new String(buffer);
+        } catch(IOException e) {
+            return null;
+        }
+    }
+    
+    public static void writeToFile(String content, String filePath) throws IOException {
+        BufferedWriter out = null;
+        try {
+            out = new BufferedWriter(new FileWriter(filePath));
+            out.write(content);
+        } finally {
+            if(out != null)
+                out.close();
+        }
+    }
+    
+    public static void copyfile(File f1, File f2) throws IOException {
+        InputStream in = new FileInputStream(f1);
+        OutputStream out = new FileOutputStream(f2);
+
+        try {
+            byte[] buf = new byte[1024];
+            int len;
+            while ((len = in.read(buf)) > 0) {
+                out.write(buf, 0, len);
+            }
+        } finally {
+            in.close();
+            out.close();
+        }
+    }
+}
+
