文件差異和補全功能使用diff_match_patch

   主要用於增量更新的場景，減少網絡之間傳輸大小，提高速度

1. 文件對比找出對應的差異，比如文件a和文件b對比，找出對應的差異diff_c

例子：

String a = "1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n";
String b = "abcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghijk\n";
LinkedList<Diff> diffFile = dmp.diff_main(a, b, true);
assertEquals("diff_main: Simple line-mode.", dmp.diff_main(a, b, true),
dmp.diff_main(a, b, false));
System.out.println(diffFile);  // 輸出差異內容

2. 根據差異文件diff_c和文件a獲得對應的文件b

例子：

LinkedList<Patch> patchs = dmp.patch_make(a, diffFile);
System.out.println(patchs);
// System.out.println(dmp.patch_toText(patchs));

System.out.println(dmp.patch_apply(patchs, a)[0]);
String result = dmp.patch_apply(patchs, a)[0].toString(); // 恢復文件
assertEquals(result, b);

庫文件鏈接地址：

http://download.csdn.net/download/lwjaiyjk3/10160010

詳細查看：

 http://blog.csdn.net/liu__520/article/details/71908149