文件差异和补全功能使用diff_match_patch

   主要用于增量更新的场景，减少网络之间传输大小，提高速度

1. 文件对比找出对应的差异，比如文件a和文件b对比，找出对应的差异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);  // 输出差异内容

2. 根据差异文件diff_c和文件a获得对应的文件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(); // 恢复文件

assertEquals(result, b);

库文件链接地址：
http://download.csdn.net/download/lwjaiyjk3/10160010
详细查看：

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