数据格式如下:第一个字段代表用户,现想根据用户进行分组(一个用户的数据生成一个文件),新手,跪求Java代码样例!!!学习中......
13658439b06f2ac6,20180225171934,26427,188129793,120.74188,30.67139
13658439b06f2ac6,20180225172216,26427,191383809,120.72743,30.64796
13658439b06f2ac6,20180225172218,26427,16992,120.70445,30.63925
13658439b06f2ac6,20180225172218,26427,10255,120.67361,30.62691
13658439b06f2ac6,20180225172741,26427,195084290,120.67361,30.62691
13658439b06f2ac6,20180225172754,26427,195084291,120.67361,30.62691
13658439b06f2ac6,20180225172756,26427,30563,120.66801,30.61831
13658439b06f2ac6,20180225173117,26427,191368451,120.66801,30.61831
13658439b06f2ac6,20180225173201,26427,157639298,120.657473,30.613528
13658439b06f2ac6,20180225173202,26427,20281,120.65462,30.61538
13658439b06f2ac6,20180225173338,26427,191368451,120.66801,30.61831
20872b3227e4fbcf,20180225213237,26676,191260930,120.31461,30.39352
20872b3227e4fbcf,20180225213421,26676,191267587,120.34469,30.40762
20872b3227e4fbcf,20180225213503,22589,83449987,120.359783,30.416872
20872b3227e4fbcf,20180225213506,26676,191305476,120.350931,30.410281
20872b3227e4fbcf,20180225213522,22589,83449987,120.359783,30.416872
20872b3227e4fbcf,20180225213722,22589,195099138,120.381901,30.432121
20872b3227e4fbcf,20180225213903,22589,157724034,120.400631,30.448457
20872b3227e4fbcf,20180225213938,22589,195099651,120.408821,30.456641
20872b3227e4fbcf,20180225214038,22589,195099905,120.417281,30.465461
20872b3227e4fbcf,20180225214137,22589,191288072,120.4334,30.47696
20872b3227e4fbcf,20180225214407,22589,191273473,120.46262,30.48792
2329452424d0c723,20180225151131,22579,195087619,120.921562,30.781574
2329452424d0c723,20180225151149,22579,191183364,120.91475,30.77855
2329452424d0c723,20180225151206,22579,195087619,120.921562,30.781574
2329452424d0c723,20180225151236,22579,195087618,120.921562,30.781574
2329452424d0c723,20180225151255,22579,195088130,120.925901,30.78723
2329452424d0c723,20180225151336,22579,106000129,120.93905,30.79096
2329452424d0c723,20180225151436,22579,195220995,120.946207,30.795335
2329452424d0c723,20180225151519,22579,106009090,120.94625,30.80181
2329452424d0c723,20180225151802,22576,105997572,120.949821,30.801927
2329452424d0c723,20180225152136,22579,106009089,120.94625,30.80181
2329452424d0c723,20180225152206,22579,195088387,120.95743,30.81409
2329452424d0c723,20180225152327,22579,191178755,120.96937,30.82035