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從這節(jié)課開始看，

本節(jié)概括了一些框架特性

Spring IOC整合Service

public?class?ResortByDel?{
????private?static?String?BIG_FILE_NAME?=?"D:\\test1.txt";
????private?static?Integer?BATCH_SIZE?=?100;
????private?static?String?LINE_SEPARATOR?=?",";
????private?static?String?SORT_FILE_NAME?=?"D:\\test2.txt";

????private?static?List<String>?separateFile()?{
????????List<String>?fileNameList?=?new?ArrayList<>();
????????try?(BufferedReader?reader?=?new?BufferedReader(new?FileReader(BIG_FILE_NAME)))?{
????????????int?index?=?0;
????????????List<String>?batchLineList?=?new?ArrayList<>(BATCH_SIZE);
????????????String?line;
????????????while?((line?=?reader.readLine())?!=?null?||?batchLineList.size()?>?0)?{
????????????????if?(line?!=?null)?batchLineList.add(line);

????????????????if?(batchLineList.size()?==?BATCH_SIZE?||?(line?==?null?&&?batchLineList.size()?>?0))?{
????????????????????//?內(nèi)容排序
????????????????????batchLineList.sort((a,?b)?->?a.compareTo(b));
????????????????????//?寫小文件
????????????????????String?fileName?=?BIG_FILE_NAME?+?".tmp."?+?index++;
????????????????????try?(FileWriter?tmpWriter?=?new?FileWriter(fileName))?{
????????????????????????for?(String?val?:?batchLineList)?{
????????????????????????????tmpWriter.write(val?+?"\r\n");
????????????????????????}
????????????????????}
????????????????????fileNameList.add(fileName);
????????????????????batchLineList.clear();
????????????????}
????????????}

????????}?catch?(IOException?e)?{
????????????e.printStackTrace();
????????}
????????return?fileNameList;
????}

????private?static?void?mergeFile(List<String>?fileNameList)?{
????????Map<BufferedReader,?String>?map?=?new?HashMap<>();
????????String?preStr?=?null;
????????try?(FileWriter?writer?=?new?FileWriter(SORT_FILE_NAME))?{
????????????for?(String?fileName?:?fileNameList)?{
????????????????BufferedReader?tmpReader?=?new?BufferedReader(new?FileReader(fileName));
????????????????map.put(tmpReader,?tmpReader.readLine());
????????????}
????????????while?(true)?{
????????????????boolean?canRead?=?false;
????????????????Map.Entry<BufferedReader,?String>?minEntry?=?null;
????????????????for?(Map.Entry<BufferedReader,?String>?entry?:?map.entrySet())?{
????????????????????String?value?=?entry.getValue();
????????????????????if?(value?==?null)?{
????????????????????????continue;
????????????????????}
????????????????????//?獲取當(dāng)前?reader?內(nèi)容最小?entry
????????????????????if?((minEntry?==?null)?||?(Integer.valueOf(value)?<?Integer.valueOf(minEntry.getValue())))?{
????????????????????????minEntry?=?entry;
????????????????????}
????????????????????canRead?=?true;
????????????????}
????????????????//?當(dāng)且僅當(dāng)所有?reader?內(nèi)容為空時(shí)，跳出循環(huán)
????????????????if?(!canRead)?{
????????????????????break;
????????????????}
????????????????//去重
????????????????if?(preStr?!=?null?&&?preStr.equals(minEntry.getValue()))?{
????????????????????minEntry.setValue(minEntry.getKey().readLine());
????????????????????continue;
????????????????}
????????????????preStr?=?minEntry.getValue();
????????????????writer.write(minEntry.getValue()?+?"\r\n");
????????????????minEntry.setValue(minEntry.getKey().readLine());
????????????}
????????}?catch?(Exception?e)?{
????????????e.printStackTrace();
????????}?finally?{
????????????//?注意關(guān)閉分片文件輸入流
????????????for?(BufferedReader?reader?:?map.keySet())?{
????????????????try?{
????????????????????reader.close();
????????????????}?catch?(IOException?e)?{
????????????????????e.printStackTrace();
????????????????}
????????????}
????????}
????}

????public?static?void?main(String[]?args)?throws?IOException?{
????????List<String>?separateFiles?=?separateFile();
????????mergeFile(separateFiles);
????}
}

數(shù)據(jù)庫連接池配置

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