Stream streams Bulk Read and merge files

ImportJava.io.BufferedReader;ImportJava.io.File;ImportJava.io.FileOutputStream;ImportJava.io.FileReader;ImportJava.io.FileWriter;Importjava.io.IOException;ImportJava.io.StringWriter;ImportJava.nio.channels.FileChannel;ImportJava.util.Iterator;Importjava.util.List;ImportJava.util.Map;Importorg.apache.commons.io.FileUtils;Importorg.apache.commons.lang.StringUtils;ImportCom.ist.common.properties.SysConfig;/*** File Merge * * **/ Public classServertemplateextendsTemplate {/**cross-platform line break*/     Public Static FinalString line_separator = System.getproperty ("Line.separator"); /*** Merge Documents * @Method Mergefiles * @Author lbh * @Date 2014-12-11 pm 02:59:54 * @paramoutFile path + output file name *@paramfiles input File list*/     Public BooleanMergefiles (String outFile, list<string>files) {         BooleanMergeresult =true; FileChannel Fileoutchannel=NULL;//declaring channelsFileReader FileReader =NULL; BufferedReader BufferedReader=NULL ; Try{            if(Files = =NULL|| Files.size () < 1) {Logger.info ("Make sure there has outnumber 2 files"); //System.out.println ("Make sure there has outnumber 2 files");Mergeresult =false; }            Else if(files.size () = = 1) {//only one file, so just rename itFile File =NewFile (Files.get (0). toString ()); File.renameto (NewFile (outFile)); }            Else{Fileoutchannel=NewFileOutputStream (OutFile). Getchannel ();//instantiate the output channel, at which point theCreate a file. //Loop All Files                /*Iterator it = Filemap.keyset (). Iterator (); int i = 0; Count while (It.hasnext ()) {*/                 for(inti=0; I<files.size (); i++){                    //System.out.println (Files.get (i));File File =NewFile (Files.get (i). toString ()); if(!file.exists ()) {//Fault tolerance CheckLogger.info ("Make sure every file is existed"); //System.out.println ("file:" + files.get (i) + "is not existed");} filereader=Newfilereader (file); if(!filereader.ready ()) {//Fault tolerance CheckLogger.info ("Make sure every file is existed"); //System.out.println ("file" + files.get (i) + " is not already toRead");} BufferedReader=NewBufferedReader (FileReader); /*InputStreamReader inputstreamreader = new InputStreamReader (new FileInputStream (Files[i]), "UTF-8");//                    This reads the file for stream mode, makes the backup. BufferedReader BufferedReader = new BufferedReader (inputstreamreader);*/                                         //Start processing Files                    if(BufferedReader! =NULL){                        if(i = = 0) {//if it is the first file, then the first two lines are removed before the last row is writtenMergeresult = Handlefile ("fist", BufferedReader, outFile); }                        Else if(i = = Files.size ()-1) {//If this is the last file, then remove the first two lines, keep the last line Mergeresult= Handlefile ("Last", BufferedReader, outFile); }                        Else{//Others remove the first two lines and the last line at the same timeMergeresult = Handlefile ("normal", BufferedReader, outFile); }                        //System.out.println ("file:" + files.get (i) + "merge sate is--"+mergeresult);//logger.info ("File:" +files.get (i) + "merge sate is--"+mergeresult);                    }                                         //Delete the fileFile.delete (); }            }            } Catch(IOException e) {e.printstacktrace (); returnMergeresult; }                         //Close                         if(Fileoutchannel! =NULL){                Try{Bufferedreader.close ();}Catch(IOException Ignore) {returnMergeresult;} }            if(FileReader! =NULL){                Try{Filereader.close ();}Catch(IOException Ignore) {returnMergeresult;} }            if(BufferedReader! =NULL){                Try{Bufferedreader.close ();}Catch(IOException Ignore) {returnMergeresult;} }                 returnMergeresult; }         /*** Process Single file, write immediately after reading, type:fist--first file, last--last file, and other file * @Method handlefile * @Author LBH * @Date 2014-12-11 a.m. 09:49:19*/     Public Static Booleanhandlefile (String type, BufferedReader BufferedReader, String outFile) {BooleanHandleresult =false;//is successfulFileWriter FileWriter =NULL; String readString= "";//storing variables for reading dataString stra,strb,strc;//Temp Variable        Try{FileWriter=NewFileWriter (OutFile,true); if("Fist". Equals (Type)) {//processing of the first fileStra = ""; StrB= ""; STRC= ""; intFisti = 0;//Count                 while((STRC = Bufferedreader.readline ())! =NULL){//start looping from the first lineStra =StrB; StrB=strc; ReadString= Stra + line_separator;//the last line of STRB is discarded//Output                    if(Fisti > 0) {//avoid the first line of blank linesFilewriter.write (readString); } Fisti++; } Handleresult=true; }            if("Last". Equals (Type)) {//processing of end filesStra = "";                Bufferedreader.readline (); Bufferedreader.readline (); //executed two times, the first two rows have been read and discarded.                  while((Stra = Bufferedreader.readline ())! =NULL){//Start Cycle ReadreadString = Stra +Line_separator; //OutputFilewriter.write (readString); } Handleresult=true; }            Else{//processing of other filesStra = ""; StrB= ""; STRC= "";                Bufferedreader.readline (); Bufferedreader.readline (); //executed two times, the first two rows have been read and discarded.                 Longi = 0;  while((STRC = Bufferedreader.readline ())! =NULL){//Start Cycle ReadStra =StrB; StrB=strc; ReadString= Stra + line_separator;//the last line of STRB is discarded//Output                    if(i > 0) {//avoid the first line of blank linesFilewriter.write (readString); } I++; } Handleresult=true; }        }        Catch(IOException e) {e.printstacktrace (); returnHandleresult; }        finally{            Try{bufferedreader.close ();                Filewriter.close (); }            Catch(IOException Ignore) {returnHandleresult;} }                 returnHandleresult; }          Public Static voidMain (string[] args)throwsexception{/*System.out.println ("Start");        list<string> ssss = new arraylist<string> ();        Ssss.add ("E:\\111\\xmltest\\a.xml");        Ssss.add ("E:\\111\\xmltest\\b.xml");        Ssss.add ("E:\\111\\xmltest\\c.xml");        Servertemplate st = new Servertemplate ();        St.mergefiles ("E:\\111\\xmltest\\stream2.xml", ssss); System.out.println ("End");*/    }     }

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Stream streams Bulk Read and merge files