更改分割數

Question

今天，我的代碼可以工作，但它將2行分成2行，但這不是目標。 我想改變分割，我要劃分50線50線，而不是由2 2 如果我離開這樣的，我有2行 三個文件，如果我有135行，我想：

• 拳文件：50線（我的文件的行1-50）和文件名是801
• 第二個文件：50線（我的文件的行51-100）和文件名是802
• 第三個文件：35行（我的文件的101-135行）和文件名是803.

在這裏，這是我的代碼：

private void MyCode(ProducerTemplate producerTemplate, InputStream content, String endpoint, String fileName, HashMap<String, Object> headers){ 
    ArrayList<String> list = new ArrayList<String>(); 
    String line; 
    long numSplits = 50; //Number of lines per split    
    int sourcesize=0; //Number of lines 
    int number = 800; //my filename 
    BufferedReader br = new BufferedReader(new InputStreamReader(content)); 

    try{ 

     while((line = br.readLine()) != null){ 
      sourcesize++; 
      list.add(line); //add the lines in the arraylist 
     } 

     System.out.println("Lines in the file: " + sourcesize); 

     for(int i = 0 ; i <= list.size() ; i+=numSplits) { 
      String Filename = ""+ number; 
      System.out.println(Filename); 
      StringBuilder builder = new StringBuilder(); 
      builder.append(list.get(i)).append(System.lineSeparator()).append(list.get(i+1)); 
      producerTemplate.sendBodyAndHeader(endpoint, builder.toString(), "CamelFileName",Filename); //Used to forward lines and the file name 
     } 

    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
} 

我想：

for (int k=0;k<numSplits;k++) { 
     builder.append(list.get(i)); 
     builder.append(System.lineSeparator()); 
} 

如何改變分割？ 如何削減我的arraylist全部50個事件？

Answer 1

private void MyCode(ProducerTemplate producerTemplate, InputStream content, String endpoint, String fileName, HashMap<String, Object> headers){ 
    BufferedReader br = new BufferedReader(new InputStreamReader(content)); 

    ArrayList<String> list = new ArrayList<String>(); 
    String line; 
    int numSplits = 50; 
    int number = 800;   
    int sourcesize=0; 
    try{ 
     while((line = br.readLine()) != null){ 
      sourcesize++; 
      list.add(line); 
     } 
    } 
    catch (IOException e){ 
     e.printStackTrace(); 
    } 
    System.out.println("Lines in the file: " + sourcesize); 
    ArrayList<ArrayList<String>> parts = cutListInChunksOfSameSize(list, numSplits); 

    for (ArrayList<String> part : parts){ 
     String Filename = ""+ (number++); 
     System.out.println(Filename); 
     StringBuilder builder = new StringBuilder(); 

     for(int i = 0 ; i <part.size() ;i++){ 
      builder.append(part.get(i)).append(System.lineSeparator());     
     } 
     producerTemplate.sendBodyAndHeader(endpoint, builder.toString(), "CamelFileName",Filename); 
    } 
} 

public <T> ArrayList<ArrayList<T>> cutListInChunksOfSameSize(ArrayList<T> list, final int L) { 
    ArrayList<ArrayList<T>> parts = new ArrayList<ArrayList<T>>(); 
    final int N = list.size(); 
    for (int i = 0; i < N; i += L) { 
     parts.add(new ArrayList<T>(list.subList(i, Math.min(N, i + L)))); 
    } 
    return parts; 
}