如何將BufferedReader的內容放入String？

Question

有沒有辦法將BufferedReader一次性放入String中，而不是逐行放置？ 這是我到目前為止：

            BufferedReader reader = null;
            try 
            {
                reader = read(filepath);
            } 
            catch (Exception e) 
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
                String line = null;
                String feed = null; 
                try 
                {
                    line = reader.readLine();
                } 
                catch (IOException e) 
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }


                while (line != null) 
                {
                    //System.out.println(line);
                    try 
                    {
                        line = reader.readLine();
                        feed += line; 
                    } 
                    catch (IOException e) 
                    {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } 
                }
        System.out.println(feed); 

Answer 1

您可以使用Apache FileUtils庫。

Answer 2

使用StringBuilder和read(char[], int, int)方法看起來像這樣，並且可能是在Java中執行它的最佳方式：

final MAX_BUFFER_SIZE = 256; //Maximal size of the buffer

//StringBuilder is much better in performance when building Strings than using a simple String concatination
StringBuilder result = new StringBuilder(); 
//A new char buffer to store partial data
char[] buffer = new char[MAX_BUFFER_SIZE];
//Variable holding number of characters that were read in one iteration
int readChars;
//Read maximal amount of characters avialable in the stream to our buffer, and if bytes read were >0 - append the result to StringBuilder.
while ((readChars = stream.read(buffer, 0, MAX_BUFFER_SIZE)) > 0) {
    result.append(buffer, 0, readChars);
}
//Convert StringBuilder to String
return result.toString();

Answer 3

如果您知道輸入的長度（或它的上限），您可以使用read(char[],int,int)將整個事物讀取到字符數組，然后使用它來構建String。 如果您的第三個參數（ len ）大於該大小，則該方法將返回讀取的字符數。

Answer 4

使用Guava ， CharStreams.toString(reader)可以勝任。