Java 文本輸入主要包含兩種方法：FileRead -- 按字符讀入，InputSreamReader -- 按行輸入。

java 文本輸出也包含兩種方法：FileWriter 和 OuputStreamWriter，這兩種都是按字符輸出。

應用代碼如下：

1 package stream.inout; 2 3 import java.io.*; 4 5 public class FileStream { 6 7 public static void main(String a[]){ 8 String inputfilepath = "E:/in.txt"; 9 /* 10 in.txt data : 11 12345 12 in2.txt data : 13 11 14 22 15 33 16 44 17 55 18 output1.txt data : 19 tttttrrrrreeeeewwwwwqqqqq 20 output2.txt data : 21 tttrrreeewwwqqq 22 */ 23 24 //method no.1 ======================================= 25 try{ 26 int []input1 = new int[5]; 27 File inputfile = new File(inputfilepath); 28 if(inputfile.isFile() && inputfile.exists()){ 29 //這里的讀入是按字符讀入 30 FileReader fileread = new FileReader(inputfile); 31 int tmp = 0; 32 int i = 0; 33 while((tmp = fileread.read()) != -1){ 34 input1[i++] = tmp - '0'; 35 } 36 fileread.close(); 37 for(i = 0; i < 5; i ++) 38 System.out.println("input1[ " + i +" ]= " + input1[i]); 39 }else{ 40 System.out.println("file is not exist"); 41 } 42 }catch (Exception e){ 43 System.err.println("error happened"); 44 e.printStackTrace(); 45 } 46 47 48 //method no.2 ======================================= 49 try{ 50 String []input2 = new String[5]; 51 String input2filepath = "E:/in2.txt"; 52 File inputfile = new File(input2filepath); 53 if(inputfile.isFile() && inputfile.exists()){ 54 //這里的讀入是按行讀入 55 InputStreamReader isr = new InputStreamReader(new FileInputStream(inputfile)); 56 BufferedReader br = new BufferedReader(isr); 57 int i = 0; 58 String line = null; 59 //需注意的是每執行一次br.readLine()，就跳入下一行，故引入一個變量來記錄 60 while((line = br.readLine()) != null){ 61 input2[i++] = line; 62 } 63 br.close(); 64 isr.close(); 65 for(i = 0; i < 5; i ++) 66 System.out.println("input2[ " + i +" ]= " + input2[i]); 67 68 }else{ 69 System.out.println("file is not exist"); 70 } 71 }catch (Exception e){ 72 System.err.println("error happened"); 73 e.printStackTrace(); 74 } 75 76 //output method no.1 ============================ 77 String outputfile1 = "E:/output1.txt"; 78 String outputfile2 = "E:/output2.txt"; 79 try{ 80 String []output = {"ttttt", "rrrrr", "eeeee", "wwwww", "qqqqq"}; 81 FileWriter filewriter = new FileWriter(outputfile1, false); 82 for(int i = 0; i < 5; i ++){ 83 filewriter.write(output[i]); 84 } 85 filewriter.close(); 86 87 }catch (Exception e){ 88 System.err.println("error happened"); 89 e.printStackTrace(); 90 } 91 //output method no.2 ============================ 92 try { 93 String []output1 = {"ttt", "rrr", "eee", "www", "qqq"}; 94 OutputStreamWriter outsw = new OutputStreamWriter(new FileOutputStream(outputfile2)); 95 BufferedWriter bw = new BufferedWriter(outsw); 96 97 for(int i = 0; i < 5; i ++){ 98 bw.write(output1[i]); 99 } 100 bw.flush(); 101 bw.close(); 102 outsw.close(); 103 } catch (Exception e) { 104 // TODO: handle exception 105 System.err.println("error happened"); 106 e.printStackTrace(); 107 } 108 } 109 110 }

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轉載于:https://www.cnblogs.com/z1987/p/4886289.html

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