考试题1

• 针对pdf打不开的问题进行改正：

  public class App
  {
  public static void main( String[] args )
  {
      try {
          // 实际不确定文件类型的时候，需要用字节流进行传递，之后会原样输出，否则会有错误
          URL url = new URL("http://192.168.11.205:18080/trainning/SampleChapter1.pdf");
          URLConnection connection = url.openConnection();
  
          InputStream is = connection.getInputStream();
  
          byte [] getData = readInputStream(is);
  
          File f1 = new File("Exam1/tmp");
          if(!f1.exists()) {
              f1.mkdir();
          }
  
          File file = new File("Exam1/tmp/SampleChapter1.pdf");
  
          FileOutputStream fos = new FileOutputStream(file);
          fos.write(getData);
          if (fos!=null){
              fos.close();
          }
          if (is != null){
              is.close();
          }
  
  
      } catch (MalformedURLException e) {
          e.printStackTrace();
      } catch (IOException e) {
          e.printStackTrace();
      }
  
  }
  
  public static byte[] readInputStream(InputStream inputStream) throws IOException {
      byte [] buffer = new byte[1024];
      int len = 0;
      ByteArrayOutputStream bos = new ByteArrayOutputStream();
      while((len = inputStream.read(buffer))!=-1){
          bos.write(buffer,0,len);
      }
      bos.close();
      return bos.toByteArray();
  
  }
  }
  

考试题2

• 针对pdf打不开的问题进行改正

• Server端

  public class Server {
  public static void main(String [] arga){
  
  
      try{
          ServerSocket ss = new ServerSocket(12345);
          Socket s = ss.accept();
          System.out.println("connect!");
  
          File file = new File("Exam1/tmp/SampleChapter1.pdf");
  
          FileInputStream fis = new FileInputStream(file);
  
          byte b [] = new byte[1024];
  
          ByteArrayOutputStream baos = new ByteArrayOutputStream();
          BufferedOutputStream bos = new BufferedOutputStream(s.getOutputStream());
  
          int len;
          while ((len = fis.read(b))!= -1){
              baos.write(b, 0 ,len);
  
          }
          bos.write(baos.toByteArray());
  
          bos.close();
          baos.close();
          fis.close();
  
      }catch(IOException e){
          e.printStackTrace();
          System.out.println("程序运行错误："+e);
      }
  }
  }
  

• Client端

  public class Client {
  public static void main(String [] arga){
      try {
          Socket s = new Socket("127.0.0.1",12345);
  
          InputStream is = s.getInputStream();
  
          File f1 = new File("Exam2/tmp");
          if (!f1.exists()){
              f1.mkdir();
          }
          File file = new File("Exam2/tmp/SampleChapter1.pdf");
  
          ByteArrayOutputStream baos = new ByteArrayOutputStream();
          BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));
  
          byte b [] = new byte[1024];
          int len = 0;
          while ((len = is.read(b))!= -1){
              baos.write(b, 0 ,len);
          }
          bos.write(baos.toByteArray());
  
          bos.close();
          baos.close();
          is.close();
  
  
      }catch(ConnectException connExc){
          System.out.println("连接失败！");
      } catch (UnknownHostException e) {
          e.printStackTrace();
      } catch(IOException e){
          e.printStackTrace();
      }
  }
  }