汉得第二次考核答案整理（通信，IO，文件等）

1， (8 分 ) 使用程序从网上下载 pdf, 网址为
http://files.saas.hand-china.com/java/target.pdf,保存在本地,
编程时使用带缓冲的读写,将需要保证保存后的 pdf 文件能正常
打开.

解析：只能用字节流来读写，用字符流写入pdf后 文件打不开，程序还与待优化

 package com.fansi.com;

 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLConnection;

 public class Url_File {

     public static void main(String[] args) {

         try {

             URL url = new URL("http://files.saas.hand-china.com/java/target.pdf");
             URLConnection conn =  url.openConnection();
             InputStream is = conn.getInputStream();
             BufferedInputStream bis = new BufferedInputStream(is);

             File file = new File("target.pdf");
             FileOutputStream fos = new FileOutputStream(file);
             BufferedOutputStream bos = new BufferedOutputStream(fos);

             ];
             ){
                 bos.write(b);
             }

             bos.close();
             fos.close();
             bis.close();
             is.close();

         } catch (MalformedURLException e) {

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

     }

 }

2， (8 分)实现一个 Socket 服务器端和一个 Socket 客户端,先启动服
务器端,当客户端连接上来后,将第一题中得到的 target.pdf 通过
Stream 发送给客户端,客户端接收并保存为 pdf 文件,并保证 pdf
文件能被正常打开.

服务器端代码，Server.java (字节流)

 package com.fansi;

 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.net.ServerSocket;
 import java.net.Socket;

 public class Server {

     public static void main(String[] args) {
         try {
             ServerSocket serversocket = );
             while(true){
                 Socket socket = serversocket.accept();
                 System.out.println("有客户端连上了");

                 File file = new File("down.pdf");
                 FileInputStream fis = new FileInputStream(file);
                 BufferedInputStream bis = new BufferedInputStream(fis);

                 BufferedOutputStream bos = new BufferedOutputStream(socket.getOutputStream());

                 ];
                 ){
                     bos.write(b);

                 }
                 bos.close();
                 bis.close();
                 fis.close();
             }

         } catch (IOException e) {

             e.printStackTrace();
         }
     }
 }

客户端代码，Client.java(字节流)

 package com.fansi;

 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.net.Socket;
 import java.net.UnknownHostException;

 public class Client {

     public static void main(String[] args) {
         try {

             Socket socket = );
             BufferedInputStream bis =new BufferedInputStream(socket.getInputStream());

             File file = new File("new.pdf");
             FileOutputStream fos = new FileOutputStream(file);
             BufferedOutputStream bos = new BufferedOutputStream(fos);

             ];
             ){
                 bos.write(b);
             }
             bos.flush();
             bos.close();
             fos.close();
             bis.close();

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

     }
 }

3， (8 分)
Sina 股票数据接口,以大秦铁路（股票代码：601006）为
例，如果要获取它的最新行情，只需访问新浪的股票数据
接口：http://hq.sinajs.cn/list=sh601006 这个 url 会返回
一串文本，例如：
var hq_str_sh601006="大秦铁路, 27.55, 27.25, 26.91,
27.55, 26.20, 26.91, 26.92,
22114263, 589824680, 4695, 26.91, 57590, 26.90, 14700,
26.89, 14300,
26.88, 15100, 26.87, 3100, 26.92, 8900, 26.93, 14230,
26.94, 25150, 26.95, 15220, 26.96, 2008-01-11, 15:05:32";
这个字符串由许多数据拼接在一起，不同含义的数据用逗
号隔开了，顺序号从 0 开始。
0：”大秦铁路”，股票名字；name
1：”27.55″，今日开盘价；open
2
2：”27.25″，昨日收盘价；close
3：”26.91″，当前价格；current
4：”27.55″，今日最高价；high
5：”26.20″，今日最低价；low
编程访问 http://hq.sinajs.cn/list=sz300170 ,解释所得到的数
据,并将生成 XML 数据文件和 JSON 文件,并保存到本地,如:
xml 数据:

xxxxx
< open >xxxxx
……

json 数据:
{name:”xxx”,open:xxxx……}

Json_Xml.java (字符流)

 package com.fansi;

 import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.OutputStreamWriter;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLConnection;

 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.parsers.ParserConfigurationException;
 import javax.xml.transform.Result;
 import javax.xml.transform.Source;
 import javax.xml.transform.Transformer;
 import javax.xml.transform.TransformerConfigurationException;
 import javax.xml.transform.TransformerException;
 import javax.xml.transform.TransformerFactory;
 import javax.xml.transform.dom.DOMSource;
 import javax.xml.transform.stream.StreamResult;

 import org.w3c.dom.Document;
 import org.w3c.dom.Element;

 import com.google.gson.JsonObject;

 public class Json_Xml {

     public static void main(String[] args) {

         try {

             URL url = new URL("http://hq.sinajs.cn/list=sz300170");
             URLConnection conn = url.openConnection();
             InputStreamReader bis = new InputStreamReader(conn.getInputStream());
             BufferedReader br = new BufferedReader(bis);

             String line;
             String[] res = ];
             while((line=br.readLine())!=null){
                System.out.println(line);
                res = line.split(",");
             }
 //            for(int i=0;i<res.length;i++){
 //                System.out.println(res[i]);
 //            }
             res[]=res[].substring();
             //System.out.println(res[0]);

             br.close();
             bis.close();

             //-----------------json创建
             JsonObject object = new JsonObject();

             ]);
             ]);
             ]);
             ]);
             ]);
             ]);

             //System.out.println(object.toString());
             File f1 = new File("json.txt");
             FileOutputStream fis1 = new FileOutputStream(f1);
             OutputStreamWriter osw1 = new OutputStreamWriter(fis1, "utf-8");
             BufferedWriter bw1 = new BufferedWriter(osw1);

             bw1.write(object.toString());

             bw1.close();
             osw1.close();
             fis1.close();

             //---------------------------xml的写

             try {

                 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
                 DocumentBuilder builder = factory.newDocumentBuilder();
                 Document document = builder.newDocument();
                 Element root = document.createElement("hand");

                 Element r1 = document.createElement("name");
                 r1.setTextContent(res[]);
                 root.appendChild(r1);

                 Element r2 = document.createElement("open");
                 r2.setTextContent(res[]);
                 root.appendChild(r2);

                 Element r3 = document.createElement("current");
                 r3.setTextContent(res[]);
                 root.appendChild(r3);

                 Element r4 = document.createElement("high");
                 r4.setTextContent(res[]);
                 root.appendChild(r4);

                 Element r5 = document.createElement("low");
                 r5.setTextContent(res[]);
                 root.appendChild(r5);

                 document.appendChild(root);

                 TransformerFactory transformerFactory = TransformerFactory.newInstance();
                 Transformer transformer = transformerFactory.newTransformer();

                 transformer.transform(new DOMSource(document), new StreamResult(new File("xml.txt") ));

             } catch (ParserConfigurationException e) {

                 e.printStackTrace();
             } catch (TransformerConfigurationException e) {
                 e.printStackTrace();
             } catch (TransformerException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }

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

     }

 }