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();
}
}
}