当我执行以下代码时:
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Properties;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
public class Transform {
public static Logger logger = Logger.getLogger(Transform.class);
public static void main(String[] args){
//Logger logger = Logger.getLogger(Transform.class);
try
{
PropertyConfigurator.configure("log4j.properties");
Properties prop = new Properties();
String mode = null;
URL url = null;
//String filePath = null;
StringBuilder sb = null;
String csv = null;
String separator = null;
URL sourceCSVURL = null;
URL destinationCSVURL = null;
String sourceCSVFile = null;
String destinationCSVFile = null;
String sourceJson = null;
String destinationJson = null;
int flag = 0;
prop.load(new FileInputStream("jsonGenerator.properties"));
mode = prop.getProperty("mode");
separator = prop.getProperty("separator");
if(!prop.getProperty("sourceCSVURL").trim().equals(""))
{
sourceCSVURL = new URL(prop.getProperty("sourceCSVURL").toString());
}
if(!prop.getProperty("destinationCSVURL").trim().equals(""))
destinationCSVURL = new URL(prop.getProperty("destinationCSVURL").toString());
sourceCSVFile = prop.getProperty("sourceCSVFile");
destinationCSVFile = prop.getProperty("destinationCSVFile");
sourceJson = prop.getProperty("sourceJson");
destinationJson = prop.getProperty("destinationJson");
for(int a=0;a<2;a++)
{
if(mode.trim().toLowerCase().equals("url"))
{
if(flag == 0)
{
csv=IOUtils.toString(sourceCSVURL);
}
else
{
csv=IOUtils.toString(destinationCSVURL);
}
}
else if(mode.trim().toLowerCase().equals("file"))
{
byte[] bytes=null;
if(flag == 0)
{
bytes = org.apache.commons.io.FileUtils.readFileToByteArray(new File(sourceCSVFile));
csv = new String(bytes);
}
else
{
bytes = org.apache.commons.io.FileUtils.readFileToByteArray(new File(destinationCSVFile));
csv = new String(bytes);
}
}
sb = new StringBuilder("{\n\t\"items\": [\n");
csv = csv.replace("\r", "");
String csvValues[] = csv.split("\n");
String header[]=csvValues[0].split(separator);
for(int i=1;i<csvValues.length;i++){
sb.append("\t").append("{").append("\n");
String tmp[]=csvValues[i].split(separator);
for(int j=0;j<tmp.length;j++){
sb.append("\t").append("\t\"").append(header[j]).append("\":\"").append(tmp[j]).append("\"");
if(j<tmp.length-1){
sb.append(",\n");
}else{
sb.append("\n");
}
}
if(i<csvValues.length-1){
sb.append("\t},\n");
}
else{
sb.append("\t}\n");
}
}
File file =null;
sb.append("]\n}");
if(flag==0)
{
file = new File(sourceJson);
}
else
{
file = new File(destinationJson);
}
flag++;
FileUtils.writeStringToFile(file,sb.toString());
}
logger.info("Successfully Executed");
}
catch(MalformedURLException e)
{
logger.error("Error : " + e.getMessage());
e.printStackTrace();
}
catch (Exception e) {
logger.error("Error : " + e.getMessage());
e.printStackTrace();
}
}
}
我得到以下异常:
java.net.UnknownHostException: finance.yahoo.com
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.<init>(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.net.URL.openStream(Unknown Source)
at org.apache.commons.io.IOUtils.toString(IOUtils.java:742)
at org.apache.commons.io.IOUtils.toString(IOUtils.java:727)
at Transform.main(Transform.java:63)
我给出了这些价值观:
sourceCSVURL =http://finance.yahoo.com/d/quotes.csv
destinationCSVURL =http://finance.yahoo.com/d/quotes.csv
答案 0 :(得分:0)
错误消息java.net.UnknownHostException: finance.yahoo.com
表示您的java程序无法解析finance.yahoo.com
的IP地址。
尝试查看是否可以从将运行此程序的实际计算机上下载CSV文件。我的猜测是你的java程序没有互联网连接来解析DNS到finance.yahoo.com