注冊CSDN快六個月了，之前一直是看園子里的文章，或者碰到問題時，進來查點資料，今天終於決定寫一篇自己在園子里的blog。
好吧，鑒於水平太菜，就只記錄過程，其中原理啥的並不是很明晰，所以此blog只在記錄，莫BS哈。
神馬是CSV文件呢，看起來和excel文件很像，具體有神馬不同，見這位圓友的blog哈，http://blog.csdn.net/luweifeng1983/article/details/3582657 。簡單來說，本質是文本文件，但文件分多行，內容以“，”分割，系統默認是excel打開的一種文件。
好吧，我們以下面這個通訊錄CSV文件為例。
| name | company | mobile-phone | address | relationship |
| Lisa | hp | 18702341678 | Wuhan | classmates |
| Tony | ibm | 15809323145 | Wuhan | friends |
下面開始轉換過程的講解嘍。
1. 讀取csv文件
1）Java操作csv文件有專門的的API叫javacsv.jar
下載地址如下：
http://sourceforge.net/project/showfiles.php?group_id=33066
2）自己項目中使用的工具是dataimport_3.3.0-rc1.jar
下載地址如下：
http://grepcode.com/snapshot/repo1.maven.org/maven2/net.sf.squirrel-sql.plugins/dataimport/3.3.0-rc1
讀取示例代碼：
//read csv file
CsvReader cr = new CsvReader(new InputStreamReader(new FileInputStream(new File(filename)),
"UTF-8"));
//read csv file headers
cr.readHeaders();
//read csvv file records
cr.readRecord();
2.將讀取到的csv文件轉換成xml格式
1)先確定自己要求替換完的xml數據的格式，假如如下圖定義，可設置為資源文件，命名為addresslist.xml.
<?xml version="1.0" encoding="UTF-8"?>
<AddressList>
<Person>
<Name>@name@</Name>
<Company>@company@</Company>
<MobilePhone>@mobilephone@</MobilePhone>
<Address>@address@</Address>
<Relationship>@relationship@</Relationship>
</Person>
</AddressList>
2)讀取資源文件addresslist.xml。
String mapping = "addresslist.xml";
URL url = ConfigurationUtils.locate(mapping);
SAXReader reader = new SAXReader();
Document doc = reader.read(url);
3)完成替換（此步驟是將CSV文件中的數據記錄按行替換資源文件中的占位符，生成xml消息）
//find Node "Name" in addresslist.xml
Element name = (Element) doc.selectSingleNode("/AddressList/Person/Name");
//read "name" from csv file and set value for Node "Name"
name.setText(cr.get("name"));
//find Node "Company" in addresslist.xml
Element company = (Element) doc.selectSingleNode("/AddressList/Person/Company");
//read "company" from csv file and set value for Node "Company"
company.setText(cr.get("company");
//find Node "MobilePhone" in addresslist.xml
Element mobilephone = (Element) doc.selectSingleNode("/AddressList/Person/MobilePhone");
//read "mobile-phone" from csv file and set value for Node "MobilePhone"
mobilephone.setText(cr.get("mobile-phone"));
//find Node "Address" in addresslist.xml
Element address = (Element) doc.selectSingleNode("/AddressList/Person/Address");
//read "address" from csv file and set value for Node "Address"
mobilephone.setText(cr.get("address"));
//find Node "RelationShip" in addresslist.xml
Element relationship = (Element) doc.selectSingleNode("/AddressList/Person/RelationShip");
//read "relationship" from csv file and set value for Node "RelationShip"
relationship.setText(cr.get("relationship"));
4)將xml消息轉換成文本輸出
String record= doc.asXML()；
可配合while，循環轉換csv文件中的三條記錄。
完整的java code來了呢
1 package demo.csv; 2 3 import java.io.File; 4 import java.io.FileInputStream; 5 import java.io.FileNotFoundException; 6 import java.io.IOException; 7 import java.io.InputStreamReader; 8 import java.io.UnsupportedEncodingException; 9 import java.net.URL; 10 import java.util.ArrayList; 11 import java.util.Iterator; 12 import java.util.List; 13 14 import org.apache.commons.configuration.ConfigurationUtils; 15 import org.dom4j.Document; 16 import org.dom4j.Element; 17 import org.dom4j.io.SAXReader; 18 19 import com.csvreader.CsvReader; 20 21 public class CsvDemo { 22 23 private static List<String> transformCsv2Xml(String filename) { 24 25 String mapping = "src/demo/csv/address.xml"; 26 27 List<String> messages = new ArrayList<String>(); 28 29 try { 30 URL url = ConfigurationUtils.locate(mapping); 31 SAXReader reader = new SAXReader(); 32 Document doc = reader.read(url); 33 34 //read csv file 35 CsvReader cr = new CsvReader(new InputStreamReader(new FileInputStream(new File(filename)), 36 "UTF-8")); 37 //read csv file headers 38 cr.readHeaders(); 39 40 //read csv file records 41 //cr.readRecord(); 42 while (cr.readRecord()) { 43 //find Node "Name" in addresslist.xml 44 Element name = (Element) doc.selectSingleNode("/AddressList/Person/Name"); 45 //read "name" from csv file and set value for Node "Name" 46 name.setText(cr.get("name").trim()); 47 //find Node "Company" in addresslist.xml 48 Element company = (Element) doc.selectSingleNode("/AddressList/Person/Company"); 49 //read "company" from csv file and set value for Node "Company" 50 company.setText(cr.get("company").trim()); 51 //find Node "MobilePhone" in addresslist.xml 52 Element mobilephone = (Element) doc.selectSingleNode("/AddressList/Person/MobilePhone"); 53 //read "mobile-phone" from csv file and set value for Node "MobilePhone" 54 mobilephone.setText(cr.get("mobile-phone").trim()); 55 //find Node "Address" in addresslist.xml 56 Element address = (Element) doc.selectSingleNode("/AddressList/Person/Address"); 57 //read "address" from csv file and set value for Node "Address" 58 address.setText(cr.get("address").trim()); 59 //find Node "RelationShip" in addresslist.xml 60 Element relationship = (Element) doc.selectSingleNode("/AddressList/Person/Relationship"); 61 //read "relationship" from csv file and set value for Node "RelationShip" 62 relationship.setText(cr.get("relationship").trim()); 63 // break; 64 messages.add(doc.asXML()); 65 } 66 67 } catch (UnsupportedEncodingException e) { 68 69 } catch (FileNotFoundException e) { 70 71 } catch (IOException e) { 72 73 } catch (Exception ex) { 74 75 } 76 return messages; 77 } 78 79 80 public static void main(String[] args) { 81 82 List<String> addresslist = transformCsv2Xml("src/demo/csv/data.csv"); 83 Iterator<String> it = addresslist.iterator(); 84 while(it.hasNext()){ 85 System.out.println(it.next()); 86 } 87 88 } 89 90 }
介紹完畢，，，雖然內容很少，但完整記錄下來好費時間，可能是太菜，思路也不太清楚的原因吧，好吧，還是累屎姐了，不知道下一次下決心寫會是神馬時候。
2013-05-14