????java.io?????

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?????9?

• ????
• ????java.io?????

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Goal?Objective

• Goal??????????????????????????
  ????????????????java.io??????????????????
  ?????????????????
• Objective??????????????????????????java.io????
  ????????java.io?????????????????????

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????????

• ??????(CUI?) ??????????????

???????1.????? 2.??????? 3.????? 4.???????
5.??????? 6.?????????? 3 ????500? cola120?? sod
a120? ??????0????? ?????????0???????? ?????????
??????? cola cola??????? ????380??????
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?????????????

• ??????????????? ????????????????????

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????????????
????????(???????????)??????????????????????????
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????????

• ????????

?????????????????RDB
??????????
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lt??gt???????????????

• ??

BufferedReader br new BufferedReader(new
FileReader(???1.log)) ??? br.readLine()
br.close()

• ??

PrintWriter pwnew PrintWriter(newFileWriter(???1
.log)) fw.write(???) fw.close()
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lt??gt?????????????
//DB?URL?????? String url
"jdbcinterbase//etude.crew.sfc.keio.ac.jp//home
/bam/jihanki.gdb" //DB???????????????
????? java.sql.Connection conn
java.sql.DriverManager.getConnection( url ,
"sysdba" , "masterkey" )
//SQL??????????????????(resultSet)?????
String sqlString "select from user_info"
java.sql.Statement statement
conn.createStatement() java.sql.ResultSet
rs statement.executeQuery( sqlString )
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????????
?????????????????????? ?????????????
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??????????lt??gt

• ??

ObjectOutputStream ??
new ObjectOutputStream(new FileOutputStream(????.
log)) ??.writeObject(????)
??.close()
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??????????lt??gt

• ??

ObjectInputStream ?? new
ObjectInputStream(new FileInputStream(????.log)
) ????(?????)??.readObject() ??.close()
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java.io.Serializable????????
public class ????? implements Serializable

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????

• BufferedReader
• FileReader/Writer
• PrintWriter
• ObjectOutputStream/InputStream

????????????????????????????????????????
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????????
????????????????????(??????????????????????)
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java.io????????
???????????????????? ????????????????????

1. ???????????????????????????????
2. ??????????????????

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???????

1. ????InputStream/OutputStream????????
   (ObjectOutputStream/InputStream??)?)FileInputStre
   am?ByteArrayInputStream
2. ???Reader/Writer?????????)FileReader?CharArrayWr
   iter
3. ??????ObjectOutputStream/InputStream

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????

1. ????FileOutputStream/InputStream/Reader/Writer
2. StringStringReader/Writer(String????????Stream??
   ????)
3. ???????InputStreamReader

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???
??????????????????

• FileReader
• ObjectInputStream
• ByteArrayOutputStream

?????????????????
??????????????
?????byte????????????
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??????????

• BufferedReader ????????????????????
  ??????????????????? ???????
• PrintWriter ?????????????????? ????????????????

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???
BufferedReader br new BufferdeReader(new
InputStream(System.in)) String ??br.readLine()
?????????????????????????????
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????
PrintWriter pw new PrintWriter(new
FileWriter("test.txt")) pw.println("test")
??????????????????????????
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???
Java.io?????????????????????????????????
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?????
?????????????????? ???????????????? ?????????
???????