在 CSV 文件上写入 Java 中的 MS Access 表

如何解决在 CSV 文件上写入 Java 中的 MS Access 表

我正在编写一个小软件，可以自动将 .mdb 文件的名为“Magazzino”的表导出到 csv 文件。一切正常，我使用“ucanaccess”库编写了这段代码。

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我遇到了一个问题...我真的不明白如何在 .csv 文件上创建新行并在其上书写。我试过 package it.simonesaleri.automation.software; import java.io.*; import java.sql.*; import java.util.ArrayList; public class AutomationMain { public static void main(String[] args) throws IOException { ArrayList<String> arr = new ArrayList<String>(); try { //opening CONNECTION TO DATABASE Connection conn = DriverManager.getConnection("jdbc:ucanaccess://eCommerce.mdb"); FileWriter writer = new FileWriter("eCommerce.csv"); System.out.println("Connection to Database"); Statement s = conn.createStatement(); //sql INJECT CODE String sqlString = "SELECT * FROM Magazzino"; ResultSet rs = s.executeQuery(sqlString); ResultSetMetaData rsmd = rs.getMetaData(); int columnsNumber = rsmd.getColumnCount(); while (rs.next()) { for (int i = 1; i < columnsNumber; i++) { System.out.println(rs.getString(i)); arr.add(rs.getString(i)); } } //SAVING INTO THE FILE for(String str: arr) { writer.append(str); writer.append(";"); } writer.flush(); writer.close(); } catch (sqlException e) { // Todo Auto-generated catch block e.printstacktrace(); } } } 或 .append("\n")，但结果是这样的：

.append("\r\n")

而不是这个（我需要的结果）：

1;244;300817; BA9S - 220R  LAMPADA LED 220VAC  ROSSA;;;;;;;;;;;;;;;;12.14;3.6420000000000003;5.6451;5.463000000000001;5.098800000000001;4.7346;5.88183;PCE;22.0;IVA 22%;0.0;0.0;0.0;0.0;;731;CHINT;CHT;0;null;null;0;null;null;0;null;null;0;null;null;0;null;null;CHTCHTAUTOM-A01;;;null;null;FALSE;FALSE;TRUE;null;0;;;;;;;;;;;;;null;null;null;null;null;null;null;null;null;FALSE;FALSE;0;0;2;9713;BSD450B/8A; CONVERTITORE BrushLESS FD BSD450B/8A;;;;;;;;;;;;;;;;680.0;680.0;1054.0;1020.0;952.0;884.0;1098.2;;22.0;IVA 22%;0.0;0.0;0.0;0.0;;0;null;null;0;null;null;0;null;null;0;null;null;0;null;null;0;null;null;;;;null;null;FALSE;FALSE;TRUE;null;0;;;;;;;;;;;;;null;null;null;null;null;null;null;null;null;FALSE;FALSE;0;0;

解决方法

我想你可以这样做：

StringBuilder sb = new StringBuilder("");
while (rs.next()) {
    // Clear StringBuilder object in prep for a new CSV line
    sb.setLength(0); 
    // Create custom CSV data line using semicolon (;) as delimiter...
    for (int i = 1; i < columnsNumber; i++) {
        /* IF StringBuilder is not empty then add a semicolon
           to the end of the last piece of columnar data that 
           was appended before appending this next piece of 
           columnar data.            */
        if (!sb.toString().isEmpty()) {
            sb.append(";");
        }
        sb.append(rs.getString(i));
    }
    // Add the system newline character to custom CSV data line.
    sb.append(System.lineSeparator()); 
    // Add the newly created CSV line to the ArrayList.
    arr.add(sb.toString());
}
   
    
// Write to File...
for(String str: arr) {
    /* str already has the newline character appended 
       to it from the process above.  */
    writer.append(str); 
    // immediate write:
    writer.flush(); 
}
writer.close(); // Close the writer.