Question

我正在尝试通过Java格式化sql输出，而我以前从未在Java中格式化过。我看了一些教程，但似乎找不到任何能帮助我解决问题的东西。我要删掉大部分代码，所以代码不是很多，但这就是我所拥有的。

    File file = new File("WO_SECURITY.doc");
    FileWriter fw = new FileWriter(file, false);  
    BufferedWriter bw = new BufferedWriter(fw);
    try {
    Class.forName("com.ibm.as400.access.AS400JDBCDriver");
    con = DriverManager.getConnection(url,username1,password);

    stmt = con.createStatement();
    rs = stmt.executeQuery("select usname as Name,                                   \r\n" + 
            "ususer as Username,                                      \r\n" + 
            "uswosecl as WO_SecurityLevel,                            \r\n" + 
            " aoOpid as Operation_ID,aoseclevel as Operation_Security,\r\n" + 
            "aomenu as Menu, aomenuitem as Tab, aoText as Description \r\n" + 
            "from cudtatet.xxpuser                                    \r\n" + 
            "join fmsusrfua.xxpAuOps on uswosecl >= aoseclevel        \r\n" + 
            "and aoseclevel >=0                                       \r\n" + 
            "WHERE ususer NOT IN ('*ALL','daffron')                   \r\n" + 
            "and aoAuOpID>=70000 and aoAuOpID < 80000                 \r\n" + 
            "order by usname,ususer                                   ");
  while (rs.next()) {   

      String name = rs.getString(1);
      String username = rs.getString(2);
      String woSeclevel = rs.getString(3);
      String menu = rs.getString(6);
      String tab = rs.getString(7);
      String Desc = rs.getString(8);

            if(!file.exists()) {
                file.createNewFile();
            }


            bw.write("Employee Name: " + name);             
            bw.newLine();
            bw.write("Employee username: " + username);
            bw.newLine();
            bw.write("WO Security Level:  " + woSeclevel);
            bw.newLine();
            bw.write("Menu: " + menu + " > ");
            bw.write(tab + " > ");
            bw.write(Desc);
            bw.newLine();
            bw.newLine();
  }

我知道它是多余的，而不是我想要写入文本文件的输出。我在文本文件上收到的当前输出是。

如果可能，我希望将其格式化为一次以列标题的形式显示员工名称，用户名和安全级别，并在其下方显示菜单，菜单选项卡和菜单说明。我想要的输出：

如果我能获得有关如何格式化输出以获取所需输出的指导，那将是很棒的！

Answer 1

我认为解决方案的一部分是：

将输出移动到单独的方法（使阅读更容易）
跟踪正在使用的名称。

因此，对于输出，您可以考虑：

private void outputHeader(Writer out, String name, String username, String woSeclevel)
  throws IOException
{
    String hdr = String.format("Employee Name: %s  Username: %s  "
            + "WO Security Level %s%n",
            name, 
            username,
            woSeclevel);

    out.write(hdr);
}

private void ouputLine(Writer out, String menu, String tab, String desc)
    throws IOException
{
    String line = String.format("Menu: %s > %s > %s%n",
                                menu,
                                tab,
                                desc);
    out.write(line);
}

然后您可以这样称呼它：

String lastUsername = null;

while (rs.next) {
        String name = rs.getString(1);
        String username = rs.getString(2);
        String woSeclevel = rs.getString(3);
        String menu = rs.getString(6);
        String tab = rs.getString(7);
        String Desc = rs.getString(8);

        // when we change users (or if we haven't seen any user yet)
        // then output the header
        // if we have processed at least one user, then put space between
        // the last output and the new header
        if (lastUsername == null || ! lastUsername.equals(username)) {
            if (lastUsername != null) {
                bw.write("\n\n");
            }

            outputHeader(bw, name, username, woSeclevel);
        }
        outputLine(bw, menu, tab, Desc);

        // EDIT: this was wrong originally
        // we want to update the last seen username to be the username
        // of the current record; when the next record is retrieved, then
        // the comparison will output a new header if we have moved to
        // a different username. NOTE: assumes the records are properly
        // ordered
        lastUsername = username;
}

通过这种方式，每次用户名更改时都会发出用户的标题（我认为这是更独特的名称本身），而用户的菜单信息将位于标题下方。

请注意，您可能想先按用户名订购。

Java如何格式化要写入文本文件的输出

1 个答案: