這裏的圖書館的作者。首先你需要定義字段位置。由於您想要解析多行中出現的值,因此您必須將recordEndsOnNewLine
設置爲false
,以便您處於正確的軌道。
它更容易「看」每個記錄開始的位置和結束,如果你加入的是形成一個單一的記錄行:
String input = "" +
"AA1234 data\nBBmore data\nCCsome more data row 1 ended\n" +
"AA5678 data\nBBmore data\nCCsome more data row 2 ended";
給你提供了以下字段配置可以創建的例子(我假設你不想要的 「AA」, 「BB」 和 「CC」 的字符串):
FixedWidthFields fields = new FixedWidthFields();
fields
.addField("a1", 2, 6)
.addField("a2", 7, 11)
.addField("b1", 14, 23)
.addField("c1", 26, 40)
.addField("c2", 41, 52);
你還可以用這個分析你輸入:
FixedWidthParserSettings settings = new FixedWidthParserSettings(fields);
settings.getFormat().setLineSeparator("\n");
settings.setRecordEndsOnNewline(false);
FixedWidthParser parser = new FixedWidthParser(settings);
List<String[]> rows = parser.parseAll(new StringReader(input));
for (String[] row : rows) {
System.out.println(Arrays.toString(row));
}
這會給你正確的輸出:
[1234, data, more data, some more data, row 1 ended]
[5678, data, more data, some more data, row 2 ended]
現在我們知道每個字段的開始和結束,我們可以定義的Java Bean:
public static class Bean {
@FixedWidth(from = 2, to = 6)
@Parsed
int a1;
@FixedWidth(from = 7, to = 11)
@Parsed
String a2;
@FixedWidth(from = 14, to = 23)
@Parsed
String b1;
@FixedWidth(from = 26, to = 40)
@Parsed
String c1;
@FixedWidth(from = 41, to = 52)
@Parsed
String c2;
@Override
public String toString() {
return "Bean{" +
"a1=" + a1 +
", a2='" + a2 + '\'' +
", b1='" + b1 + '\'' +
", c1='" + c1 + '\'' +
", c2='" + c2 + '\'' +
'}';
}
}
隨着那準備,解析輸入變就這麼簡單:
FixedWidthParserSettings settings = new FixedWidthParserSettings();
settings.getFormat().setLineSeparator("\n");
settings.setRecordEndsOnNewline(false);
settings.setHeaderExtractionEnabled(false); // This one is important as your input has no headers.
FixedWidthRoutines routines = new FixedWidthRoutines(settings);
for(Bean bean : routines.parseAll(Bean.class, new StringReader(input))){
System.out.println(bean);
}
,它將打印豆子一樣,輸出:
Bean{a1=1234, a2='data', b1='more data', c1='some more data', c2='row 1 ended'}
Bean{a1=5678, a2='data', b1='more data', c1='some more data', c2='row 2 ended'}
希望這會有幫助