在Java的System.out中以表格格式输出

我从数据库中获取结果，并希望以Java的标准输出中的表格forms输出数据

我试过使用\ t但我想要的第一列是非常可变的长度。

有没有办法显示在一个很好的表，如输出？

Answer 1

使用System.out.format 。 你可以设置这样的字段长度：

 System.out.format("%32s%10d%16s", string1, int1, string2); 

这将填充string1 ， int1和string2为int1和16个字符。

有关语法的更多信息，请参阅Javadocs for java.util.Formatter （ System.out.format内部使用Formatter ）。

Answer 2

使用j-text-utils你可以打印来控制一个表，如：

而且这很简单：

 TextTable tt = new TextTable(columnNames, data); tt.printTable(); 

该API还允许sorting和行编号…

Answer 3

我创build了一个可以构build高级表视图的项目。 如果你打印表格，表格的宽度将有一个限制。 我已经将其应用到我自己的项目中，以获得客户发票打印。 以下是打印视图的一个例子。

  PLATINUM COMPUTERS(PVT) LTD NO 20/B, Main Street, Kandy, Sri Lanka. Land: 812254630 Mob: [phone] Fax: [phone] CUSTOMER INVOICE +-----------------------+----------------------+ |INFO |CUSTOMER | +-----------------------+----------------------+ |DATE: 2015-9-8 |ModernTec Distributors| |TIME: 10:53:AM |MOB: [phone] | |BILL NO: 12 |ADDRES: No 25, Main St| |INVOICE NO: 458-80-108 |reet, Kandy. | +-----------------------+----------------------+ | SELLING DETAILS | +-----------------+---------+-----+------------+ |ITEM | PRICE($)| QTY| VALUE| +-----------------+---------+-----+------------+ |Optical mouse | 120.00| 20| 2400.00| |Gaming keyboard | 550.00| 30| 16500.00| |320GB SATA HDD | 220.00| 32| 7040.00| |500GB SATA HDD | 274.00| 13| 3562.00| |1TB SATA HDD | 437.00| 11| 4807.00| |RE-DVD ROM | 144.00| 29| 4176.00| |DDR3 4GB RAM | 143.00| 13| 1859.00| |Blu-ray DVD | 94.00| 28| 2632.00| |WR-DVD | 122.00| 34| 4148.00| |Adapter | 543.00| 28| 15204.00| +-----------------+---------+-----+------------+ | RETURNING DETAILS | +-----------------+---------+-----+------------+ |ITEM | PRICE($)| QTY| VALUE| +-----------------+---------+-----+------------+ |320GB SATA HDD | 220.00| 4| 880.00| |WR-DVD | 122.00| 7| 854.00| |1TB SATA HDD | 437.00| 7| 3059.00| |RE-DVD ROM | 144.00| 4| 576.00| |Gaming keyboard | 550.00| 6| 3300.00| |DDR3 4GB RAM | 143.00| 7| 1001.00| +-----------------+---------+-----+------------+ GROSS 59,928.00 DISCOUNT(5%) 2,996.40 RETURN 9,670.00 PAYABLE 47,261.60 CASH 20,000.00 CHEQUE 15,000.00 CREDIT(BALANCE) 12,261.60 --------------------- --------------------- CASH COLLECTOR GOODS RECEIVED BY soulution by clough.com 

这是上面的打印视图的代码，你可以在这里find图书馆（Wagu）。

Answer 4

看一下这个。 作者提供了一个简单而优雅的解决scheme，不需要任何第三方库。 http://www.ksmpartners.com/2013/08/nicely-formatted-tabular-output-in-java/

Answer 5

我可能会很晚，但这里有一个简单而通用的解决scheme

 import java.io.BufferedWriter; import java.io.FileWriter; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Random; import java.util.UUID; public class TableGenerator { private int PADDING_SIZE = 2; private String NEW_LINE = "\n"; private String TABLE_JOINT_SYMBOL = "+"; private String TABLE_V_SPLIT_SYMBOL = "|"; private String TABLE_H_SPLIT_SYMBOL = "-"; public String generateTable(List<String> headersList, List<List<String>> rowsList,int... overRiddenHeaderHeight) { StringBuilder stringBuilder = new StringBuilder(); int rowHeight = overRiddenHeaderHeight.length > 0 ? overRiddenHeaderHeight[0] : 1; Map<Integer,Integer> columnMaxWidthMapping = getMaximumWidhtofTable(headersList, rowsList); stringBuilder.append(NEW_LINE); stringBuilder.append(NEW_LINE); createRowLine(stringBuilder, headersList.size(), columnMaxWidthMapping); stringBuilder.append(NEW_LINE); for (int headerIndex = 0; headerIndex < headersList.size(); headerIndex++) { fillCell(stringBuilder, headersList.get(headerIndex), headerIndex, columnMaxWidthMapping); } stringBuilder.append(NEW_LINE); createRowLine(stringBuilder, headersList.size(), columnMaxWidthMapping); for (List<String> row : rowsList) { for (int i = 0; i < rowHeight; i++) { stringBuilder.append(NEW_LINE); } for (int cellIndex = 0; cellIndex < row.size(); cellIndex++) { fillCell(stringBuilder, row.get(cellIndex), cellIndex, columnMaxWidthMapping); } } stringBuilder.append(NEW_LINE); createRowLine(stringBuilder, headersList.size(), columnMaxWidthMapping); stringBuilder.append(NEW_LINE); stringBuilder.append(NEW_LINE); return stringBuilder.toString(); } private void fillSpace(StringBuilder stringBuilder, int length) { for (int i = 0; i < length; i++) { stringBuilder.append(" "); } } private void createRowLine(StringBuilder stringBuilder,int headersListSize, Map<Integer,Integer> columnMaxWidthMapping) { for (int i = 0; i < headersListSize; i++) { if(i == 0) { stringBuilder.append(TABLE_JOINT_SYMBOL); } for (int j = 0; j < columnMaxWidthMapping.get(i) + PADDING_SIZE * 2 ; j++) { stringBuilder.append(TABLE_H_SPLIT_SYMBOL); } stringBuilder.append(TABLE_JOINT_SYMBOL); } } private Map<Integer,Integer> getMaximumWidhtofTable(List<String> headersList, List<List<String>> rowsList) { Map<Integer,Integer> columnMaxWidthMapping = new HashMap<>(); for (int columnIndex = 0; columnIndex < headersList.size(); columnIndex++) { columnMaxWidthMapping.put(columnIndex, 0); } for (int columnIndex = 0; columnIndex < headersList.size(); columnIndex++) { if(headersList.get(columnIndex).length() > columnMaxWidthMapping.get(columnIndex)) { columnMaxWidthMapping.put(columnIndex, headersList.get(columnIndex).length()); } } for (List<String> row : rowsList) { for (int columnIndex = 0; columnIndex < row.size(); columnIndex++) { if(row.get(columnIndex).length() > columnMaxWidthMapping.get(columnIndex)) { columnMaxWidthMapping.put(columnIndex, row.get(columnIndex).length()); } } } for (int columnIndex = 0; columnIndex < headersList.size(); columnIndex++) { if(columnMaxWidthMapping.get(columnIndex) % 2 != 0) { columnMaxWidthMapping.put(columnIndex, columnMaxWidthMapping.get(columnIndex) + 1); } } return columnMaxWidthMapping; } private int getOptimumCellPadding(int cellIndex,int datalength,Map<Integer,Integer> columnMaxWidthMapping,int cellPaddingSize) { if(datalength % 2 != 0) { datalength++; } if(datalength < columnMaxWidthMapping.get(cellIndex)) { cellPaddingSize = cellPaddingSize + (columnMaxWidthMapping.get(cellIndex) - datalength) / 2; } return cellPaddingSize; } private void fillCell(StringBuilder stringBuilder,String cell,int cellIndex,Map<Integer,Integer> columnMaxWidthMapping) { int cellPaddingSize = getOptimumCellPadding(cellIndex, cell.length(), columnMaxWidthMapping, PADDING_SIZE); if(cellIndex == 0) { stringBuilder.append(TABLE_V_SPLIT_SYMBOL); } fillSpace(stringBuilder, cellPaddingSize); stringBuilder.append(cell); if(cell.length() % 2 != 0) { stringBuilder.append(" "); } fillSpace(stringBuilder, cellPaddingSize); stringBuilder.append(TABLE_V_SPLIT_SYMBOL); } } 

用这种输出

 +----------------------------------------+----------------------------------------+----------------------------------------+----------------------------------------+ | Id | F-Name | L-Name | email | +----------------------------------------+----------------------------------------+----------------------------------------+----------------------------------------+ | 70a56f25-d42a-499c-83ac-50188c45a0ac | aa04285e-c135-46e2-9f90-988bf7796cd0 | ac495ba7-d3c7-463c-8c24-9ffde67324bc | f6b5851b-41e0-4a4e-a237-74f8e0bff9ab | | 6de181ca-919a-4425-a753-78d2de1038ef | c4ba5771-ccee-416e-aebd-ef94b07f4fa2 | 365980cb-e23a-4513-a895-77658f130135 | 69e01da1-078e-4934-afb0-5afd6ee166ac | | f3285f33-5083-4881-a8b4-c8ae10372a6c | 46df25ed-fa0f-42a4-9181-a0528bc593f6 | d24016bf-a03f-424d-9a8f-9a7b7388fd85 | 4b976794-aac1-441e-8bd2-78f5ccbbd653 | | ab799acb-a582-45e7-ba2f-806948967e6c | d019438d-0a75-48bc-977b-9560de4e033e | 8cb2ad11-978b-4a67-a87e-439d0a21ef99 | 2f2d9a39-9d95-4a5a-993f-ceedd5ff9953 | | 78a68c0a-a824-42e8-b8a8-3bdd8a89e773 | 0f030c1b-2069-4c1a-bf7d-f23d1e291d2a | 7f647cb4-a22e-46d2-8c96-0c09981773b1 | 0bc944ef-c1a7-4dd1-9eef-915712035a74 | +----------------------------------------+----------------------------------------+----------------------------------------+----------------------------------------+ 

Answer 6

检查出类java.util.Formatter 。

Answer 7

 public class Main { public static void main(String args[]) { String format = "|%1$-10s|%2$-10s|%3$-20s|\n"; System.out.format(format, "A", "AA", "AAA"); System.out.format(format, "B", "", "BBBBB"); System.out.format(format, "C", "CCCCC", "CCCCCCCC"); String ex[] = { "E", "EEEEEEEEEE", "E" }; System.out.format(String.format(format, (Object[]) ex)); } } 

input大小的差异不影响输出