java 将 arraylist 转换为 html 表
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convert arraylist to html table
提问by Gipsy
how do i retrieve my arraylist into html table?
如何将我的数组列表检索到 html 表中？
my arraylist:
我的数组列表：
[
1, 2011-05-10, 1, 22.0,
2, 2011-05-10, 2, 5555.0,
3, 2011-05-11, 3, 123.0,
4, 2011-05-11, 2, 212.0,
5, 2011-05-30, 1, 3000.0,
6, 2011-05-30, 1, 30.0,
7, 2011-06-06, 1, 307.0,
8, 2011-06-06, 1, 307.0 ]
out.println("<html>");
out.println("<head>");
out.println("<title>Counter</title>");
out.println("</head>");
out.println("<body>");
out.println("<table border=\"1\">");
out.println("<tr>");
for (int i = 0; i < ex.getExpenses().size(); i++) {
out.println("<td>" + ex.getExpenses().get(i) + "</td>");
if (i>0 && i%4==0) {
out.println("</tr><tr>");
}
}
out.println("</tr>");
out.println("</table>");
out.println("</body>");
out.println("</html>");
this doesn't really work, since arraylist starts with 0, it gives me the table that looks like this: 
这实际上不起作用，因为 arraylist 从 0 开始，它给了我看起来像这样的表：
how do i get the table that looks like this:
我如何获得看起来像这样的表格：
1 2011-05-10 1 22.0
2 2011-05-10 2 5555.0
3 2011-05-11 3 123.0
4 2011-05-11 2 212.0
5 2011-05-30 1 3000.0
6 2011-05-30 1 30.0
7 2011-06-06 1 307.0
8 2011-06-06 1 307.0
回答by Mikita Belahlazau
Replace
代替
for (int i = 0; i < ex.getExpenses().size(); i++) {
out.println("<td>" + ex.getExpenses().get(i) + "</td>");
if (i>0 && i%4==0) {
out.println("</tr><tr>");
}
}
with
和
for (int i = 0; i < ex.getExpenses().size(); i++) {
if (i>0 && i%4==0) {
out.println("</tr><tr>");
}
out.println("<td>" + ex.getExpenses().get(i) + "</td>");
}
By the way. Create separate class Expensesthat contains 4 fields. It will be much cleaner and easier to convert this to html. You can write special separate method for converting Expensesto html table row.
顺便一提。创建Expenses包含 4 个字段的单独类。将其转换为 html 会更清晰、更容易。您可以编写特殊的单独方法来转换Expenses为 html 表行。
回答by Alexander Rafferty
Change the ito (i+1):
更改i为(i+1)：
[
1, 2011-05-10, 1, 22.0,
2, 2011-05-10, 2, 5555.0,
3, 2011-05-11, 3, 123.0,
4, 2011-05-11, 2, 212.0,
5, 2011-05-30, 1, 3000.0,
6, 2011-05-30, 1, 30.0,
7, 2011-06-06, 1, 307.0,
8, 2011-06-06, 1, 307.0 ]
out.println("<html>");
out.println("<head>");
out.println("<title>Counter</title>");
out.println("</head>");
out.println("<body>");
out.println("<table border=\"1\">");
out.println("<tr>");
for (int i = 0; i < ex.getExpenses().size(); i++) {
out.println("<td>" + ex.getExpenses().get(i) + "</td>");
if (i>0 && (i+1)%4==0) {
out.println("</tr><tr>");
}
}
out.println("</tr>");
out.println("</table>");
out.println("</body>");
out.println("</html>");
回答by Kousalik
first thing: Get arrylist into separate variable and then itarate it with foreach, instead of calling get() and get(i) repeatedly, then change your if condition
第一件事：将 arrylist 放入单独的变量中，然后使用 foreach 对其进行迭代，而不是重复调用 get() 和 get(i)，然后更改您的 if 条件
if ((i+1)%4==0) {
out.println("</tr><tr>");
}
second thing:
Use StringBuilderclass to concatenate output string, then print it with only one out.print
第二件事：使用StringBuilder类连接输出字符串，然后只打印一个out.print
