Java 如何使用JSoup从网站获取多个表
我需要把9张桌子都弄下来: 我当前的代码只包含一个表。我将.first()切换到.last(),但这不起作用。我尝试使用(“table.totals”)按名称获取一个表,但也失败了Java 如何使用JSoup从网站获取多个表,java,jsoup,Java,Jsoup,我需要把9张桌子都弄下来: 我当前的代码只包含一个表。我将.first()切换到.last(),但这不起作用。我尝试使用(“table.totals”)按名称获取一个表,但也失败了 public static void getData(String url) throws IOException { String fileName = "table.csv"; FileWriter writer = new FileWriter(fileName); Document
public static void getData(String url) throws IOException
{
String fileName = "table.csv";
FileWriter writer = new FileWriter(fileName);
Document doc = Jsoup.connect(url).get();
Element tableElement = doc.select("table").first();
System.out.println(doc);
Elements tableHeaderEles = tableElement.select("thead tr th");
for (int i = 0; i < tableHeaderEles.size(); i++) {
writer.append(tableHeaderEles.get(i).text());
if(i != tableHeaderEles.size() -1){
writer.append(',');
}
}
writer.append('\n');
System.out.println();
Elements tableRowElements = tableElement.select(":not(thead) tr");
for (int i = 0; i < tableRowElements.size(); i++) {
Element row = tableRowElements.get(i);
Elements rowItems = row.select("td");
for (int j = 0; j < rowItems.size(); j++) {
writer.append(rowItems.get(j).text());
if(j != rowItems.size() -1){
writer.append(',');
}
}
writer.append('\n');
}
writer.close();
}
您已经选择了所有表,但只显式获得第一个表:
Element tableElement = doc.select("table").first();
相反,您可以轻松地对所有这些文件进行迭代:
Elements tableElements = doc.select("table");
for (Element tableElement : tableElements) {
// for each of selected tables
}
因此,经过一些修改以获得唯一文件名后,代码将如下所示:
public static void getData(String url) throws IOException {
String html = Jsoup.connect(url).execute().body();
// this one is tricky as it contains tables as commented out HTML, and shows them using javascript code
// so I'm using dirty replace to remove comment tags before parsing to make tables visible to Jsoup
html = html.replaceAll("<!--", "");
html = html.replaceAll("-->", "");
Document doc = Jsoup.parse(html);
Elements tableElements = doc.select("table");
int number = 1;
for (Element tableElement : tableElements) {
String tableId = tableElement.id();
if (tableId.isEmpty()) {
// skip table without id
continue;
}
tableId = " with id " + tableId;
String fileName = "table" + number++ + tableId + ".csv";
FileWriter writer = new FileWriter(fileName);
System.out.println(doc);
Elements tableHeaderEles = tableElement.select("thead tr th");
for (int i = 0; i < tableHeaderEles.size(); i++) {
writer.append(tableHeaderEles.get(i).text());
if (i != tableHeaderEles.size() - 1) {
writer.append(',');
}
}
writer.append('\n');
System.out.println();
Elements tableRowElements = tableElement.select(":not(thead) tr");
for (int i = 0; i < tableRowElements.size(); i++) {
Element row = tableRowElements.get(i);
Elements rowItems = row.select("td");
for (int j = 0; j < rowItems.size(); j++) {
writer.append(rowItems.get(j).text());
if (j != rowItems.size() - 1) {
writer.append(',');
}
}
writer.append('\n');
}
writer.close();
}
}
选择id为高级的表的第一个表:
Element tableElement = doc.select("table#advanced").first();
补充意见:
作为参数提供给
选择(…)
的内容是。是否要将每个表保存在不同的csv文件中?或者。相同的文件还是不同的,这对你有用吗?对我来说,它做了完全相同的事情。抓起一张桌子。使用您发布的内容,我更新了代码,并添加了注释和详细解释。
Element tableElement = doc.select("table").first();
Element tableElement = doc.select("table#advanced").first();