java - 在java中使用jsoup

Question

public static void main(String[] args) throws IOException {
           for (int i=21;i<30;i++){
               path="https://www.super.kg/media/audio/"+i;
               Document dc = Jsoup.connect(path).timeout(6000).get();
               Elements body = dc.select("div.clear");

               for (Element item : body) {
                   String    method = item.select("div.media_mtspan.video_desc_text").html();
                   method= method.replaceAll("<br>", "\n");
                   System.out.println(method);

                   PrintWriter writer = new PrintWriter("C:\\Users\\cholp\\Desktop\\out.txt", "UTF-8");
                    writer.println(method);
                    writer.close();
                }

            } 
}

请帮助我，无法将变量“方法”写入文件。运行程序后，文件中没有任何内容

Answer 1

问题是这样的:

    for (Element item : body) {
        String method = item.select("div.media_mtspan.video_desc_text").html();
        method = method.replaceAll("<br>", "\n");
        System.out.println(method);

        // Here
        PrintWriter writer = new PrintWriter("C:\\Users\\cholp\\Desktop\\out.txt", "UTF-8");
        writer.println(method);
        writer.close();
    }

PrintWriter(String fileName) 将使用以下代码构造一个 PrintWriter 实例:

public PrintWriter(String fileName) throws FileNotFoundException {
    this(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fileName))),
         false);
}

默认情况下，FileOutputStream 会截断文件并打印内容(method)，因此最后一个 method 将在文件，并且最后一个方法恰好是空的，所以看起来写不通，但实际上确实可以，要解决这个问题，尝试替换 new PrintWriter("C:\\Users\\cholp\\Desktop\\out.txt", "UTF-8") 与 new PrintWriter(new BufferedWriter(new OutputStreamWriter(new FileOutputStream("C:\\Users\\cholp\\Desktop\\out.txt")、"UTF-8"))、/*append*/true)，或者更好，将编写器从 for 循环中拉出:

    PrintWriter writer = new PrintWriter("C:\\Users\\cholp\\Desktop\\out.txt", "UTF-8");

    for (Element item : body) {
        String method = item.select("div.media_mtspan.video_desc_text").html();
        method = method.replaceAll("<br>", "\n");
        System.out.println(method);

        writer.append(method);
    }

    writer.close();