大家好！我在开发一个小 web 应用程序时遇到了问题。目标是从服务器上的声明文件夹中搜索文件中的特定单词。
为此，我使用 java.io.File 和 BufferReader 实现了递归算法。当我得到结果时，我使用我的 jsp 文件中的脚本将它们放在一个表中：
// Posting founded files in a table.
var files = response.getElementsByTagName("file");
// -> Creating the results table.
var table = "<table width=\"100%\">\n";
for (var i = 0, c = files.length; i < c; i++) {
// -> Building the number of apparence in each file.
var nb = files[i].getAttribute("nb");
var nbSentence = "";
if (nb == 1) { nbSentence = nb + " time in this file."; }
else { nbSentence = nb + " times in this file."; }
// Building and filling the table.
if (i % 2 == 0) { table += "<tr class=\"pair\"><td><a href=" + files[i].firstChild.nodeValue + " target=\"_blank\" >"
+ files[i].getAttribute("name") + "</a></td><td>" + nbSentence + "</td></tr>\n"; }
else { table += "<tr class=\"impair\"><td><a href=" + files[i].firstChild.nodeValue + " target=\"_blank\" >"
+ files[i].getAttribute("name") + "</a></td><td>" + nbSentence + "</td></tr>\n"; }
}
table += "</table>\n";
// -> To end the procedure, we had the table to the right div.
document.getElementById("files").innerHTML = table;
我的问题是，使用此代码，所有结果都会一次性打印在目标表中。每次在算法中找到一个文件时，我都想一一看到结果。
我试图在 onreadystatestage 函数中将 readystate 更改为“3”：
xhr.onreadystatechange = function() {
if (xhr.readyState >= 3 && (xhr.status == 200 || xhr.status == 0)) {
callback(xhr.responseXML);
document.getElementById("loader").style.display = "none";
document.getElementById("btn").value = "Search";
} else if (xhr.readyState < 3) {
document.getElementById("loader").style.display = "inline";
document.getElementById("btn").value = "Cancel";
}
};
但这并没有改变任何东西。有人有想法吗？我怎样才能一个一个地发送每个创建的文件？我必须在 servlet 类中这样做吗？
servlet 类中的 for 指令：
// If the input word name isn't empty, the algorithm is launched.
if (null != wordToSearch && !"".equals(wordToSearch))
{
lstFiles.clear();
searching(new File(contextPath), wordToSearch);
int n = lstFiles.size();
// Priting a message that indicate how many files have been found with the word to search.
emptyFieldMessage = n + " files has been found containing the word '" + wordToSearch + "'!";
output.append("<message>").append(emptyFieldMessage).append("</message>\n");
output.append("<lstFiles>\n");
// Then, files list with :
// - File path in "name" parameter,
// - Number of apparence of the word in "nb" parameter,
// - Formatted path as the value.
for(int i = 0; i < n; i++)
{
output.append("<file name=\"" + lstFiles.get(i) + "\" nb=\"" + lstNbApparence.get(i) + "\" >").append(lstFilesPath.get(i)).append("</file>\n");
}
output.append("</lstFiles>\n");
}
为了更完整，整个脚本代码：
<script>
// Creating xhr variable.
var xhr = null;
// Creating the "Search" button function.
function request(callback) {
// "Cancel" button case.
if (xhr && xhr.readyState != 0)
{
xhr.abort();
}
// "Search" button case.
else
{
// Calling the good function from external file.
xhr = getXMLHttpRequest();
// Callback and loading icon management.
xhr.onreadystatechange = function() {
if (xhr.readyState >= 3 && (xhr.status == 200 || xhr.status == 0)) {
callback(xhr.responseXML);
document.getElementById("loader").style.display = "none";
document.getElementById("btn").value = "Search";
} else if (xhr.readyState < 3) {
document.getElementById("loader").style.display = "inline";
document.getElementById("btn").value = "Cancel";
}
};
// Calling the Servlet in charge of the recursion algorithm.
var input = encodeURIComponent(document.getElementById("wordName").value);
xhr.open("GET", "/webApp_Search_Merge/ActionServlet?wordName=" + input, true);
xhr.send(null);
}
}
// Creating the reponse function.
function readData(response) {
if (null != response)
{
// Posting the message include in the XML file sending back by the Servlet.
var message = response.getElementsByTagName("message");
document.getElementById("message").innerHTML = message[0].firstChild.nodeValue;
// Posting founded files in a table.
var files = response.getElementsByTagName("file");
// -> Creating the results table.
var table = "<table width=\"100%\">\n";
for (var i = 0, c = files.length; i < c; i++) {
// -> Building the number of apparence in each file.
var nb = files[i].getAttribute("nb");
var nbSentence = "";
if (nb == 1) { nbSentence = nb + " time in this file."; }
else { nbSentence = nb + " times in this file."; }
// Building and filling the table.
if (i % 2 == 0) { table += "<tr class=\"pair\"><td><a href=" + files[i].firstChild.nodeValue + " target=\"_blank\" >"
+ files[i].getAttribute("name") + "</a></td><td>" + nbSentence + "</td></tr>\n"; }
else { table += "<tr class=\"impair\"><td><a href=" + files[i].firstChild.nodeValue + " target=\"_blank\" >"
+ files[i].getAttribute("name") + "</a></td><td>" + nbSentence + "</td></tr>\n"; }
}
table += "</table>\n";
// -> To end the procedure, we had the table to the right div.
document.getElementById("files").innerHTML = table;
}
}
提前感谢您的帮助，托马斯。