我已经研究了很多关于servlet的内容，并且已经创建了一个应该从我的Web应用程序中获得一些职位的应用程序，但是由于缺乏servlet的经验，所以我不知道如何解决它。另外，我也不知道应该将HTML应用程序放置在哪里，听说它应该位于WebContent文件夹中，并且确实存在，但是它不起作用。你可以帮帮我吗？
更新：我正在尝试上传一些信息，这些信息将由我的servlet转换为txt文件，以避免每个用户上传文件：“ ...我已经创建了一个应该从我的Web应用程序接收某些职位的文件... “
服务器：Apache Tomcat上7.0
的Eclipse EE火星
在此先感谢。
我的整个项目在这里：DropBox
PS：我仅在下面发布了该代码段以供观察，但是我不能使用脚本，因为我不拥有这些库所在的企业，如果要查看它，请在此PostScript上方的链接上进行检查。
我的AJAX HTML
<body>
<div id="navgrid">
<div id="header">Header</div>
<div id="tree1">
<ul class="jqtree_common jqtree-tree">
<li class="jqtree_common jqtree-folder">
<div class="jqtree-element jqtree_common"><a class="jqtree_common jqtree-toggler">â–¼</a><span class="jqtree_common jqtree-title jqtree-title-folder">node1</span>
</div>
<ul class="jqtree_common ">
<li class="jqtree_common">
<div class="jqtree-element jqtree_common"><span class="jqtree-title jqtree_common">child1</span>
</div>
</li>
<li class="jqtree_common">
<div class="jqtree-element jqtree_common"><span class="jqtree-title jqtree_common">child2</span>
</div>
</li>
</ul>
</li>
<li class="jqtree_common jqtree-folder">
<div class="jqtree-element jqtree_common"><a class="jqtree_common jqtree-toggler">â–¼</a><span class="jqtree_common jqtree-title jqtree-title-folder">node2</span>
</div>
<ul class="jqtree_common ">
<li class="jqtree_common">
<div class="jqtree-element jqtree_common"><span class="jqtree-title jqtree_common">child3</span>
</div>
</li>
</ul>
</li>
</ul>
</div>
</div>
<script type="text/javascript">
</script>
<script>
$(document).ready(function() {
var POSITIONS;
//var data is a dynamic JSON file that should be created in the backend.
var data = [{
label: 'node1',
id: 1,
children: [{
label: 'child1',
id: 2
}, {
label: 'child2',
id: 3
}]
}, {
label: 'node2',
id: 4,
children: [{
label: 'child3',
id: 5
}]
}];
$('#tree1').tree({
data: data,
autoOpen: true,
dragAndDrop: true
});
console.log($('#tree1').tree('toJson')); //This will give you the loading jqtree structure.
$('#tree1').bind(
'tree.move',
function(event) {
event.preventDefault();
// do the move first, and _then_ POST back.
event.move_info.do_move();
console.log($(this).tree('toJson')); //this will give you the latest tree.
POSITIONS = $(this).tree('toJson');
alert(POSITIONS);
$.post('http://sistema.agrosys.com.br/sistema/labs/CSS_HTML/', {
tree: $(this).tree('toJson')
});
alert("done"); //this will post the json of the latest tree structure.
}
);
var data = new FormData();
data.append("JqTree", POSITIONS);
alert('Sending: ' + POSITIONS);
$.ajax({
url: '/JqTree',
type: 'POST',
data: data,
cache: false,
dataType: 'json',
processData: false,
contentType: false,
success: function(response) {
alert("file has been successfully sent\n\n" + POSITIONS);
},
error: function(jqXHR, textStatus, errorThrown) {
alert('ERRORS: ' + textStatus);
}
});
});
</script>
</body>
我的Servlet
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Hello extends HttpServlet {
private static final long serialVersionUID = 1L;
public Hello() {}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out=response.getWriter();
out.print("<html><body>");
out.print("<h3>Hello Servlet</h3>");
out.print("</body></html>");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String position = request.getParameter("JqTree");
PrintWriter writer = new PrintWriter("Positions.txt", "UTF-8");
writer.println(position);
writer.close();
}
}
和我的web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>JqTree</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<display-name>Hello</display-name>
<servlet-name>Hello</servlet-name>
<servlet-class>Hello</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Hello</servlet-name>
<url-pattern>/Hello</url-pattern>
</servlet-mapping>
</web-app>
您需要将AJAX调用更改为
$.ajax({
url: '/JqTree/Hello',
这里/JqTree是你的Web应用程序的上下文根，再加上/Hello这是<url-pattern>配置为您Hello在servlet/WEB-INF/web.xml文件。
$.ajax()呼叫正在使用中，post因此您必须记住只有doPost()被呼叫。doPost()没有返回任何输出，但您的$.ajax()电话希望dataType: 'json'返回。有时这可能会导致请求静默失败。request.getParameter()。multipart/form-data无论您是在Servlet 3.0还是2.x容器下运行，您都必须以不同的方式编写Servlet代码以进行处理。本文收集自互联网，转载请注明来源。
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我来说两句