Java 无法使用jquery AJAX将表单数据从JSP页面发送到Servlet
尝试使用jQueryAjax将POST数据从JSP文件发送到servlet，但在servlet POST请求中获得空值 在JSP页面上，在控制台中它显示正确的数据，在post请求中它向我显示它正在发送数据，我已经在mozilla中使用firebug检查了这一点。但是在servlet中获取空值 JSP代码：Java 无法使用jquery AJAX将表单数据从JSP页面发送到Servlet,java,jquery,ajax,jsp,servlets,Java,Jquery,Ajax,Jsp,Servlets,尝试使用jQueryAjax将POST数据从JSP文件发送到servlet，但在servlet POST请求中获得空值 在JSP页面上，在控制台中它显示正确的数据，在post请求中它向我显示它正在发送数据，我已经在mozilla中使用firebug检查了这一点。但是在servlet中获取空值 JSP代码： <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<script src="js/jquery-1.8.3.js" type="text/javascript"></script>
<script type="text/javascript" src="js/jquery-ui-1.8.24.js"></script>
<script type="text/javascript">
$( document ).ready(function() {
alert("DOM is ready");
});
function qry()
{
var fd = new FormData();
var tinfo=$("#tablename").val();
var cinfo=$("#columnname").val();
var oinfo=$("#operator").val();
var uinfo=$("#txtuserinput").val();
console.log(tinfo);
console.log(cinfo);
console.log(oinfo);
console.log(uinfo);
fd.append("abc",tinfo);
fd.append("mycolumnname",cinfo);
fd.append("myoperator",oinfo);
fd.append("mytxtuserinput",uinfo);
$.ajax({
type: 'POST',
url: "http://localhost:8084/NavigatingApp/getInfo/queryoutput",
contentType: false,
dataType: "html",
data: fd,
async:false,
cache: false,
processData: false,
success:function(data){
console.log(data);
},
error:function(){
alert("Error in receving data...!!!");
}
});
}
</script>
</head>
<body>
<h1>Hello World!</h1>
<select name="tablename" id="tablename" >
<option value="tbl1">tbl1</option>
<option value="tbl2">tbl2</option>
<option value="tbl3">tbl3</option>
</select>
<select name="columnname" id="columnname">
<option value="col1">col1</option>
<option value="col2">col2</option>
<option value="col3">col3</option>
</select>
<select name="operator" id="operator">
<option value="op1">op1</option>
<option value="op2">op2</option>
<option value="op3">op3</option>
</select>
<select name="condition" id="condition" >
<option value="condtn1">condtn1</option>
<option value="condtn2">condtn2</option>
<option value="condtn3">condtn3</option>
</select>
<input type="text" name="txtuserinput" id="txtuserinput" />
<input type="button" value="search" id="btnsearch" onclick="qry();" />
</body>
</html>
您根本没有发送数据 数据：fd 尝试
数据：{fd:fd}如果我做了数据：{fd:fd}，它就不会发送ajax请求。我也有同样的问题。你找到解决办法了吗？
@WebServlet(name = "queryoutput", urlPatterns = {"/queryoutput"})
public class QueryOutput extends HttpServlet {
public QueryOutput() {
super();
// TODO Auto-generated constructor stubatavu
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("application/json;charset=UTF-8");
System.out.println(" inside do post table::" +request.getParameter("mytablename"));
System.out.println(" inside do post col name:: " +request.getParameter("mycolumnname"));
System.out.println(" inside do post operator::" +request.getParameter("myoperator"));
System.out.println(" inside do post user input::" +request.getParameter("mytxtuserinput"));
response.setContentType("application/json;charset=UTF-8");
PrintWriter out=response.getWriter();
out.flush();
}
}