我正在从jsp向servlet发送文本值，但是在servlet中，request.getParameter（）给出了空值。下面我提到我的JSP，Servlet和web.xml
REGISTER.JSP
<form id="contactform" action="servlet/SaveInfo" method="post">
<p class="contact"><label for="email">Email</label></p>
<input id="email" name="email" placeholder="example@domain.com" required="" tabindex="1" type="email">
<p class="contact"><label for="username">User Name</label></p>
<input id="username" name="username" placeholder="username" required="" tabindex="2" type="text">
<p class="contact"><label for="password">Password</label></p>
<input type="password" id="password" name="password" required="" tabindex="3">
<p class="contact"><label for="repassword">Confirm Password</label></p>
<input type="password" id="repassword" name="repassword" required="">
<p class="contact"><label for="phone">Mobile Phone</label></p>
<input id="phone" name="phone" placeholder="phone number" required="" tabindex="4" type="text"> <br>
<p class="contact"><label for="name">Organization Name</label></p>
<input id="Orgname" name="name" placeholder="Organization name" required="" tabindex="5" type="text">
<p class="contact"><label for="Address">Address</label></p>
<input id="address" name="name" placeholder="Street,Area,city" required="" tabindex="6" type="text"> <br>
<!-- <select class="select-style" name="BirthMonth"> -->
<label>State</label><br>
<select class="select-style" name="BirthMonth">
<%
ResultSet rs = null;
Connection con = null;
PreparedStatement pmst1= null;
int countryid = 208;
try{
con = DBConnectivity.getOracleDBConnection();
pmst1 = con.prepareStatement(Sqlquery.getRegion());
pmst1.setInt(1, countryid);
rs=pmst1.executeQuery();
while(rs.next()){
String name = rs.getString("name");
%>
<option value="<%=name %>"><%=name %></option>
<% } %>
<%
}catch(Exception e){
}
%>
</select><br><br>
<p class="contact"> <input id="check" name="name" style="margin-right: 10px" type="checkbox">
<label for="name"> Not Yet Registered GSTIN</label> </p>
<p class= "GSTIN"><label for="GSTIN">GSTIN No.</label></p><br>
<input id = "GSTINNO" maxlength="15" name= "GSTIN" placeholder="GSTIN No." type ="text"><br><br>
<input class="buttom" name="submit" id="submit" tabindex="5" value="Sign me up!" type="submit">
SaveInfo.java
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try{
ResultSet rs = null;
Connection con = null;
PreparedStatement pmst1= null;
String Orgname = request.getParameter("Orgname");
String check =request.getParameter("check");
String GSTINNO = request.getParameter("GSTINNO");
con = DBConnectivity.getOracleDBConnection();
int clientid = 1000014;
MClient Client = new MClient (Env.getCtx(), clientid, null);
我想要我的servlet类中的所有值并将这些值保存在数据库中，我提到了我的web.xml文件 请帮助我
<servlet>
<description></description>
<display-name>SaveInfo</display-name>
<servlet-name>SaveInfo</servlet-name>
<servlet-class>com.org.register.SaveInfo</servlet-class>
<servlet-mapping>
<servlet-name>SaveInfo</servlet-name>
<url-pattern>/servlet/SaveInfo</url-pattern>
</servlet-mapping>
答案 0 :(得分：1)
在Servlet中，您需要按name属性获取参数，而不是id。
例如，您有以下内容，
<input id="Orgname" name="name" placeholder="Organization name" required="" tabindex="5" type="text">
您已将id设为Orgname，name参数为name。所以在Servlet中你会这样做，
request.getParameter("name");
但你在做，
String Orgname = request.getParameter("Orgname");
其次，两个参数的名称不能相同。对于以下两种情况，您将名称命名为
<input id="Orgname" name="name" placeholder="Organization name" required="" tabindex="5" type="text">
<input id="address" name="name" placeholder="Street,Area,city" required="" tabindex="6" type="text"> <br>
为参数指定一些不同的名称。
答案 1 :(得分：0)
JSP post参数使用其属性名称。你在3个参数中写了错误的属性名称。
变化：
<input id="check" name="check"
<input id="Orgname" name="Orgname"
<input id="address" name="address"
要：
library("boot")
# This example is taken from Exercise 7.5 of Gill, Murray and Wright (1991).
enj <- c(200, 6000, 3000, -200)
fat <- c(800, 6000, 1000, 400)
vitx <- c(50, 3, 150, 100)
vity <- c(10, 10, 75, 100)
vitz <- c(150, 35, 75, 5)
j<-simplex(a = enj, A1 = fat, b1 = 13800, A2 = rbind(vitx, vity, vitz),
b2 = c(600, 300, 550), maxi = TRUE)
xx<-(j["soln"])
print(xx)
答案 2 :(得分：0)
请求对象的getParameter函数使用name属性。所以请用以下内容替换你的jsp。
<form id="contactform" action="servlet/SaveInfo" method="post">
<p class="contact"><label for="email">Email</label></p>
<input id="email" name="email" placeholder="example@domain.com" required="" tabindex="1" type="email">
<p class="contact"><label for="username">User Name</label></p>
<input id="username" name="username" placeholder="username" required="" tabindex="2" type="text">
<p class="contact"><label for="password">Password</label></p>
<input type="password" id="password" name="password" required="" tabindex="3">
<p class="contact"><label for="repassword">Confirm Password</label></p>
<input type="password" id="repassword" name="repassword" required="">
<p class="contact"><label for="phone">Mobile Phone</label></p>
<input id="phone" name="phone" placeholder="phone number" required="" tabindex="4" type="text"> <br>
<p class="contact"><label for="name">Organization Name</label></p>
<input id="Orgname" name="Orgname" placeholder="Organization name" required="" tabindex="5" type="text">
<p class="contact"><label for="Address">Address</label></p>
<input id="address" name="address" placeholder="Street,Area,city" required="" tabindex="6" type="text"> <br>
<!-- <select class="select-style" name="BirthMonth"> -->
<label>State</label><br>
<select class="select-style" name="BirthMonth">
<%
ResultSet rs = null;
Connection con = null;
PreparedStatement pmst1= null;
int countryid = 208;
try{
con = DBConnectivity.getOracleDBConnection();
pmst1 = con.prepareStatement(Sqlquery.getRegion());
pmst1.setInt(1, countryid);
rs=pmst1.executeQuery();
while(rs.next()){
String name = rs.getString("name");
%>
<option value="<%=name %>"><%=name %></option>
<% } %>
<%
}catch(Exception e){
}
%>
</select><br><br>
<p class="contact"> <input id="check" name="name" style="margin-right: 10px" type="checkbox">
<label for="name"> Not Yet Registered GSTIN</label> </p>
<p class= "GSTIN"><label for="GSTIN">GSTIN No.</label></p><br>
<input id = "GSTINNO" maxlength="15" name= "GSTIN" placeholder="GSTIN No." type ="text"><br><br>
<input class="buttom" name="submit" id="submit" tabindex="5" value="Sign me up!" type="submit">