我想使用Web表单来提交一些信息,然后JSP页面将显示输入的表单信息。但是,当我单击表单中的提交按钮时,它将转到正确的JSP文件,但所有表单值都显示为“null”。我使用Jersey来执行POST请求。为什么我会在JSP中获得空值?
形式为:
<form action="/MyRestWS/rest/customer/created" method="POST">
<table border="1">
<tr>
<td>Customer name:</td>
<td><input type="text" name="name"></td>
</tr>
<tr>
<td>Customer ID:</td>
<td><input type="text" name="id"></td>
</tr>
<tr>
<td>Customer DOB:</td>
<td><input type="text" name="dob"></td>
</tr>
</table>
<br/>
<input type="submit" value="Submit">
</form>
做请求的代码是:
@Path("/customer")
public class CustomerService {
@POST
@Consumes(MediaType.APPLICATION_FORM_URLENCODED)
@Path("created")
public Response createCustomer(@FormParam("id") int id, @FormParam("name") String name, @FormParam("dob") Date dob) {
Response r;
r = Response.ok().entity(new Viewable("/confirm.jsp")).build();
return r;
}
@GET
@Produces(MediaType.TEXT_HTML)
public Viewable displayForm() {
return new Viewable("/form.html");
}
}
显示的JSP文件是confirm.jsp
,其内容为:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Your entered information</title>
</head>
<body>
<h2>
<%
out.println("You've entered the following information:");
%>
</h2>
<p>
Customer Name:
<%=request.getParameter("name")%></p>
<p>
Customer ID:
<%=request.getParameter("id")%></p>
<p>
Customer DOB:
<%=request.getParameter("dob")%></p>
</body>
</html>
如果我在浏览器中键入以下地址:
http://localhost:8080/MyRestWS/rest/customer
它会告诉我form.html
的形式。我填写信息,然后单击后“提交”,它会去以下地址,并通过指定的路径显示JSP文件:
http://localhost:8080/MyRestWS/rest/customer/created
的JSP文件显示正确,但所有的客户信息字段显示为“null”如下:
You've entered the following information:
Customer Name: null
Customer ID: null
Customer DOB: null
那么为什么我在提交表单后在JSP中得到空值?我的代码有什么问题?
**无关:** [在JSP中使用scriptlets非常令人沮丧](http://stackoverflow.com/a/3180202/814702) – informatik01
@ informatik01:感谢您的建议。我只是使用JSP来获得快速原型。 – tonga
我明白了。我写了它以防万一)) – informatik01