我用doPost方法创建了一个简单的jython servlet文件。我正在尝试发布表单,但在 servlet 中我没有获得发布值。下面是我正在尝试的代码段。
Test.html
---------
<form action='Index.py' method='post'>
<input type="text" name="username" value="ifti" />
<input type="text" name="password" value="ifti1233" />
<input type="submit" name="Submit" value="Submit" />
</form>
Index.py
--------
from javax.servlet.http import HttpServlet
import cgi, cgitb, os, sys, shutil
import urllib2
import org.python.util.PyFilter
cgitb.enable();
class Index(HttpServlet):
def doPost(self,req,res):
res.setContentType("text/html")
form = cgi.FieldStorage()
out = res.getWriter()
keys = form.keys()
keys.sort()
pageContent = "<br />number of keys: "+str(len(keys))
for key in keys:
pageContent += fieldStorage[ key ].value
out.println(pageContent)
cgi.FieldStorage
期望其输入来自进程的标准输入或其环境。这就是 Web 服务器和 CGI 请求处理程序合作为 HTTP 请求提供服务的方式。
但是,Servlet 使用不同的协议将原始 HTTP 请求从 Web 服务器传输到请求处理程序,并且 HTTP 请求不容易从标准输入/环境中读取。这就是您的cgi.FieldStorage()
不会检测到任何帖子字段的原因。相反,处理后的请求在传递给doPost()
的HttpServletRequest
对象中提供。您可以在HttpServletRequest
上调用方法来获取 post 字段和标头,例如
import cgi
from pprint import pformat
from javax.servlet.http import HttpServlet
class Index(HttpServlet):
def doPost(self,req,res):
res.setContentType("text/html")
out = res.getWriter()
out.println('<strong>Headers</strong>')
headers = {}
for n in req.headerNames:
headers[n] = req.getHeader(n)
out.println('<pre>')
out.println(pformat(headers))
out.println('</pre><br />')
out.println('<strong>Form fields</strong>')
# get the POST data fields
form = {}
for field in req.parameterMap:
form[field] = list(req.parameterMap[field])
# # Alternative - if you *really* want a FieldStorage object, construct
# # one from the request body, headers and faked environment variables.
# # N.B. assumes that the request body is one line of POST data only.
# from StringIO import StringIO
# request_body = req.reader.readLine()
# form = cgi.FieldStorage(fp=StringIO(request_body),
# headers=headers,
# environ={'REQUEST_METHOD': 'POST',
# 'CONTENT_LENGTH': len(request_body)})
out.println('<pre>%s</pre><br />' % pformat(form))
使用测试表单,您应该看到类似于以下内容的输出:
Headers
{'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
'accept-encoding': 'gzip, deflate',
'accept-language': 'en-au,en-us;q=0.7,en;q=0.3',
'connection': 'keep-alive',
'content-length': '45',
'content-type': 'application/x-www-form-urlencoded',
'host': 'localhost:8080',
'referer': 'http://localhost:8080/jython-servlets/test.html',
'user-agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0'}
Form fields
{'password': ['ifti1233'], 'Submit': ['Submit'], 'username': ['ifti']}