我无法在servlet页面中获取POST值？ [英] I couldn't get the POST value in servlet page?

问题描述

我无法在servlet页面中获取POST值。我之前的问题与这个问题有关。如何从servlet页面的ajax请求中获取数据？

I couldn't get the POST value in servlet page. my previous question related to this question.How to get the data from ajax request in servlet page?

我的servlet页面中需要dataRequestObject值。

I need dataRequestObject value in my servlet page.

 var dataRequestObject= {}; 
                dataRequestObject= {mark:Mark,subject:English,language:C language,author:john};

var dataRequestHeader= {}; 
                dataRequestHeader= {Username:uname,Password:pword,Domain:domain,WindowsUser:windowsuser};


    $.ajax({
            type:'POST',
            url:'http://localhost:8090/SampleServlet1/serv', //calling servlet      
            cache:false,
            headers:dataRequestHeader,
            data:JSON.stringify(dataRequestObject),
            success:function(){ alert("Request Done");},
            error:function(xhr,ajaxOptions){
                alert(xhr.status + " :: " + xhr.statusText);
                } 
            });

提前致谢。

推荐答案

您不应该将其作为JSON字符串发送，而应该作为JS对象发送。更改

You shouldn't send it as JSON string, but just as JS object. Change

data: JSON.stringify(dataRequestObject),

by

data: dataRequestObject,

并按照通常的方式通过JS对象中的键访问servlet中的值

and access the values in the servlet the usual way by the keys as present in JS object

String mark = request.getParameter("mark");
String subject = request.getParameter("subject");
String language = request.getParameter("language");
String author = request.getParameter("author");
// ...

---

注意您的servlet需要在同一个域中运行，否则您将点击同源策略。如果它实际上在同一个域上运行，那么我不会在JS代码中对域进行硬编码，因为它会使您的代码完全不可移植。所以替换

---

Note that your servlet needs to run in the same domain, otherwise you hit the Same Origin Policy. If it's actually running on the same domain, then I would not hardcode the domain in the JS code since it makes your code totally unportable. So replace

url: 'http://localhost:8090/SampleServlet1/serv'

by

url: '/SampleServlet1/serv'

或

url: 'serv'

。

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