Question

基本上我有一个HTML文件，我在其中创建一个JSON对象：

action

我的Java servlet有tableObj的表单，当我提交表单时，上面的JavaScript代码会被执行。如何检索和解析servlet中的JSON对象？ JSON对象为public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException { Object json = request.getParameter("tableObj"); System.out.println(json);。

编辑：我编辑了我的CreateJson函数：

在我的servlet中我有：

<!DOCTYPE html>
<html>
<head>
<title>Facebook Login JavaScript Example</title>
<meta charset="UTF-8">
</head>
<body>
<script>
  // This is called with the results from from FB.getLoginStatus().
  function statusChangeCallback(response) {
    console.log('statusChangeCallback');
    console.log(response);
    // The response object is returned with a status field that lets the
    // app know the current login status of the person.
    // Full docs on the response object can be found in the documentation
    // for FB.getLoginStatus().
    if (response.status === 'connected') {
      // Logged into your app and Facebook.
      testAPI();
    } else if (response.status === 'not_authorized') {
      // The person is logged into Facebook, but not your app.
      document.getElementById('status').innerHTML = 'Please log ' +
        'into this app.';
    } else {
      // The person is not logged into Facebook, so we're not sure if
      // they are logged into this app or not.
      document.getElementById('status').innerHTML = 'Please log ' +
        'into Facebook.';
    }
  }

  // This function is called when someone finishes with the Login
  // Button.  See the onlogin handler attached to it in the sample
  // code below.
  function checkLoginState() {
    FB.getLoginStatus(function(response) {
      statusChangeCallback(response);
    });
  }

  window.fbAsyncInit = function() {
  FB.init({
    appId      : '1467517133547158',
    cookie     : true,  // enable cookies to allow the server to access 
                        // the session
    xfbml      : true,  // parse social plugins on this page
    version    : 'v2.2' // use version 2.2
  });

  // Now that we've initialized the JavaScript SDK, we call 
  // FB.getLoginStatus().  This function gets the state of the
  // person visiting this page and can return one of three states to
  // the callback you provide.  They can be:
  //
  // 1. Logged into your app ('connected')
  // 2. Logged into Facebook, but not your app ('not_authorized')
  // 3. Not logged into Facebook and can't tell if they are logged into
  //    your app or not.
  //
  // These three cases are handled in the callback function.

  FB.getLoginStatus(function(response) {
    statusChangeCallback(response);
  });

  };

  // Load the SDK asynchronously
  (function(d, s, id) {
    var js, fjs = d.getElementsByTagName(s)[0];
    if (d.getElementById(id)) return;
    js = d.createElement(s); js.id = id;
    js.src = "//connect.facebook.net/en_US/sdk.js";
    fjs.parentNode.insertBefore(js, fjs);
  }(document, 'script', 'facebook-jssdk'));

  // Here we run a very simple test of the Graph API after login is
  // successful.  See statusChangeCallback() for when this call is made.
  function testAPI() {
    console.log('Welcome!  Fetching your information.... ');
    FB.api('/me', function(response) {
      console.log('Successful login for: ' + response.name);
      document.getElementById('status').innerHTML =
        'Thanks for logging in, ' + response.name + '!';
      document.getElementById('logout-button').innerHTML =
          '<span id="fbLogout" onclick="fbLogout()"><a href="#"><span class="fb_button_text">Logout</span></a></span>';
    });
  }
</script>

<!--
  Below we include the Login Button social plugin. This button uses
  the JavaScript SDK to present a graphical Login button that triggers
  the FB.login() function when clicked.
-->

<fb:login-button scope="public_profile,email" onlogin="checkLoginState();">
</fb:login-button>

<div id="status">
</div>

<div id="logout-button"></div>

<script>
function fbLogout() {
        FB.logout(function (response) {
            //Do what ever you want here when logged out like reloading the page
            window.location.reload();
        });
    }
</script>



</body>
</html>

在日志中，它打印为空。

Answer 1

看到你在java脚本中使用POST

$.ajax({
            type : 'POST',
            dataType : 'json',
            data: { tableObj : JSON.stringify(jsondata)},
            url : 'ServletUrl',
            timeout : 5000,
            success : function(data, textStatus) {
                // whatever
            },
            error : function(xhr, textStatus, errorThrown) {
                // whatever
            }
        });

但您在servlet中没有使用相同的动词（doPost），请更改

public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws IOException {

以

public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {

如何将JSON对象转换为servlet？

1 个答案: