无法将 json 对象发送到 servlet

Question

我在这里通过 AJAX 从 JSP.In servlet 调用调用 servlet，从数据库中获取数据并将这些数据转换为 JSON 使用我想要的 Gson.After 格式将此 json 对象发送到此 JSP.But 此处我无法发送 json object.Please 建议我？ AJAX 调用的代码：

<script type="text/javascript">
        $(document).ready(function() {
            $('#subbtn').click(function(event) {     
                console.log("Hello");
                var searchfield = $('#searchfields').val();
                var operator = $('#operator').val();
                var fieldvalue = $('#searchstring').val();
                var filter=searchfield+operator+"'"+fieldvalue+"'";
                console.log(filter);
                $.get('SearchData', {
                    filter : filter

                }, function(responseText) {
                    $('#example').html(responseText);

                    console.log('dddd');
                });
            });

        });
    </script>

这是 servlet 代码：

String query = "select * from searchsample";
        statement = connection.createStatement();
        resultSet = statement.executeQuery(query);
        while (resultSet.next()) {

            renderingengine = resultSet.getString("RenderingEngine");
            browser = resultSet.getString("Browser");
            platform = resultSet.getString("platform");
            engineversion = resultSet.getString("EngineVersion");
            cssgrade = resultSet.getString("CSSGrade");
        }

         Gson gson = new Gson();

       JsonVo jsondata=new JsonVo();
       jsondata.setRenderingengine(renderingengine);
       jsondata.setBrowser(browser);
       jsondata.setPlatform(platform);
       jsondata.setEngineversion(engineversion);
       jsondata.setCssgrade(cssgrade);
       String toJson = gson.toJson(jsondata);
        System.out.println("Json Format : " +toJson);

        request.setCharacterEncoding("utf8");
        response.setContentType("application/json");

Answer 1

我想你只需要写下一行就可以将 JSON 从 servlet 发送到 JSP。

response.setContentType("application/json");
response.getWriter().write(toJson);

无法将 json 对象发送到 servlet

Not able to send json object to servlet

json

servlets

gson