Question

如何将数据发送回JavaScript？例如，我只想使用我的servlet将“Hello World”发送到javascript

的Servlet

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    String environmentName = request.getParameter("startEnvironment");
    String pause = Objects.toString(request.getParameter("pause"));


if(pause == "true") {
   //I want to send a string "helloworld" back to javascript/ajax
}

JavaScript / AJAX

   $(document).on('click','.pauseDocker' ,function(){
    var buttonClicked = $(this);
    var pauseEnvName = $(this).attr('name');
    console.log(pauseEnvName);
    //Run Docker
    $.ajax({
        type: 'post',
        url: 'DockerIntegration',
        data: {startEnvironment: pauseEnvName, pause: true},
        success: function () {
            buttonClicked.prop('disabled',true);
        },
        error: function() {
            alert("error");
        }
    });
});

Answer 1

response.setContentType("text/plain");
response.getWriter().println("hello world");

这是到处都是最简单的Servlet示例......

编辑：稍加修改以显示消息：

success: function (data) {alert(data);

Answer 2

 //Success function in your ajax request
 success: function (data) {
         $('#idOfElementWhereYouWantToPrint').text(data);
     },

并在HTML页面中打印

REGISTER \path\TrimCols.jar;

DEFINE TrimCols com.company.myproject.TrimCols();

A = LOAD '/path/file.txt' USING TextLoader() AS (line:chararray);
B = FOREACH A GENERATE TrimCols(line);
DUMP B;

将数据传递回Javascript的简单示例

2 个答案: