Question

我有一个web项目，我想做的就是将一个String发送到servlet然后将相同的字符串返回到jsp页面（formList.jsp）并显示它：

发送字符串的javascript代码：

$(document).ready(function(){

    $('#submit').click(function() {
        var value = $('#val').val();
        $.ajax({
            type:'POST',
            data:{value:value},
            url:'FormList',
            success:function(result){
                $('#res').text(result);
            }
        });
    });

});

＆＃39; FORMLIST＆＃39; Servlet doPost：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/plain");
        String value = request.getParameter("value");
        response.getWriter().print(value);

}

web.xml（位于WEB-INF中）：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee                       http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

<servlet>
<servlet-name>FormList</servlet-name>
<servlet-class>FormList</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FormList</servlet-name>
<url-pattern>/FormList</url-pattern>
</servlet-mapping>
</web-app>

但是当我点击提交按钮时，我得到的结果是formList.jsp页面HTML源：（<!DOCTYPE html PUBLIC ....）

*我在servlet中重写服务方法以初始化formList.jsp

我认为doPost根本没有执行任何帮助，请

Answer 1

为FormList servlet提供不同的url映射。

我想在解决formlist.jsp和formlist servlet方面存在困惑。

Answer 2

我强烈建议在有关如何使用servlet执行ajax的问题上查看BalusC的答案here。

我注意到你正在使用jquery，你也可以像这样创建你的ajax请求：

<script>
$(document).on("click", "#submit", function() { 
    var value = $('#val').val(); //get value you want to send
    var params = {value : value}; //set it as one of the parameters

    $.post("FormList", $.param(params), function(response) { //make ajax request
                 $('#res').text(response); //retrieve response and set it to #res
    });
        });
</script>

但无论如何，你之所以只看到html，是因为你没有回复任何回复。你需要这样做：

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

        String value = request.getParameter("value");


   response.setContentType("text/plain");  // Set content type of the response so that jQuery knows what it can expect.
    response.setCharacterEncoding("UTF-8"); // You want world domination, huh?
    response.getWriter().write(value);       // Write response body. (not print)
}

ajax返回HTML源代码而不是String

2 个答案: