ajax 接收json数据的进一步了解

 var url = "../searchclasses";

            $.ajax({

                url: url,

                type: "post",

                dataType: "json",//以json形式接收

                error: function() {

                    alert("error");

                },

                success: function(data) {

                    var html = "";

                    $.each(data, function(index, content) {

                        var kch = content.KCH,

                            kcm = content.KCM,

                            ks = content.KS,

                            kcdm = content.KCDM;

                        html = kch + " " + kcm + " " + ks + " "

                        kcdm;

                        $("#main .main-serarch-box").append(html);

                    });

                }

            });

加个error:function(){

alert("error");

}

来判断是否成功接收到了json数据

后台组装json

    out.print("[");

                for (int i = 1; i <= totalRecord && boo; i++) {

                    int kch = rowSet.getInt(1);

                    String kcm = rowSet.getString(2);

                    Float ks = rowSet.getFloat(3);

                    String kcdm = rowSet.getString(4);

                    if (i != totalRecord) {

                        out.println("{ \"KCH\" : \"" + kch

                                + "\" , \"KCM\" : \"" + kcm + "\",\"KS\" : \""

                                + ks + "\" , \"KCDM\" : \"" + kcdm + "\"},");

                    } else {

                        out.println("{ \"KCH\" : \"" + kch

                                + "\" , \"KCM\" : \"" + kcm + "\",\"KS\" : \""

                                + ks + "\" , \"KCDM\" : \"" + kcdm + "\"}");

                    }

                    // 这里出现了小问题，i的最后一个判断之前没搞清

                    boo = rowSet.next();

                }

                out.print("]");

复制开发者工具栏的json数据到http://www.bejson.com/

json工具检验网站检验下，检查从前台收到的data是否真的是json数据，

json的数组格式为 [{},{},{}]

之前因为少了一个[] 导致error回调函数接收到的为error；

接收成功就是根据json对象来调用json数据

   $.each(data, function(index, content) {

                        var kch = content.KCH,

                            kcm = content.KCM,

                            ks = content.KS,

                            kcdm = content.KCDM;

                        html = kch + " " + kcm + " " + ks + " "

                        kcdm;

                        $("#main .main-serarch-box").append(html);

                    });

然后拼装数据就就可以了。