[知了堂学习笔记]_Ajax之解析Json

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1.json字符串

var str1 = '{"name":"xxx","sex":"man"}';

2.json对象

var str2 = '{"name":"xxx","sex":"man"}';

3.JavaBean转json

<button id="str02">javaBean</button><p id="info"></p>$("str02").onclick = function() {loadTextData("ajax_xml.do?method=javaBeanToJson", "GET", true, function() {            if(xmlHttpReq.readyState == 4 && xmlHttpReq.status == 200) {                var res = xmlHttpReq.responseText; // 获得是一个JSON字符串                // JSON字符串转JSON对象                var obj = JSON.parse(res);                // 将数据渲染到页面上                $("info").innerText = "id : " + obj.id + " name : " + obj.name + " age : " + obj.age;            }        }, null);    }private void javaBeanToJson(HttpServletRequest request,            HttpServletResponse response) throws IOException {        // TODO Auto-generated method stub        PrintWriter out = response.getWriter();        AjaxBean ajaxBean = new AjaxBean(1001, "zhangsan", 23);        Gson gson = new Gson();        String json = gson.toJson(ajaxBean); // 将JavaBean对象转成Json        out.println(json);        out.flush();        out.close();    }

4.list转json

<button id="str03">List</button>$("str03").onclick = function() {        loadTextData("ajax_xml.do?method=listToJson", "GET", true, function() {            if(xmlHttpReq.readyState == 4 && xmlHttpReq.status == 200) {                var res = xmlHttpReq.responseText; // 获得是一个JSON字符串                // JSON字符串转JSON对象                var obj = JSON.parse(res);                var info = "";                for(i = 0; i < obj.length; i++) {                    info += "id : " + obj[i].id + " name : " + obj[i].name + " age : " + obj[i].age + "\n\n";                }                $("info").innerText = info;            }        }, null);    }private void listToJson(HttpServletRequest request,            HttpServletResponse response) throws IOException {        // TODO Auto-generated method stub        response.setContentType("text/plain; charset=utf-8");        PrintWriter out = response.getWriter();        List<AjaxBean> list = new ArrayList<>();        for(int i = 0; i < 3; i++) {            AjaxBean ajaxBean = new AjaxBean(i, "zhangsan", 23);            list.add(ajaxBean);        }        Gson gson = new Gson();        String json = gson.toJson(list);        out.println(json);        out.flush();        out.close();    }