JSONArray的使用

 

Android客户端与JAVA服务端JSON传值

分类： android 2012-05-24 00:38  1905人阅读  评论(0)  收藏  举报

JSON android

假设你已经了解JSON数据是怎么一回事了。

1、服务端

服务器端使用json-lib 组装JSON数据的，在Servlet类或者相关容器类中，这里是在struts2中的action类中操作的，代码如下：

 

List list =userService.getAllObject(); //这里是从数据库查询出相关数据，封装成对象，放入list中的
JSONArray ja =JSONArray.fromObject(list); //组装成JSON数据

System.out.println("  ja -->"+ja.toString());
/*打印出来的数据如下所示
[
{"createDate":"2012-05-24 00:04:10.0","createMan":"system","inteUpdateDate":"",
"integralId":-1,"isUpdateInteApp":0,"isUpdateRecApp":0,"lb":0,"needGames":15,
"phoneIMEI":"1234556","phoneSystem":"","phoneType":"","recUpdateDate":"",
"recomAppId":-1,"screenHeight":0,"screenWidth":0,"type":0,"userId":10100},
{"createDate":"2012-05-24 00:04:56.0","createMan":"system","inteUpdateDate":"",
"integralId":-1,"isUpdateInteApp":0,"isUpdateRecApp":0,"lb":0,"needGames":15,
"phoneIMEI":"1234557","phoneSystem":"","phoneType":"","recUpdateDate":"",
"recomAppId":-1,"screenHeight":0,"screenWidth":0,"type":0,"userId":10101}
]
*/
HttpServletResponse response =ServletActionContext.getResponse();
PrintWriter out = response.getWriter();
out.write(ja.toString());//返回字符串格式的JSON数据
out.flush();
out.close();

 

2、客户端

假设服务端提供的接口地址为：http://192.168.1.102:8088/AndroidService/service/getUsers.action

客户端访问服务端及解析服务端返回JSON数据主要代码如下：

 

private void getLocation() {

        StringBuilder builder = new StringBuilder();
        HttpClient client = new DefaultHttpClient();
        HttpGet get = new HttpGet("http://192.168.1.102:8088/AndroidService/service/getUsers.action");
        try {
            HttpResponse response = client.execute(get); //这里使用的是Get方式访问服务端接口，当然也可以使用Post方式
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    response.getEntity().getContent()));
            for (String s = reader.readLine(); s != null; s = reader.readLine()) {
                 builder.append(s);
            }


            JSONArray array = new JSONArray(new String(builder.toString()));
            for (int i = 0; i < array.length(); i++) {
                JSONObject item = array.getJSONObject(i);
                String userId = item.getString("userId");
                String phoneIMEI = item.getString("phoneIMEI");
                String createMan = item.getString("createMan");
                String createDate = item.getString("createDate");
                //这里txtInfo是一个TextView控件
                txtInfo.append("userId:"+userId+" phoneIMEI:"+phoneIMEI
                 +" createMan:"+createMan+" createDate:"+createDate);
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }