我的Android进阶之旅------>android如何将List<NameValuePair>请求参数列表转换为json格式

来源：互联网发布：oracle数据库好学吗编辑：程序博客网时间：2024/05/05 10:40

本文同步发表在简书，链接：http://www.jianshu.com/p/395a4c8b05b9

前言

由于接收原来的老项目并进行维护，之前的http请求是使用Apache Jakarta Common下的子项目HttpClient，因此使用了 List<NameValuePair> 方式来创建参数队列，然后通过一个字符串处理的工具类，生成的post请求体格式大致如：

a=b&c=d&e=f

但是由于服务器api变更，需要将请求体的格式变成json格式，因此上面的请求参数要变成：

{"a":"b","c":"d","e":"f"}

但是如果将List<NameValuePair>直接通过Jackson或者Gson等第三方工具的转json的开源类库去转换为json格式的话，转出来的json格式如：

[{"name":"a","value":"b"},{"name":"c","value":"d"},{"name":"e","value":"f"}]

如下面代码所示：

public class RequestParams {        /**请求地址*/        public String url;        /**请求参数集合*/        public List<NameValuePair> params;    }    /**     * 帐号登录     *     * @param userName 账号名     * @param password 密码     * @param days     记住密码天数：days>0定期超时；days=-2永不失效；     *                 days=-1永久记住密码（30天没有操作则失效）     * @param deviceId 账户在设备上的唯一标识符（机器码或mac地址）     * @param appId    应用id     * @return     */    public static RequestParams loginParams(String userName, String password, int days, String deviceId, int appId) {        RequestParams params = new RequestParams();        params.url = LOGIN_URI;        params.params = new ArrayList<NameValuePair>();        params.params.add(new BasicNameValuePair("userName", userName));        params.params.add(new BasicNameValuePair("password", password));        params.params.add(new BasicNameValuePair("days", String.valueOf(days)));        params.params.add(new BasicNameValuePair("deviceId", deviceId));        params.params.add(new BasicNameValuePair("appId", String.valueOf(appId)));        params = addcommonParams(params, LOGIN_URI, appId);        return params;    }

在请求的时候，将List<NameValuePair> params取出来，然后使用JSONUtil工具类转换成json格式，代码如下所示：

String request=JSONUtil.toJSON(requestParams.params);

其中换成json格式的工具类JSONUtil,该工具类使用了jackjson的第三方json解析库，代码如下所示：

    import android.util.Log;    import com.fasterxml.jackson.annotation.JsonInclude.Include;    import com.fasterxml.jackson.core.JsonGenerationException;    import com.fasterxml.jackson.core.JsonParseException;    import com.fasterxml.jackson.databind.DeserializationFeature;    import com.fasterxml.jackson.databind.JsonMappingException;    import com.fasterxml.jackson.databind.ObjectMapper;    import com.fasterxml.jackson.databind.SerializationFeature;    import org.json.JSONException;    import org.json.JSONObject;    import java.io.IOException;    import java.io.StringWriter;    import java.io.Writer;    /**     * JSON转换工具类     *     * @author  OuyangPeng     * @version [1.0.0.0, 2016-3-23]     */    public class JSONUtil {        private static String TAG = SSOJSONUtil.class.getName();        private static ObjectMapper mapper = new ObjectMapper();        static {            //对于为null的字段不进行序列化            mapper.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);            //对于未知属性不进行反序列化            mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);            //无论对象中的值只有不为null的才进行序列化            mapper.setSerializationInclusion(Include.NON_NULL);        }        /**         * 把对象转化成json字符串         *         * @param obj         * @return         */        public static String toJSON(Object obj) {            if (obj == null) {                return null;            }            Writer write = new StringWriter();            try {                mapper.writeValue(write, obj);            } catch (JsonGenerationException e) {                Log.e(TAG, e.toString() + obj);            } catch (JsonMappingException e) {                Log.e(TAG, e.toString() + obj);            } catch (IOException e) {                Log.e(TAG, e.toString() + obj);            }            return write.toString();        }        /**         * JSON字符串转成对象         *         * @param jsonStr         * @param classType         * @return         */        public static <T> T fromJSON(String jsonStr, Class<T> classType) {            if (isEmptyOrNull(jsonStr)) {                return null;            }            T t = null;            try {                t = mapper.readValue(jsonStr.getBytes("utf-8"), classType);            } catch (JsonParseException e) {                Log.e(TAG, e.toString() + ", jsonStr:" + jsonStr + ", classType:" + classType.getName());            } catch (JsonMappingException e) {                Log.e(TAG, e.toString() + ", jsonStr:" + jsonStr + ", classType:" + classType.getName());            } catch (IOException e) {                Log.e(TAG, e.toString() + ", jsonStr:" + jsonStr + ", classType:" + classType.getName());            }            return t;        }        /**         * JSON字符串转化成集合         *         * @param jsonStr         * @return         */        public static <T> T toCollection(String jsonStr, Class<?> collectionClass, Class<?>... elementClasses) {            if (isEmptyOrNull(jsonStr)) {                return null;            }            T t = null;            try {                t = mapper.readValue(jsonStr.getBytes("utf-8")                        , mapper.getTypeFactory().constructParametricType(collectionClass, elementClasses));            } catch (JsonParseException e) {                e.printStackTrace();                Log.e(TAG, e.toString() + ", jsonStr:" + jsonStr);            } catch (JsonMappingException e) {                e.printStackTrace();                Log.e(TAG, e.toString() + ", jsonStr:" + jsonStr);            } catch (IOException e) {                Log.e(TAG, e.toString() + ", jsonStr:" + jsonStr);            }            return t;        }        public static Object get(String jsonStr, String key) {            Object obj = null;            try {                JSONObject jsonObj = new JSONObject(jsonStr);                obj = jsonObj.get(key);            } catch (JSONException e) {                e.printStackTrace();            }            return obj;        }        /**         * 判断字符串是否为null或者""         */        public static boolean isEmptyOrNull(String content) {            if (content == null || content.equals("")) {                return true;            }            return false;        }    }

使用上面的代码将List<NameValuePair> params请求参数集合转换为json后，（不标准）格式如下所示：

[{"name":"userName","value":"13911002200"},{"name":"password","value":"123456"},{"name":"days","value":"-1"},{"name":"deviceId","value":"02:00:00:00:00:00"},{"name":"appId","value":"11"},{"name":"mac","value":"02:00:00:00:00:00"},{"name":"timestamp","value":"2016-03-26 10:24:35"},{"name":"sign","value":"b2873caa5735d16535ff827ee2701cd1"}]

好吧，这样的格式完全不是标准的json格式，服务器那边需要的（标准）json格式是：

{"deviceId":"02:00:00:00:00:00","password":"123456","days":"-1","sign":"b2873caa5735d16535ff827ee2701cd1","mac":"02:00:00:00:00:00","timestamp":"2016-03-26 10:24:35","appId":"11","userName":"13911002200"}

另外一个请求参数队列转后的json格式如下，（不标准）：

[{"name":"accountId","value":"2384403"},{"name":"password","value":"123456"},{"name":"ticket","value":"{\"accountId\":\"2384403\",\"appId\":\"11\",\"loginName\":\"1302200\",\"userName\":\"U12384403\",\"email\":\"\",\"mobilePhone\":\"1302200\",\"timestamp\":\"2016-03-26\",\"maxAge\":-1,\"ip\":\"\",\"sign\":\"4109c59eff52a924e74be3623ecab27d\",\"deviceId\":\"02:00:00:00:00:00\"}"},{"name":"appId","value":"11"},{"name":"mac","value":"02:00:00:00:00:00"},{"name":"timestamp","value":"2016-03-26 10:26:01"},{"name":"sign","value":"22070f51197c15d256764a2de499ef85"}]

服务器那边需要的另外一个请求参数队列转后的（标准）json格式如下所示：

{"timestamp":"2016-03-26 10:26:01","password":"123456","appId":"11","ticket":"{\"accountId\":\"2384403\",\"appId\":\"11\",\"loginName\":\"1302200\",\"userName\":\"U12384403\",\"email\":\"\",\"mobilePhone\":\"1302200\",\"timestamp\":\"2016-03-26\",\"maxAge\":-1,\"ip\":\"\",\"sign\":\"4109c59eff52a924e74be3623ecab27d\",\"deviceId\":\"02:00:00:00:00:00\"}","sign":"22070f51197c15d256764a2de499ef85","accountId":"2384403","mac":"02:00:00:00:00:00"}

好的，现在来说一说解决方法：

step1:将List<NameValuePair> params进行遍历然后丢在同一个Map集合中去

step2:使用JONUtil对Map集合进行转换成json格式字符串

代码如下所示：

/*** 将请求参数转换为json格式*/Map map=new HashMap();for (int i=0;i<requestParams.params.size();i++){    NameValuePair nameValuePair=requestParams.params.get(i);    map.put(nameValuePair.getName(),nameValuePair.getValue());}String request=SSOJSONUtil.toJSON(requestParams.params);String jsonRequest=SSOJSONUtil.toJSON(map);LogUtil.d(TAG, "发送给服务器的内容为:加密前的data:：" + request);LogUtil.d(TAG, "发送给服务器的内容为:加密前的 json data:：" + jsonRequest);

打印出来的日志如下所示：

发送给服务器的内容为:加密前的data:：[{"name":"userName","value":"13011002200"},{"name":"password","value":"123456"},{"name":"days","value":"-1"},{"name":"deviceId","value":"02:00:00:00:00:00"},{"name":"appId","value":"11"},{"name":"mac","value":"02:00:00:00:00:00"},{"name":"timestamp","value":"2016-03-26 10:24:35"},{"name":"sign","value":"b2873caa5735d16535ff827ee2701cd1"}]

发送给服务器的内容为:加密前的 json data:：{"deviceId":"02:00:00:00:00:00","password":"123456","days":"-1","sign":"b2873caa5735d16535ff827ee2701cd1","mac":"02:00:00:00:00:00","timestamp":"2016-03-26 10:24:35","appId":"11","userName":"13011002200"}

发送给服务器的内容为:加密前的data:：[{"name":"accountId","value":"2384403"},{"name":"password","value":"123456"},{"name":"ticket","value":"{\"accountId\":\"2384403\",\"appId\":\"11\",\"loginName\":\"130***2200\",\"userName\":\"U12384403\",\"email\":\"\",\"mobilePhone\":\"130***2200\",\"timestamp\":\"2016-03-26\",\"maxAge\":-1,\"ip\":\"\",\"sign\":\"4109c59eff52a924e74be3623ecab27d\",\"deviceId\":\"02:00:00:00:00:00\"}"},{"name":"appId","value":"11"},{"name":"mac","value":"02:00:00:00:00:00"},{"name":"timestamp","value":"2016-03-26 10:26:01"},{"name":"sign","value":"22070f51197c15d256764a2de499ef85"}]

发送给服务器的内容为:加密前的 json data:：{"timestamp":"2016-03-26 10:26:01","password":"123456","appId":"11","ticket":"{\"accountId\":\"2384403\",\"appId\":\"11\",\"loginName\":\"130***2200\",\"userName\":\"U12384403\",\"email\":\"\",\"mobilePhone\":\"130***2200\",\"timestamp\":\"2016-03-26\",\"maxAge\":-1,\"ip\":\"\",\"sign\":\"4109c59eff52a924e74be3623ecab27d\",\"deviceId\":\"02:00:00:00:00:00\"}","sign":"22070f51197c15d256764a2de499ef85","accountId":"2384403","mac":"02:00:00:00:00:00"}

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