本文同步发表在简书，链接：
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 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 (); 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 fromJSON(String jsonStr, Class 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 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
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"} ====================================================================
作者：欧阳鹏 欢迎转载，与人分享是进步的源泉！
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