正文
java实现字符串和LIST，MAP转换
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需要下载第三方的jar ：net.sf.json
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.commons.collections.map.ListOrderedMap;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
/**
*
* 处理json的工具类.
* <br>本类为处理json的工具类
* @author slj
*/
public class JsonTools {
/**
*
* json转换list.
* <br>详细说明
* @param jsonStr json字符串
* @return
* @return List<Map<String,Object>> list
* @throws
* @author slj
* @date 2013年12月24日 下午1:08:03
*/
public static List<Map<String, Object>> parseJSON2List(String jsonStr){
JSONArray jsonArr = JSONArray.fromObject(jsonStr);
List<Map<String, Object>> list = new ArrayList<Map<String,Object>>();
Iterator<JSONObject> it = jsonArr.iterator();
while(it.hasNext()){
JSONObject json2 = it.next();
list.add(parseJSON2Map(json2.toString()));
}
return list;
}
/**
*
* json转换map.
* <br>详细说明
* @param jsonStr json字符串
* @return
* @return Map<String,Object> 集合
* @throws
* @author slj
*/
public static Map<String, Object> parseJSON2Map(String jsonStr){
ListOrderedMap map = new ListOrderedMap();
//最外层解析
JSONObject json = JSONObject.fromObject(jsonStr);
for(Object k : json.keySet()){
Object v = json.get(k);
//如果内层还是数组的话，继续解析
if(v instanceof JSONArray){
List<Map<String, Object>> list = new ArrayList<Map<String,Object>>();
Iterator<JSONObject> it = ((JSONArray)v).iterator();
while(it.hasNext()){
JSONObject json2 = it.next();
list.add(parseJSON2Map(json2.toString()));
}
map.put(k.toString(), list);
} else {
map.put(k.toString(), v);
}
}
return map;
}
/**
*
* 通过HTTP获取JSON数据.
* <br>通过HTTP获取JSON数据返回list
* @param url 链接
* @return
* @return List<Map<String,Object>> list
* @throws
* @author slj
*/
public static List<Map<String, Object>> getListByUrl(String url){
try {
//通过HTTP获取JSON数据
InputStream in = new URL(url).openStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder sb = new StringBuilder();
String line;
while((line=reader.readLine())!=null){
sb.append(line);
}
return parseJSON2List(sb.toString());
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
*
* 通过HTTP获取JSON数据.
* <br>通过HTTP获取JSON数据返回map
* @param url 链接
* @return
* @return Map<String,Object> 集合
* @throws
* @author slj
*/
public static Map<String, Object> getMapByUrl(String url){
try {
//通过HTTP获取JSON数据
InputStream in = new URL(url).openStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder sb = new StringBuilder();
String line;
while((line=reader.readLine())!=null){
sb.append(line);
}
return parseJSON2Map(sb.toString());
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
*
* map转换json.
* <br>详细说明
* @param map 集合
* @return
* @return String json字符串
* @throws
* @author slj
*/
public static String mapToJson(Map<String, String> map) {
Set<String> keys = map.keySet();
String key = "";
String value = "";
StringBuffer jsonBuffer = new StringBuffer();
jsonBuffer.append("{");
for (Iterator<String> it = keys.iterator(); it.hasNext();) {
key = (String) it.next();
value = map.get(key);
jsonBuffer.append(key + ":" +"\""+ value+"\"");
if (it.hasNext()) {
jsonBuffer.append(",");
}
}
jsonBuffer.append("}");
return jsonBuffer.toString();
}
//test
public static void main(String[] args) {
String url = "http://...";
List<Map<String,Object>> list = getListByUrl(url);
System.out.println(list);
}
}
比如解析：
{"data":[{"id":"402880566092af74016092ba010f0026_151429025888228961","WI_ACTIVITY_ID_":"manuscripts","WI_ID_":"151429025888228961","workflowName":"志书编纂1","tableId":"8a7a543d5ccf1bb3015ccf412169006d","workflowId":"8a7aef3d5cd871bf015cd876c65b0000","workflowCode":"ZSBZ_NEW","PROCESS_INSTANCE_ID_":"151429025753518344","WI_STATUS_KEY_":"12","explain":"超级管理员申请的2017-12-26 20:09:12志书编纂1"},{"id":"83838a7a5fec0991015fec0b11d70010_151149367104810227","WI_ACTIVITY_ID_":"taskAssigned","WI_ID_":"151149367104810227","workflowName":"专题编研","tableId":"8a8aacd9564a3a1901564a882a6c0022","workflowId":"297ee40a56ca38590156caa6a0bb0008","workflowCode":"ZTBY_ZT","PROCESS_INSTANCE_ID_":"151149367010400495","WI_STATUS_KEY_":"12","explain":"超级管理员申请的2017-11-24 11:21:09专题编研"},{"id":"948181865e08e7b0015e091ea117011b_150339155625410132","WI_ACTIVITY_ID_":"activity2","WI_ID_":"150339155625410132","workflowName":"退回整理库","tableId":"402809815894218c01589560c7f90006","workflowId":"8383849458b8d25a0158b8dc9daa0000","workflowCode":"RETURNARRANGE","PROCESS_INSTANCE_ID_":"150339155603600640","WI_STATUS_KEY_":"12","explain":"超级管理员申请的2017-08-22 16:45:55退回整理库"}],"pageNumber":1,"pageSize":3,"total":3,"totalPages":1}
获取其中的data部分转换为List<Map<String,Object>> public List<Map<String,Object>> parseStringToListMap(String res) throws Exception{
List<Map<String,Object>> list=new ArrayList<Map<String,Object>>();
JSONObject jsonResult = new JSONObject(res);
Iterator<String> nameItr = jsonResult.keys();
while (nameItr.hasNext()) {
String name = nameItr.next();
if(name.equals("data")){
String data=jsonResult.getString(name);
JSONArray jsonArr = JSONArray.fromObject(data);
for(int s=0;s<jsonArr.size();s++){//便利取到每个map
Map<String,Object> map = new HashMap<String,Object>();
String vas= jsonArr.get(s)==null?"":jsonArr.get(s).toString();
JSONObject jr=new JSONObject(vas);
Iterator<String> nir = jr.keys();
while (nir.hasNext()) {//取到map里的每个值
String json2 = nir.next();
String value= jr.getString(json2);
map.put(json2, value);
}
list.add(map);
}
}
}
return list;
}
