Java基础学习总结（54）——JSON和Map转换的工具类

在pom.xml文件中引入如下jar

<dependency>

<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>2.6</version>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.8.0</version>
</dependency>
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2.1</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.1</version>
</dependency>
<!--json-lib -->
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.4</version>
<classifier>jdk15</classifier>

</dependency>

下载下面的jar放入仓库相应的位置：D:\java\maven\maven_repo\net\sf\json-lib\json-lib\2.4

具体代码如下：

package com.zhy.robot.util;


import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;


import net.sf.json.JSONArray;
import net.sf.json.JSONObject;


/**
 * @ClassName: JsonMapUtil
 * @Description: TODO(这里用一句话描述这个类的作用)
 * @author Administrator
 * @date 2016年4月27日 上午10:19:11
 * @Copyright © 2016上海通善互联网金融信息服务有限公司
 */
public class JsonMapUtil {

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;
}

public static Map<String, Object> parseJSON2Map(String jsonStr) {
Map<String, Object> map = new HashMap<String, Object>();
// 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;
}

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;
}

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;
}

// test
public static void main(String[] args) {
String url = "http://...";
List<Map<String, Object>> list = getListByUrl(url);
System.out.println(list);
}
}