1.导入需要的jar包，github链接地址：https://github.com/zhangliqingyun/jarlist/tree/master/json
2.工具类
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
/**
* @Project: jygc
* @ClassName: JSONUtil
* @author imprise
* @Description: TODO
*/
public final class JSONUtil {
// 将String转换成JSON
public static String string2json(String key, String value) {
JSONObject object = new JSONObject();
object.put(key, value);
return object.toString();
}
// 将数组转换成JSON
public static String array2json(Object object) {
JSONArray jsonArray = JSONArray.fromObject(object);
return jsonArray.toString();
}
// 将Map转换成JSON
public static String map2json(Object object) {
JSONObject jsonObject = JSONObject.fromObject(object);
return jsonObject.toString();
}
// 将domain对象转换成JSON
public static String bean2json(Object object) {
JSONObject jsonObject = JSONObject.fromObject(object);
return jsonObject.toString();
}
// 将JSON转换成domain对象,其中beanClass为domain对象的Class
public static Object json2Object(String json, Class<?> beanClass) {
return JSONObject.toBean(JSONObject.fromObject(json), beanClass);
}
// 将JSON转换成String
public static String json2String(String json, String key) {
JSONObject jsonObject = JSONObject.fromObject(json);
return jsonObject.get(key).toString();
}
// 将JSON转换成数组,其中valueClass为数组中存放对象的Class
public static Object json2Array(String json, Class<?> valueClass) {
JSONArray jsonArray = JSONArray.fromObject(json);
return JSONArray.toArray(jsonArray, valueClass);
}
// 将JSON转换成Map,其中valueClass为Map中value的Class,keyArray为Map的key
public static Map<?, ?> json2Map(Object[] keyArray, String json, Class<?> valueClass) {
JSONObject jsonObject = JSONObject.fromObject(json);
Map<Object, Class<?>> classMap = new HashMap<Object, Class<?>>();
for (int i = 0; i < keyArray.length; i++) {
classMap.put(keyArray[i], valueClass);
}
return (Map<?, ?>) JSONObject.toBean(jsonObject, Map.class, classMap);
}
//将实体对象转换为JSON Object转换 返回前端
public static void responseOutWithJson(HttpServletResponse response, Object responseObject) {
JSONObject responseJSONObject = JSONObject.fromObject(responseObject);
response.setCharacterEncoding("GBK");
response.setContentType("application/json; charset=GBK");
PrintWriter out = null;
try {
out = response.getWriter();
out.append(responseJSONObject.toString());
} catch (Exception e) {
e.printStackTrace();
} finally {
if (out != null) {
out.close();
}
}
}
}