Java实现的JSONUtil工具类与用法示例

import java.util.HashMap;import java.util.Map;import com.alibaba.druid.util.StringUtils;import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONObject;public class JSONUtils {  /**   * Bean对象转JSON   *   * @param object   * @param dataFormatString   * @return   */  public static String beanToJson(Object object, String dataFormatString) {    if (object != null) {      if (StringUtils.isEmpty(dataFormatString)) {        return JSONObject.toJSONString(object);      }      return JSON.toJSONStringWithDateFormat(object, dataFormatString);    } else {      return null;    }  }  /**   * Bean对象转JSON   *   * @param object   * @return   */  public static String beanToJson(Object object) {    if (object != null) {      return JSON.toJSONString(object);    } else {      return null;    }  }  /**   * String转JSON字符串   *   * @param key   * @param value   * @return   */  public static String stringToJsonByFastjson(String key, String value) {    if (StringUtils.isEmpty(key) || StringUtils.isEmpty(value)) {      return null;    }    Map<String, String> map = new HashMap<String, String>();    map.put(key, value);    return beanToJson(map, null);  }  /**   * 将json字符串转换成对象   *   * @param json   * @param clazz   * @return   */  public static Object jsonToBean(String json, Object clazz) {    if (StringUtils.isEmpty(json) || clazz == null) {      return null;    }    return JSON.parseObject(json, clazz.getClass());  }  /**   * json字符串转map   *   * @param json   * @return   */  @SuppressWarnings("unchecked")  public static Map<String, Object> jsonToMap(String json) {    if (StringUtils.isEmpty(json)) {      return null;    }    return JSON.parseObject(json, Map.class);  }}

public static void main(String[] args) {    String jsonStr = "{'userName':'huangbaokang','password':'123456'}";    Map<String, Object> map = JSONUtils.jsonToMap(jsonStr);    System.out.println(map.get("userName"));}

public class User {  private String userName;  private String password;  public String getUserName() {    return userName;  }  public void setUserName(String userName) {    this.userName = userName;  }  public String getPassword() {    return password;  }  public void setPassword(String password) {    this.password = password;  }}public static void main(String[] args) {    String jsonStr = "{'userName':'huangbaokang','password':'123456'}";    User user = (User) JSONUtils.jsonToBean(jsonStr, new User());    System.out.println("用户名="+user.getUserName()+" 密码="+user.getPassword());}

public static void main(String[] args) {    User user = new User();    user.setUserName("huangbaokang");    user.setPassword("123456");    String result = JSONUtils.beanToJson(user);    System.out.println(result);}