Java tutorial
/** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.alibaba.jstorm.utils; import java.io.Serializable; import java.util.Date; import java.util.HashMap; import java.util.Map; import org.apache.commons.lang.builder.ToStringBuilder; import org.apache.commons.lang.builder.ToStringStyle; import org.json.simple.JSONAware; //import com.alibaba.fastjson.JSONAware; public class FileAttribute implements Serializable, JSONAware { /** */ private static final long serialVersionUID = -5131640995402822835L; private String fileName; private String isDir; private String modifyTime; private String size; public static final String FILE_NAME_FIELD = "fileName"; public static final String IS_DIR_FIELD = "isDir"; public static final String MODIFY_TIME_FIELD = "modifyTime"; public static final String SIZE_FIELD = "size"; public String getFileName() { return fileName; } public void setFileName(String fileName) { this.fileName = fileName; } public String getIsDir() { return isDir; } public void setIsDir(String isDir) { this.isDir = isDir; } public String getModifyTime() { return modifyTime; } public void setModifyTime(String modifyTime) { this.modifyTime = modifyTime; } public String getSize() { return size; } public void setSize(String size) { this.size = size; } @Override public String toString() { return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE); } @Override public String toJSONString() { Map<String, String> map = new HashMap<String, String>(); map.put(FILE_NAME_FIELD, fileName); map.put(IS_DIR_FIELD, isDir); map.put(MODIFY_TIME_FIELD, modifyTime); map.put(SIZE_FIELD, size); return JStormUtils.to_json(map); } public static FileAttribute fromJSONObject(Map jobj) { if (jobj == null) { return null; } FileAttribute attribute = new FileAttribute(); attribute.setFileName((String) jobj.get(FILE_NAME_FIELD)); attribute.setIsDir((String) jobj.get(IS_DIR_FIELD)); attribute.setModifyTime((String) jobj.get(MODIFY_TIME_FIELD)); attribute.setSize((String) jobj.get(SIZE_FIELD)); return attribute; } public static void main(String[] args) { Map<String, FileAttribute> map = new HashMap<String, FileAttribute>(); FileAttribute attribute = new FileAttribute(); attribute.setFileName("test"); attribute.setIsDir("true"); attribute.setModifyTime(new Date().toString()); attribute.setSize("4096"); map.put("test", attribute); System.out.println("Before:" + map); String jsonString = JStormUtils.to_json(map); Map<String, Map> map2 = (Map<String, Map>) JStormUtils.from_json(jsonString); Map jObject = map2.get("test"); FileAttribute attribute2 = FileAttribute.fromJSONObject(jObject); System.out.println("attribute2:" + attribute2); } }