使用JSON-LIB转换JAVA对象
使用JSON-LIB可以极大的简化JAVA对象转换成JSON对象所需进行的操作,更可以避免人工操作生成JSON对象字符串时带来的麻烦和误操作：使用JSON-LIB，首先需要有几个支持的包：
http://json-lib.sourceforge.net下载json-lib-1.1-jdk15.jar
commons-lang.jar、commons-logging.jar，commons-beanutils.jar 这些包可在tomcat/comon/lib下找到
EZMorph 下载地址http://ezmorph.sourceforge.net
morph-1.0.1 下载地址:http://morph.sourceforge.net
使用的例子如下所示：
import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import net.sf.json.JSONArray;import net.sf.json.JSONObject;public class JSONTest { public static void main(String[] args) { JSONTest j = new JSONTest(); j.ObjectList2json(); } public void ObjectList2json(){ Map map = new HashMap(); List jlist = new ArrayList(); JSONTestBean bean1 = new JSONTestBean("zhangbo","123123"); JSONTestBean bean2 = new JSONTestBean("lisi","65489"); Props props = new Props("127.0.0.1","8008"); jlist.add(bean1); jlist.add(bean2); map.put("Props", props); map.put("jsonObjectList", jlist); JSONArray jsonArray = JSONArray.fromObject(map); System.out.println(jsonArray); } public void arr2json() { boolean[] boolArray = new boolean[] { true, false, true }; JSONArray jsonArray = JSONArray.fromObject(boolArray); System.out.println(jsonArray); // prints } public void list2json() { List list = new ArrayList(); list.add("first"); list.add("second"); JSONArray jsonArray = JSONArray.fromObject(list); System.out.println(jsonArray); // prints ["first","second"] } public void createJson() { JSONArray jsonArray = JSONArray.fromObject("['json','is','easy']"); System.out.println(jsonArray); // prints ["json","is","easy"] } public void map2json() { Map map = new HashMap(); map.put("name", "json"); map.put("bool", Boolean.TRUE); map.put("int", new Integer(1)); map.put("arr", new String[] { "a", "b" }); map.put("func", "function(i){ return this.arr; }"); JSONObject json = JSONObject.fromObject(map); System.out.println(json); // prints // ["name":"json","bool":true,"int":1,"arr":["a","b"],"func":function(i){ // return this.arr; }] } public void bean2json() { JSONObject jsonObject = JSONObject.fromObject(new JSONTestBean("zhangbo","234234")); System.out.println(jsonObject); /* * prints * {"func1":function(i){ return this.options; * },"pojoId":1,"name":"json","func2":function(i){ return * this.options; }} */ } public void json2bean() { String json = "{name=\"json2\",func1:true,pojoId:1,func2:function(a){ return a; },options:['1','2']}"; // JSONObject jb = JSONObject.fromString(json); // JSONObject.toBean(jb, MyBean.class); System.out.println(); } }
其它两个测试实体Bean:
public class JSONTestBean { private String userName; private String password; public JSONTestBean() { } public JSONTestBean(String username, String password) { this.userName = username; this.password = password; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; }}
public class Props { private String ip; private String port; public Props() { } public Props(String ip, String port) { this.ip = ip; this.port = port; } public String getIp() { return ip; } public void setIp(String ip) { this.ip = ip; } public String getPort() { return port; } public void setPort(String port) { this.port = port; }}
使用起来很方便，有了JSON-LIB的支持，可以使开发者轻松构建起基于JSON的AJAX应用程序。附加:关于使用JSON-LIB转换带有DATE类型的对象需要额外的一些设置。
JsonConfig cfg=new JsonConfig();cfg.registerJsonValueProcessor(java.util.Date.class, new JsonValueProcessorImpl());cfg.registerJsonValueProcessor(java.sql.Date.class, new JsonValueProcessorImpl());JSONObject obj = JSONObject.fromObject(info,cfg);JsonValueProcessorImpl为实现了源代码中的接口JsonValueProcessorimport java.text.SimpleDateFormat;import java.util.Date;import net.sf.json.JsonConfig;import net.sf.json.processors.JsonValueProcessor;public class JsonValueProcessorImpl implements JsonValueProcessor{ private String format="yyyy-MM-dd"; public JsonValueProcessorImpl(){ } public JsonValueProcessorImpl(String format){this.format=format; } public Object processArrayValue(Object value, JsonConfig jsonConfig) {String[] obj={};if(value instanceof Date[]){ SimpleDateFormat sf=new SimpleDateFormat(format); Date[] dates=(Date[])value; obj =new String; for (int i = 0; i < dates.length; i++) { obj=sf.format(dates); }}return obj; } public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) {if(value instanceof Date){ String str=new SimpleDateFormat(format).format((Date)value); return str;}return value.toString(); } public String getFormat() {return format; } public void setFormat(String format) {this.format = format; } }
本文也只是实现了将DATE类型转换成yyyy-MM-dd的格式，各位可以自己测试一下。
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