JSON学习（转）

json-lib.jar开发包使用:

依赖包:
commons-beanutils.jar;
commons-httpclient.jar;
commons-lang.jar;
ezmorph.jar;不少人使用时会提示net.sf.ezmorph.xxx找不到,就是缺这个:
morph-1.0.1.jar

相关链接:
http://json-lib.sourceforge.net/
http://ezmorph.sourceforge.net/
http://morph.sourceforge.net/

使用过程中问题:
1,把bean转化为json格式时老提示如下错误:
Exception in thread "main" net.sf.json.JSONException: java.lang.NoSuchMethodException: Property 'name' has no getter method
解决:声明bean为public class xxx,必须是public,我用默认类型(class xxx)都不行

2,Exception in thread "main" java.lang.NoSuchMethodError: org.apache.commons.lang.ArrayUtils.toObject([C)[Ljava/lang/Character;
原因:定义属性如下:private char[] options = new char[] { 'a', 'f' };好像不能处理这种类型的

3, private String func1 = "function(i){ return this.options[i]; }";
和
private JSONFunction func2 = new JSONFunction(new String[] { "i" },
"return this.options[i];");
转换后显示结果差不多:
{"func1":function(i){ return this.options[i];,"func2":function(i){ return this.options[i]; }}

测试类:

importjava.util.ArrayList;
importjava.util.HashMap;
importjava.util.List;
importjava.util.Map;

importnet.sf.json.JSONArray;
importnet.sf.json.JSONObject;

publicclassJson{
publicstaticvoidmain(String[]args){
Jsonj=newJson();
j.bean2json();
}

publicvoidarr2json(){
boolean[]boolArray=newboolean[]{true,false,true};
JSONArrayjsonArray=JSONArray.fromObject(boolArray);
System.out.println(jsonArray);
//prints[true,false,true]
}

publicvoidlist2json(){
Listlist=newArrayList();
list.add("first");
list.add("second");
JSONArrayjsonArray=JSONArray.fromObject(list);
System.out.println(jsonArray);
//prints["first","second"]
}

publicvoidcreateJson(){
JSONArrayjsonArray=JSONArray.fromObject("['json','is','easy']");
System.out.println(jsonArray);
//prints["json","is","easy"]
}

publicvoidmap2json(){
Map
map.put("name","json");
map.put("bool",Boolean.TRUE);
map.put("int",newInteger(1));
map.put("arr",newString[]{"a","b"});
map.put("func","function(i){returnthis.arr[i];}");

JSONObjectjson=JSONObject.fromObject(map);
System.out.println(json);
//prints
//["name":"json","bool":true,"int":1,"arr":["a","b"],"func":function(i){
//returnthis.arr[i];}]
}

publicvoidbean2json(){
JSONObjectjsonObject=JSONObject.fromObject(newMyBean());
System.out.println(jsonObject);
/*
*prints
*{"func1":function(i){returnthis.options[i];
*},"pojoId":1,"name":"json","func2":function(i){return
*this.options[i];}}
*/
}

publicvoidjson2bean(){
Stringjson="{name=\"json2\",func1:true,pojoId:1,func2:function(a){returna;},options:['1','2']}";
JSONObjectjb=JSONObject.fromString(json);
JSONObject.toBean(jb,MyBean.class);
System.out.println();
}
}

操作的bean:

importnet.sf.json.JSONFunction;

publicclassMyBean{
privateStringname="json";
privateintpojoId=1;
//privatechar[]options=newchar[]{'a','f'};
privateStringfunc1="function(i){returnthis.options[i];}";
privateJSONFunctionfunc2=newJSONFunction(newString[]{"i"},
"returnthis.options[i];");

//getters&setters
......
}

题外话: 这个我对json-lib包的初次尝试,希望对大家有所帮助,另外大家有谁用过其它处理json的开发包,提出来,大家探讨一下~!!!!