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:

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 Json {
    public static void main(String[] args) {
        Json j = new Json();
        j.bean2json();
    }

    public void arr2json() {
        boolean[] boolArray = new boolean[] { true, false, true };
        JSONArray jsonArray = JSONArray.fromObject(boolArray);
        System.out.println(jsonArray);
        // prints [true,false,true]
    }

    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.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[i]; }");

        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[i]; }]
    }

    public void bean2json() {
        JSONObject jsonObject = JSONObject.fromObject(new MyBean());
        System.out.println(jsonObject);
        /*
         * prints
         * {"func1":function(i){ return this.options[i];
         * },"pojoId":1,"name":"json","func2":function(i){ return
         * this.options[i]; }}
         */
    }

    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();
    }
}

 

操作的bean:

import net.sf.json.JSONFunction;

public class MyBean {
    private String name = "json";
    private int pojoId = 1;
    // private char[] options = new char[] { 'a', 'f' };
    private String func1 = "function(i){ return this.options[i]; }";
    private JSONFunction func2 = new JSONFunction(new String[] { "i" },
            "return this.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~!!!!