Json lib 教程

jopen 12年前發布 | 86K 次閱讀 JSON JSON開發包

Json_lib可以方便的將Java對象轉成json格式的字符串,也可以將Java對象轉換成xml格式的文檔,同樣可以將Json字符串轉換成Java對象,或者將xml字符串轉換成Java對象。

 

官網:http://json-lib.sourceforge.net/

JSON在線轉換:http://json.parser.online.fr/

JSON教程:http://www.json.org/json-zh.html

官網上說明了json_lib還需要依賴的Jar包有:

JAR

網址

jakarta commons-lang 2.5

http://commons.apache.org/lang/download_lang.cgi

jakarta commons-beanutils 1.8.0

http://commons.apache.org/beanutils/download_beanutils.cgi

jakarta commons-collections 3.2.1

http://commons.apache.org/collections/download_collections.cgi

jakarta commons-logging 1.1.1

http://commons.apache.org/logging/download_logging.cgi

ezmorph 1.0.6

http://ezmorph.sourceforge.net/

注意這里如果jakarta commons-lang 使用3.1版本的會報:Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException

所以這里還是使用2.6的吧

 

MyBean.java

package com.iflytek.json;

import net.sf.json.JSONFunction;

/**
 * @author xudongwang 2012-1-15
 * 
 *         Email:xdwangiflytek@gmail.com
 */
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];");


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getPojoId() {
        return pojoId;
    }

    public void setPojoId(int pojoId) {
        this.pojoId = pojoId;
    }

    public char[] getOptions() {
        return options;
    }

    public void setOptions(char[] options) {
        this.options = options;
    }

    public String getFunc1() {
        return func1;
    }

    public void setFunc1(String func1) {
        this.func1 = func1;
    }

    public JSONFunction getFunc2() {
        return func2;
    }

    public void setFunc2(JSONFunction func2) {
        this.func2 = func2;
    }

} 
JsonlibTest.java
package com.iflytek.json;

import java.lang.reflect.InvocationTargetException;
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;

import org.apache.commons.beanutils.PropertyUtils;

/**
 * @author xudongwang 2012-1-15
 * 
 *         Email:xdwangiflytek@gmail.com
 */
public class JsonlibTest {

    // JSONArray是將一個Java對象轉換成json的Array格式,如['xdwang', 22]
    private JSONArray jsonArray = null;
    // JSONObject是將Java對象轉換成一個json的Object形式,如{name:'xdwang', age: 22}
    private JSONObject jsonObject = null;

    public static void main(String[] args) {
        JsonlibTest json = new JsonlibTest();
        json.ArrayToJSON();
        json.ListToJSON();
        json.MapsToJSON();
        json.BeanToJSON();
        json.JSONToBean();
    }

    /**
     * 數組轉JSON操作
     */
    public void ArrayToJSON() {
        boolean[] boolArray = new boolean[] { true, false, true };
        jsonArray = JSONArray.fromObject(boolArray);
        System.out.println("數組轉JSON操作:" + jsonArray);
    }

    /**
     * 集合轉JSON操作
     */
    public void ListToJSON() {
        List<String> list = new ArrayList<String>();
        list.add("first");
        list.add("second");
        jsonArray = JSONArray.fromObject(list);
        System.out.println("集合轉JSON操作:" + jsonArray);
    }

    /**
     * Maps轉JSON操作
     */
    public void MapsToJSON() {
        Map<String, Object> map = new HashMap<String, Object>();
        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 = JSONObject.fromObject(map);
        System.out.println("Maps轉JSON操作:" + jsonObject);
    }

    /**
     * Bean轉JSON操作
     */
    public void BeanToJSON() {
        jsonObject = JSONObject.fromObject(new MyBean());
        System.out.println("Bean轉JSON操作:" + jsonObject);
    }

    /**
     * JSON轉Bean操作
     */
    public void JSONToBean() {
        try {
            String json = "{\"func1\":function(i){ return this.options[i]; },\"func2\":function(i){ return this.options[i]; },\"name\":\"json\",\"options\":[\"a\",\"f\"],\"pojoId\":1}";
            jsonObject = JSONObject.fromObject(json);
            Object bean = JSONObject.toBean(jsonObject);
            System.out.println("jsonStr:" + json);

            System.out.println("name:" + jsonObject.get("name"));
            System.out.println("name:"
                    + PropertyUtils.getProperty(bean, "name"));
            System.out.println("pojoId:" + jsonObject.get("pojoId"));
            System.out.println("pojoId:"
                    + PropertyUtils.getProperty(bean, "pojoId"));
            System.out.println("options:" + jsonObject.get("options"));
            System.out.println("options:"
                    + PropertyUtils.getProperty(bean, "options"));
            System.out.println("func1:" + jsonObject.get("func1"));
            System.out.println("func1:"
                    + PropertyUtils.getProperty(bean, "func1"));
            System.out.println("func2:" + jsonObject.get("func2"));
            System.out.println("func2:"
                    + PropertyUtils.getProperty(bean, "func2"));
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        }
    }

}
轉自:http://xdwangiflytek.iteye.com/blog/1345380

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