java开发jsonlib的使用例子

最新推荐文章于 2022-03-21 23:14:26 发布

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本文介绍了一种使用Java语言遍历和解析JSON数据的方法。通过具体的代码示例，展示了如何将JSON字符串转换为Java对象，并逐一访问其中的字段。适用于需要处理复杂JSON数据结构的开发者。

<%@ page contentType="text/html; charset=gb2312" language="java"%>
<%@ page import="net.sf.json.JSONArray"%>

<%@ page import="net.sf.json.JSONObject"%>

//json的数组遍历方法

String forms="{"fields":[{"field_id":"1","field_name":"aaa","field_title":"字段一","field_type":"text","field_value":"aaa"},{"field_id":"2","field_name":"bbbb","field_title":"字段二","field_type":"select","field_value":"一一,在在,大枯"},{"field_id":"3","field_name":"ccc","field_title":"字段三","field_type":"radio","field_value":"aa,bb,cc"},{"field_id":"4","field_name":"dddd","field_title":"字段四","field_type":"checkbox","field_value":"济南,北京,上海"},{"field_id":"5","field_name":"eee","field_title":"字段五","field_type":"textarea","field_value":""},{"field_id":"6","field_name":"fff","field_title":"字段六","field_type":"image","field_value":"/images/nopic.gif"},{"field_id":"7","field_name":"ggg","field_title":"字段七","field_type":"datetime","field_value":""},{"field_id":"8","field_name":"hhh","field_title":"字段八","field_type":"editor","field_value":"test在"},]}";

jb = JSONObject.fromObject(forms);
ja = jb.getJSONArray("fields");

if(ja!=null){
for (int i = 0; i < ja.size(); i++) {
sb.append("{");
sb.append("\"field_id\":\""+ja.getJSONObject(i).getString("field_id")+"\",");
sb.append("\"field_name\":\""+ja.getJSONObject(i).getString("field_name")+"\",");
sb.append("\"field_title\":\""+ja.getJSONObject(i).getString("field_title")+"\",");
sb.append("\"field_type\":\""+ja.getJSONObject(i).getString("field_type")+"\",");
sb.append("\"field_value\":\""+ja.getJSONObject(i).getString("field_value")+"\"");
sb.append("}");
sb.append(",");
}
}

另外关于json的遍历代码如下：

import java.text.SimpleDateFormat;  
import java.util.Date;  
import java.util.HashMap;  
import java.util.Iterator;  
import java.util.Map;  
import java.util.Set;  
  
import net.sf.json.JSONObject;  
import net.sf.json.JsonConfig;  
  
  
public class Test3 {  
  
    /** 
     * @param args 
     */  
    public static void main(String[] args) {  
        // TODO Auto-generated method stub  
        String s="【Object json树形字符串】";  
        Map map=new HashMap();  
        JsonConfig jc=new JsonConfig();  
        jc.setClassMap(map);  
        jc.setRootClass(Map.class);  
        jc.setArrayMode(JsonConfig.MODE_LIST);  
        JSONObject jobj=JSONObject.fromObject(s,jc);  
        //递归遍历  
        decodeJSONObject(jobj);  
    }  
    public static void decodeJSONObject(JSONObject json){  
        Iterator<String> keys=json.keys();  
        JSONObject jo=null;  
        Object o;  
        String key;  
        while(keys.hasNext()){  
            key=keys.next();  
            o=json.get(key);  
            if(o instanceof JSONObject){  
                jo=(JSONObject)o;  
                if(jo.keySet().size()>0){  
                    decodeJSONObject(jo);  
                }else{  
                    System.out.println(key);  
                }  
            }else{  
                System.out.println(o);  
            }  
        }  
    }  
}