java获取json格式中的值详解编程语言

import org.json.JSONArray; 
import org.json.JSONException; 
  
public class test2 { 
    public static void main(String[] args) throws JSONException { 
        String str = "[{'columnId':5,'columnName':'人文历史'},{'columnId':2,'columnName':'商业视野'}]}"; 
        JSONArray jsonArray = null; 
        jsonArray = new JSONArray(str); 
        System.out.println(jsonArray.getJSONObject(0).get("columnName")); 
    } 
} 

/** 
  * 项目变更详情 
  * @param request 
  * @param response 
  * @throws Exception 
  */ 
  @RequestMapping("detail") 
  @Action(description="编辑项目变更表") 
  public ModelAndView detail(HttpServletRequest request) throws Exception{ 
	Long recordId=RequestUtil.getLong(request,"recordId",0L); 
	FundRecords fundRecord = fundRecordsService.getById(recordId); 
	FundModify fundModify = fundModifyService.getByRecordId(recordId); 
	String fileName = fundModify.getModifyFile();//failName = [{"id":"10000058240001","name":"附件.xls"}] 
	net.sf.json.JSONArray jsonArray = net.sf.json.JSONArray.fromObject(fileName); 
	String fileNames = ""; 
	for (int i = 0; i < jsonArray.size(); i++) { 
	　　fileNames += jsonArray.getJSONObject(i).get("name")+","; 
	} 
	fileNames = fileNames.substring(0, fileNames.lastIndexOf(",")); 
	return getAutoView().addObject("recordId", recordId).addObject("fundRecords", fundRecord) 
	.addObject("fundModify", fundModify).addObject("fileNames", fileNames); 
}