java json字符串操作

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以下导入jar包：

//json-lib-2.2-jdk15.jar

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

1、字符串转成一个json 数组

String strs="[{'valueCode':1,'valueName':'外请统调车'},{'valueCode':2,'valueName':'合同车'},{'valueCode':3,'valueName':'其他'},{'valueCode':1,'valueName':'精准整车'},{'valueCode':2,'valueName':'整车配送'},{'valueCode':3,'valueName':'精准专车'}]"net.sf.json.JSONArray  json = net.sf.json.JSONArray.fromObject(strs); if(json.size()>0){for(int i=0;i<json.size();i++){net.sf.json.JSONObject job = json.getJSONObject(i);  // 遍历 jsonarray 数组，把每一个对象转成 json 对象System.out.println(job.get("valueCode")+"=") ;  // 得到 每个对象中的属性值}}

2、把java 对象列表转换为json对象数组，并转为字符串

JSONArray array = JSONArray.fromObject(userlist);String jsonstr = array.toString();

3、把java对象转换成json对象，并转化为字符串

JSONObject object = JSONObject.fromObject(invite);  Log4jInit.ysulogger.debug(object.toString());

4、把JSON字符串转换为JAVA 对象数组

String personstr = getRequest().getParameter("persons");

JSONArray json = JSONArray.fromObject(personstr);List<InvoidPerson> persons = (List<InvoidPerson>)JSONArray.toCollection(json, nvoidPerson.class);

5、把JSON字符串转换为JAVA 对象

str = "{\"lendperson\":\"李四\",\"lendcompany\":\"有限公司\",\"checkperson\":\"李四\",  \"lenddate\":\"2010-07-19T00:00:00\",\"lendcounts\":4,\"  passports\":[{\"passportid\":\"d\",\"name\":\"李豫川\",\"passporttype\":\"K\"},  {\"passportid\":\"K9051\",\"name\":\"李平\",\"passporttype\":\"K\"},  {\"passportid\":\"K90517\",\"name\":\"袁寒梅\",\"passporttype\":\"K\"},  {\"passportid\":\"K905199\",\"name\":\"贺明\",\"passporttype\":\"K\"}]}";   JSONObject jsonobject = JSONObject.fromObject(str);  PassportLendsEntity passportlends = null;  try {   //获取一个json数组   JSONArray array = jsonobject.getJSONArray("passports");   //将json数组 转换成 List<PassPortForLendsEntity>泛型   List<PassPortForLendsEntity> list = new ArrayList<PassPortForLendsEntity>();   for (int i = 0; i < array.size(); i++) {               JSONObject object = (JSONObject)array.get(i);              PassPortForLendsEntity passport = (PassPortForLendsEntity)JSONObject.toBean(object,              PassPortForLendsEntity.class);            if(passport != null){             list.add(passport);            }           }   //转换PassportLendsEntity 实体类   passportlends = (PassportLendsEntity)JSONObject.toBean(jsonobject, PassportLendsEntity.class);

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