import java.util.List; import java.util.Map; import org.json.JSONArray; import org.json.JSONObject; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import java.util.ArrayList; import java.util.HashMap; import com.sbm.wll.dao.UserDao; import com.sbm.wll.entity.User;
@Controller public class Json { @Autowired private UserDao userServiceImpl;
/**
- json格式字符串转json
- @return */ @RequestMapping(value = "/json1") @ResponseBody public String getJson1() { String str = "{"a":"b", "c":"d"}"; JSONObject obj = new JSONObject(str);//org.json System.out.println("json字符串转json:" + obj); return str; }
/**
- List<User>转JSON Springboot自动转化 返回值类型为List
- 注释掉的为使用net.sf.json工具做的 ，是正确的
- @return */ @RequestMapping(value = "/json2") @ResponseBody public List<User> getJson2() { List<User> users = null; users = userServiceImpl.findAll(); // net.sf.json.JSONArray array = new // net.sf.json.JSONArray().fromObject(users); // System.out.println("-----使用.net.sf.json："+array); return users; }
/**
- List<User>转JSON 返回值类型为String
- @return */ @RequestMapping(value = "/json3") @ResponseBody public String getJson3() { List<User> users = null; users = userServiceImpl.findAll(); JSONArray array = new JSONArray(); // org.json包 for (int i = 0; i < users.size(); i++) { User u = users.get(i); JSONObject object = new JSONObject(u); // System.out.println("object:" + object); array.put(object); } System.out.println("org.json.Array:to json:" + array); return array.toString(); }
/**
- Map<String,String>转JSON 返回值类型为String 使用.net.sf.json
- @return */ @RequestMapping(value = "/json4") @ResponseBody public String getJson4() { Map<String, String> map = new HashMap<>(); map.put("1", "c100"); map.put("2", "c233"); map.put("4", "c556"); net.sf.json.JSONArray array = new net.sf.json.JSONArray().fromObject(map); System.out.println("-----使用.net.sf.json：" + array); return array.toString(); }
/**
- 解析json字符串 json中 包含json数组
- @param request
- @return */ @RequestMapping("/jx1") @ResponseBody public String jxJSON1() { String jsonString = "{'id':'1','corpcode':'10147','msg':{'time':'16-35','pp':'ddd'}}"; JSONObject obj = new JSONObject(jsonString); //org.json System.out.println("corpcode:" + obj.getString("corpcode")); JSONObject msg = new JSONObject(obj.get("msg").toString());// msg不是String,要么get,要么getJSONObj System.out.println("msg:" + msg); // 获取msg 里面的json内容 String time = msg.getString("time"); System.out.println("msg---time:" + time); System.out.println("全部json：" + obj); return obj.toString(); }
/**
- 把JSON数组里面的对象，解析到实体中
- @return */ @RequestMapping("/jx2") @ResponseBody public String jsJSON2() { String jString = "[{'id':'111','name':'小明'},{'id':'22','name':'小花'},{'id':'402','name':'小红'}]"; com.alibaba.fastjson.JSONArray array = new com.alibaba.fastjson.JSONArray().parseArray(jString); List<User> users = new ArrayList<>(); for (int i = 0; i < array.size(); i++) { User user = new User(); com.alibaba.fastjson.JSONObject object = array.getJSONObject(i); user.setId(object.getString("id")); user.setName(object.getString("name")); System.out.println("U:" + user.toString()); users.add(user); } for (User u : users) { System.out.println("----" + u.toString()); } return ""; }
}
