java 字符串转json,json转实体对象、json字符串转换成List、List转String、以及List排序等等...

@RequestMapping(value = "updateInvestorApplyAccountNo", method = RequestMethod.POST)
@ResponseBody
public void updateInvestorApplyAccountNo(HttpServletRequest request,
HttpServletResponse response,
@RequestBody String requestBody) {
int num = 0;
String result = "";
//下面是把拿到的json字符串转成 json对象
JSONObject jsStr = JSONObject.parseObject(requestBody); //将字符串{“id”：1}
//int jsID = Integer.parseInt(jsStr.getString("id"));//获取id的值


/** 
* json对象转换成java对象  
*/ 
InvestorApplyModel stud = (InvestorApplyModel) JSONObject.toJavaObject(jsStr,InvestorApplyModel.class);

/** 
* json 字符串转换成java对象  
*/

gascontent  model=new gascontent();

model = JSON.parseObject(JSON.parse(json.getString("content")).toString(),gascontent.class);

/** 
* json字符串转换成List
*/

String data=json.getJSONObject("content").getString("data");
 
List<Data>  listdata=JSONObject.parseArray(data, Data.class);

/** 
* List转换成String
*/

String json2=JSON.toJSONString(listdata);

} 

  List 实体类对象排序，首先实体类要实现 Comparable  ，然后在实体类里面重写 compareTo 方法，此方法里面写你要设置的排序属性。

public class Data implements Comparable<Data>{

    private String area;
    private String fwlsmc;
    private String address;
    private String areaname;
    private int distance;
    private String exhaust;
    private String discount;
    private String lon;
    private String brandname;
    private String type;
    private Price price;
    private String name;
    private String id;
    private String position;
    private String lat;
    public void setArea(String area) {
         this.area = area;
     }
     public String getArea() {
         return area;
     }

    public void setFwlsmc(String fwlsmc) {
         this.fwlsmc = fwlsmc;
     }
     public String getFwlsmc() {
         return fwlsmc;
     }

    public void setAddress(String address) {
         this.address = address;
     }
     public String getAddress() {
         return address;
     }

    public void setAreaname(String areaname) {
         this.areaname = areaname;
     }
     public String getAreaname() {
         return areaname;
     }

    public void setDistance(int distance) {
         this.distance = distance;
     }
     public int getDistance() {
         return distance;
     }

    public void setExhaust(String exhaust) {
         this.exhaust = exhaust;
     }
     public String getExhaust() {
         return exhaust;
     }

    public void setDiscount(String discount) {
         this.discount = discount;
     }
     public String getDiscount() {
         return discount;
     }

    public void setLon(String lon) {
         this.lon = lon;
     }
     public String getLon() {
         return lon;
     }

    public void setBrandname(String brandname) {
         this.brandname = brandname;
     }
     public String getBrandname() {
         return brandname;
     }

    public void setType(String type) {
         this.type = type;
     }
     public String getType() {
         return type;
     }

    public void setPrice(Price price) {
         this.price = price;
     }
     public Price getPrice() {
         return price;
     }

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

    public void setId(String id) {
         this.id = id;
     }
     public String getId() {
         return id;
     }

    public void setPosition(String position) {
         this.position = position;
     }
     public String getPosition() {
         return position;
     }

    public void setLat(String lat) {
         this.lat = lat;
     }
     public String getLat() {
         return lat;
     }

 

    // 重写 比较方法 本次例子定义为按距离比较
    @Override
    public int compareTo(Data stu) {
        if (this.distance > stu.getDistance()) {
            return 1;
        } else {
            return -1;
        }
    }



}

  排序调用示例：  

   List<Data> listdata=new ArrayList<>();

   Collections.sort(listdata); //只有一个参数参数为List