手擼Java類轉json，java的實體類集合（List）轉json

首先講一下原理，json和String類型的數據，用js或者jquery可以互相轉換，因此java只要生成符合json語法的String就可以了

 

第一種：單個實體類轉json

package domain;

public class Commodity {
    private Integer id;
    private String name;
    private String img_path;
    private String detail;
    private Integer price;
    private Integer inventory;
    private boolean putaway;
    private boolean exist;
    private Integer seles_volume;

    public Commodity() {
    }

    public Commodity(Integer id, String name, String img_path, String detail, Integer price, Integer inventory, boolean putaway, boolean exist, Integer seles_volume) {
        this.id = id;
        this.name = name;
        this.img_path = img_path;
        this.detail = detail;
        this.price = price;
        this.inventory = inventory;
        this.putaway = putaway;
        this.exist = exist;
        this.seles_volume = seles_volume;
    }

    public Commodity getCommodity(){
        return this;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public String getImg_path() {
        return img_path;
    }

    public void setImg_path(String img_path) {
        this.img_path = img_path;
    }

    public String getDetail() {
        return detail;
    }

    public void setDetail(String detail) {
        this.detail = detail;
    }

    public Integer getPrice() {
        return price;
    }

    public void setPrice(Integer price) {
        this.price = price;
    }

    public Integer getInventory() {
        return inventory;
    }

    public void setInventory(Integer inventory) {
        this.inventory = inventory;
    }

    public boolean isPutaway() {
        return putaway;
    }

    public void setPutaway(boolean putaway) {
        this.putaway = putaway;
    }

    public boolean isExist() {
        return exist;
    }

    public void setExist(boolean exist) {
        this.exist = exist;
    }

    public Integer getSeles_volume() {
        return seles_volume;
    }

    public void setSeles_volume(Integer seles_volume) {
        this.seles_volume = seles_volume;
    }

    @Override
    public String toString() {
        return "{" +
                "\"id\":" + id +
                ", \"name\":\"" + name + '\"' +
                ", \"img_path\":\"" + img_path + '\"' +
                ", \"detail\":\"" + detail + '\"' +
                ", \"price\":" + price +
                ", \"inventory\":" + inventory +
                ", \"putaway\":" + putaway +
                ", \"exist\":" + exist +
                ", \"seles_volume\":" + seles_volume +
                "}";
    }
}

注意此處的toString方法，自動生成以後，需要稍作改變，如下圖所示

自動生成代碼

修改以後的代碼

這樣就可以通過調用toString方法獲取單個實體類的json數據

第二種：實體類集合轉json

先寫個實體類的擴展類

package domain;

import java.util.List;

public class CommodityExt {
    public CommodityExt() {
    }

    public CommodityExt(List<Commodity> commoditiys) {
        this.commoditiys = commoditiys;
    }

    private List<Commodity> commoditiys;

    public List<Commodity> getCommoditiys() {
        return commoditiys;
    }

    public void setCommoditiys(List<Commodity> commoditiys) {
        this.commoditiys = commoditiys;
    }

    public String listToString(List<Commodity> commoditiys){
        String list = "[";
        for (int i = 0;i<commoditiys.size();i++){
            list+=commoditiys.get(i);
            if (i< commoditiys.size()-1){
                list+=",";
            }
        }
        list += "]";
        return list;
    }
}

這裏需要注意，for循環前後加的值中括號[]而不是大括號{}，且最後一個對象不要加  逗號  ,

這樣就完成類，然後用jquery方法就可以將字符串轉化爲json

var j = JSON.parse(data);