Java com.alibaba.fastjson包解析三种格式json

Love The Way You Lie 2023-05-29 03:12 15阅读 0赞

**目录**

1、json个体

2、简单json数组

3、复杂json数组，且嵌套json

--------------------

### 1、json个体 ###

> \{"percent":10,"policy":1\}

解析代码：

String abconfig = "{\"percent\":10,\"policy\":1}";
    JSONObject object = new JSONObject().parseObject(abconfig);
    TestStruct res = JSON.toJavaObject(object, TestStruct.class);
    System.out.println(res);

定义结构体：

public class TestStruct {
        private int percent;
        private String policy;
    
        public int getPercent() {
            return percent;
        }
        public void setPercent(int percent) {
            this.percent = percent;
        }
        public String getPolicy() {
            return policy;
        }
        public void setPolicy(String policy) {
            this.policy = policy;
        }
    }

### 2、简单json数组 ###

> \[1,2,3,4,5,6\]

解析代码：

String abconfig = "[1,2,3,4,5,6]";
    JSONArray jsArr = JSONArray.parseArray(abconfig);
    List<Integer> intlist = jsArr.toJavaList(Integer.class);
    System.out.println(intlist);

### 3、复杂json数组，且嵌套json ###

首先转换为JSONArray，每个数组元素是一个JSONObject。这个JSONObject的解析通过结构体的定义实现。

多层\{\}通过多层结构体定义实现。

> \[\{  
>     "percent": 10,  
>     "policy": \{  
>         "rankmethod": \{  
>             "version": "rulebased"  
>         \},  
>         "insize": "500",  
>         "outsize": "100"  
>     \},  
> \}, \{  
>     "percent": 70,  
>     "policy": \{  
>         "rankmethod": \{  
>             "version": "rulebased"  
>         \},  
>         "insize": "500",  
>         "outsize": "100"  
>     \}  
> \}\]

解析代码：

List<Layer54Struct> AbCnfList = new ArrayList<>();
            JSONArray jsonArray = JSONArray.parseArray(AbConf);
            for (int i = 0; i < jsonArray.size(); i++) {
                JSONObject object = jsonArray.getJSONObject(i);
                Layer54Struct abcnfi = JSON.toJavaObject(object, Layer54Struct.class);
                AbCnfList.add(abcnfi);
            }
            return AbCnfList;

定义结构体：

public class Layer54Struct {
        private int percent;
        private Layer54Policy policy;
        private String abtag_id;
        private String abtag_name;
        private String whitelist;
    
        public String getWhitelist() { return whitelist; }
    
        public void setWhitelist(String whitelist) { this.whitelist = whitelist; }
    
        public int getPercent() {
            return percent;
        }
    
        public void setPercent(int percent) {
            this.percent = percent;
        }
    
        public String getAbtag_id() {
            return abtag_id;
        }
    
        public void setAbtag_id(String abtag_id) {
            this.abtag_id = abtag_id;
        }
    
        public String getAbtag_name() {
            return abtag_name;
        }
    
        public void setAbtag_name(String abtag_name) {
            this.abtag_name = abtag_name;
        }
    
        public Layer54Policy getPolicy() {
            return policy;
        }
    
        public void setPolicy(Layer54Policy policy) {
            this.policy = policy;
        }
    }
    
    public class Layer54Policy {
        private String isuse;
        public String getIsuse() {
            return isuse;
        }
        public void setIsuse(String isuse) {
            this.isuse = isuse;
        }
    }