json string array to json array

When you need to convert a string of strings into a json array and traverse the contents.
First, import the two jar packages net.sf.json.JSONArray and net.sf.json.JSONObject

<dependency>
   <groupId>net.sf.json-lib</groupId>
   <artifactId>json-lib</artifactId>
   <version>2.4</version>
   <classifier>jdk15</classifier>
</dependency>
　　

String str = "[{name:'a',value:'aa'},{name:'b',value:'bb'},{name:'c',value:'cc'},{name:'d',value:'dd'}]" ;// an unconverted string

JSONArray json = JSONArray.fromObject(str ); // 首先把字符串转成 JSONArray  对象
if(json.size()>0){
    
    
  for(int i=0;i<json.size();i++){
    
    
    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("name")+"=") ;  // 得到 每个对象中的属性值
  }
}

Front-end page json array converted to string

var contracts = [
   {
    
    id: '1', name: 'yanggb合同1'},
   {
    
    id: '2', name: 'yanggb合同2'},
   {
    
    id: '3', name: 'yanggb合同3'},
   {
    
    id: '4', name: 'yanggb合同4'},
   {
    
    id: '5', name: 'yanggb合同5'}
];

The JSON.stringify() method converts the array to a JSON array string
JSON.parse() method parses the JSON string into a json object

$.ajax({
    
    
    type: 'post',
    url: 'contract\save',
    data: {
    
    contracts: JSON.stringify(contracts)},
    success: function() {
    
    
        console.log('保存合同成功！');
    }
});

@PostMapping(value = "/contract/save")
@ResponseBody
public void saveContracts(String contracts) {
    
    
    List<Contract> contractList = JSON.parseArray(contracts, Contract.class);
    // 保存操作
}

Encapsulated into json data

function demo(){
    
    
  var con = {
    
    };
  con["id"] = 0;
  con["name"] = '张三';
  con["job"] = '学生';
  var json = JSON.stringify(con);          
  alert("封装成json数据为："+json);  
}

最终结果为：{
    
    "id":0,"name":"张三","job":"学生"}

Encapsulated as json array

function arr(){
    
    
  //定义一个数组 
  var cons = new Array(3); 
  for(var i = 0;i<3;i++){
    
    
    var con = {
    
    };
    con["id"] = 0;
    con["name"] = '张三';
    con["job"] = '学生';
    cons[i] = con;
  }
  var json = JSON.stringify(cons);
  alert("json数组为："+json); 
}
  最终结果为：[{
    
    "id":0,"name":"张三","job":"学生"},{
    
    "id":0,"name":"张三","job":"学生"},{
    
    "id":0,"name":"张三","job":"学生"}]

map to entity

  <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.70</version>
        </dependency>

 Map<String,Object> map=new HashMap<>();
 map.put("hotId","dfasfaf454af");
 map.put("hotName","小明");
 map.put("hotKey","5464132645");
 map.put("isDelete","1");
 map.put("hotStatus","0");
 String mapString = JSONObject.toJSONString(map);
 Hop hop = JSONObject.parseObject(mapString, Hop.class);
 System.out.println(hop.toString());