Model transformation of form and Ajax submission data in Javaweb development

Model transformation of form and Ajax submission data in Javaweb development

Recently learning the MongoDB database, as Java development, I certainly need to do a small Web application to test. In HTML I take AJAX submissions because I want to emulate various types of data, underlying data types, arrays, objects, and so on. Eventually, however, a different place was found: form and Ajax commit data, altogether parameter names differ in HttpServletRequest.

Data Type	form	Ajax
Basic data	Para=value	Para=value
Array	para[]={"AAA", "BBB"}	para[][]={"AAA", "BBB"}
Object	Obj.sex= (as with the basic data, just use obj.)	obj[sex]= Women
Object array	Obj[0].sex	obj[0][sex]= Women

The form submission, above the parameter method, needs to be defined in input's name attribute, commonly used is SPRINGMVC data binding; Ajax commits, parameters are derived from the properties of the object submitted by data.

$.ajax ({type:"POST", DataType:"JSON"Url:"${ctx}/api/manage/save", data: {test: [' AaB ',' BBB ',' CCC '], table:' TableName ', fields: [{' field ':' F ',' type ':' t ',' desc ':' d '},                {' field ':' F1 ',' type ':' T1 ',' desc ':' D1 ']}). Success ( function(data) {alert (data.msg);});

As above, it is an AJAX submission.

Solve

Found the difference, the beginning is nothing. But at the time of submission, getting the data and parsing is sometimes a bit of a hassle, that is, the framework of spring can be perfectly supported, but it should be understood. So I'm not going to see the spring principle, I'm going to faint.
In order to solve this problem completely, I wrote a class by myself, using recursive method. Down to analyze the next

1. First you need a way to get t through the parameters, as follows

public  static  <T> T getmodel  (map<string, string[]> Map, Class<t> clazz) {map<string, object> jsonmap = new  HashMap<String, Ob    Ject> (); for  (String Key:map.keySet ())        {string[] values = Map.get (key);        //$.ajax submit data:{arr:[' AAA ', ' BBB ']}, here key is arr[][]  if  (Key.endswith ( "[]" )) key = Key.substring (0 , K        Ey.length ()-2 );    Parsekey (key, values, Clazz, jsonmap); } return  json.parseobject (json.tojsonstring (Jsonmap), clazz);}  

There are two points in this method:
1, Ajax commit array [], need to remove a hold key consistency
2. Convert map to T object, here is conversion by Fastjson (now convert map to JSON, then json back to T, because direct conversion is a bit difficult)

Parsekey method

Private Static void Parsekey(String key, string[] values, class<?> clazz, map<string, object> Jsonmap) {if(Hassubclass (key)) {//objects for arrays or objectsString field = key.substring (0, Key.indexof ("[")); String Classfield ="";if(Key.contains (".")) {//Convert. Unification in form to [] to operateKey = Key.replace ("].", pattern). Replace (".", pattern); Key = key +"]"; }if(Key.indexof (pattern)! = Key.lastindexof (pattern)) {//May be an array objectClassfield = key.substring (Key.indexof (pattern) +2, Key.length ()). Replacefirst ("]",""); }Else{Classfield = key.substring (Key.indexof (pattern) +2, Key.length ()-1); }if(jsonmap.get (field) = =NULL) {Jsonmap.put (field,NewArraylist<map<string, object>> ()); } list<map<string, object>> list = (list) jsonmap.get (field);inti = Integer.parseint (key.substring (field.length () +1, Field.length () +2)) +1; for(intj =0; J < I; J + +) {Try{List.get (j);Continue; }Catch(Exception e) {List.add (J,NewHashmap<string, object> ()); }} class<?> Subclass =NULL;Try{Parameterizedtype cl = (parameterizedtype) clazz. Getdeclaredfield (field). Getgenerictype ()            ; Subclass = (class<?>) cl.getactualtypearguments () [0]; Parsekey (Classfield, values, subclass, List.get (i-1)); }Catch(Nosuchfieldexception e)        {E.printstacktrace (); }Catch(SecurityException e)        {E.printstacktrace (); }    }Else{//Basic data or objects        Try{Load (key, values, Clazz, jsonmap); }Catch(Exception e)        {E.printstacktrace (); }    }}

This method is mainly based on the parameters of the rules, and then determine the type of data, and then the corresponding conversion, the inside with recursion, reason everyone should know, I will not say more.

At last

This is probably the way of thinking: judging parameters + reflections, reflecting the accuracy of the data.
Final version: Download

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Model transformation of form and Ajax submission data in Javaweb development