Tool class for encapsulating request parameters using the Getparametermap () method

We know that the GetParameter (name) of the HttpServletRequest class, Getparametervalues (name), can implement individual arguments to the page and accept multiple parameters of the same name, respectively. In particular getparameter (name) This method is used more often. Sometimes the page comes with multiple parameters, to write more than one request.getparameter (name) to accept, of course, under the SPRINGMVC framework you can choose to use the object to accept parameters, you can also on the method to receive the parameters individually. The downside to this is that you need to create different objects that accept parameters, or accept them on your method (the code looks ugly if you have multiple arguments), in the case of requests for parameters and name changes. The purpose of this article is to use HttpServletRequest's Getparametermap () method to encapsulate the request parameters, directly below the code.

1 ImportJava.util.HashMap;2 ImportJava.util.Iterator;3 ImportJava.util.Map;4 ImportJava.util.Map.Entry;5 6 Importjavax.servlet.http.HttpServletRequest;7 8  Public classRequestparamstomap {9The return value type is map<string, object>Ten      Public StaticMap<string, object>Getparametermap (HttpServletRequest request) { OneMap<string, string[]> properties =Request.getparametermap ();//Package request parameters into Map<string, string[]> Amap<string, object> returnmap =NewHashmap<string, object>(); -Iterator<entry<string, string[]>> iter =Properties.entryset (). iterator (); -String name = ""; theString value = ""; -          while(Iter.hasnext ()) { -entry<string, string[]> Entry =Iter.next (); -Name =Entry.getkey (); +Object valueobj =Entry.getvalue (); -             if(NULL==valueobj) { +Value = ""; A}Else if(Valueobjinstanceofstring[]) { atString[] values =(string[]) valueobj; -                  for(inti = 0; i < values.length; i++{//For multiple identical names in request parameters -Value = Values[i] + ","; -                 } -Value = value.substring (0, Value.length ()-1); -}Else { inValue =valueobj.tostring ();// used to request parameter names unique in request parameters  -             } to returnmap.put (name, value); +         } -         returnReturnmap; the     } *The return value type is map<string, string> $      Public StaticMap<string, string>Getparameterstringmap (HttpServletRequest request) {Panax NotoginsengMap<string, string[]> properties =Request.getparametermap (); //Package request parameters into Map<string, string[]>  -map<string, string> returnmap =NewHashmap<string, string>(); theString name = ""; +String value = ""; A          for(Map.entry<string, string[]>Entry:properties.entrySet ()) { theName =Entry.getkey (); +String[] values =Entry.getvalue (); -             if(NULL==values) { $Value = ""; $}Else if(values.length>1) { -                  for(inti = 0; i < values.length; i++{ //For multiple identical names in request parameters  -Value = Values[i] + ","; the                 } -Value = value.substring (0, Value.length ()-1);Wuyi}Else { theValue = Values[0]; // used to request parameter names unique in request parameters   -             } Wu returnmap.put (name, value); -              About         } $         returnReturnmap; -     } -      -}

The code is so much, of course, if you want to convert the resulting map collection into a Bean object, you can use the import Org.apache.commons.beanutils.BeanUtils; class Beanutils.populate (Bean, map ) method to convert the map to the bean, which is automatically matched based on the key value of the map and the attributes of the Bean object (at this point, the first method is recommended).

Tool class for encapsulating request parameters using the Getparametermap () method