Passing object array from jsp to java servlet using JSON

Question

the following codes are what i'm trying to figure out.Hope you guys can help me !

jsp :

<input name="test" type="text" /><br/>
<input name="test" type="text" /><br/>
<input name="test" type="text" /><br/>
<input id="query" type="button" value="query" onClick="doajax()"/>

js :

function doajax(){
    var dataSet = $("input[type='text'][name='test']").serializeArray();

    $.ajax({
            type: "post",
            url: "<%=request.getContextPath()%>/testJson",
            dataType: "json",
            data:dataSet,
            error:function(){   
                alert("error occured!!!");   
            },
            success:function(data){
                alert("success");
            }  
    });
}

* [Update] *

I'm using Struts 2.0. I usually get the parameters by " get and set " instead of request.getParameters().

How can i get the dataSet in Java Servlet ?

Thank you for reading !

rene · Accepted Answer · 2012-01-03 13:12:36Z

you can try this example for getting it right :-

first pass name and age to onclick event through getUserDetails() method in js file from jsp then

  function getUserDetails() {      
       var name = document.getElementById('name');      
       var age = document.getElementById('age');

       // alert("hi " + name.value);
   $.getJSON("../webresources/myresource",
           {
                    name: name.value,
                    age: age.value
                },
                function(json) {

                    alert("name is= "+json.name+ " and age is ="+json.age);

                });
   }

and in servlet it should be like below :-

public class MyResource {

  @GET
  @Produces("application/json; charset=UTF-8")
  public Response getIt(
        @QueryParam("name") String name,
        @QueryParam("age") String age) {

    Person person = new Person();
    person.setName(name);
    person.setAge(Integer.parseInt(age));

//  Person persons = personService.findPerson(person);
    String temp1 = person.getName();
    int temp = person.getAge();
    String temp2 = Integer.toString(temp);

    StringBuffer buffer = new StringBuffer();

    buffer.append(" { 'name':'");
    buffer.append(temp1);
    buffer.append(" ','age': ");
    buffer.append(temp2);
    buffer.append(" } ");
    String json = buffer.toString();

        // for example constructed string looks like
      // String json = "{'name':'ravi','age':21}";

    return Response.ok(json, MediaType.APPLICATION_JSON).build();

}

Bozho · Accepted Answer · 2010-11-09 07:40:00Z

dataSet is a regular POST parameter, so get it the regular way.

Then use a JSON library like Jackson or gson to transform the JSON to an object. You'll need to define the structure as a class, however. So, if you have a DataSet class that maps exactly to the json you sent, you can fill it with (Jackson):

ObjectMapper mapper = new ObjectMapper();
DataSet object = mapper.readValue(dataSet, DataSet.class);

Then if you want to send some JSON ase response, either convert the response data and write it to the response.getWriter(), or if the library allows this, write the output directly to the writer.

Jackson for example has writeValue(writer, object). So in a servlet:

ObjectMapper mapper = new ObjectMapper();
mapper.writeValue(response.getWriter(), yourData);

response.setContentType("application/json");

KishoreK · Accepted Answer · 2010-11-09 06:40:45Z

0

Use request.getParameterMap() and display all the request parameters. You may find your desired parameter there.

answered Nov 9, 2010 at 6:40

KishoreK

9626 silver badges14 bronze badges

Collectives™ on Stack Overflow

Passing object array from jsp to java servlet using JSON

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related