How to return an imported value from one JSP page to another?

Question

I have two JSP pages: in one it checks a condition of client links, if it has no link, it enters a function that calls another JSP to import client data.

He even imports the data but, when he returns the JSP that called him he does not immediately bring the data, I have to type again the client to see his data!

I want to know if there is any way when import and return to the previous JSP it already bring the data and fill in the fields automatically?

Follows part of the JSP code that calls the other JSP to import data

function setar(chave, campo, valorchave, valorcampo, vinculo) {
    if (vinculo == 'N'){
        document.getElementById(chave).value = valorchave;
        document.getElementById(campo).value = valorcampo;
        x.innerHTML = "";
        hide();

        if(campo=="nome")         {
           var jsquery = "<%= query%>";
           //Tira o paciente e coloca o escolhido
           jsquery = replaceParameter(jsquery, "codcli", valorchave);
           document.getElementById("frmcadastrar").action = displayPopup("ativapaciente.jsp?"+jsquery+ "&emp="+empresa,"ativapac",300,500);

        }
    }else{
        document.getElementById(chave).value = valorchave;
        document.getElementById(campo).value = valorcampo;
        x.innerHTML = "";
        hide();

        if(campo=="nome") {
            var jsquery = "<%= query%>";
            jsquery = replaceParameter(jsquery, "codcli",valorchave);
            document.getElementById("frmcadastrar").action = "detalheagenda.jsp?"+jsquery;
            document.getElementById("frmcadastrar").submit();
        }
    }
}

and here part of JSP that imports the data and returns to what called

function gravarPacienteAtivo(){
    if(document.getElementById("cpf").value != "" || document.getElementById("carteira").value != "" || document.getElementById("fone").value != "" ) {                                                               
        var salvar = document.getElementById("frmcadastrar");
        salvar.action+="?codcli="+cod_pac+"&cod_empresa="+empresa;
        salvar.submit();
    }else
        alert("Escolha e preencha uma das informações necessárias.");
    }
}

//função retorna a janela
function iniciar() {          
    if(inf == "1"){ 
        alert("Paciente ativado com sucesso.");
        //Abri a página que abriu esse jsp
        self.close();
        window.opener.location.reload(true);

    } else
        inicio();
    }
}