public class Calloutcontroller1 {
public List<consolewrap1> ConsoleWrapperList{get;set;}
public List<consolewrap1> getperformcallout(){
    ConsoleWrapperList = new List<consolewrap1>();
    HttpRequest req = new HttpRequest();
    HttpResponse res = new HttpResponse();
    Http http = new Http();
    req.setEndpoint('http://************************/sap/opu/odata/SAP/ZORDERS_INFO_SRV/ZORDERN_ETSet');
    req.setMethod('GET');

    String username = '******';
    String password = '*********';

    Blob headerValue = Blob.valueOf(username + ':' + password);
    String authorizationHeader = 'BASIC ' + EncodingUtil.base64Encode(headerValue);
    req.setHeader('Authorization', authorizationHeader);
    req.setHeader('x-csrf-token', 'Fetch');
    req.setHeader('Accept', 'application/json');

    res = http.send(req);

    if(res.getstatusCode() == 200 && res.getbody() != null){
        ConsoleWrapperList=(List<consolewrap1>)json.deserialize(res.getbody(),List<consolewrap1>.class);
    }
    return consolewrapperlist;
}

<apex:page controller="Calloutcontroller1" title="JSON table" >
<apex:form >
    <apex:pageBlock >
      <apex:pageBlockTable value="{!performcallout}" var="wrap" width="100%">
            <apex:column headerValue="Order" value="{!wrap.Orderid}"/>
            <apex:column headerValue="Customer" value="{!wrap.Customerid}"/>

            <apex:column headerValue="Ship via" value="{!wrap.Shipvia}"/>
            <apex:column headerValue="Ship Name" value="{!wrap.Shipname}"/>
            <apex:column headerValue="Ship Address" value="{!wrap.Shipaddress}"/>
            <apex:column headerValue="Ship City" value="{!wrap.Shipcity}"/>
            <apex:column headerValue="Ship Region" value="{!wrap.Shipregion}"/>

            <apex:column headerValue="Returnprd Code" value="{!wrap.Returnprdcode}"/>
            <apex:column headerValue="Returnprd Qty" value="{!wrap.Returnprdqty}"/>
            <apex:column headerValue="Replaceprd Code" value="{!wrap.Replaceprdcode}"/>
            <apex:column headerValue="Replaceprd Qty" value="{!wrap.Replaceprdqty}"/>
        </apex:pageBlockTable>
    </apex:pageBlock>
</apex:form>

public class Consolewrap1 {
public String Orderid{get;set;}
public String Customerid{get;set;}

public String Shipvia{get;set;}
public String Shipname{get;set;}
public String Shipaddress{get;set;}
public String Shipcity{get;set;}
public String Shipregion{get;set;}

public String Returnprdcode{get;set;}
public String Returnprdqty{get;set;}
public String Replaceprdcode{get;set;}
public String Replaceprdqty{get;set;}