Export All fields with Field Label API Name and DataType of an Selected Sobject

Below code will  help you to select one sObject and by clicking on get fields button ,it will display
field level and API name and the data type of it .

By clicking on the link you can export detail into an excel sheet .


public class FetchSelectedObjectFields {
    public String selectedObject {get; set;}
    public List <InrPair> InrField {get; set;}
    public List <SelectOption> objectNames {get; set;}
    public Boolean showTable {get; set;}
    public Boolean showButton {get; set;}
    public Boolean displayPB2 {get; set;}
    public Map <String, Schema.SObjectType> schemaMap = Schema.getGlobalDescribe();
    public FetchSelectedObjectFields() {
        objectNames = initObjNames();
        InrField = new List<InrPair>();
        showTable = false;
        showButton = false;
        displayPB2 = false;
    }
    private List<SelectOption> initObjNames() {
        List<SelectOption> objNames = new List<SelectOption>();
        objNames.add(new SelectOption('blank', '--Select Object--'));
        List<Schema.SobjectType> obj = Schema.getGlobalDescribe().Values();
        for(Schema.SobjectType ss:obj) {
            objNames.add(new SelectOption(ss.getDescribe().getName(), ss.getDescribe().getName()));
            objNames.sort();
        }
        return objNames;
    }
   // Find the InrField for the selected object
    public void showFields() {
       InrField.clear();
       if(selectedObject != 'blank') {
            Map <String, Schema.SObjectField> fieldMap = schemaMap.get(selectedObject).getDescribe().fields.getMap();
           
            for(Schema.SObjectField sfield : fieldMap.Values()) {
                schema.DescribeFieldResult dfield = sfield.getDescribe();
                    InrPair fld = new InrPair();
                    fld.key = dfield.getName();
                    fld.val = dfield.getLabel();
                    fld.type = string.valueof(dfield.getType());
                    InrField.add(fld);
            }
            showTable = true;
            showButton = true;
            displayPB2 = true;
         }
         else {
            showTable = false;
            showButton = false;
            displayPB2 = false;
         }
    }
    public PageReference exportData() {
        PageReference pf = new PageReference('/apex/fetchObjData');
        pf.getParameters().put('objVal', selectedObject);
        pf.setRedirect(true);
        return pf;
    }   
    public class InrPair {
        public String key {get; set;}
        public String val {get; set;}
        public string type {get; set;}
    }
}
///////////////////////////////////////
<apex:page controller="FetchSelectedObjectFields" sidebar="false" >
 <apex:form >
  <apex:pageBlock id="pb1" >
   <apex:outputLabel ><b>Objects :</b></apex:outputLabel>&nbsp;
   <apex:selectList value="{!selectedObject}" size="1">
    <apex:actionSupport event="onchange"  reRender="detail"/>
    <apex:selectOption itemLabel="--Select Object--" itemValue="blank" />
    <apex:selectOptions value="{!objectNames}"/>
   </apex:selectList>&nbsp;&nbsp;&nbsp;
    <apex:commandButton value="Get Fields" action="{!showFields}" reRender="pb2"  status="fetchStatus" />&nbsp;  
     <apex:actionStatus id="fetchStatus" >
    <apex:facet name="start">
     <img src="/img/loading.gif" class="waitingImage" title="Please Wait..."/>
    </apex:facet>
   </apex:actionStatus>
  </apex:pageBlock>
  
  <apex:pageBlock id="pb2" > 
  <apex:outputPanel rendered="{!displayPB2}" >
   <apex:commandLink value="Export To Excel" action="{!exportData}" rendered="{!showButton}" target="_blank" style="font-weight:bold; font-size:15px; color:red" /> <br/><br/>
   <apex:pageBlockTable value="{!InrField}" var="fls" rendered="{!showTable}" >
    <apex:column headerValue="Field Value" value="{!fls.val}" />
    <apex:column headerValue="Field Name" value="{!fls.key}" />
    <apex:column headerValue="Field Type" value="{!fls.type}" />               
   </apex:pageBlockTable>    <br/><br/>
   </apex:outputPanel>
  </apex:pageBlock> 
 </apex:form>
</apex:page>
/////////////////////////////////////////////////
public class ExportFieldDetailInExcel {
    public List<InrPair> InrField {get; set;}
    public string str;
    public Map <String, Schema.SObjectType> schemaMap = Schema.getGlobalDescribe();
   
    public ExportFieldDetailInExcel() {
        str = ApexPages.CurrentPage().getParameters().get('objVal');
        try{
            InrField = new List<InrPair>();
            if(str != 'blank') {
                Map <String, Schema.SObjectField> fieldMap = schemaMap.get(str).getDescribe().fields.getMap();
                for(Schema.SObjectField sfield : fieldMap.Values()) {
                    schema.DescribeFieldResult dfield = sfield.getDescribe();
                    InrPair fld = new InrPair();
                    fld.key = dfield.getName();
                    fld.val = dfield.getLabel();
                    fld.type = string.valueof(dfield.getType());
                    InrField.add(fld);
                }       
            }
         }catch(Exception e) {}  
    }
    public class InrPair {
        public String key {get; set;}
        public String val {get; set;}
        public string type {get; set;}
    }
}
/////////////////////////////////////////////////////
<apex:page controller="ExportFieldDetailInExcel" contentType="application/vnd.ms-excel#{!$CurrentPage.Parameters.objVal}.xls" cache="true" standardStylesheets="false"  sidebar="false" showHeader="false" >
    <apex:pageBlock >
        <apex:dataTable value="{!InrField}" var="fls"  >
            <apex:column headerValue="Field Value" value="{!fls.val}" />
            <apex:column headerValue="Field Name" value="{!fls.key}" />
            <apex:column headerValue="Field Type" value="{!fls.type}" />               
        </apex:dataTable>    
    </apex:pageBlock>
</apex:page>