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Editorial Team
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Asked: 2026-06-15T16:10:33+00:00

I am planning to use, excel to pdf api (REST) in my java code

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I am planning to use, excel to pdf api (REST) in my java code provided by ConvertApi.
please share the code snippet to be used for the same.

Thanks in advance.

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1 Answer

  1. Editorial Team

    Please try the code below

    Library

    package com.excel2pdfconvert.example;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.DefaultHttpClient;

public class Xls2PDFConvertBean {

    private File file;
    private String outputDir;
    
    
    private String filesize;
    private String filename;
    
    
    
    public void setOutputDir(String outputDir) {
        this.outputDir = outputDir;
    }
    public void setExcelFile(File file) {
        this.file = file;
    }
    
    public String getFilesize() {
        return filesize;
    }
    public String getFilename() {
        return filename;
    }
    
    
    /**
     * Run request for page conversion
     * @return resultcode "0" in error, "1" in success
     * @throws UnsupportedEncodingException 
     */
    public String doRequest() throws UnsupportedEncodingException{
        
        String resultcode = "0"; 
        
        HttpPost httppost = new HttpPost("https://v2.convertapi.com/convert/xlsx/to/pdf");
        
        MultipartEntity entity = new MultipartEntity( HttpMultipartMode.BROWSER_COMPATIBLE );
        
        // For File parameters
        entity.addPart("file", new FileBody(file, "binary/octet-stream"));
        
        httppost.setEntity( entity );
        
        HttpClient httpclient = new DefaultHttpClient();
        try {
            HttpResponse response = httpclient.execute(httppost);
            Header rcHeader = response.getFirstHeader("result");
            if(rcHeader != null){
                
                resultcode = rcHeader.getValue();
                
                if("True".equals(resultcode)){
                    
                    filesize = response.getFirstHeader("filesize").getValue();
                    filename = response.getFirstHeader("OutputFileName").getValue();
                    
                    HttpEntity hentity = response.getEntity();
                    if(hentity != null){

                        InputStream istream = hentity.getContent();
                        File file = new File(outputDir+File.separator+filename);
                        FileOutputStream ostream = new FileOutputStream(file);
                        
                        byte[] b = new byte[1024];
                        int num = 0;
                        while( (num = istream.read(b, 0, b.length)) > 0)
                            ostream.write(b, 0, num);
                        istream.close();
                        ostream.flush();
                        ostream.close();
                        
                    }
                }
            }
            
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        
        return resultcode;
    }
    
}

    The web page

    <%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ page import="com.excel2pdfconvert.example.Xls2PDFConvertBean" %>
<%@ page import="org.apache.commons.fileupload.servlet.ServletFileUpload" %>
<%@ page import="org.apache.commons.fileupload.disk.DiskFileItemFactory" %>
<%@ page import="java.util.*" %>
<%@ page import="java.io.File" %>
<%@ page import="org.apache.commons.fileupload.FileItem" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head><title>
    Excel2Pdf Api Demo
</title>
    <script type="text/javascript">
        function BeforeConvert() {
            document.getElementById('LabelMessage').innerHTML = 'Please wait...';
            document.getElementById('HyperLinkFile').innerHTML = '';
            document.getElementById('LabelFileSize').innerHTML = '';
            document.getElementById('LabelFileName').innerHTML = '';
        }
    </script> 
</head>
<body>

<form method="post" enctype="multipart/form-data">

    <div>
        <h1>Excel2Pdf Api Demo</h1>
        Upload Excel file:&nbsp;
        <input type="file" name="excel" />&nbsp;
        <input type="submit" name="btnConvert" value="Convert" onclick="BeforeConvert();" id="btnConvert" />
        <br />
        <br />
        
        
<% if(ServletFileUpload.isMultipartContent(request)){
    
    DiskFileItemFactory factory = new DiskFileItemFactory();
    ServletFileUpload upload = new ServletFileUpload(factory);
    List items = upload.parseRequest(request);
    
    File uploadedFile = null;
    String[] allowedExt = {"csv", "xls", "xlsx", "xlsb", "xlt", "xltx"};
    
    // Process the uploaded items
    Iterator iter = items.iterator();
    while (iter.hasNext()) {
        FileItem item = (FileItem) iter.next();

        if (! item.isFormField()) {
             
            //Check for valid excel extensions
            String fileName = item.getName();
            boolean isValid = false;
             for(String ext : allowedExt){
                 if(fileName.contains(ext)){
                    isValid = true;
                    break;
                 }
             }
             
             if(isValid){
                 uploadedFile = new File(application.getRealPath("/") + "/" + fileName);
                 item.write(uploadedFile);
             }
        }
    }

    if(uploadedFile == null){
        out.println("<div>Please upload file in following format: csv, xls, xlsx, xlsb, xlt, xltx");
    }else{
        
        Xls2PDFConvertBean xls2pdf = new Xls2PDFConvertBean();
        xls2pdf.setOutputDir(application.getRealPath("/"));
        xls2pdf.setExcelFile(uploadedFile);
        String resultcode = xls2pdf.doRequest();
        
        //Remove uploaded file after conversion
        uploadedFile.delete();
        
        if(resultcode == null || "False".equals(resultcode)){
            out.println("<div>Can not convert file</div>");
        }else{
%>
        <span id="LabelMessage">Conversion successful  </span>
        <br />
        <a id="HyperLinkFile" href="<%= xls2pdf.getFilename() %>" >Click here to open file  </a>

        <br />
        <span id="LabelFileSize">File size: <%= xls2pdf.getFilesize() %></span>
        <br />
        <span id="LabelFileName">File name: <%= xls2pdf.getFilename() %></span>
 <%
            }
        }
    }else{
%>
    <span id="LabelMessage"></span>
<%      
    }
%>


    </div>
</form>
   
</body>

</html>
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