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Advanced PNG Conversion Options | Java
Main.java:
J#
package com.company; import com.google.gson.JsonArray; import com.google.gson.JsonElement; import com.google.gson.JsonObject; import com.google.gson.JsonParser; import okhttp3.*; import java.io.*; import java.net.*; import java.nio.file.Paths; /* The following options are available through profiles: (JSON can be single/double-quoted and contain comments.) { "profiles": [ { "profile1": { "TextSmoothingMode": "HighQuality", // Valid values: "HighSpeed", "HighQuality" "VectorSmoothingMode": "HighQuality", // Valid values: "HighSpeed", "HighQuality" "ImageInterpolationMode": "HighQuality", // Valid values: "HighSpeed", "HighQuality" "RenderTextObjects": true, // Valid values: true, false "RenderVectorObjects": true, // Valid values: true, false "RenderImageObjects": true, // Valid values: true, false "RenderCurveVectorObjects": true, // Valid values: true, false "JPEGQuality": 85, // from 0 (lowest) to 100 (highest) "TIFFCompression": "LZW", // Valid values: "None", "LZW", "CCITT3", "CCITT4", "RLE" "RotateFlipType": "RotateNoneFlipNone", // RotateFlipType enum values from here: https://docs.microsoft.com/en-us/dotnet/api/system.drawing.rotatefliptype?view=netframework-2.0 "ImageBitsPerPixel": "BPP24", // Valid values: "BPP1", "BPP8", "BPP24", "BPP32" "OneBitConversionAlgorithm": "OtsuThreshold", // Valid values: "OtsuThreshold", "BayerOrderedDithering" "FontHintingMode": "Default", // Valid values: "Default", "Stronger" "NightMode": false // Valid values: true, false } } ] }*/ public class Main { // The authentication key (API Key). // Get your own by registering at https://app.pdf.co/documentation/api final static String API_KEY = "***********************************"; // Source PDF file final static String SourceFileUrl = "https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/pdf-to-image/sample.pdf"; // Comma-separated list of page numbers (or ranges) to process. Leave empty for all pages. Example: '1,3-5,7-'. final static String Pages = "1-2,3-"; // PDF document password. Leave empty for unprotected documents. final static String Password = ""; // Advanced optinos final static String Profiles = "{ 'profiles': [ { 'profile1': { 'ImageBitsPerPixel': 'BPP1' } } ] }"; public static void main(String[] args) throws IOException { // Create HTTP client instance OkHttpClient webClient = new OkHttpClient(); // Prepare URL for `PDF To PNG` API call String query = "https://api.pdf.co/v1/pdf/convert/to/png"; // Make correctly escaped (encoded) URL URL url = null; try { url = new URI(null, query, null).toURL(); } catch (URISyntaxException e) { e.printStackTrace(); } // Create JSON payload String jsonPayload = String.format("{\"password\": \"%s\", \"pages\": \"%s\", \"url\": \"%s\", \"profiles\": \"%s\"}", Password, Pages, SourceFileUrl, Profiles); // Prepare request body RequestBody body = RequestBody.create(MediaType.parse("application/json"), jsonPayload); // Prepare request Request request = new Request.Builder() .url(url) .addHeader("x-api-key", API_KEY) // (!) Set API Key .addHeader("Content-Type", "application/json") .post(body) .build(); // Execute request Response response = webClient.newCall(request).execute(); if (response.code() == 200) { // Parse JSON response JsonObject json = new JsonParser().parse(response.body().string()).getAsJsonObject(); boolean error = json.get("error").getAsBoolean(); if (!error) { // Download generated PNG files JsonArray urls = json.get("urls").getAsJsonArray(); int page = 1; for (JsonElement element: urls) { String resultFileUrl = element.getAsString(); String localFileName = String.format(".\\page%s.png", page); downloadFile(webClient, resultFileUrl, Paths.get(localFileName).toFile()); System.out.println(String.format("Downloaded \"%s\".", localFileName)); page++; } } else { // Display service reported error System.out.println(json.get("message").getAsString()); } } else { // Display request error System.out.println(response.code() + " " + response.message()); } } public static void downloadFile(OkHttpClient webClient, String url, File destinationFile) throws IOException { // Prepare request Request request = new Request.Builder() .url(url) .build(); // Execute request Response response = webClient.newCall(request).execute(); byte[] fileBytes = response.body().bytes(); // Save downloaded bytes to file OutputStream output = new FileOutputStream(destinationFile); output.write(fileBytes); output.flush(); output.close(); response.close(); } }