Use Files.writeString and Files.readString where possible

Author: rsvoboda

extensions/amazon-lambda/common-deployment/src/main/java/io/quarkus/amazon/lambda/deployment/LambdaUtil.java

@@ -47,7 +47,7 @@ public static void writeFile(OutputTargetBuildItem target, String name, String o
         output = output.replace("${artifactId}", target.getBaseName())
                 .replace("${buildDir}", target.getOutputDirectory().toString())
                 .replace("${targetUri}", targetUri);
-        Files.write(artifact, output.getBytes(StandardCharsets.UTF_8));
+        Files.writeString(artifact, output);
     }
 
     public static void writeExecutableFile(OutputTargetBuildItem target, String name, String output) throws IOException {

extensions/container-image/container-image-jib/deployment/src/main/java/io/quarkus/container/image/jib/deployment/JibProcessor.java

@@ -10,7 +10,6 @@
 
 import java.io.IOException;
 import java.io.UncheckedIOException;
-import java.nio.charset.StandardCharsets;
 import java.nio.file.DirectoryStream;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -341,7 +340,7 @@ private void doWriteOutputFile(OutputTargetBuildItem outputTarget, Path configPa
             configPath = outputTarget.getOutputDirectory().resolve(configPath);
         }
         try {
-            Files.write(configPath, output.getBytes(StandardCharsets.UTF_8));
+            Files.writeString(configPath, output);
         } catch (IOException e) {
             log.errorf(e, "Unable to write file '%s'.", configPath.toAbsolutePath().toString());
         }

extensions/resteasy-reactive/rest-client/deployment/src/test/java/io/quarkus/rest/client/reactive/multipart/MultipartDetectionTest.java

@@ -45,8 +45,7 @@ void shouldCallExplicitEndpoints() throws IOException {
         Client client = RestClientBuilder.newBuilder().baseUri(baseUri).build(Client.class);
 
         File file = File.createTempFile("MultipartTest", ".txt");
-        byte[] contents = "Hello".getBytes(StandardCharsets.UTF_8);
-        Files.write(file.toPath(), contents);
+        Files.writeString(file.toPath(), "Hello");
         file.deleteOnExit();
 
         assertThat(client.postMultipartExplicit(file.getName(), file))

extensions/resteasy-reactive/rest/deployment/src/test/java/io/quarkus/resteasy/reactive/server/test/multipart/LargerThanDefaultFormAttributeMultipartFormInputTest.java

@@ -5,7 +5,6 @@
 
 import java.io.File;
 import java.io.IOException;
-import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.util.function.Supplier;
 
@@ -48,7 +47,7 @@ public JavaArchive get() {
 
     @Test
     public void test() throws IOException {
-        String fileContents = new String(Files.readAllBytes(FILE.toPath()), StandardCharsets.UTF_8);
+        String fileContents = Files.readString(FILE.toPath());
         StringBuilder sb = new StringBuilder();
         for (int i = 0; i < 10; ++i) {
             sb.append(fileContents);

extensions/resteasy-reactive/rest/deployment/src/test/java/io/quarkus/resteasy/reactive/server/test/multipart/TooLargeFormAttributeMultipartFormInputTest.java

@@ -4,7 +4,6 @@
 
 import java.io.File;
 import java.io.IOException;
-import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.util.function.Supplier;
@@ -68,7 +67,7 @@ public void clearDirectory() {
 
     @Test
     public void test() throws IOException {
-        String fileContents = new String(Files.readAllBytes(FORM_ATTR_SOURCE_FILE.toPath()), StandardCharsets.UTF_8);
+        String fileContents = Files.readString(FORM_ATTR_SOURCE_FILE.toPath());
         StringBuilder sb = new StringBuilder();
         for (int i = 0; i < 10; ++i) {
             sb.append(fileContents);

extensions/vertx-http/deployment/src/main/java/io/quarkus/devui/deployment/DevUIProcessor.java

@@ -212,7 +212,7 @@ void registerDevUiHandlers(
                 String parsedContent = Qute.fmt(new String(c.getTemplate()), c.getData());
                 Path tempFile = devUiBasePath
                         .resolve(c.getFileName());
-                Files.write(tempFile, parsedContent.getBytes(StandardCharsets.UTF_8));
+                Files.writeString(tempFile, parsedContent);
 
                 urlAndPath.put(c.getFileName(), tempFile.toString());
             }

extensions/vertx-http/deployment/src/test/java/io/quarkus/vertx/http/accesslog/AccessLogFileTestCase.java

@@ -17,7 +17,6 @@
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
-import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.Properties;
@@ -119,7 +118,7 @@ public void run() throws Throwable {
                         }
                         Path path = logDirectory.resolve("server.log");
                         Assertions.assertTrue(Files.exists(path));
-                        String data = new String(Files.readAllBytes(path), StandardCharsets.UTF_8);
+                        String data = Files.readString(path);
                         Assertions.assertFalse(data.contains("/health"));
                         Assertions.assertFalse(data.contains("/liveliness"));
                         Assertions.assertTrue(data.contains("/does-not-exist"));