Document writing to console

- Relates #579

spring-shell-samples/src/main/java/org/springframework/shell/samples/e2e/WriteCommands.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.shell.samples.e2e;
+
+import java.util.function.Supplier;
+
+import org.jline.terminal.Terminal;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.shell.command.CommandRegistration;
+import org.springframework.shell.standard.ShellComponent;
+import org.springframework.shell.standard.ShellMethod;
+
+@ShellComponent
+public class WriteCommands extends BaseE2ECommands {
+
+	@Autowired
+	Terminal terminal;
+
+	@Bean
+	public CommandRegistration writeTerminalWriterRegistration(Supplier<CommandRegistration.Builder> builder) {
+		return builder.get()
+			.command(REG, "write-terminalwriter")
+			.group(GROUP)
+			.withTarget()
+				.consumer(ctx -> {
+					ctx.getTerminal().writer().println("hi");
+					ctx.getTerminal().writer().flush();
+				})
+				.and()
+			.build();
+	}
+
+	@ShellMethod(key = LEGACY_ANNO + "write-terminalwriter", group = GROUP)
+	public void writeTerminalWriterAnnotation() {
+		terminal.writer().println("hi");
+		terminal.writer().flush();
+	}
+
+	@Bean
+	public CommandRegistration writeSystemOutRegistration(Supplier<CommandRegistration.Builder> builder) {
+		return builder.get()
+			.command(REG, "write-terminalwriter")
+			.group(GROUP)
+			.withTarget()
+				.consumer(ctx -> {
+					System.out.println("hi");
+				})
+				.and()
+			.build();
+	}
+
+	@ShellMethod(key = LEGACY_ANNO + "write-systemout", group = GROUP)
+	public void writeSystemOutAnnotation() {
+		System.out.println("hi");
+	}
+}