方式1
String s = "床前明月光，\n" +
"疑是地上霜。\n" +
"举头望明月，\n" +
"低头思故乡。";
System.out.println(s);
方式2
StringBuilder sb = new StringBuilder();
sb.append("床前明月光，\n");
sb.append("疑是地上霜。\n");
sb.append("举头望明月，\n");
sb.append("低头思故乡。");
System.out.println(sb.toString());
或者：
StringBuilder sb = new StringBuilder();
sb.append("床前明月光，\n")
.append("疑是地上霜。\n")
.append("举头望明月，\n")
.append("低头思故乡。");
System.out.println(sb.toString());
方式3
public static String join(String delimiter, String ...elements) {
if (elements.length == 0) {
return null;
} else if (elements.length == 1) {
return elements[0];
} else {
StringBuilder sb = new StringBuilder(1024);
for (int i=0; i < elements.length; ++i) {
if (i < elements.length-1) {
sb.append(elements[i]).append(delimiter);
} else {
sb.append(elements[i]);
}
}
return sb.toString();
}
}
public static String multiLines(String ...lines) {
return join("\n", lines);
}
@Test
public void test() {
String s = multiLines(
"床前明月光，",
"疑是地上霜。",
"举头望明月，",
"低头思故乡。"
);
System.out.println(s);
}
方式4
将文本写入src/main/resources/constant/jingyesi.txt：
床前明月光，
疑是地上霜。
举头望明月，
低头思故乡。
代码：
public String readResource(String path) throws IOException {
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
// 符合要求的文件可能不止一个
Enumeration<URL> configs = ClassLoader.getSystemResources(path);
List<URL> urlList = new ArrayList<>();
while(configs.hasMoreElements()) {
URL url = configs.nextElement();
urlList.add(url);
}
if (urlList.size() != 1) {
throw new IOException("文件不存在，或者存在重复文件");
}
InputStream in = urlList.get(0).openStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in, "utf-8"));
StringBuilder sb = new StringBuilder();
while(true) {
String line = reader.readLine();
if (line != null) {
sb.append(line).append("\n");
} else {
break;
}
}
return sb.toString();
}
@Test
public void test() throws IOException {
System.out.println(readResource("constant/jingyesi.txt"));
}