使用Hutool解析模板字符串
要求:使用 {varName} 占位
评价:如果paramMap中含有大量无用键值时不推荐使用这种方式
- 引入依赖:
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.4.1</version>
</dependency>
- 代码示例:
String template = "My name is {name}, I'm {age} years old. How old are you?";
Map<String, Object> paramMap = Maps.newHashMap();
paramMap.put("name", "林曦");
paramMap.put("age", 30);
String result = StrUtil.format(template, paramMap);
System.out.println("== Hutool处理结果 ==");
System.out.println(result);
使用commons-text解析模板字符串
要求:使用 ${varName} 占位
- 引入依赖:
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-text</artifactId>
<version>1.9</version>
</dependency>
- 代码示例:
String template = "My name is ${name}, I'm ${age} years old. How old are you?";
Map<String, Object> paramMap = Maps.newHashMap();
paramMap.put("name", "林曦");
paramMap.put("age", 30);
StringSubstitutor stringSubstitutor = new StringSubstitutor(paramMap);
String result = stringSubstitutor.replace(template);
System.out.println("== commons-text处理结果 ==");
System.out.println(result);
使用自定义方法解析模板字符串
要求:使用 ${varName} 占位
- 自定义解析方法
public static String format(String template, Map<String, Object> paramMap) {
Matcher matcher = Pattern.compile("\$\{\w+\}").matcher(template);
StringBuffer sb = new StringBuffer();
while (matcher.find()) {
String group = matcher.group();
String paramKey = group.substring(2, group.length() - 1);
Object value = paramMap.get(paramKey);
matcher.appendReplacement(sb, Objects.isNull(value) ? "" : value.toString());
}
matcher.appendTail(sb);
return sb.toString();
}
- 代码示例:
String template = "My name is ${name}, I'm ${age} years old. How old are you?";
Map<String, Object> paramMap = Maps.newHashMap();
paramMap.put("name", "林曦");
paramMap.put("age", 30);
String result = format(template, paramMap);
System.out.println("== 自定义format方法处理结果 ==");
System.out.println(result);