Spel 表达式

public class SpElParser {

    private static final ExpressionParser parser = new SpelExpressionParser();

    public static String getKey(String key, String [] parameterNames, Object [] args) {
        Expression expression = parser.parseExpression(key);
        EvaluationContext context = new StandardEvaluationContext();
        if (args.length == 0) {
            return null;
        }
        for (int i = 0; i < args.length; i++) {
            context.setVariable(parameterNames[i], args[i]);
        }
        return expression.getValue(context, String.class);
    }

}

    public static String convert(String content, Map<String, String> paramMap) {
        if (!StringUtils.hasText(content) || CollectionUtils.isEmpty(paramMap)) {
            return content;
        }
        ExpressionParser parser = new SpelExpressionParser();
        TemplateParserContext parserContext = new TemplateParserContext();
        return parser
                .parseExpression(content, parserContext)
                .getValue(paramMap, String.class);
    }

    public static String convert(String content, String json) {
        if (!StringUtils.hasText(content) || !StringUtils.hasText(json)) {
            return content;
        }
        Map<String, String> paramMap = JacksonUtils.jsonObject(
                json,
                new TypeReference<Map<String, String>>() {
                }
        );
        return convert(content, paramMap);
    }

{
    "name":"张三"
}

String content = "#{[name]}";

String content = "#{'Hello, ' + [name] + '!'}"; 

String content = "#{[name1] != null ? 'Hello, ' + [name1] + '!' : ''}";